[packages/gmp.git] / gmp-cpu.patch

diff -urN gmp-6.0.0.org/configure.ac gmp-6.0.0/configure.ac
--- gmp-6.0.0.org/configure.ac  2014-03-25 15:37:55.000000000 +0100
+++ gmp-6.0.0/configure.ac      2014-03-26 20:43:38.290317434 +0100
@@ -281,8 +281,12 @@
   AC_MSG_ERROR([--enable-fake-cpuid requires --enable-fat])
 fi
 
-
-tmp_host=`echo $host_cpu | sed 's/\./_/'`
+AC_ARG_WITH(cpu,
+AC_HELP_STRING([--with-cpu],
+              [specify CPU type [[default=host_cpu]]]),
+[gmp_cpu=$withval], [gmp_cpu=$host_cpu])
+ 
+tmp_host=`echo $gmp_cpu | sed 's/\./_/'`
 AC_DEFINE_UNQUOTED(HAVE_HOST_CPU_$tmp_host)
 GMP_DEFINE_RAW("define_not_for_expansion(\`HAVE_HOST_CPU_$tmp_host')", POST)
 
@@ -460,7 +464,7 @@
 
   alpha*-*-*)
     AC_DEFINE(HAVE_HOST_CPU_FAMILY_alpha)
-    case $host_cpu in
+    case $gmp_cpu in
       alphaev5* | alphapca5*)
        path="alpha/ev5 alpha" ;;
       alphaev67 | alphaev68 | alphaev7*)
@@ -487,7 +491,7 @@
     # compiler errors too easily and is rejected by GMP_PROG_CC_WORKS.  Each
     # -mcpu=ev6 below has a fallback to -mcpu=ev56 for this reason.
     #
-    case $host_cpu in
+    case $gmp_cpu in
       alpha)        gcc_cflags_cpu="-mcpu=ev4" ;;
       alphaev5)     gcc_cflags_cpu="-mcpu=ev5" ;;
       alphaev56)    gcc_cflags_cpu="-mcpu=ev56" ;;
@@ -520,7 +524,7 @@
     # Insns like ctlz which were never available as macros are always
     # accepted and always generate their plain code.
     #
-    case $host_cpu in
+    case $gmp_cpu in
       alpha)        gcc_cflags_asm="-Wa,-arch,ev4 -Wa,-mev4" ;;
       alphaev5)     gcc_cflags_asm="-Wa,-arch,ev5 -Wa,-mev5" ;;
       alphaev56)    gcc_cflags_asm="-Wa,-arch,ev56 -Wa,-mev56" ;;
@@ -555,7 +559,7 @@
        # DEC C V5.9-005 knows ev4, ev5, ev56, pca56, ev6.
        # Compaq C V6.3-029 adds ev67.
        #
-       case $host_cpu in
+       case $gmp_cpu in
          alpha)       cc_cflags_cpu="-arch~ev4~-tune~ev4" ;;
          alphaev5)    cc_cflags_cpu="-arch~ev5~-tune~ev5" ;;
          alphaev56)   cc_cflags_cpu="-arch~ev56~-tune~ev56" ;;
@@ -612,7 +616,7 @@
     # FIXME: We make mandatory compiler options optional here.  We should
     # either enforce them, or organise to strip paths as the corresponding
     # options fail.
-    case $host_cpu in
+    case $gmp_cpu in
       armsa1 | arm9tdmi | armv4*)
        path="arm"
        gcc_cflags_arch="-march=armv4"
@@ -702,7 +706,7 @@
     # (Can't remember why this isn't done already, have to check what .asm
     # files are available in each and how they run on a typical 2.0 cpu.)
     #
-    case $host_cpu in
+    case $gmp_cpu in
       hppa1.0*)    path="pa32" ;;
       hppa7000*)   path="pa32/hppa1_1 pa32" ;;
       hppa2.0* | hppa64)
@@ -720,13 +724,13 @@
     # probably be safe, but let's not take the chance.  In any case, a
     # configuration like --host=hppa2.0 ABI=1.0 is far from optimal.
     #
-    case $host_cpu in
+    case $gmp_cpu in
       hppa1.0*)           gcc_cflags_arch="-mpa-risc-1-0" ;;
       *)                  # default to 7100
                           gcc_cflags_arch="-mpa-risc-1-1" ;;
     esac
 
-    case $host_cpu in
+    case $gmp_cpu in
       hppa1.0*)    cc_cflags="+O2" ;;
       *)           # default to 7100
                    cc_cflags="+DA1.1 +O2" ;;
@@ -788,7 +792,7 @@
     SPEED_CYCLECOUNTER_OBJ=ia64.lo
     any_32_testlist="sizeof-long-4"
 
-    case $host_cpu in
+    case $gmp_cpu in
       itanium)   path="ia64/itanium  ia64" ;;
       itanium2)  path="ia64/itanium2 ia64" ;;
       *)         path="ia64" ;;
@@ -798,7 +802,7 @@
     gcc_32_cflags_optlist=$gcc_64_cflags_optlist
 
     # gcc pre-release 3.4 adds -mtune itanium and itanium2
-    case $host_cpu in
+    case $gmp_cpu in
       itanium)   gcc_cflags_tune="-mtune=itanium" ;;
       itanium2)  gcc_cflags_tune="-mtune=itanium2" ;;
     esac
@@ -860,7 +864,7 @@
     # gcc 2.95 adds -mcpu32, -m68060.
     # FIXME: Maybe "-m68020 -mnobitfield" would suit cpu32 on 2.7.2.
     #
-    case $host_cpu in
+    case $gmp_cpu in
     m68020)  gcc_cflags_arch="-m68020" ;;
     m68030)  gcc_cflags_arch="-m68030" ;;
     m68040)  gcc_cflags_arch="-m68040" ;;
@@ -872,7 +876,7 @@
     # FIXME: m68k/mc68020 looks like it's ok for cpu32, but this wants to be
     # tested.  Will need to introduce an m68k/cpu32 if m68k/mc68020 ever uses
     # the bitfield instructions.
-    case $host_cpu in
+    case $gmp_cpu in
     [m680[234]0 | m68360])  path="m68k/mc68020 m68k" ;;
     *)                      path="m68k" ;;
     esac
@@ -973,7 +977,7 @@
     SPEED_CYCLECOUNTER_OBJ=powerpc.lo
     cyclecounter_size=0
 
-    case $host_cpu in
+    case $gmp_cpu in
       powerpc740 | powerpc750)
         path="powerpc32/750 powerpc32" ;;
       powerpc7400 | powerpc7410)
@@ -984,7 +988,7 @@
         path="powerpc32" ;;
     esac
 
-    case $host_cpu in
+    case $gmp_cpu in
       powerpc401)   gcc_cflags_cpu="-mcpu=401" ;;
       powerpc403)   gcc_cflags_cpu="-mcpu=403"
                    xlc_cflags_arch="-qarch=403 -qarch=ppc" ;;
@@ -1216,7 +1220,7 @@
     extra_functions="udiv_w_sdiv"
     gcc_32_cflags_maybe="-m31"
 
-    case $host_cpu in
+    case $gmp_cpu in
       s390)
        ;;
       z900 | z900esa)
@@ -1272,7 +1276,7 @@
        cclist_64="gcc"
        gcc_64_cflags_optlist="arch"
        gcc_64_cflags="$gcc_cflags -m64"
-       path_64="s390_64/$host_cpu s390_64"
+       path_64="s390_64/$gmp_cpu s390_64"
        extra_functions=""
        ;;
       esac
@@ -1297,7 +1301,7 @@
     any_testlist="sizeof-long-4"
     GMP_INCLUDE_MPN(sparc32/sparc-defs.m4)
 
-    case $host_cpu in
+    case $gmp_cpu in
       sparcv8 | microsparc | turbosparc)
         path="sparc32/v8 sparc32" ;;
       supersparc)
@@ -1333,7 +1337,7 @@
     #   plain -m forms will disappear.
     # gcc 3.3 adds ultrasparc3.
     #
-    case $host_cpu in
+    case $gmp_cpu in
       supersparc*)
                        gcc_cflags_cpu="-mcpu=supersparc -msupersparc"
                        gcc_cflags_asm="-Wa,-Av8 -Wa,-xarch=v8";;
@@ -1381,7 +1385,7 @@
 
         # SunOS cc doesn't know -xarch, apparently always generating v7
         # code, so make this optional
-       case $host_cpu in
+       case $gmp_cpu in
          sparcv8 | microsparc* | supersparc* | turbosparc | hypersparc*)
                        cc_cflags_arch="-xarch=v8";;
           [ultrasparct[345]])
@@ -1397,7 +1401,7 @@
        #   micro2, hyper, hyper2, powerup, ultra, ultra2, ultra2i.
        # SunPRO cc 6 adds -xchip=ultra2e, ultra3cu.
         #
-       case $host_cpu in
+       case $gmp_cpu in
          supersparc*)  cc_cflags_cpu="-xchip=super" ;;
          microsparc*)  cc_cflags_cpu="-xchip=micro" ;;
          turbosparc)   cc_cflags_cpu="-xchip=micro2" ;;
@@ -1416,7 +1420,7 @@
        esac
     esac
 
-    case $host_cpu in
+    case $gmp_cpu in
       sparc64 | sparcv9* | ultrasparc*)
         case $host in
           # Solaris 6 and earlier cannot run ABI=64 since it doesn't save
@@ -1443,7 +1447,7 @@
           *) abilist="64 32" ;;
         esac
 
-       case $host_cpu in
+       case $gmp_cpu in
          ultrasparc | ultrasparc2 | ultrasparc2i)
            path_64="sparc64/ultrasparc1234 sparc64" ;;
          [ultrasparc[34]])
@@ -1484,7 +1488,7 @@
             #
             cclist_64="$cclist_64 cc"
             cc_64_cflags_optlist="cpu"
-            case $host_cpu in
+            case $gmp_cpu in
               [ultrasparct[345]])
                 cc_64_cflags="$cc_64_cflags -xO3 -xarch=v9d" ;;
               *)
@@ -1528,7 +1532,7 @@
   #
   # -m32 forces 32-bit mode on a bi-arch 32/64 amd64 build of gcc.  -m64 is
   # the default in such a build (we think), so -m32 is essential for ABI=32.
-  # This is, of course, done for any $host_cpu, not just x86_64, so we can
+  # This is, of course, done for any $gmp_cpu, not just x86_64, so we can
   # get such a gcc into the right mode to cross-compile to say i486-*-*.
   #
   # -m32 is not available in gcc 2.95 and earlier, hence cflags_maybe to use
@@ -1585,7 +1589,7 @@
     # duplicate anything.
     #
     gcc_cflags_optlist="cpu arch"
-    case $host_cpu in
+    case $gmp_cpu in
       i386*)
        gcc_cflags_cpu="-mtune=i386 -mcpu=i386 -m386"
        gcc_cflags_arch="-march=i386"
diff -urN gmp-6.0.0.org/configure.ac~ gmp-6.0.0/configure.ac~
--- gmp-6.0.0.org/configure.ac~ 1970-01-01 01:00:00.000000000 +0100
+++ gmp-6.0.0/configure.ac~     2014-03-25 15:37:55.000000000 +0100
@@ -0,0 +1,3816 @@
+dnl  Process this file with autoconf to produce a configure script.
+
+
+define(GMP_COPYRIGHT,[[
+
+Copyright 1996-2014 Free Software Foundation, Inc.
+
+This file is part of the GNU MP Library.
+
+The GNU MP Library is free software; you can redistribute it and/or modify
+it under the terms of either:
+
+  * the GNU Lesser General Public License as published by the Free
+    Software Foundation; either version 3 of the License, or (at your
+    option) any later version.
+
+or
+
+  * the GNU General Public License as published by the Free Software
+    Foundation; either version 2 of the License, or (at your option) any
+    later version.
+
+or both in parallel, as here.
+
+The GNU MP Library is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+You should have received copies of the GNU General Public License and the
+GNU Lesser General Public License along with the GNU MP Library.  If not,
+see https://www.gnu.org/licenses/.
+]])
+
+AC_COPYRIGHT(GMP_COPYRIGHT)
+AH_TOP(/*GMP_COPYRIGHT*/)
+
+AC_REVISION($Revision$)
+AC_PREREQ(2.59)
+AC_INIT(GNU MP, GMP_VERSION, [gmp-bugs@gmplib.org, see https://gmplib.org/manual/Reporting-Bugs.html], gmp)
+AC_CONFIG_SRCDIR(gmp-impl.h)
+m4_pattern_forbid([^[ \t]*GMP_])
+m4_pattern_allow(GMP_LDFLAGS)
+m4_pattern_allow(GMP_LIMB_BITS)
+m4_pattern_allow(GMP_MPARAM_H_SUGGEST)
+m4_pattern_allow(GMP_NAIL_BITS)
+m4_pattern_allow(GMP_NUMB_BITS)
+m4_pattern_allow(GMP_NONSTD_ABI)
+m4_pattern_allow(GMP_CPU_TYPE)
+
+# If --target is not used then $target_alias is empty, but if say
+# "./configure athlon-pc-freebsd3.5" is used, then all three of
+# $build_alias, $host_alias and $target_alias are set to
+# "athlon-pc-freebsd3.5".
+#
+if test -n "$target_alias" && test "$target_alias" != "$host_alias"; then
+  AC_MSG_ERROR([--target is not appropriate for GMP
+Use --build=CPU-VENDOR-OS if you need to specify your CPU and/or system
+explicitly.  Use --host if cross-compiling (see "Installing GMP" in the
+manual for more on this).])
+fi
+
+GMP_INIT(config.m4)
+
+AC_CANONICAL_HOST
+
+dnl  Automake "no-dependencies" is used because include file dependencies
+dnl  are not useful to us.  Pretty much everything depends just on gmp.h,
+dnl  gmp-impl.h and longlong.h, and yet only rarely does everything need to
+dnl  be rebuilt for changes to those files.
+dnl
+dnl  "no-dependencies" also helps with the way we're setup to run
+dnl  AC_PROG_CXX only conditionally.  If dependencies are used then recent
+dnl  automake (eg 1.7.2) appends an AM_CONDITIONAL to AC_PROG_CXX, and then
+dnl  gets upset if it's not actually executed.
+dnl
+dnl  Note that there's a copy of these options in the top-level Makefile.am,
+dnl  so update there too if changing anything.
+dnl
+AM_INIT_AUTOMAKE([1.8 gnu no-dependencies])
+AC_CONFIG_HEADERS(config.h:config.in)
+AM_MAINTAINER_MODE
+
+
+AC_ARG_ENABLE(assert,
+AC_HELP_STRING([--enable-assert],[enable ASSERT checking [[default=no]]]),
+[case $enableval in
+yes|no) ;;
+*) AC_MSG_ERROR([bad value $enableval for --enable-assert, need yes or no]) ;;
+esac],
+[enable_assert=no])
+
+if test "$enable_assert" = "yes"; then
+  AC_DEFINE(WANT_ASSERT,1,
+  [Define to 1 to enable ASSERT checking, per --enable-assert])
+  want_assert_01=1
+else
+  want_assert_01=0
+fi
+GMP_DEFINE_RAW(["define(<WANT_ASSERT>,$want_assert_01)"])
+
+
+AC_ARG_ENABLE(alloca,
+AC_HELP_STRING([--enable-alloca],[how to get temp memory [[default=reentrant]]]),
+[case $enableval in
+alloca|malloc-reentrant|malloc-notreentrant) ;;
+yes|no|reentrant|notreentrant) ;;
+debug) ;;
+*)
+  AC_MSG_ERROR([bad value $enableval for --enable-alloca, need one of:
+yes no reentrant notreentrant alloca malloc-reentrant malloc-notreentrant debug]) ;;
+esac],
+[enable_alloca=reentrant])
+
+
+# IMPROVE ME: The default for C++ is disabled.  The tests currently
+# performed below for a working C++ compiler are not particularly strong,
+# and in general can't be expected to get the right setup on their own.  The
+# most significant problem is getting the ABI the same.  Defaulting CXXFLAGS
+# to CFLAGS takes only a small step towards this.  It's also probably worth
+# worrying whether the C and C++ runtimes from say gcc and a vendor C++ can
+# work together.  Some rather broken C++ installations were encountered
+# during testing, and though such things clearly aren't GMP's problem, if
+# --enable-cxx=detect were to be the default then some careful checks of
+# which, if any, C++ compiler on the system is up to scratch would be
+# wanted.
+#
+AC_ARG_ENABLE(cxx,
+AC_HELP_STRING([--enable-cxx],[enable C++ support [[default=no]]]),
+[case $enableval in
+yes|no|detect) ;;
+*) AC_MSG_ERROR([bad value $enableval for --enable-cxx, need yes/no/detect]) ;;
+esac],
+[enable_cxx=no])
+
+
+AC_ARG_ENABLE(assembly,
+AC_HELP_STRING([--enable-assembly],[enable the use of assembly loops [[default=yes]]]),
+[case $enableval in
+yes|no) ;;
+*) AC_MSG_ERROR([bad value $enableval for --enable-assembly, need yes or no]) ;;
+esac],
+[enable_assembly=yes])
+
+if test "$enable_assembly" = "yes"; then
+  AC_DEFINE(WANT_ASSEMBLY,1,
+  [Defined to 1 as per --enable-assembly])
+fi
+
+
+AC_ARG_ENABLE(fft,
+AC_HELP_STRING([--enable-fft],[enable FFTs for multiplication [[default=yes]]]),
+[case $enableval in
+yes|no) ;;
+*) AC_MSG_ERROR([bad value $enableval for --enable-fft, need yes or no]) ;;
+esac],
+[enable_fft=yes])
+
+if test "$enable_fft" = "yes"; then
+  AC_DEFINE(WANT_FFT,1,
+  [Define to 1 to enable FFTs for multiplication, per --enable-fft])
+fi
+
+
+AC_ARG_ENABLE(old-fft-full,
+AC_HELP_STRING([--enable-old-fft-full],[enable old mpn_mul_fft_full for multiplication [[default=no]]]),
+[case $enableval in
+yes|no) ;;
+*) AC_MSG_ERROR([bad value $enableval for --enable-old-fft-full, need yes or no]) ;;
+esac],
+[enable_old_fft_full=no])
+
+if test "$enable_old_fft_full" = "yes"; then
+  AC_DEFINE(WANT_OLD_FFT_FULL,1,
+  [Define to 1 to enable old mpn_mul_fft_full for multiplication, per --enable-old-fft-full])
+fi
+
+
+AC_ARG_ENABLE(nails,
+AC_HELP_STRING([--enable-nails],[use nails on limbs [[default=no]]]),
+[case $enableval in
+[yes|no|[02468]|[0-9][02468]]) ;;
+[*[13579]])
+  AC_MSG_ERROR([bad value $enableval for --enable-nails, only even nail sizes supported]) ;;
+*)
+  AC_MSG_ERROR([bad value $enableval for --enable-nails, need yes/no/number]) ;;
+esac],
+[enable_nails=no])
+
+case $enable_nails in
+yes) GMP_NAIL_BITS=2 ;;
+no)  GMP_NAIL_BITS=0 ;;
+*)   GMP_NAIL_BITS=$enable_nails ;;
+esac
+AC_SUBST(GMP_NAIL_BITS)
+
+
+AC_ARG_ENABLE(profiling,
+AC_HELP_STRING([--enable-profiling],
+               [build with profiler support [[default=no]]]),
+[case $enableval in
+no|prof|gprof|instrument) ;;
+*) AC_MSG_ERROR([bad value $enableval for --enable-profiling, need no/prof/gprof/instrument]) ;;
+esac],
+[enable_profiling=no])
+
+case $enable_profiling in
+  prof)
+    AC_DEFINE(WANT_PROFILING_PROF, 1,
+              [Define to 1 if --enable-profiling=prof])
+    ;;
+  gprof)
+    AC_DEFINE(WANT_PROFILING_GPROF, 1,
+              [Define to 1 if --enable-profiling=gprof])
+    ;;
+  instrument)
+    AC_DEFINE(WANT_PROFILING_INSTRUMENT, 1,
+              [Define to 1 if --enable-profiling=instrument])
+    ;;
+esac
+
+GMP_DEFINE_RAW(["define(<WANT_PROFILING>,<\`$enable_profiling'>)"])
+
+# -fomit-frame-pointer is incompatible with -pg on some chips
+if test "$enable_profiling" = gprof; then
+  fomit_frame_pointer=
+else
+  fomit_frame_pointer="-fomit-frame-pointer"
+fi
+
+
+AC_ARG_WITH(readline,
+AC_HELP_STRING([--with-readline],
+               [readline support in calc demo program [[default=detect]]]),
+[case $withval in
+yes|no|detect) ;;
+*) AC_MSG_ERROR([bad value $withval for --with-readline, need yes/no/detect]) ;;
+esac],
+[with_readline=detect])
+
+
+AC_ARG_ENABLE(fat,
+AC_HELP_STRING([--enable-fat],
+               [build a fat binary on systems that support it [[default=no]]]),
+[case $enableval in
+yes|no) ;;
+*) AC_MSG_ERROR([bad value $enableval for --enable-fat, need yes or no]) ;;
+esac],
+[enable_fat=no])
+
+
+AC_ARG_ENABLE(minithres,
+AC_HELP_STRING([--enable-minithres],
+               [choose minimal thresholds for testing [[default=no]]]),
+[case $enableval in
+yes|no) ;;
+*) AC_MSG_ERROR([bad value $enableval for --enable-minithres, need yes or no]) ;;
+esac],
+[enable_minithres=no])
+
+
+AC_ARG_ENABLE(fake-cpuid,
+AC_HELP_STRING([--enable-fake-cpuid],[enable GMP_CPU_TYPE faking cpuid [[default=no]]]),
+[case $enableval in
+yes|no) ;;
+*) AC_MSG_ERROR([bad value $enableval for --enable-fake-cpuid, need yes or no]) ;;
+esac],
+[enable_fake_cpuid=no])
+
+if test "$enable_fake_cpuid" = "yes"; then
+  AC_DEFINE(WANT_FAKE_CPUID,1,
+  [Define to 1 to enable GMP_CPU_TYPE faking cpuid, per --enable-fake-cpuid])
+fi
+
+
+if test $enable_fat = yes && test $enable_assembly = no ; then
+  AC_MSG_ERROR([when doing a fat build, disabling assembly will not work])
+fi
+
+if test $enable_fake_cpuid = yes && test $enable_fat = no ; then
+  AC_MSG_ERROR([--enable-fake-cpuid requires --enable-fat])
+fi
+
+
+tmp_host=`echo $host_cpu | sed 's/\./_/'`
+AC_DEFINE_UNQUOTED(HAVE_HOST_CPU_$tmp_host)
+GMP_DEFINE_RAW("define_not_for_expansion(\`HAVE_HOST_CPU_$tmp_host')", POST)
+
+dnl  The HAVE_HOST_CPU_ list here only needs to have entries for those which
+dnl  are going to be tested, not everything that can possibly be selected.
+dnl
+dnl  The HAVE_HOST_CPU_FAMILY_ list similarly, and note that the AC_DEFINEs
+dnl  for these are under the cpu specific setups below.
+
+AH_VERBATIM([HAVE_HOST_CPU_1],
+[/* Define one of these to 1 for the host CPU family.
+   If your CPU is not in any of these families, leave all undefined.
+   For an AMD64 chip, define "x86" in ABI=32, but not in ABI=64. */
+#undef HAVE_HOST_CPU_FAMILY_alpha
+#undef HAVE_HOST_CPU_FAMILY_m68k
+#undef HAVE_HOST_CPU_FAMILY_power
+#undef HAVE_HOST_CPU_FAMILY_powerpc
+#undef HAVE_HOST_CPU_FAMILY_x86
+#undef HAVE_HOST_CPU_FAMILY_x86_64
+
+/* Define one of the following to 1 for the host CPU, as per the output of
+   ./config.guess.  If your CPU is not listed here, leave all undefined.  */
+#undef HAVE_HOST_CPU_alphaev67
+#undef HAVE_HOST_CPU_alphaev68
+#undef HAVE_HOST_CPU_alphaev7
+#undef HAVE_HOST_CPU_m68020
+#undef HAVE_HOST_CPU_m68030
+#undef HAVE_HOST_CPU_m68040
+#undef HAVE_HOST_CPU_m68060
+#undef HAVE_HOST_CPU_m68360
+#undef HAVE_HOST_CPU_powerpc604
+#undef HAVE_HOST_CPU_powerpc604e
+#undef HAVE_HOST_CPU_powerpc750
+#undef HAVE_HOST_CPU_powerpc7400
+#undef HAVE_HOST_CPU_supersparc
+#undef HAVE_HOST_CPU_i386
+#undef HAVE_HOST_CPU_i586
+#undef HAVE_HOST_CPU_i686
+#undef HAVE_HOST_CPU_pentium
+#undef HAVE_HOST_CPU_pentiummmx
+#undef HAVE_HOST_CPU_pentiumpro
+#undef HAVE_HOST_CPU_pentium2
+#undef HAVE_HOST_CPU_pentium3
+#undef HAVE_HOST_CPU_s390_z900
+#undef HAVE_HOST_CPU_s390_z990
+#undef HAVE_HOST_CPU_s390_z9
+#undef HAVE_HOST_CPU_s390_z10
+#undef HAVE_HOST_CPU_s390_z196
+
+/* Define to 1 iff we have a s390 with 64-bit registers.  */
+#undef HAVE_HOST_CPU_s390_zarch])
+
+
+# Table of compilers, options, and mpn paths.  This code has various related
+# purposes
+#
+#   - better default CC/CFLAGS selections than autoconf otherwise gives
+#   - default CC/CFLAGS selections for extra CPU types specific to GMP
+#   - a few tests for known bad compilers
+#   - choice of ABIs on suitable systems
+#   - selection of corresponding mpn search path
+#
+# After GMP specific searches and tests, the standard autoconf AC_PROG_CC is
+# called.  User selections of CC etc are respected.
+#
+# Care is taken not to use macros like AC_TRY_COMPILE during the GMP
+# pre-testing, since they of course depend on AC_PROG_CC, and also some of
+# them cache their results, which is not wanted.
+#
+# The ABI selection mechanism is unique to GMP.  All that reaches autoconf
+# is a different selection of CC/CFLAGS according to the best ABI the system
+# supports, and/or what the user selects.  Naturally the mpn assembler code
+# selected is very dependent on the ABI.
+#
+# The closest the standard tools come to a notion of ABI is something like
+# "sparc64" which encodes a CPU and an ABI together.  This doesn't seem to
+# scale well for GMP, where exact CPU types like "ultrasparc2" are wanted,
+# separate from the ABI used on them.
+#
+#
+# The variables set here are
+#
+#   cclist              the compiler choices
+#   xx_cflags           flags for compiler xx
+#   xx_cflags_maybe     flags for compiler xx, if they work
+#   xx_cppflags         cpp flags for compiler xx
+#   xx_cflags_optlist   list of sets of optional flags
+#   xx_cflags_yyy       set yyy of optional flags for compiler xx
+#   xx_ldflags          -Wc,-foo flags for libtool linking with compiler xx
+#   ar_flags            extra flags for $AR
+#   nm_flags            extra flags for $NM
+#   limb                limb size, can be "longlong"
+#   path                mpn search path
+#   extra_functions     extra mpn functions
+#   fat_path            fat binary mpn search path [if fat binary desired]
+#   fat_functions       fat functions
+#   fat_thresholds      fat thresholds
+#
+# Suppose xx_cflags_optlist="arch", then flags from $xx_cflags_arch are
+# tried, and the first flag that works will be used.  An optlist like "arch
+# cpu optimize" can be used to get multiple independent sets of flags tried.
+# The first that works from each will be used.  If no flag in a set works
+# then nothing from that set is added.
+#
+# For multiple ABIs, the scheme extends as follows.
+#
+#   abilist               set of ABI choices
+#   cclist_aa             compiler choices in ABI aa
+#   xx_aa_cflags          flags for xx in ABI aa
+#   xx_aa_cflags_maybe    flags for xx in ABI aa, if they work
+#   xx_aa_cppflags        cpp flags for xx in ABI aa
+#   xx_aa_cflags_optlist  list of sets of optional flags in ABI aa
+#   xx_aa_cflags_yyy      set yyy of optional flags for compiler xx in ABI aa
+#   xx_aa_ldflags         -Wc,-foo flags for libtool linking
+#   ar_aa_flags           extra flags for $AR in ABI aa
+#   nm_aa_flags           extra flags for $NM in ABI aa
+#   limb_aa               limb size in ABI aa, can be "longlong"
+#   path_aa               mpn search path in ABI aa
+#   extra_functions_aa    extra mpn functions in ABI aa
+#
+# As a convenience, the unadorned xx_cflags (etc) are used for the last ABI
+# in ablist, if an xx_aa_cflags for that ABI isn't given.  For example if
+# abilist="64 32" then $cc_64_cflags will be used for the 64-bit ABI, but
+# for the 32-bit either $cc_32_cflags or $cc_cflags is used, whichever is
+# defined.  This makes it easy to add some 64-bit compilers and flags to an
+# unadorned 32-bit set.
+#
+# limb=longlong (or limb_aa=longlong) applies to all compilers within that
+# ABI.  It won't work to have some needing long long and some not, since a
+# single instantiated gmp.h will be used by both.
+#
+# SPEED_CYCLECOUNTER, cyclecounter_size and CALLING_CONVENTIONS_OBJS are
+# also set here, with an ABI suffix.
+#
+#
+#
+# A table-driven approach like this to mapping cpu type to good compiler
+# options is a bit of a maintenance burden, but there's not much uniformity
+# between options specifications on different compilers.  Some sort of
+# separately updatable tool might be cute.
+#
+# The use of lots of variables like this, direct and indirect, tends to
+# obscure when and how various things are done, but unfortunately it's
+# pretty much the only way.  If shell subroutines were portable then actual
+# code like "if this .. do that" could be written, but attempting the same
+# with full copies of GMP_PROG_CC_WORKS etc expanded at every point would
+# hugely bloat the output.
+
+
+AC_ARG_VAR(ABI, [desired ABI (for processors supporting more than one ABI)])
+
+# abilist needs to be non-empty, "standard" is just a generic name here
+abilist="standard"
+
+# FIXME: We'd like to prefer an ANSI compiler, perhaps by preferring
+# c89 over cc here.  But note that on HP-UX c89 provides a castrated
+# environment, and would want to be excluded somehow.  Maybe
+# AC_PROG_CC_STDC already does enough to stick cc into ANSI mode and
+# we don't need to worry.
+#
+cclist="gcc cc"
+
+gcc_cflags="-O2 -pedantic"
+gcc_64_cflags="-O2 -pedantic"
+cc_cflags="-O"
+cc_64_cflags="-O"
+
+SPEED_CYCLECOUNTER_OBJ=
+cyclecounter_size=2
+
+AC_SUBST(HAVE_HOST_CPU_FAMILY_power,  0)
+AC_SUBST(HAVE_HOST_CPU_FAMILY_powerpc,0)
+
+case $host in
+
+  alpha*-*-*)
+    AC_DEFINE(HAVE_HOST_CPU_FAMILY_alpha)
+    case $host_cpu in
+      alphaev5* | alphapca5*)
+       path="alpha/ev5 alpha" ;;
+      alphaev67 | alphaev68 | alphaev7*)
+        path="alpha/ev67 alpha/ev6 alpha" ;;
+      alphaev6)
+       path="alpha/ev6 alpha" ;;
+      *)
+        path="alpha" ;;
+    esac
+    if test "$enable_assembly" = "yes" ; then
+       extra_functions="cntlz"
+    fi
+    gcc_cflags_optlist="asm cpu oldas" # need asm ahead of cpu, see below
+    gcc_cflags_maybe="-mieee"
+    gcc_cflags_oldas="-Wa,-oldas"     # see GMP_GCC_WA_OLDAS.
+
+    # gcc 2.7.2.3 doesn't know any -mcpu= for alpha, apparently.
+    # gcc 2.95 knows -mcpu= ev4, ev5, ev56, pca56, ev6.
+    # gcc 3.0 adds nothing.
+    # gcc 3.1 adds ev45, ev67 (but ev45 is the same as ev4).
+    # gcc 3.2 adds nothing.
+    #
+    # gcc version "2.9-gnupro-99r1" under "-O2 -mcpu=ev6" strikes internal
+    # compiler errors too easily and is rejected by GMP_PROG_CC_WORKS.  Each
+    # -mcpu=ev6 below has a fallback to -mcpu=ev56 for this reason.
+    #
+    case $host_cpu in
+      alpha)        gcc_cflags_cpu="-mcpu=ev4" ;;
+      alphaev5)     gcc_cflags_cpu="-mcpu=ev5" ;;
+      alphaev56)    gcc_cflags_cpu="-mcpu=ev56" ;;
+      alphapca56 | alphapca57)
+                    gcc_cflags_cpu="-mcpu=pca56" ;;
+      alphaev6)     gcc_cflags_cpu="-mcpu=ev6 -mcpu=ev56" ;;
+      alphaev67 | alphaev68 | alphaev7*)
+                    gcc_cflags_cpu="-mcpu=ev67 -mcpu=ev6 -mcpu=ev56" ;;
+    esac
+
+    # gcc version "2.9-gnupro-99r1" on alphaev68-dec-osf5.1 has been seen
+    # accepting -mcpu=ev6, but not putting the assembler in the right mode
+    # for what it produces.  We need to do this for it, and need to do it
+    # before testing the -mcpu options.
+    #
+    # On old versions of gcc, which don't know -mcpu=, we believe an
+    # explicit -Wa,-mev5 etc will be necessary to put the assembler in
+    # the right mode for our .asm files and longlong.h asm blocks.
+    #
+    # On newer versions of gcc, when -mcpu= is known, we must give a -Wa
+    # which is at least as high as the code gcc will generate.  gcc
+    # establishes what it needs with a ".arch" directive, our command line
+    # option seems to override that.
+    #
+    # gas prior to 2.14 doesn't accept -mev67, but -mev6 seems enough for
+    # ctlz and cttz (in 2.10.0 at least).
+    #
+    # OSF `as' accepts ev68 but stupidly treats it as ev4.  -arch only seems
+    # to affect insns like ldbu which are expanded as macros when necessary.
+    # Insns like ctlz which were never available as macros are always
+    # accepted and always generate their plain code.
+    #
+    case $host_cpu in
+      alpha)        gcc_cflags_asm="-Wa,-arch,ev4 -Wa,-mev4" ;;
+      alphaev5)     gcc_cflags_asm="-Wa,-arch,ev5 -Wa,-mev5" ;;
+      alphaev56)    gcc_cflags_asm="-Wa,-arch,ev56 -Wa,-mev56" ;;
+      alphapca56 | alphapca57)
+                    gcc_cflags_asm="-Wa,-arch,pca56 -Wa,-mpca56" ;;
+      alphaev6)     gcc_cflags_asm="-Wa,-arch,ev6 -Wa,-mev6" ;;
+      alphaev67 | alphaev68 | alphaev7*)
+                    gcc_cflags_asm="-Wa,-arch,ev67 -Wa,-mev67 -Wa,-arch,ev6 -Wa,-mev6" ;;
+    esac
+
+    # It might be better to ask "cc" whether it's Cray C or DEC C,
+    # instead of relying on the OS part of $host.  But it's hard to
+    # imagine either of those compilers anywhere except their native
+    # systems.
+    #
+    GMP_INCLUDE_MPN(alpha/alpha-defs.m4)
+    case $host in
+      *-cray-unicos*)
+        cc_cflags="-O"         # no -g, it silently disables all optimizations
+        GMP_INCLUDE_MPN(alpha/unicos.m4)
+        # Don't perform any assembly syntax tests on this beast.
+        gmp_asm_syntax_testing=no
+        ;;
+      *-*-osf*)
+        GMP_INCLUDE_MPN(alpha/default.m4)
+        cc_cflags=""
+        cc_cflags_optlist="opt cpu"
+
+        # not sure if -fast works on old versions, so make it optional
+       cc_cflags_opt="-fast -O2"
+
+       # DEC C V5.9-005 knows ev4, ev5, ev56, pca56, ev6.
+       # Compaq C V6.3-029 adds ev67.
+       #
+       case $host_cpu in
+         alpha)       cc_cflags_cpu="-arch~ev4~-tune~ev4" ;;
+         alphaev5)    cc_cflags_cpu="-arch~ev5~-tune~ev5" ;;
+         alphaev56)   cc_cflags_cpu="-arch~ev56~-tune~ev56" ;;
+         alphapca56 | alphapca57)
+            cc_cflags_cpu="-arch~pca56~-tune~pca56" ;;
+         alphaev6)    cc_cflags_cpu="-arch~ev6~-tune~ev6" ;;
+         alphaev67 | alphaev68 | alphaev7*)
+            cc_cflags_cpu="-arch~ev67~-tune~ev67 -arch~ev6~-tune~ev6" ;;
+       esac
+        ;;
+      *)
+        GMP_INCLUDE_MPN(alpha/default.m4)
+        ;;
+    esac
+
+    case $host in
+      *-*-unicos*)
+        # tune/alpha.asm assumes int==4bytes but unicos uses int==8bytes
+        ;;
+      *)
+        SPEED_CYCLECOUNTER_OBJ=alpha.lo
+        cyclecounter_size=1 ;;
+    esac
+    ;;
+
+
+  # Cray vector machines.
+  # This must come after alpha* so that we can recognize present and future
+  # vector processors with a wildcard.
+  *-cray-unicos*)
+    gmp_asm_syntax_testing=no
+    cclist="cc"
+    # We used to have -hscalar0 here as a workaround for miscompilation of
+    # mpz/import.c, but let's hope Cray fixes their bugs instead, since
+    # -hscalar0 causes disastrously poor code to be generated.
+    cc_cflags="-O3 -hnofastmd -htask0 -Wa,-B"
+    path="cray"
+    ;;
+
+
+  arm64*-*-* | aarch64*-*-*)
+    path="arm64"
+    ;;
+
+
+  arm*-*-*)
+    gcc_cflags="$gcc_cflags $fomit_frame_pointer"
+    gcc_cflags_optlist="arch neon tune"
+    gcc_cflags_maybe="-marm"
+    gcc_testlist="gcc-arm-umodsi"
+    GMP_INCLUDE_MPN(arm/arm-defs.m4)
+    CALLING_CONVENTIONS_OBJS='arm32call.lo arm32check.lo'
+
+    # FIXME: We make mandatory compiler options optional here.  We should
+    # either enforce them, or organise to strip paths as the corresponding
+    # options fail.
+    case $host_cpu in
+      armsa1 | arm9tdmi | armv4*)
+       path="arm"
+       gcc_cflags_arch="-march=armv4"
+       ;;
+      armxscale | arm9te | arm10 | armv5*)
+       path="arm/v5 arm"
+       gcc_cflags_arch="-march=armv5"
+       ;;
+      arm11mpcore | arm1136 | arm1176 | armv6*)
+       path="arm/v6 arm/v5 arm"
+       gcc_cflags_arch="-march=armv6"
+       ;;
+      arm1156)
+       path="arm/v6t2 arm/v6 arm/v5 arm"
+       gcc_cflags_arch="-march=armv6t2"
+       ;;
+      armcortexa5 | armv7a*)
+       path="arm/v6t2 arm/v6 arm/v5 arm"
+       gcc_cflags_arch="-march=armv7-a"
+       ;;
+      armcortexa8)
+       path="arm/v6t2 arm/v6 arm/v5 arm"
+       gcc_cflags_arch="-march=armv7-a"
+       gcc_cflags_tune="-mtune=cortex-a8"
+       ;;
+      armcortexa8neon)
+       path="arm/v6t2 arm/v6 arm/v5 arm/neon arm"
+       gcc_cflags_arch="-march=armv7-a"
+       gcc_cflags_neon="-mfpu=neon"
+       gcc_cflags_tune="-mtune=cortex-a8"
+       ;;
+      armcortexa9)
+       path="arm/v7a/cora9 arm/v6t2 arm/v6 arm/v5 arm"
+       gcc_cflags_arch="-march=armv7-a"
+       gcc_cflags_tune="-mtune=cortex-a9"
+       ;;
+      armcortexa9neon)
+       path="arm/v7a/cora9 arm/v6t2 arm/v6 arm/v5 arm/neon arm"
+       gcc_cflags_arch="-march=armv7-a"
+       gcc_cflags_neon="-mfpu=neon"
+       gcc_cflags_tune="-mtune=cortex-a9"
+       ;;
+      armcortexa15)
+       path="arm/v7a/cora15 arm/v6t2 arm/v6 arm/v5 arm"
+       gcc_cflags_arch="-march=armv7-a"
+       gcc_cflags_tune="-mtune=cortex-a15 -mtune=cortex-a9"
+       ;;
+      armcortexa15neon)
+       path="arm/v7a/cora15/neon arm/v7a/cora15 arm/v6t2 arm/v6 arm/v5 arm/neon arm"
+       gcc_cflags_arch="-march=armv7-a"
+       gcc_cflags_neon="-mfpu=neon"
+       gcc_cflags_tune="-mtune=cortex-a15 -mtune=cortex-a9"
+       ;;
+      *)
+       path="arm"
+       ;;
+    esac
+    ;;
+
+
+  # Fujitsu
+  [f30[01]-fujitsu-sysv*])
+    cclist="gcc vcc"
+    # FIXME: flags for vcc?
+    vcc_cflags="-g"
+    path="fujitsu"
+    ;;
+
+
+  hppa*-*-*)
+    # HP cc (the one sold separately) is K&R by default, but AM_C_PROTOTYPES
+    # will add "-Ae", or "-Aa -D_HPUX_SOURCE", to put it into ansi mode, if
+    # possible.
+    #
+    # gcc for hppa 2.0 can be built either for 2.0n (32-bit) or 2.0w
+    # (64-bit), but not both, so there's no option to choose the desired
+    # mode, we must instead detect which of the two it is.  This is done by
+    # checking sizeof(long), either 4 or 8 bytes respectively.  Do this in
+    # ABI=1.0 too, in case someone tries to build that with a 2.0w gcc.
+    #
+    gcc_cflags_optlist="arch"
+    gcc_testlist="sizeof-long-4"
+    SPEED_CYCLECOUNTER_OBJ=hppa.lo
+    cyclecounter_size=1
+
+    # FIXME: For hppa2.0*, path should be "pa32/hppa2_0 pa32/hppa1_1 pa32".
+    # (Can't remember why this isn't done already, have to check what .asm
+    # files are available in each and how they run on a typical 2.0 cpu.)
+    #
+    case $host_cpu in
+      hppa1.0*)    path="pa32" ;;
+      hppa7000*)   path="pa32/hppa1_1 pa32" ;;
+      hppa2.0* | hppa64)
+                   path="pa32/hppa2_0 pa32/hppa1_1/pa7100 pa32/hppa1_1 pa32" ;;
+      *)           # default to 7100
+                   path="pa32/hppa1_1/pa7100 pa32/hppa1_1 pa32" ;;
+    esac
+
+    # gcc 2.7.2.3 knows -mpa-risc-1-0 and -mpa-risc-1-1
+    # gcc 2.95 adds -mpa-risc-2-0, plus synonyms -march=1.0, 1.1 and 2.0
+    #
+    # We don't use -mpa-risc-2-0 in ABI=1.0 because 64-bit registers may not
+    # be saved by the kernel on an old system.  Actually gcc (as of 3.2)
+    # only adds a few float instructions with -mpa-risc-2-0, so it would
+    # probably be safe, but let's not take the chance.  In any case, a
+    # configuration like --host=hppa2.0 ABI=1.0 is far from optimal.
+    #
+    case $host_cpu in
+      hppa1.0*)           gcc_cflags_arch="-mpa-risc-1-0" ;;
+      *)                  # default to 7100
+                          gcc_cflags_arch="-mpa-risc-1-1" ;;
+    esac
+
+    case $host_cpu in
+      hppa1.0*)    cc_cflags="+O2" ;;
+      *)           # default to 7100
+                   cc_cflags="+DA1.1 +O2" ;;
+    esac
+
+    case $host in
+      hppa2.0*-*-* | hppa64-*-*)
+       cclist_20n="gcc cc"
+        abilist="2.0n 1.0"
+        path_20n="pa64"
+       limb_20n=longlong
+        any_20n_testlist="sizeof-long-4"
+        SPEED_CYCLECOUNTER_OBJ_20n=hppa2.lo
+        cyclecounter_size_20n=2
+
+        # -mpa-risc-2-0 is only an optional flag, in case an old gcc is
+        # used.  Assembler support for 2.0 is essential though, for our asm
+        # files.
+       gcc_20n_cflags="$gcc_cflags"
+       gcc_20n_cflags_optlist="arch"
+        gcc_20n_cflags_arch="-mpa-risc-2-0 -mpa-risc-1-1"
+        gcc_20n_testlist="sizeof-long-4 hppa-level-2.0"
+
+        cc_20n_cflags="+DA2.0 +e +O2 -Wl,+vnocompatwarnings"
+        cc_20n_testlist="hpc-hppa-2-0"
+
+       # ABI=2.0w is available for hppa2.0w and hppa2.0, but not for
+       # hppa2.0n, on the assumption that that the latter indicates a
+       # desire for ABI=2.0n.
+       case $host in
+        hppa2.0n-*-*) ;;
+        *)
+          # HPUX 10 and earlier cannot run 2.0w.  Not sure about other
+          # systems (GNU/Linux for instance), but lets assume they're ok.
+          case $host in
+            [*-*-hpux[1-9] | *-*-hpux[1-9].* | *-*-hpux10 | *-*-hpux10.*]) ;;
+           [*-*-linux*])  abilist="1.0" ;; # due to linux permanent kernel bug
+            *)    abilist="2.0w $abilist" ;;
+          esac
+
+          cclist_20w="gcc cc"
+         gcc_20w_cflags="$gcc_cflags -mpa-risc-2-0"
+          cc_20w_cflags="+DD64 +O2"
+          cc_20w_testlist="hpc-hppa-2-0"
+          path_20w="pa64"
+         any_20w_testlist="sizeof-long-8"
+          SPEED_CYCLECOUNTER_OBJ_20w=hppa2w.lo
+          cyclecounter_size_20w=2
+         ;;
+        esac
+        ;;
+    esac
+    ;;
+
+
+  IA64_PATTERN)
+    abilist="64"
+    GMP_INCLUDE_MPN(ia64/ia64-defs.m4)
+    SPEED_CYCLECOUNTER_OBJ=ia64.lo
+    any_32_testlist="sizeof-long-4"
+
+    case $host_cpu in
+      itanium)   path="ia64/itanium  ia64" ;;
+      itanium2)  path="ia64/itanium2 ia64" ;;
+      *)         path="ia64" ;;
+    esac
+
+    gcc_64_cflags_optlist="tune"
+    gcc_32_cflags_optlist=$gcc_64_cflags_optlist
+
+    # gcc pre-release 3.4 adds -mtune itanium and itanium2
+    case $host_cpu in
+      itanium)   gcc_cflags_tune="-mtune=itanium" ;;
+      itanium2)  gcc_cflags_tune="-mtune=itanium2" ;;
+    esac
+
+    case $host in
+      *-*-linux*)
+       cclist="gcc icc"
+       icc_cflags="-no-gcc"
+       icc_cflags_optlist="opt"
+       # Don't use -O3, it is for "large data sets" and also miscompiles GMP.
+       # But icc miscompiles GMP at any optimization level, at higher levels
+       # it miscompiles more files...
+       icc_cflags_opt="-O2 -O1"
+       ;;
+
+      *-*-hpux*)
+        # HP cc sometimes gets internal errors if the optimization level is
+        # too high.  GMP_PROG_CC_WORKS detects this, the "_opt" fallbacks
+        # let us use whatever seems to work.
+        #
+        abilist="32 64"
+        any_64_testlist="sizeof-long-8"
+
+        cclist_32="gcc cc"
+        path_32="ia64"
+        cc_32_cflags=""
+        cc_32_cflags_optlist="opt"
+        cc_32_cflags_opt="+O3 +O2 +O1"
+        gcc_32_cflags="$gcc_cflags -milp32"
+        limb_32=longlong
+        SPEED_CYCLECOUNTER_OBJ_32=ia64.lo
+        cyclecounter_size_32=2
+
+        # Must have +DD64 in CPPFLAGS to get the right __LP64__ for headers,
+        # but also need it in CFLAGS for linking programs, since automake
+        # only uses CFLAGS when linking, not CPPFLAGS.
+        # FIXME: Maybe should use cc_64_ldflags for this, but that would
+        # need GMP_LDFLAGS used consistently by all the programs.
+        #
+        cc_64_cflags="+DD64"
+        cc_64_cppflags="+DD64"
+        cc_64_cflags_optlist="opt"
+        cc_64_cflags_opt="+O3 +O2 +O1"
+        gcc_64_cflags="$gcc_cflags -mlp64"
+        ;;
+    esac
+    ;;
+
+
+  # Motorola 68k
+  #
+  M68K_PATTERN)
+    AC_DEFINE(HAVE_HOST_CPU_FAMILY_m68k)
+    GMP_INCLUDE_MPN(m68k/m68k-defs.m4)
+    gcc_cflags="$gcc_cflags $fomit_frame_pointer"
+    gcc_cflags_optlist="arch"
+
+    # gcc 2.7.2 knows -m68000, -m68020, -m68030, -m68040.
+    # gcc 2.95 adds -mcpu32, -m68060.
+    # FIXME: Maybe "-m68020 -mnobitfield" would suit cpu32 on 2.7.2.
+    #
+    case $host_cpu in
+    m68020)  gcc_cflags_arch="-m68020" ;;
+    m68030)  gcc_cflags_arch="-m68030" ;;
+    m68040)  gcc_cflags_arch="-m68040" ;;
+    m68060)  gcc_cflags_arch="-m68060 -m68000" ;;
+    m68360)  gcc_cflags_arch="-mcpu32 -m68000" ;;
+    *)       gcc_cflags_arch="-m68000" ;;
+    esac
+
+    # FIXME: m68k/mc68020 looks like it's ok for cpu32, but this wants to be
+    # tested.  Will need to introduce an m68k/cpu32 if m68k/mc68020 ever uses
+    # the bitfield instructions.
+    case $host_cpu in
+    [m680[234]0 | m68360])  path="m68k/mc68020 m68k" ;;
+    *)                      path="m68k" ;;
+    esac
+    ;;
+
+
+  # Motorola 88k
+  m88k*-*-*)
+    path="m88k"
+    ;;
+  m88110*-*-*)
+    gcc_cflags="$gcc_cflags -m88110"
+    path="m88k/mc88110 m88k"
+    ;;
+
+
+  # IRIX 5 and earlier can only run 32-bit o32.
+  #
+  # IRIX 6 and up always has a 64-bit mips CPU can run n32 or 64.  n32 is
+  # preferred over 64, but only because that's been the default in past
+  # versions of GMP.  The two are equally efficient.
+  #
+  # Linux kernel 2.2.13 arch/mips/kernel/irixelf.c has a comment about not
+  # supporting n32 or 64.
+  #
+  # For reference, libtool (eg. 1.5.6) recognises the n32 ABI and knows the
+  # right options to use when linking (both cc and gcc), so no need for
+  # anything special from us.
+  #
+  mips*-*-*)
+    abilist="o32"
+    gcc_cflags_optlist="abi"
+    gcc_cflags_abi="-mabi=32"
+    gcc_testlist="gcc-mips-o32"
+    path="mips32"
+    cc_cflags="-O2 -o32"   # no -g, it disables all optimizations
+    # this suits both mips32 and mips64
+    GMP_INCLUDE_MPN(mips32/mips-defs.m4)
+
+    case $host in
+      [mips64*-*-* | mips*-*-irix[6789]*])
+        abilist="n32 64 o32"
+
+        cclist_n32="gcc cc"
+        gcc_n32_cflags="$gcc_cflags -mabi=n32"
+        cc_n32_cflags="-O2 -n32"       # no -g, it disables all optimizations
+        limb_n32=longlong
+        path_n32="mips64"
+
+        cclist_64="gcc cc"
+        gcc_64_cflags="$gcc_cflags -mabi=64"
+        gcc_64_ldflags="-Wc,-mabi=64"
+        cc_64_cflags="-O2 -64"         # no -g, it disables all optimizations
+        cc_64_ldflags="-Wc,-64"
+        path_64="mips64"
+        ;;
+    esac
+    ;;
+
+
+  # Darwin (powerpc-apple-darwin1.3) has it's hacked gcc installed as cc.
+  # Our usual "gcc in disguise" detection means gcc_cflags etc here gets
+  # used.
+  #
+  # The darwin pre-compiling preprocessor is disabled with -no-cpp-precomp
+  # since it doesn't like "__attribute__ ((mode (SI)))" etc in gmp-impl.h,
+  # and so always ends up running the plain preprocessor anyway.  This could
+  # be done in CPPFLAGS rather than CFLAGS, but there's not many places
+  # preprocessing is done separately, and this is only a speedup, the normal
+  # preprocessor gets run if there's any problems.
+  #
+  # We used to use -Wa,-mppc with gcc, but can't remember exactly why.
+  # Presumably it was for old versions of gcc where -mpowerpc doesn't put
+  # the assembler in the right mode.  In any case -Wa,-mppc is not good, for
+  # instance -mcpu=604 makes recent gcc use -m604 to get access to the
+  # "fsel" instruction, but a -Wa,-mppc overrides that, making code that
+  # comes out with fsel fail.
+  #
+  # (Note also that the darwin assembler doesn't accept "-mppc", so any
+  # -Wa,-mppc was used only if it worked.  The right flag on darwin would be
+  # "-arch ppc" or some such, but that's already the default.)
+  #
+  [powerpc*-*-* | power[3-9]-*-*])
+    AC_DEFINE(HAVE_HOST_CPU_FAMILY_powerpc)
+    HAVE_HOST_CPU_FAMILY_powerpc=1
+    abilist="32"
+    cclist="gcc cc"
+    cc_cflags="-O2"
+    gcc_32_cflags="$gcc_cflags -mpowerpc"
+    gcc_cflags_optlist="precomp subtype asm cpu"
+    gcc_cflags_precomp="-no-cpp-precomp"
+    gcc_cflags_subtype="-force_cpusubtype_ALL" # for vmx on darwin
+    gcc_cflags_asm=""
+    gcc_cflags_cpu=""
+    vmx_path=""
+
+    # grab this object, though it's not a true cycle counter routine
+    SPEED_CYCLECOUNTER_OBJ=powerpc.lo
+    cyclecounter_size=0
+
+    case $host_cpu in
+      powerpc740 | powerpc750)
+        path="powerpc32/750 powerpc32" ;;
+      powerpc7400 | powerpc7410)
+        path="powerpc32/vmx powerpc32/750 powerpc32" ;;
+      [powerpc74[45]?])
+        path="powerpc32/vmx powerpc32" ;;
+      *)
+        path="powerpc32" ;;
+    esac
+
+    case $host_cpu in
+      powerpc401)   gcc_cflags_cpu="-mcpu=401" ;;
+      powerpc403)   gcc_cflags_cpu="-mcpu=403"
+                   xlc_cflags_arch="-qarch=403 -qarch=ppc" ;;
+      powerpc405)   gcc_cflags_cpu="-mcpu=405" ;;
+      powerpc505)   gcc_cflags_cpu="-mcpu=505" ;;
+      powerpc601)   gcc_cflags_cpu="-mcpu=601"
+                   xlc_cflags_arch="-qarch=601 -qarch=ppc" ;;
+      powerpc602)   gcc_cflags_cpu="-mcpu=602"
+                   xlc_cflags_arch="-qarch=602 -qarch=ppc" ;;
+      powerpc603)   gcc_cflags_cpu="-mcpu=603"
+                   xlc_cflags_arch="-qarch=603 -qarch=ppc" ;;
+      powerpc603e)  gcc_cflags_cpu="-mcpu=603e -mcpu=603"
+                   xlc_cflags_arch="-qarch=603 -qarch=ppc" ;;
+      powerpc604)   gcc_cflags_cpu="-mcpu=604"
+                   xlc_cflags_arch="-qarch=604 -qarch=ppc" ;;
+      powerpc604e)  gcc_cflags_cpu="-mcpu=604e -mcpu=604"
+                   xlc_cflags_arch="-qarch=604 -qarch=ppc" ;;
+      powerpc620)   gcc_cflags_cpu="-mcpu=620" ;;
+      powerpc630)   gcc_cflags_cpu="-mcpu=630"
+                   xlc_cflags_arch="-qarch=pwr3"
+                   cpu_path="p3 p3-p7" ;;
+      powerpc740)   gcc_cflags_cpu="-mcpu=740" ;;
+      powerpc7400 | powerpc7410)
+                   gcc_cflags_asm="-Wa,-maltivec"
+                   gcc_cflags_cpu="-mcpu=7400 -mcpu=750" ;;
+      [powerpc74[45]?])
+                   gcc_cflags_asm="-Wa,-maltivec"
+                   gcc_cflags_cpu="-mcpu=7450" ;;
+      powerpc750)   gcc_cflags_cpu="-mcpu=750" ;;
+      powerpc801)   gcc_cflags_cpu="-mcpu=801" ;;
+      powerpc821)   gcc_cflags_cpu="-mcpu=821" ;;
+      powerpc823)   gcc_cflags_cpu="-mcpu=823" ;;
+      powerpc860)   gcc_cflags_cpu="-mcpu=860" ;;
+      powerpc970)   gcc_cflags_cpu="-mtune=970"
+                   xlc_cflags_arch="-qarch=970 -qarch=pwr3"
+                   vmx_path="powerpc64/vmx"
+                   cpu_path="p4 p3-p7" ;;
+      power4)      gcc_cflags_cpu="-mtune=power4"
+                   xlc_cflags_arch="-qarch=pwr4"
+                   cpu_path="p4 p3-p7" ;;
+      power5)      gcc_cflags_cpu="-mtune=power5 -mtune=power4"
+                   xlc_cflags_arch="-qarch=pwr5"
+                   cpu_path="p5 p4 p3-p7" ;;
+      power6)      gcc_cflags_cpu="-mtune=power6"
+                   xlc_cflags_arch="-qarch=pwr6"
+                   cpu_path="p6 p3-p7" ;;
+      power7)      gcc_cflags_cpu="-mtune=power7 -mtune=power5"
+                   xlc_cflags_arch="-qarch=pwr7 -qarch=pwr5"
+                   cpu_path="p7 p5 p4 p3-p7" ;;
+    esac
+
+    case $host in
+      *-*-aix*)
+       cclist="gcc xlc cc"
+       gcc_32_cflags_maybe="-maix32"
+       xlc_cflags="-O2 -qmaxmem=20000"
+       xlc_cflags_optlist="arch"
+       xlc_32_cflags_maybe="-q32"
+       ar_32_flags="-X32"
+       nm_32_flags="-X32"
+    esac
+
+    case $host in
+      POWERPC64_PATTERN)
+       case $host in
+         *-*-aix*)
+           # On AIX a true 64-bit ABI is available.
+           # Need -Wc to pass object type flags through to the linker.
+           abilist="mode64 $abilist"
+           cclist_mode64="gcc xlc"
+           gcc_mode64_cflags="$gcc_cflags -maix64 -mpowerpc64"
+           gcc_mode64_cflags_optlist="cpu"
+           gcc_mode64_ldflags="-Wc,-maix64"
+           xlc_mode64_cflags="-O2 -q64 -qmaxmem=20000"
+           xlc_mode64_cflags_optlist="arch"
+           xlc_mode64_ldflags="-Wc,-q64"
+           # Must indicate object type to ar and nm
+           ar_mode64_flags="-X64"
+           nm_mode64_flags="-X64"
+           path_mode64=""
+           p=""
+           for i in $cpu_path
+             do path_mode64="${path_mode64}powerpc64/mode64/$i "
+                path_mode64="${path_mode64}powerpc64/$i "
+                p="${p} powerpc32/$i "
+             done
+           path_mode64="${path_mode64}powerpc64/mode64 $vmx_path powerpc64"
+           path="$p $path"
+           # grab this object, though it's not a true cycle counter routine
+           SPEED_CYCLECOUNTER_OBJ_mode64=powerpc64.lo
+           cyclecounter_size_mode64=0
+           ;;
+         *-*-darwin*)
+           # On Darwin we can use 64-bit instructions with a longlong limb,
+           # but the chip still in 32-bit mode.
+           # In theory this can be used on any OS which knows how to save
+           # 64-bit registers in a context switch.
+           #
+           # Note that we must use -mpowerpc64 with gcc, since the
+           # longlong.h macros expect limb operands in a single 64-bit
+           # register, not two 32-bit registers as would be given for a
+           # long long without -mpowerpc64.  In theory we could detect and
+           # accommodate both styles, but the proper 64-bit registers will
+           # be fastest and are what we really want to use.
+           #
+           # One would think -mpowerpc64 would set the assembler in the right
+           # mode to handle 64-bit instructions.  But for that, also
+           # -force_cpusubtype_ALL is needed.
+           #
+           # Do not use -fast for Darwin, it actually adds options
+           # incompatible with a shared library.
+           #
+           abilist="mode64 mode32 $abilist"
+           gcc_32_cflags_maybe="-m32"
+           gcc_cflags_opt="-O3 -O2 -O1"        # will this become used?
+           cclist_mode32="gcc"
+           gcc_mode32_cflags_maybe="-m32"
+           gcc_mode32_cflags="-mpowerpc64"
+           gcc_mode32_cflags_optlist="subtype cpu opt"
+           gcc_mode32_cflags_subtype="-force_cpusubtype_ALL"
+           gcc_mode32_cflags_opt="-O3 -O2 -O1"
+           limb_mode32=longlong
+           cclist_mode64="gcc"
+           gcc_mode64_cflags="-m64"
+           gcc_mode64_cflags_optlist="cpu opt"
+           gcc_mode64_cflags_opt="-O3 -O2 -O1"
+           path_mode64=""
+           path_mode32=""
+           p=""
+           for i in $cpu_path
+             do path_mode64="${path_mode64}powerpc64/mode64/$i "
+                path_mode64="${path_mode64}powerpc64/$i "
+                path_mode32="${path_mode32}powerpc64/mode32/$i "
+                path_mode32="${path_mode32}powerpc64/$i "
+                p="${p} powerpc32/$i "
+             done
+           path_mode64="${path_mode64}powerpc64/mode64 $vmx_path powerpc64"
+           path_mode32="${path_mode32}powerpc64/mode32 $vmx_path powerpc64"
+           path="$p $path"
+           SPEED_CYCLECOUNTER_OBJ_mode64=powerpc64.lo
+           cyclecounter_size_mode64=0
+           any_mode64_testlist="sizeof-long-8"
+           ;;
+         *-*-linux* | *-*-*bsd*)
+           # On GNU/Linux, assume the processor is in 64-bit mode.  Some
+           # environments have a gcc that is always in 64-bit mode, while
+           # others require -m64, hence the use of cflags_maybe.  The
+           # sizeof-long-8 test checks the mode is right (for the no option
+           # case).
+           #
+           # -mpowerpc64 is not used, since it should be the default in
+           # 64-bit mode.  (We need its effect for the various longlong.h
+           # asm macros to be right of course.)
+           #
+           # gcc64 was an early port of gcc to 64-bit mode, but should be
+           # obsolete before too long.  We prefer plain gcc when it knows
+           # 64-bits.
+           #
+           abilist="mode64 mode32 $abilist"
+           gcc_32_cflags_maybe="-m32"
+           cclist_mode32="gcc"
+           gcc_mode32_cflags_maybe="-m32"
+           gcc_mode32_cflags="-mpowerpc64"
+           gcc_mode32_cflags_optlist="cpu opt"
+           gcc_mode32_cflags_opt="-O3 -O2 -O1"
+           limb_mode32=longlong
+           cclist_mode64="gcc gcc64"
+           gcc_mode64_cflags_maybe="-m64"
+           gcc_mode64_cflags_optlist="cpu opt"
+           gcc_mode64_cflags_opt="-O3 -O2 -O1"
+           path_mode64=""
+           path_mode32=""
+           p=""
+           for i in $cpu_path
+             do path_mode64="${path_mode64}powerpc64/mode64/$i "
+                path_mode64="${path_mode64}powerpc64/$i "
+                path_mode32="${path_mode32}powerpc64/mode32/$i "
+                path_mode32="${path_mode32}powerpc64/$i "
+                p="${p} powerpc32/$i "
+             done
+           path_mode64="${path_mode64}powerpc64/mode64 $vmx_path powerpc64"
+           path_mode32="${path_mode32}powerpc64/mode32 $vmx_path powerpc64"
+           path="$p $path"
+           SPEED_CYCLECOUNTER_OBJ_mode64=powerpc64.lo
+           cyclecounter_size_mode64=0
+           any_mode64_testlist="sizeof-long-8"
+           ;;
+       esac
+       ;;
+    esac
+    ;;
+
+
+  # POWER 32-bit
+  [power-*-* | power[12]-*-* | power2sc-*-*])
+    AC_DEFINE(HAVE_HOST_CPU_FAMILY_power)
+    HAVE_HOST_CPU_FAMILY_power=1
+    cclist="gcc"
+    extra_functions="udiv_w_sdiv"
+    path="power"
+
+    # gcc 2.7.2 knows rios1, rios2, rsc
+    #
+    # -mcpu=rios2 can tickle an AIX assembler bug (see GMP_PROG_CC_WORKS) so
+    # there needs to be a fallback to just -mpower.
+    #
+    gcc_cflags_optlist="cpu"
+    case $host in
+      power-*-*)    gcc_cflags_cpu="-mcpu=power -mpower" ;;
+      power1-*-*)   gcc_cflags_cpu="-mcpu=rios1 -mpower" ;;
+      power2-*-*)   gcc_cflags_cpu="-mcpu=rios2 -mpower" ;;
+      power2sc-*-*) gcc_cflags_cpu="-mcpu=rsc   -mpower" ;;
+    esac
+    case $host in
+    *-*-aix*)
+      cclist="gcc xlc"
+      xlc_cflags="-O2 -qarch=pwr -qmaxmem=20000"
+      ;;
+    esac
+    ;;
+
+
+  # IBM System/390 and z/Architecture
+  S390_PATTERN | S390X_PATTERN)
+    abilist="32"
+    gcc_cflags="$gcc_cflags $fomit_frame_pointer"
+    gcc_cflags_optlist="arch"
+    path="s390_32"
+    extra_functions="udiv_w_sdiv"
+    gcc_32_cflags_maybe="-m31"
+
+    case $host_cpu in
+      s390)
+       ;;
+      z900 | z900esa)
+        cpu="z900"
+        gccarch="$cpu"
+       path="s390_32/esame/$cpu s390_32/esame s390_32"
+       gcc_cflags_arch="-march=$gccarch"
+       AC_DEFINE_UNQUOTED(HAVE_HOST_CPU_s390_$cpu)
+       AC_DEFINE(HAVE_HOST_CPU_s390_zarch)
+       extra_functions=""
+        ;;
+      z990 | z990esa)
+        cpu="z990"
+        gccarch="$cpu"
+       path="s390_32/esame/$cpu s390_32/esame s390_32"
+       gcc_cflags_arch="-march=$gccarch"
+       AC_DEFINE_UNQUOTED(HAVE_HOST_CPU_s390_$cpu)
+       AC_DEFINE(HAVE_HOST_CPU_s390_zarch)
+       extra_functions=""
+        ;;
+      z9 | z9esa)
+        cpu="z9"
+       gccarch="z9-109"
+       path="s390_32/esame/$cpu s390_32/esame s390_32"
+       gcc_cflags_arch="-march=$gccarch"
+       AC_DEFINE_UNQUOTED(HAVE_HOST_CPU_s390_$cpu)
+       AC_DEFINE(HAVE_HOST_CPU_s390_zarch)
+       extra_functions=""
+        ;;
+      z10 | z10esa)
+        cpu="z10"
+       gccarch="z10"
+       path="s390_32/esame/$cpu s390_32/esame s390_32"
+       gcc_cflags_arch="-march=$gccarch"
+       AC_DEFINE_UNQUOTED(HAVE_HOST_CPU_s390_$cpu)
+       AC_DEFINE(HAVE_HOST_CPU_s390_zarch)
+       extra_functions=""
+        ;;
+      z196 | z196esa)
+        cpu="z196"
+       gccarch="z196"
+       path="s390_32/esame/$cpu s390_32/esame s390_32"
+       gcc_cflags_arch="-march=$gccarch"
+       AC_DEFINE_UNQUOTED(HAVE_HOST_CPU_s390_$cpu)
+       AC_DEFINE(HAVE_HOST_CPU_s390_zarch)
+       extra_functions=""
+        ;;
+      esac
+
+    case $host in
+      S390X_PATTERN)
+       abilist="64 32"
+       cclist_64="gcc"
+       gcc_64_cflags_optlist="arch"
+       gcc_64_cflags="$gcc_cflags -m64"
+       path_64="s390_64/$host_cpu s390_64"
+       extra_functions=""
+       ;;
+      esac
+    ;;
+
+
+  sh-*-*)   path="sh" ;;
+  [sh[2-4]-*-*])  path="sh/sh2 sh" ;;
+
+
+  *sparc*-*-*)
+    # sizeof(long)==4 or 8 is tested, to ensure we get the right ABI.  We've
+    # had various bug reports where users have set CFLAGS for their desired
+    # mode, but not set our ABI.  For some reason it's sparc where this
+    # keeps coming up, presumably users there are accustomed to driving the
+    # compiler mode that way.  The effect of our testlist setting is to
+    # reject ABI=64 in favour of ABI=32 if the user has forced the flags to
+    # 32-bit mode.
+    #
+    abilist="32"
+    cclist="gcc acc cc"
+    any_testlist="sizeof-long-4"
+    GMP_INCLUDE_MPN(sparc32/sparc-defs.m4)
+
+    case $host_cpu in
+      sparcv8 | microsparc | turbosparc)
+        path="sparc32/v8 sparc32" ;;
+      supersparc)
+        path="sparc32/v8/supersparc sparc32/v8 sparc32" ;;
+      [sparc64 | sparcv9* | ultrasparc | ultrasparc[234]*])
+        path="sparc32/v9 sparc32/v8 sparc32" ;;
+      [ultrasparct[12345]])
+        path="sparc32/ultrasparct1 sparc32/v8 sparc32" ;;
+      *)
+        path="sparc32" ;;
+    esac
+
+    # gcc 2.7.2 doesn't know about v9 and doesn't pass -xarch=v8plus to the
+    # assembler.  Add it explicitly since the solaris assembler won't accept
+    # our sparc32/v9 asm code without it.  gas accepts -xarch=v8plus too, so
+    # it can be in the cflags unconditionally (though gas doesn't need it).
+    #
+    # gcc -m32 is needed to force 32-bit mode on a dual-ABI system, but past
+    # gcc doesn't know that flag, hence cflags_maybe.  Note that -m32 cannot
+    # be done through the optlist since the plain cflags would be run first
+    # and we don't want to require the default mode (whatever it is) works.
+    #
+    # Note it's gcc_32_cflags_maybe and not gcc_cflags_maybe because the
+    # latter would be used in the 64-bit ABI on systems like "*bsd" where
+    # abilist="64" only.
+    #
+    gcc_32_cflags_maybe="-m32"
+    gcc_cflags_optlist="cpu asm"
+
+    # gcc 2.7.2 knows -mcypress, -msupersparc, -mv8, -msparclite.
+    # gcc 2.95 knows -mcpu= v7, hypersparc, sparclite86x, f930, f934,
+    #   sparclet, tsc701, v9, ultrasparc.  A warning is given that the
+    #   plain -m forms will disappear.
+    # gcc 3.3 adds ultrasparc3.
+    #
+    case $host_cpu in
+      supersparc*)
+                       gcc_cflags_cpu="-mcpu=supersparc -msupersparc"
+                       gcc_cflags_asm="-Wa,-Av8 -Wa,-xarch=v8";;
+      sparcv8 | microsparc* | turbosparc | hypersparc*)
+                       gcc_cflags_cpu="-mcpu=v8 -mv8"
+                       gcc_cflags_asm="-Wa,-Av8 -Wa,-xarch=v8";;
+      sparc64 | sparcv9*)
+                       gcc_cflags_cpu="-mcpu=v9"
+                       gcc_32_cflags_asm="-Wa,-Av8 -Wa,-xarch=v8plus"
+                       gcc_64_cflags_asm="-Wa,-Av9 -Wa,-xarch=v9";;
+      ultrasparc1 | ultrasparc2*)
+                       gcc_cflags_cpu="-mcpu=ultrasparc -mcpu=v9"
+                       gcc_32_cflags_asm="-Wa,-Av8plusa -Wa,-xarch=v8plusa"
+                       gcc_64_cflags_asm="-Wa,-Av9a -Wa,-xarch=v9a";;
+      [ultrasparc[34]])
+                       gcc_cflags_cpu="-mcpu=ultrasparc3 -mcpu=ultrasparc -mcpu=v9"
+                       gcc_32_cflags_asm="-Wa,-Av8plusb -Wa,-xarch=v8plusb"
+                       gcc_64_cflags_asm="-Wa,-Av9b -Wa,-xarch=v9b";;
+      [ultrasparct[12]])
+                       gcc_cflags_cpu="-mcpu=niagara -mcpu=v9"
+                       gcc_32_cflags_asm="-Wa,-Av8plusc -Wa,-xarch=v8plusc"
+                       gcc_64_cflags_asm="-Wa,-Av9c -Wa,-xarch=v9c";;
+      ultrasparct3)
+                       gcc_cflags_cpu="-mcpu=niagara3 -mcpu=niagara -mcpu=v9"
+                       gcc_32_cflags_asm="-Wa,-Av8plusd -Wa,-xarch=v8plusd"
+                       gcc_64_cflags_asm="-Wa,-Av9d -Wa,-xarch=v9d";;
+      ultrasparct4)
+                       gcc_cflags_cpu="-mcpu=niagara4 -mcpu=niagara3 -mcpu=niagara -mcpu=v9"
+                       gcc_32_cflags_asm="-Wa,-Av8plusd -Wa,-xarch=v8plusd"
+                       gcc_64_cflags_asm="-Wa,-Av9d -Wa,-xarch=v9d";;
+      *)
+                       gcc_cflags_cpu="-mcpu=v7 -mcypress"
+                       gcc_cflags_asm="";;
+    esac
+
+    # SunPRO cc and acc, and SunOS bundled cc
+    case $host in
+      *-*-solaris* | *-*-sunos*)
+       # Note no -g, it disables all optimizations.
+       cc_cflags=
+       cc_cflags_optlist="opt arch cpu"
+
+        # SunOS cc doesn't know -xO4, fallback to -O2.
+       cc_cflags_opt="-xO4 -O2"
+
+        # SunOS cc doesn't know -xarch, apparently always generating v7
+        # code, so make this optional
+       case $host_cpu in
+         sparcv8 | microsparc* | supersparc* | turbosparc | hypersparc*)
+                       cc_cflags_arch="-xarch=v8";;
+          [ultrasparct[345]])
+                       cc_cflags_arch="-xarch=v8plusd" ;;
+         sparc64 | sparcv9* | ultrasparc*)
+                       cc_cflags_arch="-xarch=v8plus" ;;
+         *)
+                       cc_cflags_arch="-xarch=v7" ;;
+       esac
+
+        # SunOS cc doesn't know -xchip and doesn't seem to have an equivalent.
+       # SunPRO cc 5 recognises -xchip=generic, old, super, super2, micro,
+       #   micro2, hyper, hyper2, powerup, ultra, ultra2, ultra2i.
+       # SunPRO cc 6 adds -xchip=ultra2e, ultra3cu.
+        #
+       case $host_cpu in
+         supersparc*)  cc_cflags_cpu="-xchip=super" ;;
+         microsparc*)  cc_cflags_cpu="-xchip=micro" ;;
+         turbosparc)   cc_cflags_cpu="-xchip=micro2" ;;
+         hypersparc*)  cc_cflags_cpu="-xchip=hyper" ;;
+         ultrasparc)   cc_cflags_cpu="-xchip=ultra" ;;
+         ultrasparc2)  cc_cflags_cpu="-xchip=ultra2 -xchip=ultra" ;;
+         ultrasparc2i) cc_cflags_cpu="-xchip=ultra2i -xchip=ultra2 -xchip=ultra" ;;
+         ultrasparc3)  cc_cflags_cpu="-xchip=ultra3 -xchip=ultra" ;;
+         ultrasparc4)  cc_cflags_cpu="-xchip=ultra4 -xchip=ultra3 -xchip=ultra" ;;
+         ultrasparct1) cc_cflags_cpu="-xchip=ultraT1" ;;
+         ultrasparct2) cc_cflags_cpu="-xchip=ultraT2 -xchip=ultraT1" ;;
+         ultrasparct3) cc_cflags_cpu="-xchip=ultraT3 -xchip=ultraT2" ;;
+         ultrasparct4) cc_cflags_cpu="-xchip=T4" ;;
+         ultrasparct5) cc_cflags_cpu="-xchip=T5 -xchip=T4" ;;
+         *)            cc_cflags_cpu="-xchip=generic" ;;
+       esac
+    esac
+
+    case $host_cpu in
+      sparc64 | sparcv9* | ultrasparc*)
+        case $host in
+          # Solaris 6 and earlier cannot run ABI=64 since it doesn't save
+          # registers properly, so ABI=32 is left as the only choice.
+          #
+          [*-*-solaris2.[0-6] | *-*-solaris2.[0-6].*]) ;;
+
+          # BSD sparc64 ports are 64-bit-only systems, so ABI=64 is the only
+          # choice.  In fact they need no special compiler flags, gcc -m64
+          # is the default, but it doesn't hurt to add it.  v9 CPUs always
+          # use the sparc64 port, since the plain 32-bit sparc ports don't
+          # run on a v9.
+          #
+          *-*-*bsd*) abilist="64" ;;
+
+          # For all other systems, we try both 64 and 32.
+          #
+          # GNU/Linux sparc64 has only recently gained a 64-bit user mode.
+          # In the past sparc64 meant a v9 cpu, but there were no 64-bit
+          # operations in user mode.  We assume that if "gcc -m64" works
+          # then the system is suitable.  Hopefully even if someone attempts
+          # to put a new gcc and/or glibc on an old system it won't run.
+          #
+          *) abilist="64 32" ;;
+        esac
+
+       case $host_cpu in
+         ultrasparc | ultrasparc2 | ultrasparc2i)
+           path_64="sparc64/ultrasparc1234 sparc64" ;;
+         [ultrasparc[34]])
+           path_64="sparc64/ultrasparc34 sparc64/ultrasparc1234 sparc64" ;;
+         [ultrasparct[12]])
+           path_64="sparc64/ultrasparct1 sparc64" ;;
+         [ultrasparct[345]])
+           path_64="sparc64/ultrasparct3 sparc64" ;;
+         *)
+           path_64="sparc64"
+       esac
+
+        cclist_64="gcc"
+        any_64_testlist="sizeof-long-8"
+
+        # gcc -mptr64 is probably implied by -m64, but we're not sure if
+        # this was always so.  On Solaris in the past we always used both
+        # "-m64 -mptr64".
+        #
+        # gcc -Wa,-xarch=v9 is thought to be necessary in some cases on
+        # solaris, but it would seem likely that if gcc is going to generate
+        # 64-bit code it will have to add that option itself where needed.
+        # An extra copy of this option should be harmless though, but leave
+        # it until we're sure.  (Might want -xarch=v9a or -xarch=v9b for the
+        # higher cpu types instead.)
+        #
+        gcc_64_cflags="$gcc_cflags -m64 -mptr64"
+        gcc_64_ldflags="-Wc,-m64"
+        gcc_64_cflags_optlist="cpu asm"
+
+        case $host in
+          *-*-solaris*)
+            # Sun cc.
+            #
+            # We used to have -fast and some fixup options here, but it
+            # recurrently caused problems with miscompilation.  Of course,
+            # -fast is documented as miscompiling things for the sake of speed.
+            #
+            cclist_64="$cclist_64 cc"
+            cc_64_cflags_optlist="cpu"
+            case $host_cpu in
+              [ultrasparct[345]])
+                cc_64_cflags="$cc_64_cflags -xO3 -xarch=v9d" ;;
+              *)
+                cc_64_cflags="-xO3 -xarch=v9" ;;
+            esac
+            ;;
+        esac
+
+        # using the v9 %tick register
+        SPEED_CYCLECOUNTER_OBJ_32=sparcv9.lo
+        SPEED_CYCLECOUNTER_OBJ_64=sparcv9.lo
+        cyclecounter_size_32=2
+        cyclecounter_size_64=2
+        ;;
+    esac
+    ;;
+
+
+  # VAX
+  vax*-*-*elf*)
+    # Use elf conventions (i.e., '%' register prefix, no global prefix)
+    #
+    GMP_INCLUDE_MPN(vax/elf.m4)
+    gcc_cflags="$gcc_cflags $fomit_frame_pointer"
+    path="vax"
+    extra_functions="udiv_w_sdiv"
+    ;;
+  vax*-*-*)
+    # Default to aout conventions (i.e., no register prefix, '_' global prefix)
+    #
+    gcc_cflags="$gcc_cflags $fomit_frame_pointer"
+    path="vax"
+    extra_functions="udiv_w_sdiv"
+    ;;
+
+
+  # AMD and Intel x86 configurations, including AMD64
+  #
+  # Rumour has it gcc -O2 used to give worse register allocation than just
+  # -O, but lets assume that's no longer true.
+  #
+  # -m32 forces 32-bit mode on a bi-arch 32/64 amd64 build of gcc.  -m64 is
+  # the default in such a build (we think), so -m32 is essential for ABI=32.
+  # This is, of course, done for any $host_cpu, not just x86_64, so we can
+  # get such a gcc into the right mode to cross-compile to say i486-*-*.
+  #
+  # -m32 is not available in gcc 2.95 and earlier, hence cflags_maybe to use
+  # it when it works.  We check sizeof(long)==4 to ensure we get the right
+  # mode, in case -m32 has failed not because it's an old gcc, but because
+  # it's a dual 32/64-bit gcc without a 32-bit libc, or whatever.
+  #
+  X86_PATTERN | X86_64_PATTERN)
+    abilist="32"
+    cclist="gcc icc cc"
+    gcc_cflags="$gcc_cflags $fomit_frame_pointer"
+    gcc_32_cflags_maybe="-m32"
+    icc_cflags="-no-gcc"
+    icc_cflags_optlist="opt"
+    icc_cflags_opt="-O3 -O2 -O1"
+    any_32_testlist="sizeof-long-4"
+    CALLING_CONVENTIONS_OBJS='x86call.lo x86check$U.lo'
+
+    # Availability of rdtsc is checked at run-time.
+    SPEED_CYCLECOUNTER_OBJ=pentium.lo
+
+    # gcc 2.7.2 only knows i386 and i486, using -m386 or -m486.  These
+    #     represent -mcpu= since -m486 doesn't generate 486 specific insns.
+    # gcc 2.95 adds k6, pentium and pentiumpro, and takes -march= and -mcpu=.
+    # gcc 3.0 adds athlon.
+    # gcc 3.1 adds k6-2, k6-3, pentium-mmx, pentium2, pentium3, pentium4,
+    #     athlon-tbird, athlon-4, athlon-xp, athlon-mp.
+    # gcc 3.2 adds winchip2.
+    # gcc 3.3 adds winchip-c6.
+    # gcc 3.3.1 from mandrake adds k8 and knows -mtune.
+    # gcc 3.4 adds c3, c3-2, k8, and deprecates -mcpu in favour of -mtune.
+    #
+    # In gcc 2.95.[0123], -march=pentiumpro provoked a stack slot bug in an
+    # old version of mpz/powm.c.  Seems to be fine with the current code, so
+    # no need for any restrictions on that option.
+    #
+    # -march=pentiumpro can fail if the assembler doesn't know "cmov"
+    # (eg. solaris 2.8 native "as"), so always have -march=pentium after
+    # that as a fallback.
+    #
+    # -march=pentium4 and -march=k8 enable SSE2 instructions, which may or
+    # may not be supported by the assembler and/or the OS, and is bad in gcc
+    # prior to 3.3.  The tests will reject these if no good, so fallbacks
+    # like "-march=pentium4 -mno-sse2" are given to try also without SSE2.
+    # Note the relevant -march types are listed in the optflags handling
+    # below, be sure to update there if adding new types emitting SSE2.
+    #
+    # -mtune is used at the start of each cpu option list to give something
+    # gcc 3.4 will use, thereby avoiding warnings from -mcpu.  -mcpu forms
+    # are retained for use by prior gcc.  For example pentium has
+    # "-mtune=pentium -mcpu=pentium ...", the -mtune is for 3.4 and the
+    # -mcpu for prior.  If there's a brand new choice in 3.4 for a chip,
+    # like k8 for x86_64, then it can be the -mtune at the start, no need to
+    # duplicate anything.
+    #
+    gcc_cflags_optlist="cpu arch"
+    case $host_cpu in
+      i386*)
+       gcc_cflags_cpu="-mtune=i386 -mcpu=i386 -m386"
+       gcc_cflags_arch="-march=i386"
+       path="x86"
+       ;;
+      i486*)
+       gcc_cflags_cpu="-mtune=i486 -mcpu=i486 -m486"
+       gcc_cflags_arch="-march=i486"
+       path="x86/i486 x86"
+       ;;
+      i586 | pentium)
+       gcc_cflags_cpu="-mtune=pentium -mcpu=pentium -m486"
+       gcc_cflags_arch="-march=pentium"
+       path="x86/pentium x86"
+       ;;
+      pentiummmx)
+       gcc_cflags_cpu="-mtune=pentium-mmx -mcpu=pentium-mmx -mcpu=pentium -m486"
+       gcc_cflags_arch="-march=pentium-mmx -march=pentium"
+       path="x86/pentium/mmx x86/pentium x86/mmx x86"
+       ;;
+      i686 | pentiumpro)
+       gcc_cflags_cpu="-mtune=pentiumpro -mcpu=pentiumpro -mcpu=i486 -m486"
+       gcc_cflags_arch="-march=pentiumpro -march=pentium"
+       path="x86/p6 x86"
+       ;;
+      pentium2)
+       gcc_cflags_cpu="-mtune=pentium2 -mcpu=pentium2 -mcpu=pentiumpro -mcpu=i486 -m486"
+       gcc_cflags_arch="-march=pentium2 -march=pentiumpro -march=pentium"
+       path="x86/p6/mmx x86/p6 x86/mmx x86"
+       ;;
+      pentium3)
+       gcc_cflags_cpu="-mtune=pentium3 -mcpu=pentium3 -mcpu=pentiumpro -mcpu=i486 -m486"
+       gcc_cflags_arch="-march=pentium3 -march=pentiumpro -march=pentium"
+       path="x86/p6/p3mmx x86/p6/mmx x86/p6 x86/mmx x86"
+       ;;
+      pentiumm)
+       gcc_cflags_cpu="-mtune=pentium3 -mcpu=pentium3 -mcpu=pentiumpro -mcpu=i486 -m486"
+       gcc_cflags_arch="-march=pentium3 -march=pentiumpro -march=pentium"
+       path="x86/p6/sse2 x86/p6/p3mmx x86/p6/mmx x86/p6 x86/mmx x86"
+       ;;
+      k6)
+       gcc_cflags_cpu="-mtune=k6 -mcpu=k6 -mcpu=i486 -m486"
+       gcc_cflags_arch="-march=k6"
+       path="x86/k6/mmx x86/k6 x86/mmx x86"
+       ;;
+      k62)
+       gcc_cflags_cpu="-mtune=k6-2 -mcpu=k6-2 -mcpu=k6 -mcpu=i486 -m486"
+       gcc_cflags_arch="-march=k6-2 -march=k6"
+       path="x86/k6/k62mmx x86/k6/mmx x86/k6 x86/mmx x86"
+       ;;
+      k63)
+       gcc_cflags_cpu="-mtune=k6-3 -mcpu=k6-3 -mcpu=k6 -mcpu=i486 -m486"
+       gcc_cflags_arch="-march=k6-3 -march=k6"
+       path="x86/k6/k62mmx x86/k6/mmx x86/k6 x86/mmx x86"
+       ;;
+      geode)
+       gcc_cflags_cpu="-mtune=k6-3 -mcpu=k6-3 -mcpu=k6 -mcpu=i486 -m486"
+       gcc_cflags_arch="-march=k6-3 -march=k6"
+       path="x86/geode x86/k6/k62mmx x86/k6/mmx x86/k6 x86/mmx x86"
+       ;;
+      athlon)
+       # Athlon instruction costs are close to P6 (3 cycle load latency,
+       # 4-6 cycle mul, 40 cycle div, pairable adc, etc) so if gcc doesn't
+       # know athlon (eg. 2.95.2 doesn't) then fall back on pentiumpro.
+       gcc_cflags_cpu="-mtune=athlon -mcpu=athlon -mcpu=pentiumpro -mcpu=i486 -m486"
+       gcc_cflags_arch="-march=athlon -march=pentiumpro -march=pentium"
+       path="x86/k7/mmx x86/k7 x86/mmx x86"
+       ;;
+      i786 | pentium4)
+       # pentiumpro is the primary fallback when gcc doesn't know pentium4.
+       # This gets us cmov to eliminate branches.  Maybe "athlon" would be
+       # a possibility on gcc 3.0.
+       #
+       gcc_cflags_cpu="-mtune=pentium4 -mcpu=pentium4 -mcpu=pentiumpro -mcpu=i486 -m486"
+       gcc_cflags_arch="-march=pentium4 -march=pentium4~-mno-sse2 -march=pentiumpro -march=pentium"
+       gcc_64_cflags_cpu="-mtune=nocona"
+       path="x86/pentium4/sse2 x86/pentium4/mmx x86/pentium4 x86/mmx x86"
+       path_64="x86_64/pentium4 x86_64"
+       ;;
+      viac32)
+       # Not sure of the best fallbacks here for -mcpu.
+       # c3-2 has sse and mmx, so pentium3 is good for -march.
+       gcc_cflags_cpu="-mtune=c3-2 -mcpu=c3-2 -mcpu=i486 -m486"
+       gcc_cflags_arch="-march=c3-2 -march=pentium3 -march=pentiumpro -march=pentium"
+       path="x86/p6/p3mmx x86/p6/mmx x86/p6 x86/mmx x86"
+       ;;
+      viac3*)
+       # Not sure of the best fallbacks here.
+       gcc_cflags_cpu="-mtune=c3 -mcpu=c3 -mcpu=i486 -m486"
+       gcc_cflags_arch="-march=c3 -march=pentium-mmx -march=pentium"
+       path="x86/pentium/mmx x86/pentium x86/mmx x86"
+       ;;
+      athlon64 | k8 | x86_64)
+       gcc_cflags_cpu="-mtune=k8 -mcpu=athlon -mcpu=pentiumpro -mcpu=i486 -m486"
+       gcc_cflags_arch="-march=k8 -march=k8~-mno-sse2 -march=athlon -march=pentiumpro -march=pentium"
+       path="x86/k8 x86/k7/mmx x86/k7 x86/mmx x86"
+       path_64="x86_64/k8 x86_64"
+       ;;
+      k10)
+       gcc_cflags_cpu="-mtune=amdfam10 -mtune=k8"
+       gcc_cflags_arch="-march=amdfam10 -march=k8 -march=k8~-mno-sse2"
+       path="x86/k10 x86/k8 x86/k7/mmx x86/k7 x86/mmx x86"
+       path_64="x86_64/k10 x86_64/k8 x86_64"
+       ;;
+      bobcat)
+       gcc_cflags_cpu="-mtune=btver1 -mtune=amdfam10 -mtune=k8"
+       gcc_cflags_arch="-march=btver1 -march=amdfam10 -march=k8 -march=k8~-mno-sse2"
+       path="x86/bobcat x86/k7/mmx x86/k7 x86/mmx x86"
+       path_64="x86_64/bobcat x86_64/k10 x86_64/k8 x86_64"
+       ;;
+      jaguar)
+       gcc_cflags_cpu="-mtune=btver2 -mtune=btver1 -mtune=amdfam10 -mtune=k8"
+       gcc_cflags_arch="-march=btver2 -march=btver1 -march=amdfam10 -march=k8 -march=k8~-mno-sse2"
+       path="x86/jaguar x86/bobcat x86/k7/mmx x86/k7 x86/mmx x86"
+       path_64="x86_64/jaguar x86_64/bobcat x86_64/k10 x86_64/k8 x86_64"
+       ;;
+      bulldozer | bd1)
+       gcc_cflags_cpu="-mtune=bdver1 -mtune=amdfam10 -mtune=k8"
+       gcc_cflags_arch="-march=bdver1 -march=amdfam10 -march=k8 -march=k8~-mno-sse2"
+       path="x86/bd1 x86/k7/mmx x86/k7 x86/mmx x86"
+       path_64="x86_64/bd1 x86_64/k10 x86_64/k8 x86_64"
+       ;;
+      piledriver | bd2)
+       gcc_cflags_cpu="-mtune=bdver2 -mtune=bdver1 -mtune=amdfam10 -mtune=k8"
+       gcc_cflags_arch="-march=bdver2 -march=bdver1 -march=amdfam10 -march=k8 -march=k8~-mno-sse2"
+       path="x86/bd2 x86/bd1 x86/k7/mmx x86/k7 x86/mmx x86"
+       path_64="x86_64/bd2 x86_64/bd1 x86_64/k10 x86_64/k8 x86_64"
+       ;;
+      steamroller | bd3)
+       gcc_cflags_cpu="-mtune=bdver3 -mtune=bdver2 -mtune=bdver1 -mtune=amdfam10 -mtune=k8"
+       gcc_cflags_arch="-march=bdver3 -march=bdver2 -march=bdver1 -march=amdfam10 -march=k8 -march=k8~-mno-sse2"
+       path="x86/bd3 x86/bd2 x86/bd1 x86/k7/mmx x86/k7 x86/mmx x86"
+       path_64="x86_64/bd3 x86_64/bd2 x86_64/bd1 x86_64/k10 x86_64/k8 x86_64"
+       ;;
+      excavator | bd4)
+       gcc_cflags_cpu="-mtune=bdver4 -mtune=bdver3 -mtune=bdver2 -mtune=bdver1 -mtune=amdfam10 -mtune=k8"
+       gcc_cflags_arch="-march=bdver4 -march=bdver3 -march=bdver2 -march=bdver1 -march=amdfam10 -march=k8 -march=k8~-mno-sse2"
+       path="x86/bd4 x86/bd3 x86/bd2 x86/bd1 x86/k7/mmx x86/k7 x86/mmx x86"
+       path_64="x86_64/bd4 x86_64/bd3 x86_64/bd2 x86_64/bd1 x86_64/k10 x86_64/k8 x86_64"
+       ;;
+      core2)
+       gcc_cflags_cpu="-mtune=core2 -mtune=k8"
+       gcc_cflags_arch="-march=core2 -march=core2~-mno-sse2 -march=k8 -march=k8~-mno-sse2"
+       path="x86/core2 x86/p6/sse2 x86/p6/p3mmx x86/p6/mmx x86/p6 x86/mmx x86"
+       path_64="x86_64/core2 x86_64"
+       ;;
+      corei | coreinhm | coreiwsm)
+       gcc_cflags_cpu="-mtune=corei7 -mtune=core2 -mtune=k8"
+       gcc_cflags_arch="-march=corei7 -march=core2 -march=core2~-mno-sse2 -march=k8 -march=k8~-mno-sse2"
+       path="x86/coreinhm x86/p6/sse2 x86/p6/p3mmx x86/p6/mmx x86/p6 x86/mmx x86"
+       path_64="x86_64/coreinhm x86_64/core2 x86_64"
+       ;;
+      coreisbr)
+       gcc_cflags_cpu="-mtune=corei7 -mtune=core2 -mtune=k8"
+       gcc_cflags_arch="-march=corei7 -march=core2 -march=core2~-mno-sse2 -march=k8 -march=k8~-mno-sse2"
+       path="x86/coreisbr x86/p6/sse2 x86/p6/p3mmx x86/p6/mmx x86/p6 x86/mmx x86"
+       path_64="x86_64/coreisbr x86_64/coreinhm x86_64/core2 x86_64"
+       ;;
+      coreihwl)
+       gcc_cflags_cpu="-mtune=corei7 -mtune=core2 -mtune=k8"
+       gcc_cflags_arch="-march=corei7 -march=core2 -march=core2~-mno-sse2 -march=k8 -march=k8~-mno-sse2"
+       path="x86/coreisbr x86/p6/sse2 x86/p6/p3mmx x86/p6/mmx x86/p6 x86/mmx x86"
+       path_64="x86_64/coreihwl x86_64/coreisbr x86_64/coreinhm x86_64/core2 x86_64"
+       ;;
+      coreibwl)
+       gcc_cflags_cpu="-mtune=corei7 -mtune=core2 -mtune=k8"
+       gcc_cflags_arch="-march=corei7 -march=core2 -march=core2~-mno-sse2 -march=k8 -march=k8~-mno-sse2"
+       path="x86/coreisbr x86/p6/sse2 x86/p6/p3mmx x86/p6/mmx x86/p6 x86/mmx x86"
+       path_64="x86_64/coreihwl x86_64/coreisbr x86_64/coreinhm x86_64/core2 x86_64"
+       # extra_functions_64="missing"   # enable for bmi2/adx simulation
+       ;;
+      atom)
+       gcc_cflags_cpu="-mtune=atom -mtune=pentium3"
+       gcc_cflags_arch="-march=atom -march=pentium3"
+       path="x86/atom/sse2 x86/atom/mmx x86/atom x86/mmx x86"
+       path_64="x86_64/atom x86_64"
+       ;;
+      nano)
+       gcc_cflags_cpu="-mtune=nano"
+       gcc_cflags_arch="-march=nano"
+       path="x86/nano x86/mmx x86"
+       path_64="x86_64/nano x86_64"
+       ;;
+      *)
+       gcc_cflags_cpu="-mtune=i486 -mcpu=i486 -m486"
+       gcc_cflags_arch="-march=i486"
+       path="x86"
+       path_64="x86_64"
+       ;;
+    esac
+
+    case $host in
+      X86_64_PATTERN)
+       cclist_64="gcc cc"
+       gcc_64_cflags="$gcc_cflags -m64"
+       gcc_64_cflags_optlist="cpu arch"
+       CALLING_CONVENTIONS_OBJS_64='amd64call.lo amd64check$U.lo'
+       SPEED_CYCLECOUNTER_OBJ_64=x86_64.lo
+       cyclecounter_size_64=2
+
+       cclist_x32="gcc cc"
+       gcc_x32_cflags="$gcc_cflags -mx32"
+       gcc_x32_cflags_optlist="$gcc_64_cflags_optlist"
+       CALLING_CONVENTIONS_OBJS_x32="$CALLING_CONVENTIONS_OBJS_64"
+       SPEED_CYCLECOUNTER_OBJ_x32="$SPEED_CYCLECOUNTER_OBJ_64"
+       cyclecounter_size_x32="$cyclecounter_size_64"
+       path_x32="$path_64"
+       limb_x32=longlong
+       any_x32_testlist="sizeof-long-4"
+
+       abilist="64 x32 32"
+       if test "$enable_assembly" = "yes" ; then
+           extra_functions_64="$extra_functions_64 invert_limb_table"
+           extra_functions_x32=$extra_functions_64
+       fi
+
+       case $host in
+         *-*-solaris*)
+           # Sun cc.
+           cc_64_cflags="-xO3 -m64"
+           ;;
+         *-*-mingw* | *-*-cygwin)
+           limb_64=longlong
+           CALLING_CONVENTIONS_OBJS_64=""
+           AC_DEFINE(HOST_DOS64,1,[Define to 1 for Windos/64])
+           GMP_NONSTD_ABI_64=DOS64
+           ;;
+       esac
+       ;;
+    esac
+    ;;
+
+
+  # Special CPU "none" used to select generic C, now this is obsolete.
+  none-*-*)
+    enable_assembly=no
+    AC_MSG_WARN([the \"none\" host is obsolete, use --disable-assembly])
+    ;;
+
+esac
+
+# mingw can be built by the cygwin gcc if -mno-cygwin is added.  For
+# convenience add this automatically if it works.  Actual mingw gcc accepts
+# -mno-cygwin too, but of course is the default.  mingw only runs on the
+# x86s, but allow any CPU here so as to catch "none" too.
+#
+case $host in
+  *-*-mingw*)
+    gcc_cflags_optlist="$gcc_cflags_optlist nocygwin"
+    gcc_cflags_nocygwin="-mno-cygwin"
+    ;;
+esac
+
+
+CFLAGS_or_unset=${CFLAGS-'(unset)'}
+CPPFLAGS_or_unset=${CPPFLAGS-'(unset)'}
+
+cat >&AC_FD_CC <<EOF
+User:
+ABI=$ABI
+CC=$CC
+CFLAGS=$CFLAGS_or_unset
+CPPFLAGS=$CPPFLAGS_or_unset
+MPN_PATH=$MPN_PATH
+GMP:
+abilist=$abilist
+cclist=$cclist
+EOF
+
+
+test_CFLAGS=${CFLAGS+set}
+test_CPPFLAGS=${CPPFLAGS+set}
+
+for abi in $abilist; do
+  abi_last="$abi"
+done
+
+# If the user specifies an ABI then it must be in $abilist, after that
+# $abilist is restricted to just that choice.
+#
+if test -n "$ABI"; then
+  found=no
+  for abi in $abilist; do
+    if test $abi = "$ABI"; then found=yes; break; fi
+  done
+  if test $found = no; then
+    AC_MSG_ERROR([ABI=$ABI is not among the following valid choices: $abilist])
+  fi
+  abilist="$ABI"
+fi
+
+found_compiler=no
+
+for abi in $abilist; do
+
+  echo "checking ABI=$abi"
+
+  # Suppose abilist="64 32", then for abi=64, will have abi1="_64" and
+  # abi2="_64".  For abi=32, will have abi1="_32" and abi2="".  This is how
+  # $gcc_cflags becomes a fallback for $gcc_32_cflags (the last in the
+  # abilist), but there's no fallback for $gcc_64_cflags.
+  #
+  abi1=[`echo _$abi | sed 's/[.]//g'`]
+  if test $abi = $abi_last; then abi2=; else abi2="$abi1"; fi
+
+  # Compiler choices under this ABI
+                              eval cclist_chosen=\"\$cclist$abi1\"
+  test -n "$cclist_chosen" || eval cclist_chosen=\"\$cclist$abi2\"
+
+  # If there's a user specified $CC then don't use a list for
+  # $cclist_chosen, just a single value for $ccbase.
+  #
+  if test -n "$CC"; then
+
+    # The first word of $CC, stripped of any directory.  For instance
+    # CC="/usr/local/bin/gcc -pipe" will give "gcc".
+    #
+    for ccbase in $CC; do break; done
+    ccbase=`echo $ccbase | sed 's:.*/::'`
+
+    # If this $ccbase is in $cclist_chosen then it's a compiler we know and
+    # we can do flags defaulting with it.  If not, then $cclist_chosen is
+    # set to "unrecognised" so no default flags are used.
+    #
+    # "unrecognised" is used to avoid bad effects with eval if $ccbase has
+    # non-symbol characters.  For instance ccbase=my+cc would end up with
+    # something like cflags="$my+cc_cflags" which would give
+    # cflags="+cc_cflags" rather than the intended empty string for an
+    # unknown compiler.
+    #
+    found=unrecognised
+    for i in $cclist_chosen; do
+      if test "$ccbase" = $i; then
+        found=$ccbase
+        break
+      fi
+    done
+    cclist_chosen=$found
+  fi
+
+  for ccbase in $cclist_chosen; do
+
+    # When cross compiling, look for a compiler with the $host_alias as a
+    # prefix, the same way that AC_CHECK_TOOL does.  But don't do this to a
+    # user-selected $CC.
+    #
+    # $cross_compiling will be yes/no/maybe at this point.  Do the host
+    # prefixing for "maybe" as well as "yes".
+    #
+    if test "$cross_compiling" != no && test -z "$CC"; then
+      cross_compiling_prefix="${host_alias}-"
+    fi
+
+    for ccprefix in $cross_compiling_prefix ""; do
+
+      cc="$CC"
+      test -n "$cc" || cc="$ccprefix$ccbase"
+
+      # If the compiler is gcc but installed under another name, then change
+      # $ccbase so as to use the flags we know for gcc.  This helps for
+      # instance when specifying CC=gcc272 on Debian GNU/Linux, or the
+      # native cc which is really gcc on NeXT or MacOS-X.
+      #
+      # FIXME: There's a slight misfeature here.  If cc is actually gcc but
+      # gcc is not a known compiler under this $abi then we'll end up
+      # testing it with no flags and it'll work, but chances are it won't be
+      # in the right mode for the ABI we desire.  Let's quietly hope this
+      # doesn't happen.
+      #
+      if test $ccbase != gcc; then
+        GMP_PROG_CC_IS_GNU($cc,ccbase=gcc)
+      fi
+
+      # Similarly if the compiler is IBM xlc but invoked as cc or whatever
+      # then change $ccbase and make the default xlc flags available.
+      if test $ccbase != xlc; then
+        GMP_PROG_CC_IS_XLC($cc,ccbase=xlc)
+      fi
+
+      # acc was Sun's first unbundled compiler back in the SunOS days, or
+      # something like that, but today its man page says it's not meant to
+      # be used directly (instead via /usr/ucb/cc).  The options are pretty
+      # much the same as the main SunPRO cc, so share those configs.
+      #
+      case $host in
+        *sparc*-*-solaris* | *sparc*-*-sunos*)
+          if test "$ccbase" = acc; then ccbase=cc; fi ;;
+      esac
+
+      for tmp_cflags_maybe in yes no; do
+                             eval cflags=\"\$${ccbase}${abi1}_cflags\"
+        test -n "$cflags" || eval cflags=\"\$${ccbase}${abi2}_cflags\"
+
+       if test "$tmp_cflags_maybe" = yes; then
+          # don't try cflags_maybe when the user set CFLAGS
+          if test "$test_CFLAGS" = set; then continue; fi
+                                     eval cflags_maybe=\"\$${ccbase}${abi1}_cflags_maybe\"
+          test -n "$cflags_maybe" || eval cflags_maybe=\"\$${ccbase}${abi2}_cflags_maybe\"
+          # don't try cflags_maybe if there's nothing set
+          if test -z "$cflags_maybe"; then continue; fi
+          cflags="$cflags_maybe $cflags"
+        fi
+
+        # Any user CFLAGS, even an empty string, takes precedence
+        if test "$test_CFLAGS" = set; then cflags=$CFLAGS; fi
+
+        # Any user CPPFLAGS, even an empty string, takes precedence
+                               eval cppflags=\"\$${ccbase}${abi1}_cppflags\"
+        test -n "$cppflags" || eval cppflags=\"\$${ccbase}${abi2}_cppflags\"
+        if test "$test_CPPFLAGS" = set; then cppflags=$CPPFLAGS; fi
+
+        # --enable-profiling adds -p/-pg even to user-specified CFLAGS.
+        # This is convenient, but it's perhaps a bit naughty to modify user
+        # CFLAGS.
+        case "$enable_profiling" in
+          prof)       cflags="$cflags -p" ;;
+          gprof)      cflags="$cflags -pg" ;;
+          instrument) cflags="$cflags -finstrument-functions" ;;
+        esac
+
+        GMP_PROG_CC_WORKS($cc $cflags $cppflags,,continue)
+
+        # If we're supposed to be using a "long long" for a limb, check that
+        # it works.
+                                  eval limb_chosen=\"\$limb$abi1\"
+        test -n "$limb_chosen" || eval limb_chosen=\"\$limb$abi2\"
+        if test "$limb_chosen" = longlong; then
+          GMP_PROG_CC_WORKS_LONGLONG($cc $cflags $cppflags,,continue)
+        fi
+
+        # The tests to perform on this $cc, if any
+                               eval testlist=\"\$${ccbase}${abi1}_testlist\"
+        test -n "$testlist" || eval testlist=\"\$${ccbase}${abi2}_testlist\"
+        test -n "$testlist" || eval testlist=\"\$any${abi1}_testlist\"
+        test -n "$testlist" || eval testlist=\"\$any${abi2}_testlist\"
+
+        testlist_pass=yes
+        for tst in $testlist; do
+          case $tst in
+          hpc-hppa-2-0)   GMP_HPC_HPPA_2_0($cc,,testlist_pass=no) ;;
+          gcc-arm-umodsi) GMP_GCC_ARM_UMODSI($cc,,testlist_pass=no) ;;
+          gcc-mips-o32)   GMP_GCC_MIPS_O32($cc,,testlist_pass=no) ;;
+          hppa-level-2.0) GMP_HPPA_LEVEL_20($cc $cflags,,testlist_pass=no) ;;
+          sizeof*)       GMP_C_TEST_SIZEOF($cc $cflags,$tst,,testlist_pass=no) ;;
+          esac
+          if test $testlist_pass = no; then break; fi
+        done
+
+        if test $testlist_pass = yes; then
+          found_compiler=yes
+          break
+        fi
+      done
+
+      if test $found_compiler = yes; then break; fi
+    done
+
+    if test $found_compiler = yes; then break; fi
+  done
+
+  if test $found_compiler = yes; then break; fi
+done
+
+
+# If we recognised the CPU, as indicated by $path being set, then insist
+# that we have a working compiler, either from our $cclist choices or from
+# $CC.  We can't let AC_PROG_CC look around for a compiler because it might
+# find one that we've rejected (for not supporting the modes our asm code
+# demands, etc).
+#
+# If we didn't recognise the CPU (and this includes host_cpu=none), then
+# fall through and let AC_PROG_CC look around for a compiler too.  This is
+# mostly in the interests of following a standard autoconf setup, after all
+# we've already tested cc and gcc adequately (hopefully).  As of autoconf
+# 2.50 the only thing AC_PROG_CC really adds is a check for "cl" (Microsoft
+# C on MS-DOS systems).
+#
+if test $found_compiler = no && test -n "$path"; then
+  AC_MSG_ERROR([could not find a working compiler, see config.log for details])
+fi
+
+case $host in
+  X86_PATTERN | X86_64_PATTERN)
+    # If the user asked for a fat build, override the path and flags set above
+    if test $enable_fat = yes; then
+      gcc_cflags_cpu=""
+      gcc_cflags_arch=""
+
+      fat_functions="add_n addmul_1 bdiv_dbm1c com cnd_add_n cnd_sub_n
+                    copyd copyi dive_1 divrem_1
+                    gcd_1 lshift lshiftc mod_1 mod_1_1 mod_1_1_cps mod_1_2
+                    mod_1_2_cps mod_1_4 mod_1_4_cps mod_34lsub1 mode1o mul_1
+                    mul_basecase mullo_basecase pre_divrem_1 pre_mod_1 redc_1
+                    redc_2 rshift sqr_basecase sub_n submul_1"
+
+      if test "$abi" = 32; then
+       extra_functions="$extra_functions fat fat_entry"
+       path="x86/fat x86"
+       fat_path="x86 x86/fat x86/i486
+                 x86/k6 x86/k6/mmx x86/k6/k62mmx
+                 x86/k7 x86/k7/mmx
+                 x86/k8 x86/k10 x86/bobcat
+                 x86/pentium x86/pentium/mmx
+                 x86/p6 x86/p6/mmx x86/p6/p3mmx x86/p6/sse2
+                 x86/pentium4 x86/pentium4/mmx x86/pentium4/sse2
+                 x86/core2 x86/coreinhm x86/coreisbr
+                 x86/atom x86/atom/mmx x86/atom/sse2 x86/nano"
+      fi
+
+      if test "$abi" = 64; then
+       gcc_64_cflags=""
+       extra_functions_64="$extra_functions_64 fat fat_entry"
+       path_64="x86_64/fat x86_64"
+       fat_path="x86_64 x86_64/fat
+                 x86_64/k8 x86_64/k10 x86_64/bd1 x86_64/bobcat
+                 x86_64/pentium4 x86_64/core2 x86_64/coreinhm x86_64/coreisbr
+                 x86_64/coreihwl x86_64/atom x86_64/nano"
+       fat_functions="$fat_functions addmul_2 addlsh1_n addlsh2_n sublsh1_n"
+      fi
+
+      fat_thresholds="MUL_TOOM22_THRESHOLD MUL_TOOM33_THRESHOLD
+                     SQR_TOOM2_THRESHOLD SQR_TOOM3_THRESHOLD
+                     BMOD_1_TO_MOD_1_THRESHOLD"
+    fi
+    ;;
+esac
+
+
+if test $found_compiler = yes; then
+
+  # If we're creating CFLAGS, then look for optional additions.  If the user
+  # set CFLAGS then leave it alone.
+  #
+  if test "$test_CFLAGS" != set; then
+                          eval optlist=\"\$${ccbase}${abi1}_cflags_optlist\"
+    test -n "$optlist" || eval optlist=\"\$${ccbase}${abi2}_cflags_optlist\"
+
+    for opt in $optlist; do
+                             eval optflags=\"\$${ccbase}${abi1}_cflags_${opt}\"
+      test -n "$optflags" || eval optflags=\"\$${ccbase}${abi2}_cflags_${opt}\"
+      test -n "$optflags" || eval optflags=\"\$${ccbase}_cflags_${opt}\"
+
+      for flag in $optflags; do
+
+       # ~ represents a space in an option spec
+        flag=`echo "$flag" | tr '~' ' '`
+
+        case $flag in
+          -march=pentium4 | -march=k8)
+            # For -march settings which enable SSE2 we exclude certain bad
+            # gcc versions and we need an OS knowing how to save xmm regs.
+            #
+            # This is only for ABI=32, any 64-bit gcc is good and any OS
+            # knowing x86_64 will know xmm.
+            #
+            # -march=k8 was only introduced in gcc 3.3, so we shouldn't need
+            # the GMP_GCC_PENTIUM4_SSE2 check (for gcc 3.2 and prior).  But
+            # it doesn't hurt to run it anyway, sharing code with the
+            # pentium4 case.
+            #
+            if test "$abi" = 32; then
+              GMP_GCC_PENTIUM4_SSE2($cc $cflags $cppflags,, continue)
+              GMP_OS_X86_XMM($cc $cflags $cppflags,, continue)
+            fi
+            ;;
+          -no-cpp-precomp)
+            # special check, avoiding a warning
+            GMP_GCC_NO_CPP_PRECOMP($ccbase,$cc,$cflags,
+                                   [cflags="$cflags $flag"
+                                   break],
+                                   [continue])
+            ;;
+          -Wa,-m*)
+            case $host in
+              alpha*-*-*)
+                GMP_GCC_WA_MCPU($cc $cflags, $flag, , [continue])
+              ;;
+            esac
+            ;;
+          -Wa,-oldas)
+            GMP_GCC_WA_OLDAS($cc $cflags $cppflags,
+                             [cflags="$cflags $flag"
+                             break],
+                             [continue])
+            ;;
+        esac
+
+        GMP_PROG_CC_WORKS($cc $cflags $cppflags $flag,
+          [cflags="$cflags $flag"
+          break])
+      done
+    done
+  fi
+
+  ABI="$abi"
+  CC="$cc"
+  CFLAGS="$cflags"
+  CPPFLAGS="$cppflags"
+  eval GMP_NONSTD_ABI=\"\$GMP_NONSTD_ABI_$ABI\"
+
+  # Could easily have this in config.h too, if desired.
+  ABI_nodots=`echo $ABI | sed 's/\./_/'`
+  GMP_DEFINE_RAW("define_not_for_expansion(\`HAVE_ABI_$ABI_nodots')", POST)
+
+
+  # GMP_LDFLAGS substitution, selected according to ABI.
+  # These are needed on libgmp.la and libmp.la, but currently not on
+  # convenience libraries like tune/libspeed.la or mpz/libmpz.la.
+  #
+                            eval GMP_LDFLAGS=\"\$${ccbase}${abi1}_ldflags\"
+  test -n "$GMP_LDFLAGS" || eval GMP_LDFLAGS=\"\$${ccbase}${abi1}_ldflags\"
+  AC_SUBST(GMP_LDFLAGS)
+  AC_SUBST(LIBGMP_LDFLAGS)
+  AC_SUBST(LIBGMPXX_LDFLAGS)
+
+  # extra_functions, selected according to ABI
+                    eval tmp=\"\$extra_functions$abi1\"
+  test -n "$tmp" || eval tmp=\"\$extra_functions$abi2\"
+  extra_functions="$tmp"
+
+
+  # Cycle counter, selected according to ABI.
+  #
+                    eval tmp=\"\$SPEED_CYCLECOUNTER_OBJ$abi1\"
+  test -n "$tmp" || eval tmp=\"\$SPEED_CYCLECOUNTER_OBJ$abi2\"
+  SPEED_CYCLECOUNTER_OBJ="$tmp"
+                    eval tmp=\"\$cyclecounter_size$abi1\"
+  test -n "$tmp" || eval tmp=\"\$cyclecounter_size$abi2\"
+  cyclecounter_size="$tmp"
+
+  if test -n "$SPEED_CYCLECOUNTER_OBJ"; then
+    AC_DEFINE_UNQUOTED(HAVE_SPEED_CYCLECOUNTER, $cyclecounter_size,
+    [Tune directory speed_cyclecounter, undef=none, 1=32bits, 2=64bits)])
+  fi
+  AC_SUBST(SPEED_CYCLECOUNTER_OBJ)
+
+
+  # Calling conventions checking, selected according to ABI.
+  #
+                    eval tmp=\"\$CALLING_CONVENTIONS_OBJS$abi1\"
+  test -n "$tmp" || eval tmp=\"\$CALLING_CONVENTIONS_OBJS$abi2\"
+  if test "$enable_assembly" = "yes"; then
+     CALLING_CONVENTIONS_OBJS="$tmp"
+  else
+     CALLING_CONVENTIONS_OBJS=""
+  fi
+
+  if test -n "$CALLING_CONVENTIONS_OBJS"; then
+    AC_DEFINE(HAVE_CALLING_CONVENTIONS,1,
+    [Define to 1 if tests/libtests has calling conventions checking for the CPU])
+  fi
+  AC_SUBST(CALLING_CONVENTIONS_OBJS)
+
+fi
+
+
+# If the user gave an MPN_PATH, use that verbatim, otherwise choose
+# according to the ABI and add "generic".
+#
+if test -n "$MPN_PATH"; then
+  path="$MPN_PATH"
+else
+                    eval tmp=\"\$path$abi1\"
+  test -n "$tmp" || eval tmp=\"\$path$abi2\"
+  path="$tmp generic"
+fi
+
+
+# Long long limb setup for gmp.h.
+case $limb_chosen in
+longlong) DEFN_LONG_LONG_LIMB="#define _LONG_LONG_LIMB 1"    ;;
+*)        DEFN_LONG_LONG_LIMB="/* #undef _LONG_LONG_LIMB */" ;;
+esac
+AC_SUBST(DEFN_LONG_LONG_LIMB)
+
+
+# The C compiler and preprocessor, put into ANSI mode if possible.
+AC_PROG_CC
+AC_PROG_CC_STDC
+AC_PROG_CPP
+
+
+# The C compiler on the build system, and associated tests.
+GMP_PROG_CC_FOR_BUILD
+GMP_PROG_CPP_FOR_BUILD
+GMP_PROG_EXEEXT_FOR_BUILD
+GMP_C_FOR_BUILD_ANSI
+GMP_CHECK_LIBM_FOR_BUILD
+
+
+# How to assemble, used with CFLAGS etc, see mpn/Makeasm.am.
+# Using the compiler is a lot easier than figuring out how to invoke the
+# assembler directly.
+#
+test -n "$CCAS" || CCAS="$CC -c"
+AC_SUBST(CCAS)
+
+
+# The C++ compiler, if desired.
+want_cxx=no
+if test $enable_cxx != no; then
+  test_CXXFLAGS=${CXXFLAGS+set}
+  AC_PROG_CXX
+
+  echo "CXXFLAGS chosen by autoconf: $CXXFLAGS" >&AC_FD_CC
+  cxxflags_ac_prog_cxx=$CXXFLAGS
+  cxxflags_list=ac_prog_cxx
+
+  # If the user didn't specify $CXXFLAGS, then try $CFLAGS, with -g removed
+  # if AC_PROG_CXX thinks that doesn't work.  $CFLAGS stands a good chance
+  # of working, eg. on a GNU system where CC=gcc and CXX=g++.
+  #
+  if test "$test_CXXFLAGS" != set; then
+    cxxflags_cflags=$CFLAGS
+    cxxflags_list="cflags $cxxflags_list"
+    if test "$ac_prog_cxx_g" = no; then
+      cxxflags_cflags=`echo "$cxxflags_cflags" | sed -e 's/ -g //' -e 's/^-g //' -e 's/ -g$//'`
+    fi
+  fi
+
+  # See if the C++ compiler works.  If the user specified CXXFLAGS then all
+  # we're doing is checking whether AC_PROG_CXX succeeded, since it doesn't
+  # give a fatal error, just leaves CXX set to a default g++.  If on the
+  # other hand the user didn't specify CXXFLAGS then we get to try here our
+  # $cxxflags_list alternatives.
+  #
+  # Automake includes $CPPFLAGS in a C++ compile, so we do the same here.
+  #
+  for cxxflags_choice in $cxxflags_list; do
+    eval CXXFLAGS=\"\$cxxflags_$cxxflags_choice\"
+    GMP_PROG_CXX_WORKS($CXX $CPPFLAGS $CXXFLAGS,
+      [want_cxx=yes
+      break])
+  done
+
+  # If --enable-cxx=yes but a C++ compiler can't be found, then abort.
+  if test $want_cxx = no && test $enable_cxx = yes; then
+    AC_MSG_ERROR([C++ compiler not available, see config.log for details])
+  fi
+fi
+
+AM_CONDITIONAL(WANT_CXX, test $want_cxx = yes)
+
+# FIXME: We're not interested in CXXCPP for ourselves, but if we don't do it
+# here then AC_PROG_LIBTOOL will AC_REQUIRE it (via _LT_AC_TAGCONFIG) and
+# hence execute it unconditionally, and that will fail if there's no C++
+# compiler (and no generic /lib/cpp).
+#
+if test $want_cxx = yes; then
+  AC_PROG_CXXCPP
+fi
+
+
+# Path setups for Cray, according to IEEE or CFP.  These must come after
+# deciding the compiler.
+#
+GMP_CRAY_OPTIONS(
+  [add_path="cray/ieee"],
+  [add_path="cray/cfp"; extra_functions="mulwwc90"],
+  [add_path="cray/cfp"; extra_functions="mulwwj90"])
+
+
+if test -z "$MPN_PATH"; then
+  path="$add_path $path"
+fi
+
+# For a nail build, also look in "nails" subdirectories.
+#
+if test $GMP_NAIL_BITS != 0 && test -z "$MPN_PATH"; then
+  new_path=
+  for i in $path; do
+    case $i in
+    generic) new_path="$new_path $i" ;;
+    *)       new_path="$new_path $i/nails $i" ;;
+    esac
+  done
+  path=$new_path
+fi
+
+
+# Put all directories into CPUVEC_list so as to get a full set of
+# CPUVEC_SETUP_$tmp_suffix defines into config.h, even if some of them are
+# empty because mmx and/or sse2 had to be dropped.
+#
+for i in $fat_path; do
+  GMP_FAT_SUFFIX(tmp_suffix, $i)
+  CPUVEC_list="$CPUVEC_list CPUVEC_SETUP_$tmp_suffix"
+done
+
+
+# If there's any sse2 or mmx in the path, check whether the assembler
+# supports it, and remove if not.
+#
+# We only need this in ABI=32, for ABI=64 on x86_64 we can assume a new
+# enough assembler.
+#
+case $host in
+  X86_PATTERN | X86_64_PATTERN)
+    if test "$ABI" = 32; then
+      case "$path $fat_path" in
+        *mmx*)   GMP_ASM_X86_MMX( , [GMP_STRIP_PATH(*mmx*)]) ;;
+      esac
+      case "$path $fat_path" in
+        *sse2*)  GMP_ASM_X86_SSE2( , [GMP_STRIP_PATH(sse2)]) ;;
+      esac
+    fi
+    case "$path $fat_path" in
+      *mulx*)  GMP_ASM_X86_MULX( , [GMP_STRIP_PATH(mulx)]) ;;
+    esac
+    case "$path $fat_path" in
+      *adx*)   GMP_ASM_X86_ADX( , [GMP_STRIP_PATH(adx)]) ;;
+    esac
+    ;;
+esac
+
+
+if test "$enable_assembly" = "no"; then
+  path="generic"
+  CFLAGS="$CFLAGS -DNO_ASM"
+#  for abi in $abilist; do
+#    eval unset "path_\$abi"
+#    eval gcc_${abi}_cflags=\"\$gcc_${abi}_cflags -DNO_ASM\"
+#  done
+fi
+
+
+cat >&AC_FD_CC <<EOF
+Decided:
+ABI=$ABI
+CC=$CC
+CFLAGS=$CFLAGS
+CPPFLAGS=$CPPFLAGS
+GMP_LDFLAGS=$GMP_LDFLAGS
+CXX=$CXX
+CXXFLAGS=$CXXFLAGS
+path=$path
+EOF
+echo "using ABI=\"$ABI\""
+echo "      CC=\"$CC\""
+echo "      CFLAGS=\"$CFLAGS\""
+echo "      CPPFLAGS=\"$CPPFLAGS\""
+if test $want_cxx = yes; then
+  echo "      CXX=\"$CXX\""
+  echo "      CXXFLAGS=\"$CXXFLAGS\""
+fi
+echo "      MPN_PATH=\"$path\""
+
+
+CL_AS_NOEXECSTACK
+
+GMP_PROG_AR
+GMP_PROG_NM
+
+case $host in
+  # FIXME: On AIX 3 and 4, $libname.a is included in libtool
+  # $library_names_spec, so libgmp.a becomes a symlink to libgmp.so, making
+  # it impossible to build shared and static libraries simultaneously.
+  # Disable shared libraries by default, but let the user override with
+  # --enable-shared --disable-static.
+  #
+  # FIXME: This $libname.a problem looks like it might apply to *-*-amigaos*
+  # and *-*-os2* too, but wait for someone to test this before worrying
+  # about it.  If there is a problem then of course libtool is the right
+  # place to fix it.
+  #
+  [*-*-aix[34]*])
+    if test -z "$enable_shared"; then enable_shared=no; fi ;;
+esac
+
+
+# Configs for Windows DLLs.
+
+AC_LIBTOOL_WIN32_DLL
+
+AC_SUBST(LIBGMP_DLL,0)
+case $host in
+  *-*-cygwin* | *-*-mingw* | *-*-pw32* | *-*-os2*)
+    # By default, build only static.
+    if test -z "$enable_shared"; then
+      enable_shared=no
+    fi
+    # Don't allow both static and DLL.
+    if test "$enable_shared" != no && test "$enable_static" != no; then
+      AC_MSG_ERROR([cannot build both static and DLL, since gmp.h is different for each.
+Use "--disable-static --enable-shared" to build just a DLL.])
+    fi
+
+    # "-no-undefined" is required when building a DLL, see documentation on
+    # AC_LIBTOOL_WIN32_DLL.
+    #
+    # "-Wl,--export-all-symbols" is a bit of a hack, it gets all libgmp and
+    # libgmpxx functions and variables exported.  This is what libtool did
+    # in the past, and it's convenient for us in the test programs.
+    #
+    # Maybe it'd be prudent to check for --export-all-symbols before using
+    # it, but it seems to have been in ld since at least 2000, and there's
+    # not really any alternative we want to take up at the moment.
+    #
+    # "-Wl,output-def" is used to get a .def file for use by MS lib to make
+    # a .lib import library, described in the manual.  libgmp-3.dll.def
+    # corresponds to the libmp-3.dll.def generated by libtool (as a result
+    # of -export-symbols on that library).
+    #
+    # Incidentally, libtool does generate an import library libgmp.dll.a,
+    # but it's "ar" format and cannot be used by the MS linker.  There
+    # doesn't seem to be any GNU tool for generating or converting to .lib.
+    #
+    # FIXME: The .def files produced by -Wl,output-def include isascii,
+    # iscsym, iscsymf and toascii, apparently because mingw ctype.h doesn't
+    # inline isascii (used in gmp).  It gives an extern inline for
+    # __isascii, but for some reason not the plain isascii.
+    #
+    if test "$enable_shared" = yes; then
+      GMP_LDFLAGS="$GMP_LDFLAGS -no-undefined -Wl,--export-all-symbols"
+      LIBGMP_LDFLAGS="$LIBGMP_LDFLAGS -Wl,--output-def,.libs/libgmp-3.dll.def"
+      LIBGMPXX_LDFLAGS="$LIBGMP_LDFLAGS -Wl,--output-def,.libs/libgmpxx-3.dll.def"
+      LIBGMP_DLL=1
+    fi
+    ;;
+esac
+
+
+# Ensure that $CONFIG_SHELL is available for AC_LIBTOOL_SYS_MAX_CMD_LEN.
+# It's often set already by _LT_AC_PROG_ECHO_BACKSLASH or
+# _AS_LINENO_PREPARE, but not always.
+#
+# The symptom of CONFIG_SHELL unset is some "expr" errors during the test,
+# and an empty result.  This only happens when invoked as "sh configure",
+# ie. no path, and can be seen for instance on ia64-*-hpux*.
+#
+# FIXME: Newer libtool should have it's own fix for this.
+#
+if test -z "$CONFIG_SHELL"; then
+  CONFIG_SHELL=$SHELL
+fi
+
+# Enable CXX in libtool only if we want it, and never enable GCJ, nor RC on
+# mingw and cygwin.  Under --disable-cxx this avoids some error messages
+# from libtool arising from the fact we didn't actually run AC_PROG_CXX.
+# Notice that any user-supplied --with-tags setting takes precedence.
+#
+# FIXME: Is this the right way to get this effect?  Very possibly not, but
+# the current _LT_AC_TAGCONFIG doesn't really suggest an alternative.
+#
+if test "${with_tags+set}" != set; then
+  if test $want_cxx = yes; then
+    with_tags=CXX
+  else
+    with_tags=
+  fi
+fi
+
+# The dead hand of AC_REQUIRE makes AC_PROG_LIBTOOL expand and execute
+# AC_PROG_F77, even when F77 is not in the selected with_tags.  This is
+# probably harmless, but it's unsightly and bloats our configure, so pretend
+# AC_PROG_F77 has been expanded already.
+#
+# FIXME: Rumour has it libtool will one day provide a way for a configure.in
+# to say what it wants from among supported languages etc.
+#
+#AC_PROVIDE([AC_PROG_F77])
+
+AC_PROG_LIBTOOL
+
+# Generate an error here if attempting to build both shared and static when
+# $libname.a is in $library_names_spec (as mentioned above), rather than
+# wait for ar or ld to fail.
+#
+if test "$enable_shared" = yes && test "$enable_static" = yes; then
+  case $library_names_spec in
+    *libname.a*)
+      AC_MSG_ERROR([cannot create both shared and static libraries on this system, --disable one of the two])
+      ;;
+  esac
+fi
+
+AM_CONDITIONAL(ENABLE_STATIC, test "$enable_static" = yes)
+
+
+# Many of these library and header checks are for the benefit of
+# supplementary programs.  libgmp doesn't use anything too weird.
+
+AC_HEADER_STDC
+AC_HEADER_TIME
+
+# Reasons for testing:
+#   float.h - not in SunOS bundled cc
+#   invent.h - IRIX specific
+#   langinfo.h - X/Open standard only, not in djgpp for instance
+#   locale.h - old systems won't have this
+#   nl_types.h - X/Open standard only, not in djgpp for instance
+#       (usually langinfo.h gives nl_item etc, but not on netbsd 1.4.1)
+#   sys/attributes.h - IRIX specific
+#   sys/iograph.h - IRIX specific
+#   sys/mman.h - not in Cray Unicos
+#   sys/param.h - not in mingw
+#   sys/processor.h - solaris specific, though also present in macos
+#   sys/pstat.h - HPUX specific
+#   sys/resource.h - not in mingw
+#   sys/sysctl.h - not in mingw
+#   sys/sysinfo.h - OSF specific
+#   sys/syssgi.h - IRIX specific
+#   sys/systemcfg.h - AIX specific
+#   sys/time.h - autoconf suggests testing, don't know anywhere without it
+#   sys/times.h - not in mingw
+#   machine/hal_sysinfo.h - OSF specific
+#
+# inttypes.h, stdint.h, unistd.h and sys/types.h are already in the autoconf
+# default tests
+#
+AC_CHECK_HEADERS(fcntl.h float.h invent.h langinfo.h locale.h nl_types.h sys/attributes.h sys/iograph.h sys/mman.h sys/param.h sys/processor.h sys/pstat.h sys/sysinfo.h sys/syssgi.h sys/systemcfg.h sys/time.h sys/times.h)
+
+# On SunOS, sys/resource.h needs sys/time.h (for struct timeval)
+AC_CHECK_HEADERS(sys/resource.h,,,
+[#if TIME_WITH_SYS_TIME
+# include <sys/time.h>
+# include <time.h>
+#else
+# if HAVE_SYS_TIME_H
+#  include <sys/time.h>
+# else
+#  include <time.h>
+# endif
+#endif])
+
+# On NetBSD and OpenBSD, sys/sysctl.h needs sys/param.h for various constants
+AC_CHECK_HEADERS(sys/sysctl.h,,,
+[#if HAVE_SYS_PARAM_H
+# include <sys/param.h>
+#endif])
+
+# On OSF 4.0, <machine/hal_sysinfo.h> must have <sys/sysinfo.h> for ulong_t
+AC_CHECK_HEADERS(machine/hal_sysinfo.h,,,
+[#if HAVE_SYS_SYSINFO_H
+# include <sys/sysinfo.h>
+#endif])
+
+# Reasons for testing:
+#   optarg - not declared in mingw
+#   fgetc, fscanf, ungetc, vfprintf - not declared in SunOS 4
+#   sys_errlist, sys_nerr - not declared in SunOS 4
+#
+# optarg should be in unistd.h and the rest in stdio.h, both of which are
+# in the autoconf default includes.
+#
+# sys_errlist and sys_nerr are supposed to be in <errno.h> on SunOS according
+# to the man page (but aren't), in glibc they're in stdio.h.
+#
+AC_CHECK_DECLS([fgetc, fscanf, optarg, ungetc, vfprintf])
+AC_CHECK_DECLS([sys_errlist, sys_nerr], , ,
+[#include <stdio.h>
+#include <errno.h>])
+
+AC_TYPE_SIGNAL
+
+# Reasons for testing:
+#   intmax_t       - C99
+#   long double    - not in the HP bundled K&R cc
+#   long long      - only in reasonably recent compilers
+#   ptrdiff_t      - seems to be everywhere, maybe don't need to check this
+#   quad_t         - BSD specific
+#   uint_least32_t - C99
+#
+# the default includes are sufficient for all these types
+#
+AC_CHECK_TYPES([intmax_t, long double, long long, ptrdiff_t, quad_t,
+               uint_least32_t, intptr_t])
+
+AC_C_STRINGIZE
+
+# FIXME: Really want #ifndef __cplusplus around the #define volatile
+# replacement autoconf gives, since volatile is always available in C++.
+# But we don't use it in C++ currently.
+AC_C_VOLATILE
+
+AC_C_RESTRICT
+
+# GMP_C_STDARG
+GMP_C_ATTRIBUTE_CONST
+GMP_C_ATTRIBUTE_MALLOC
+GMP_C_ATTRIBUTE_MODE
+GMP_C_ATTRIBUTE_NORETURN
+
+GMP_H_EXTERN_INLINE
+
+# from libtool
+AC_CHECK_LIBM
+AC_SUBST(LIBM)
+
+GMP_FUNC_ALLOCA
+GMP_OPTION_ALLOCA
+
+GMP_H_HAVE_FILE
+
+AC_C_BIGENDIAN(
+  [AC_DEFINE(HAVE_LIMB_BIG_ENDIAN, 1)
+   GMP_DEFINE_RAW("define_not_for_expansion(\`HAVE_LIMB_BIG_ENDIAN')", POST)],
+  [AC_DEFINE(HAVE_LIMB_LITTLE_ENDIAN, 1)
+   GMP_DEFINE_RAW("define_not_for_expansion(\`HAVE_LIMB_LITTLE_ENDIAN')", POST)
+  ], [:])
+AH_VERBATIM([HAVE_LIMB],
+[/* Define one of these to 1 for the endianness of `mp_limb_t'.
+   If the endianness is not a simple big or little, or you don't know what
+   it is, then leave both undefined. */
+#undef HAVE_LIMB_BIG_ENDIAN
+#undef HAVE_LIMB_LITTLE_ENDIAN])
+
+GMP_C_DOUBLE_FORMAT
+
+
+# Reasons for testing:
+#   alarm - not in mingw
+#   attr_get - IRIX specific
+#   clock_gettime - not in glibc 2.2.4, only very recent systems
+#   cputime - not in glibc
+#   getsysinfo - OSF specific
+#   getrusage - not in mingw
+#   gettimeofday - not in mingw
+#   mmap - not in mingw, djgpp
+#   nl_langinfo - X/Open standard only, not in djgpp for instance
+#   obstack_vprintf - glibc specific
+#   processor_info - solaris specific
+#   pstat_getprocessor - HPUX specific (10.x and up)
+#   raise - an ANSI-ism, though probably almost universal by now
+#   read_real_time - AIX specific
+#   sigaction - not in mingw
+#   sigaltstack - not in mingw, or old AIX (reputedly)
+#   sigstack - not in mingw
+#   strerror - not in SunOS
+#   strnlen - glibc extension (some other systems too)
+#   syssgi - IRIX specific
+#   times - not in mingw
+#
+# AC_FUNC_STRNLEN is not used because we don't want the AC_LIBOBJ
+# replacement setups it gives.  It detects a faulty strnlen on AIX, but
+# missing out on that test is ok since our only use of strnlen is in
+# __gmp_replacement_vsnprintf which is not required on AIX since it has a
+# vsnprintf.
+#
+AC_CHECK_FUNCS(alarm attr_get clock cputime getpagesize getrusage gettimeofday getsysinfo localeconv memset mmap mprotect nl_langinfo obstack_vprintf popen processor_info pstat_getprocessor raise read_real_time sigaction sigaltstack sigstack syssgi strchr strerror strnlen strtol strtoul sysconf sysctl sysctlbyname times)
+
+# clock_gettime is in librt on *-*-osf5.1 and on glibc, so att -lrt to
+# TUNE_LIBS if needed. On linux (tested on x86_32, 2.6.26),
+# clock_getres reports ns accuracy, while in a quick test on osf
+# clock_getres said only 1 millisecond.
+
+old_LIBS="$LIBS"
+AC_SEARCH_LIBS(clock_gettime, rt, [
+  AC_DEFINE([HAVE_CLOCK_GETTIME],1,[Define to 1 if you have the `clock_gettime' function])])
+TUNE_LIBS="$LIBS"
+LIBS="$old_LIBS"
+
+AC_SUBST(TUNE_LIBS)
+
+GMP_FUNC_VSNPRINTF
+GMP_FUNC_SSCANF_WRITABLE_INPUT
+
+# Reasons for checking:
+#   pst_processor psp_iticksperclktick - not in hpux 9
+#
+AC_CHECK_MEMBER(struct pst_processor.psp_iticksperclktick,
+                [AC_DEFINE(HAVE_PSP_ITICKSPERCLKTICK, 1,
+[Define to 1 if <sys/pstat.h> `struct pst_processor' exists
+and contains `psp_iticksperclktick'.])],,
+                [#include <sys/pstat.h>])
+
+# C++ tests, when required
+#
+if test $enable_cxx = yes; then
+  AC_LANG_PUSH(C++)
+
+  # Reasons for testing:
+  #   <sstream> - not in g++ 2.95.2
+  #   std::locale - not in g++ 2.95.4
+  #
+  AC_CHECK_HEADERS([sstream])
+  AC_CHECK_TYPES([std::locale],,,[#include <locale>])
+
+  AC_LANG_POP(C++)
+fi
+
+
+# Pick the correct source files in $path and link them to mpn/.
+# $gmp_mpn_functions lists all functions we need.
+#
+# The rule is to find a file with the function name and a .asm, .S,
+# .s, or .c extension.  Certain multi-function files with special names
+# can provide some functions too.  (mpn/Makefile.am passes
+# -DOPERATION_<func> to get them to generate the right code.)
+
+# Note: $gmp_mpn_functions must have mod_1 before pre_mod_1 so the former
+#       can optionally provide the latter as an extra entrypoint.  Likewise
+#       divrem_1 and pre_divrem_1.
+
+gmp_mpn_functions_optional="umul udiv                                  \
+  invert_limb sqr_diagonal sqr_diag_addlsh1                            \
+  mul_2 mul_3 mul_4 mul_5 mul_6                                                \
+  addmul_2 addmul_3 addmul_4 addmul_5 addmul_6 addmul_7 addmul_8       \
+  addlsh1_n sublsh1_n rsblsh1_n rsh1add_n rsh1sub_n                    \
+  addlsh2_n sublsh2_n rsblsh2_n                                                \
+  addlsh_n sublsh_n rsblsh_n                                           \
+  add_n_sub_n addaddmul_1msb0"
+
+gmp_mpn_functions="$extra_functions                                       \
+  add add_1 add_n sub sub_1 sub_n cnd_add_n cnd_sub_n neg com             \
+  mul_1 addmul_1 submul_1                                                 \
+  add_err1_n add_err2_n add_err3_n sub_err1_n sub_err2_n sub_err3_n       \
+  lshift rshift dive_1 diveby3 divis divrem divrem_1 divrem_2             \
+  fib2_ui mod_1 mod_34lsub1 mode1o pre_divrem_1 pre_mod_1 dump            \
+  mod_1_1 mod_1_2 mod_1_3 mod_1_4 lshiftc                                 \
+  mul mul_fft mul_n sqr mul_basecase sqr_basecase nussbaumer_mul          \
+  mulmid_basecase toom42_mulmid mulmid_n mulmid                                   \
+  random random2 pow_1                                                    \
+  rootrem sqrtrem sizeinbase get_str set_str                              \
+  scan0 scan1 popcount hamdist cmp                                        \
+  perfsqr perfpow                                                         \
+  gcd_1 gcd gcdext_1 gcdext gcd_subdiv_step                               \
+  gcdext_lehmer                                                                   \
+  div_q tdiv_qr jacbase jacobi_2 jacobi get_d                             \
+  matrix22_mul matrix22_mul1_inverse_vector                               \
+  hgcd_matrix hgcd2 hgcd_step hgcd_reduce hgcd hgcd_appr                  \
+  hgcd2_jacobi hgcd_jacobi                                                \
+  mullo_n mullo_basecase                                                  \
+  toom22_mul toom32_mul toom42_mul toom52_mul toom62_mul                  \
+  toom33_mul toom43_mul toom53_mul toom54_mul toom63_mul                  \
+  toom44_mul                                                              \
+  toom6h_mul toom6_sqr toom8h_mul toom8_sqr                               \
+  toom_couple_handling                                                    \
+  toom2_sqr toom3_sqr toom4_sqr                                                   \
+  toom_eval_dgr3_pm1 toom_eval_dgr3_pm2                                           \
+  toom_eval_pm1 toom_eval_pm2 toom_eval_pm2exp toom_eval_pm2rexp          \
+  toom_interpolate_5pts toom_interpolate_6pts toom_interpolate_7pts       \
+  toom_interpolate_8pts toom_interpolate_12pts toom_interpolate_16pts     \
+  invertappr invert binvert mulmod_bnm1 sqrmod_bnm1                       \
+  div_qr_1 div_qr_1n_pi1                                                  \
+  div_qr_2 div_qr_2n_pi1 div_qr_2u_pi1                                    \
+  sbpi1_div_q sbpi1_div_qr sbpi1_divappr_q                                \
+  dcpi1_div_q dcpi1_div_qr dcpi1_divappr_q                                \
+  mu_div_qr mu_divappr_q mu_div_q                                         \
+  bdiv_q_1                                                                \
+  sbpi1_bdiv_q sbpi1_bdiv_qr                                              \
+  dcpi1_bdiv_q dcpi1_bdiv_qr                                              \
+  mu_bdiv_q mu_bdiv_qr                                                    \
+  bdiv_q bdiv_qr broot brootinv bsqrt bsqrtinv                            \
+  divexact bdiv_dbm1c redc_1 redc_2 redc_n powm powlo sec_powm            \
+  sec_mul sec_sqr sec_div_qr sec_div_r sec_pi1_div_qr sec_pi1_div_r       \
+  sec_add_1 sec_sub_1 sec_invert                                          \
+  trialdiv remove                                                         \
+  and_n andn_n nand_n ior_n iorn_n nior_n xor_n xnor_n                    \
+  copyi copyd zero sec_tabselect                                          \
+  comb_tables                                                             \
+  $gmp_mpn_functions_optional"
+
+define(GMP_MULFUNC_CHOICES,
+[# functions that can be provided by multi-function files
+tmp_mulfunc=
+case $tmp_fn in
+  add_n|sub_n)       tmp_mulfunc="aors_n"    ;;
+  add_err1_n|sub_err1_n)
+                    tmp_mulfunc="aors_err1_n" ;;
+  add_err2_n|sub_err2_n)
+                    tmp_mulfunc="aors_err2_n" ;;
+  add_err3_n|sub_err3_n)
+                    tmp_mulfunc="aors_err3_n" ;;
+  cnd_add_n|cnd_sub_n) tmp_mulfunc="cnd_aors_n"   ;;
+  sec_add_1|sec_sub_1) tmp_mulfunc="sec_aors_1"   ;;
+  addmul_1|submul_1) tmp_mulfunc="aorsmul_1" ;;
+  mul_2|addmul_2)    tmp_mulfunc="aormul_2" ;;
+  mul_3|addmul_3)    tmp_mulfunc="aormul_3" ;;
+  mul_4|addmul_4)    tmp_mulfunc="aormul_4" ;;
+  popcount|hamdist)  tmp_mulfunc="popham"    ;;
+  and_n|andn_n|nand_n | ior_n|iorn_n|nior_n | xor_n|xnor_n)
+                     tmp_mulfunc="logops_n"  ;;
+  lshift|rshift)     tmp_mulfunc="lorrshift";;
+  addlsh1_n)
+                    tmp_mulfunc="aorslsh1_n aorrlsh1_n aorsorrlsh1_n";;
+  sublsh1_n)
+                    tmp_mulfunc="aorslsh1_n sorrlsh1_n aorsorrlsh1_n";;
+  rsblsh1_n)
+                    tmp_mulfunc="aorrlsh1_n sorrlsh1_n aorsorrlsh1_n";;
+  addlsh2_n)
+                    tmp_mulfunc="aorslsh2_n aorrlsh2_n aorsorrlsh2_n";;
+  sublsh2_n)
+                    tmp_mulfunc="aorslsh2_n sorrlsh2_n aorsorrlsh2_n";;
+  rsblsh2_n)
+                    tmp_mulfunc="aorrlsh2_n sorrlsh2_n aorsorrlsh2_n";;
+  addlsh_n)
+                    tmp_mulfunc="aorslsh_n aorrlsh_n aorsorrlsh_n";;
+  sublsh_n)
+                    tmp_mulfunc="aorslsh_n sorrlsh_n aorsorrlsh_n";;
+  rsblsh_n)
+                    tmp_mulfunc="aorrlsh_n sorrlsh_n aorsorrlsh_n";;
+  rsh1add_n|rsh1sub_n)
+                    tmp_mulfunc="rsh1aors_n";;
+  sec_div_qr|sec_div_r)
+                    tmp_mulfunc="sec_div";;
+  sec_pi1_div_qr|sec_pi1_div_r)
+                    tmp_mulfunc="sec_pi1_div";;
+esac
+])
+
+# the list of all object files used by mpn/Makefile.in and the
+# top-level Makefile.in, respectively
+mpn_objects=
+mpn_objs_in_libgmp=
+
+# links from the sources, to be removed by "make distclean"
+gmp_srclinks=
+
+
+# mpn_relative_top_srcdir is $top_srcdir, but for use from within the mpn
+# build directory.  If $srcdir is relative then we use a relative path too,
+# so the two trees can be moved together.
+case $srcdir in
+  [[\\/]* | ?:[\\/]*])  # absolute, as per autoconf
+    mpn_relative_top_srcdir=$srcdir ;;
+  *)                    # relative
+    mpn_relative_top_srcdir=../$srcdir ;;
+esac
+
+
+define(MPN_SUFFIXES,[asm S s c])
+
+dnl  Usage: GMP_FILE_TO_FUNCTION_BASE(func,file)
+dnl
+dnl  Set $func to the function base name for $file, eg. dive_1 gives
+dnl  divexact_1.
+dnl
+define(GMP_FILE_TO_FUNCTION,
+[case $$2 in
+  dive_1)      $1=divexact_1 ;;
+  diveby3)     $1=divexact_by3c ;;
+  pre_divrem_1) $1=preinv_divrem_1 ;;
+  mode1o)      $1=modexact_1c_odd ;;
+  pre_mod_1)   $1=preinv_mod_1 ;;
+  mod_1_1)     $1=mod_1_1p ;;
+  mod_1_1_cps) $1=mod_1_1p_cps ;;
+  mod_1_2)     $1=mod_1s_2p ;;
+  mod_1_2_cps) $1=mod_1s_2p_cps ;;
+  mod_1_3)     $1=mod_1s_3p ;;
+  mod_1_3_cps) $1=mod_1s_3p_cps ;;
+  mod_1_4)     $1=mod_1s_4p ;;
+  mod_1_4_cps) $1=mod_1s_4p_cps ;;
+  *)           $1=$$2 ;;
+esac
+])
+
+# Fat binary setups.
+#
+# We proceed through each $fat_path directory, and look for $fat_function
+# routines there.  Those found are incorporated in the build by generating a
+# little mpn/<foo>.asm or mpn/<foo>.c file in the build directory, with
+# suitable function renaming, and adding that to $mpn_objects (the same as a
+# normal mpn file).
+#
+# fat.h is generated with macros to let internal calls to each $fat_function
+# go directly through __gmpn_cpuvec, plus macros and declarations helping to
+# setup that structure, on a per-directory basis ready for
+# mpn/<cpu>/fat/fat.c.
+#
+# fat.h includes thresholds listed in $fat_thresholds, extracted from
+# gmp-mparam.h in each directory.  An overall maximum for each threshold is
+# established, for use in making fixed size arrays of temporary space.
+# (Eg. MUL_TOOM33_THRESHOLD_LIMIT used by mpn/generic/mul.c.)
+#
+# It'd be possible to do some of this manually, but when there's more than a
+# few functions and a few directories it becomes very tedious, and very
+# prone to having some routine accidentally omitted.  On that basis it seems
+# best to automate as much as possible, even if the code to do so is a bit
+# ugly.
+#
+
+if test -n "$fat_path"; then
+  # Usually the mpn build directory is created with mpn/Makefile
+  # instantiation, but we want to write to it sooner.
+  mkdir mpn 2>/dev/null
+
+  echo "/* fat.h - setups for fat binaries." >fat.h
+  echo "   Generated by configure - DO NOT EDIT.  */" >>fat.h
+
+  AC_DEFINE(WANT_FAT_BINARY, 1, [Define to 1 when building a fat binary.])
+  GMP_DEFINE(WANT_FAT_BINARY, yes)
+
+  # Don't want normal copies of fat functions
+  for tmp_fn in $fat_functions; do
+    GMP_REMOVE_FROM_LIST(gmp_mpn_functions, $tmp_fn)
+    GMP_REMOVE_FROM_LIST(gmp_mpn_functions_optional, $tmp_fn)
+  done
+
+  for tmp_fn in $fat_functions; do
+    GMP_FILE_TO_FUNCTION(tmp_fbase,tmp_fn)
+    echo "
+#ifndef OPERATION_$tmp_fn
+#undef  mpn_$tmp_fbase
+#define mpn_$tmp_fbase  (*__gmpn_cpuvec.$tmp_fbase)
+#endif
+DECL_$tmp_fbase (__MPN(${tmp_fbase}_init));" >>fat.h
+    # encourage various macros to use fat functions
+    AC_DEFINE_UNQUOTED(HAVE_NATIVE_mpn_$tmp_fbase)
+  done
+
+  echo "" >>fat.h
+  echo "/* variable thresholds */" >>fat.h
+  for tmp_tn in $fat_thresholds; do
+    echo "#undef  $tmp_tn" >>fat.h
+    echo "#define $tmp_tn  CPUVEC_THRESHOLD (`echo $tmp_tn | tr [A-Z] [a-z]`)" >>fat.h
+  done
+
+  echo "
+/* Copy all fields into __gmpn_cpuvec.
+   memcpy is not used because it might operate byte-wise (depending on its
+   implementation), and we need the function pointer writes to be atomic.
+   "volatile" discourages the compiler from trying to optimize this.  */
+#define CPUVEC_INSTALL(vec) \\
+  do { \\
+    volatile struct cpuvec_t *p = &__gmpn_cpuvec; \\" >>fat.h
+  for tmp_fn in $fat_functions; do
+    GMP_FILE_TO_FUNCTION(tmp_fbase,tmp_fn)
+    echo "    p->$tmp_fbase = vec.$tmp_fbase; \\" >>fat.h
+  done
+  for tmp_tn in $fat_thresholds; do
+    tmp_field_name=`echo $tmp_tn | tr [[A-Z]] [[a-z]]`
+    echo "    p->$tmp_field_name = vec.$tmp_field_name; \\" >>fat.h
+  done
+  echo "  } while (0)" >>fat.h
+
+  echo "
+/* A helper to check all fields are filled. */
+#define ASSERT_CPUVEC(vec) \\
+  do { \\" >>fat.h
+  for tmp_fn in $fat_functions; do
+    GMP_FILE_TO_FUNCTION(tmp_fbase,tmp_fn)
+    echo "    ASSERT (vec.$tmp_fbase != NULL); \\" >>fat.h
+  done
+  for tmp_tn in $fat_thresholds; do
+    tmp_field_name=`echo $tmp_tn | tr [[A-Z]] [[a-z]]`
+    echo "    ASSERT (vec.$tmp_field_name != 0); \\" >>fat.h
+  done
+  echo "  } while (0)" >>fat.h
+
+  echo "
+/* Call ITERATE(field) for each fat threshold field. */
+#define ITERATE_FAT_THRESHOLDS() \\
+  do { \\" >>fat.h
+  for tmp_tn in $fat_thresholds; do
+    tmp_field_name=`echo $tmp_tn | tr [[A-Z]] [[a-z]]`
+    echo "    ITERATE ($tmp_tn, $tmp_field_name); \\" >>fat.h
+  done
+  echo "  } while (0)" >>fat.h
+
+  for tmp_dir in $fat_path; do
+    CPUVEC_SETUP=
+    THRESH_ASM_SETUP=
+    echo "" >>fat.h
+    GMP_FAT_SUFFIX(tmp_suffix, $tmp_dir)
+
+    # In order to keep names unique on a DOS 8.3 filesystem, use a prefix
+    # (rather than a suffix) for the generated file names, and abbreviate.
+    case $tmp_suffix in
+      pentium)       tmp_prefix=p   ;;
+      pentium_mmx)   tmp_prefix=pm  ;;
+      p6_mmx)        tmp_prefix=p2  ;;
+      p6_p3mmx)      tmp_prefix=p3  ;;
+      pentium4)      tmp_prefix=p4  ;;
+      pentium4_mmx)  tmp_prefix=p4m ;;
+      pentium4_sse2) tmp_prefix=p4s ;;
+      k6_mmx)        tmp_prefix=k6m ;;
+      k6_k62mmx)     tmp_prefix=k62 ;;
+      k7_mmx)        tmp_prefix=k7m ;;
+      *)             tmp_prefix=$tmp_suffix ;;
+    esac
+
+    # Extract desired thresholds from gmp-mparam.h file in this directory,
+    # if present.
+    tmp_mparam=$srcdir/mpn/$tmp_dir/gmp-mparam.h
+    if test -f $tmp_mparam; then
+      for tmp_tn in $fat_thresholds; do
+        tmp_thresh=`sed -n "s/^#define $tmp_tn[        ]*\\([0-9][0-9]*\\).*$/\\1/p" $tmp_mparam`
+        if test -n "$tmp_thresh"; then
+          THRESH_ASM_SETUP=["${THRESH_ASM_SETUP}define($tmp_tn,$tmp_thresh)
+"]
+          CPUVEC_SETUP="$CPUVEC_SETUP    decided_cpuvec.`echo $tmp_tn | tr [[A-Z]] [[a-z]]` = $tmp_thresh; \\
+"
+          eval tmp_limit=\$${tmp_tn}_LIMIT
+          if test -z "$tmp_limit"; then
+            tmp_limit=0
+          fi
+          if test $tmp_thresh -gt $tmp_limit; then
+            eval ${tmp_tn}_LIMIT=$tmp_thresh
+          fi
+        fi
+      done
+    fi
+
+    for tmp_fn in $fat_functions; do
+      GMP_MULFUNC_CHOICES
+
+      for tmp_base in $tmp_fn $tmp_mulfunc; do
+        for tmp_ext in MPN_SUFFIXES; do
+          tmp_file=$srcdir/mpn/$tmp_dir/$tmp_base.$tmp_ext
+          if test -f $tmp_file; then
+
+           # If the host uses a non-standard ABI, check if tmp_file supports it
+           #
+           if test -n "$GMP_NONSTD_ABI" && test $tmp_ext != "c"; then
+             abi=[`sed -n 's/^[        ]*ABI_SUPPORT(\(.*\))/\1/p' $tmp_file `]
+             if echo "$abi" | grep -q "\\b${GMP_NONSTD_ABI}\\b"; then
+               true
+             else
+               continue
+             fi
+           fi
+
+            mpn_objects="$mpn_objects ${tmp_prefix}_$tmp_fn.lo"
+            mpn_objs_in_libgmp="$mpn_objs_in_libgmp mpn/${tmp_prefix}_$tmp_fn.lo"
+
+            GMP_FILE_TO_FUNCTION(tmp_fbase,tmp_fn)
+
+            # carry-in variant, eg. divrem_1c or modexact_1c_odd
+            case $tmp_fbase in
+              *_1*) tmp_fbasec=`echo $tmp_fbase | sed 's/_1/_1c/'` ;;
+              *)    tmp_fbasec=${tmp_fbase}c ;;
+            esac
+
+            # Create a little file doing an include from srcdir.  The
+            # OPERATION and renamings aren't all needed all the time, but
+            # they don't hurt if unused.
+            #
+            # FIXME: Should generate these via config.status commands.
+            # Would need them all in one AC_CONFIG_COMMANDS though, since
+            # that macro doesn't accept a set of separate commands generated
+            # by shell code.
+            #
+            case $tmp_ext in
+              asm)
+                # hide the d-n-l from autoconf's error checking
+                tmp_d_n_l=d""nl
+                echo ["$tmp_d_n_l  mpn_$tmp_fbase - from $tmp_dir directory for fat binary.
+$tmp_d_n_l  Generated by configure - DO NOT EDIT.
+
+define(OPERATION_$tmp_fn)
+define(__gmpn_$tmp_fbase, __gmpn_${tmp_fbase}_$tmp_suffix)
+define(__gmpn_$tmp_fbasec,__gmpn_${tmp_fbasec}_${tmp_suffix})
+define(__gmpn_preinv_${tmp_fbase},__gmpn_preinv_${tmp_fbase}_${tmp_suffix})
+define(__gmpn_${tmp_fbase}_cps,__gmpn_${tmp_fbase}_cps_${tmp_suffix})
+
+$tmp_d_n_l  For k6 and k7 gcd_1 calling their corresponding mpn_modexact_1_odd
+ifdef(\`__gmpn_modexact_1_odd',,
+\`define(__gmpn_modexact_1_odd,__gmpn_modexact_1_odd_${tmp_suffix})')
+
+$THRESH_ASM_SETUP
+include][($mpn_relative_top_srcdir/mpn/$tmp_dir/$tmp_base.asm)
+"] >mpn/${tmp_prefix}_$tmp_fn.asm
+                ;;
+              c)
+                echo ["/* mpn_$tmp_fbase - from $tmp_dir directory for fat binary.
+   Generated by configure - DO NOT EDIT. */
+
+#define OPERATION_$tmp_fn 1
+#define __gmpn_$tmp_fbase           __gmpn_${tmp_fbase}_$tmp_suffix
+#define __gmpn_$tmp_fbasec          __gmpn_${tmp_fbasec}_${tmp_suffix}
+#define __gmpn_preinv_${tmp_fbase}  __gmpn_preinv_${tmp_fbase}_${tmp_suffix}
+#define __gmpn_${tmp_fbase}_cps     __gmpn_${tmp_fbase}_cps_${tmp_suffix}
+
+#include \"$mpn_relative_top_srcdir/mpn/$tmp_dir/$tmp_base.c\"
+"] >mpn/${tmp_prefix}_$tmp_fn.c
+                ;;
+            esac
+
+            # Prototype, and append to CPUVEC_SETUP for this directory.
+            echo "DECL_$tmp_fbase (__gmpn_${tmp_fbase}_$tmp_suffix);" >>fat.h
+            CPUVEC_SETUP="$CPUVEC_SETUP    decided_cpuvec.$tmp_fbase = __gmpn_${tmp_fbase}_${tmp_suffix}; \\
+"
+            # Ditto for any preinv variant (preinv_divrem_1, preinv_mod_1).
+            if grep "^PROLOGUE(mpn_preinv_$tmp_fn)" $tmp_file >/dev/null; then
+              echo "DECL_preinv_$tmp_fbase (__gmpn_preinv_${tmp_fbase}_$tmp_suffix);" >>fat.h
+              CPUVEC_SETUP="$CPUVEC_SETUP    decided_cpuvec.preinv_$tmp_fbase = __gmpn_preinv_${tmp_fbase}_${tmp_suffix}; \\
+"
+            fi
+
+            # Ditto for any mod_1...cps variant
+            if grep "^PROLOGUE(mpn_${tmp_fbase}_cps)" $tmp_file >/dev/null; then
+              echo "DECL_${tmp_fbase}_cps (__gmpn_${tmp_fbase}_cps_$tmp_suffix);" >>fat.h
+              CPUVEC_SETUP="$CPUVEC_SETUP    decided_cpuvec.${tmp_fbase}_cps = __gmpn_${tmp_fbase}_cps_${tmp_suffix}; \\
+"
+            fi
+          fi
+        done
+      done
+    done
+
+    # Emit CPUVEC_SETUP for this directory
+    echo "" >>fat.h
+    echo "#define CPUVEC_SETUP_$tmp_suffix \\" >>fat.h
+    echo "  do { \\" >>fat.h
+    echo "$CPUVEC_SETUP  } while (0)" >>fat.h
+  done
+
+  # Emit threshold limits
+  echo "" >>fat.h
+  for tmp_tn in $fat_thresholds; do
+    eval tmp_limit=\$${tmp_tn}_LIMIT
+    echo "#define ${tmp_tn}_LIMIT  $tmp_limit" >>fat.h
+  done
+fi
+
+
+# Normal binary setups.
+#
+
+for tmp_ext in MPN_SUFFIXES; do
+  eval found_$tmp_ext=no
+done
+
+for tmp_fn in $gmp_mpn_functions; do
+  for tmp_ext in MPN_SUFFIXES; do
+    test "$no_create" = yes || rm -f mpn/$tmp_fn.$tmp_ext
+  done
+
+  # mpn_preinv_divrem_1 might have been provided by divrem_1.asm, likewise
+  # mpn_preinv_mod_1 by mod_1.asm.
+  case $tmp_fn in
+  pre_divrem_1)
+    if test "$HAVE_NATIVE_mpn_preinv_divrem_1" = yes; then continue; fi ;;
+  pre_mod_1)
+    if test "$HAVE_NATIVE_mpn_preinv_mod_1" = yes; then continue; fi ;;
+  esac
+
+  GMP_MULFUNC_CHOICES
+
+  found=no
+  for tmp_dir in $path; do
+    for tmp_base in $tmp_fn $tmp_mulfunc; do
+      for tmp_ext in MPN_SUFFIXES; do
+        tmp_file=$srcdir/mpn/$tmp_dir/$tmp_base.$tmp_ext
+        if test -f $tmp_file; then
+
+          # For a nails build, check if the file supports our nail bits.
+          # Generic code always supports all nails.
+          #
+          # FIXME: When a multi-function file is selected to provide one of
+          # the nails-neutral routines, like logops_n for and_n, the
+          # PROLOGUE grepping will create HAVE_NATIVE_mpn_<foo> defines for
+          # all functions in that file, even if they haven't all been
+          # nailified.  Not sure what to do about this, it's only really a
+          # problem for logops_n, and it's not too terrible to insist those
+          # get nailified always.
+          #
+          if test $GMP_NAIL_BITS != 0 && test $tmp_dir != generic; then
+            case $tmp_fn in
+              and_n | ior_n | xor_n | andn_n | \
+              copyi | copyd | \
+              popcount | hamdist | \
+              udiv | udiv_w_sdiv | umul | \
+              cntlz | invert_limb)
+                # these operations are either unaffected by nails or defined
+                # to operate on full limbs
+                ;;
+              *)
+                nails=[`sed -n 's/^[   ]*NAILS_SUPPORT(\(.*\))/\1/p' $tmp_file `]
+                for n in $nails; do
+                  case $n in
+                  *-*)
+                    n_start=`echo "$n" | sed -n 's/\(.*\)-.*/\1/p'`
+                    n_end=`echo "$n" | sed -n 's/.*-\(.*\)/\1/p'`
+                    ;;
+                  *)
+                    n_start=$n
+                    n_end=$n
+                    ;;
+                  esac
+                  if test $GMP_NAIL_BITS -ge $n_start && test $GMP_NAIL_BITS -le $n_end; then
+                    found=yes
+                    break
+                  fi
+                done
+                if test $found != yes; then
+                  continue
+                fi
+                ;;
+            esac
+          fi
+
+         # If the host uses a non-standard ABI, check if tmp_file supports it
+         #
+         if test -n "$GMP_NONSTD_ABI" && test $tmp_ext != "c"; then
+           abi=[`sed -n 's/^[  ]*ABI_SUPPORT(\(.*\))/\1/p' $tmp_file `]
+           if echo "$abi" | grep -q "\\b${GMP_NONSTD_ABI}\\b"; then
+             true
+           else
+             continue
+           fi
+         fi
+
+          found=yes
+          eval found_$tmp_ext=yes
+
+          if test $tmp_ext = c; then
+            tmp_u='$U'
+          else
+            tmp_u=
+          fi
+
+          mpn_objects="$mpn_objects $tmp_fn$tmp_u.lo"
+          mpn_objs_in_libgmp="$mpn_objs_in_libgmp mpn/$tmp_fn$tmp_u.lo"
+          AC_CONFIG_LINKS(mpn/$tmp_fn.$tmp_ext:mpn/$tmp_dir/$tmp_base.$tmp_ext)
+          gmp_srclinks="$gmp_srclinks mpn/$tmp_fn.$tmp_ext"
+
+          # Duplicate AC_DEFINEs are harmless, so it doesn't matter
+          # that multi-function files get grepped here repeatedly.
+          # The PROLOGUE pattern excludes the optional second parameter.
+          gmp_ep=[`
+            sed -n 's/^[       ]*MULFUNC_PROLOGUE(\(.*\))/\1/p' $tmp_file ;
+            sed -n 's/^[       ]*PROLOGUE(\([^,]*\).*)/\1/p' $tmp_file
+          `]
+          for gmp_tmp in $gmp_ep; do
+            AC_DEFINE_UNQUOTED(HAVE_NATIVE_$gmp_tmp)
+            eval HAVE_NATIVE_$gmp_tmp=yes
+          done
+
+          case $tmp_fn in
+          sqr_basecase) sqr_basecase_source=$tmp_file ;;
+          esac
+
+          break
+        fi
+      done
+      if test $found = yes; then break ; fi
+    done
+    if test $found = yes; then break ; fi
+  done
+
+  if test $found = no; then
+    for tmp_optional in $gmp_mpn_functions_optional; do
+      if test $tmp_optional = $tmp_fn; then
+        found=yes
+      fi
+    done
+    if test $found = no; then
+      AC_MSG_ERROR([no version of $tmp_fn found in path: $path])
+    fi
+  fi
+done
+
+# All cycle counters are .asm files currently
+if test -n "$SPEED_CYCLECOUNTER_OBJ"; then
+  found_asm=yes
+fi
+
+dnl  The following list only needs to have templates for those defines which
+dnl  are going to be tested by the code, there's no need to have every
+dnl  possible mpn routine.
+
+AH_VERBATIM([HAVE_NATIVE],
+[/* Define to 1 each of the following for which a native (ie. CPU specific)
+    implementation of the corresponding routine exists.  */
+#undef HAVE_NATIVE_mpn_add_n
+#undef HAVE_NATIVE_mpn_add_n_sub_n
+#undef HAVE_NATIVE_mpn_add_nc
+#undef HAVE_NATIVE_mpn_addaddmul_1msb0
+#undef HAVE_NATIVE_mpn_addlsh1_n
+#undef HAVE_NATIVE_mpn_addlsh2_n
+#undef HAVE_NATIVE_mpn_addlsh_n
+#undef HAVE_NATIVE_mpn_addlsh1_nc
+#undef HAVE_NATIVE_mpn_addlsh2_nc
+#undef HAVE_NATIVE_mpn_addlsh_nc
+#undef HAVE_NATIVE_mpn_addlsh1_n_ip1
+#undef HAVE_NATIVE_mpn_addlsh2_n_ip1
+#undef HAVE_NATIVE_mpn_addlsh_n_ip1
+#undef HAVE_NATIVE_mpn_addlsh1_nc_ip1
+#undef HAVE_NATIVE_mpn_addlsh2_nc_ip1
+#undef HAVE_NATIVE_mpn_addlsh_nc_ip1
+#undef HAVE_NATIVE_mpn_addlsh1_n_ip2
+#undef HAVE_NATIVE_mpn_addlsh2_n_ip2
+#undef HAVE_NATIVE_mpn_addlsh_n_ip2
+#undef HAVE_NATIVE_mpn_addlsh1_nc_ip2
+#undef HAVE_NATIVE_mpn_addlsh2_nc_ip2
+#undef HAVE_NATIVE_mpn_addlsh_nc_ip2
+#undef HAVE_NATIVE_mpn_addmul_1c
+#undef HAVE_NATIVE_mpn_addmul_2
+#undef HAVE_NATIVE_mpn_addmul_3
+#undef HAVE_NATIVE_mpn_addmul_4
+#undef HAVE_NATIVE_mpn_addmul_5
+#undef HAVE_NATIVE_mpn_addmul_6
+#undef HAVE_NATIVE_mpn_addmul_7
+#undef HAVE_NATIVE_mpn_addmul_8
+#undef HAVE_NATIVE_mpn_addmul_2s
+#undef HAVE_NATIVE_mpn_and_n
+#undef HAVE_NATIVE_mpn_andn_n
+#undef HAVE_NATIVE_mpn_bdiv_dbm1c
+#undef HAVE_NATIVE_mpn_bdiv_q_1
+#undef HAVE_NATIVE_mpn_pi1_bdiv_q_1
+#undef HAVE_NATIVE_mpn_cnd_add_n
+#undef HAVE_NATIVE_mpn_cnd_sub_n
+#undef HAVE_NATIVE_mpn_com
+#undef HAVE_NATIVE_mpn_copyd
+#undef HAVE_NATIVE_mpn_copyi
+#undef HAVE_NATIVE_mpn_div_qr_1n_pi1
+#undef HAVE_NATIVE_mpn_div_qr_2
+#undef HAVE_NATIVE_mpn_divexact_1
+#undef HAVE_NATIVE_mpn_divexact_by3c
+#undef HAVE_NATIVE_mpn_divrem_1
+#undef HAVE_NATIVE_mpn_divrem_1c
+#undef HAVE_NATIVE_mpn_divrem_2
+#undef HAVE_NATIVE_mpn_gcd_1
+#undef HAVE_NATIVE_mpn_hamdist
+#undef HAVE_NATIVE_mpn_invert_limb
+#undef HAVE_NATIVE_mpn_ior_n
+#undef HAVE_NATIVE_mpn_iorn_n
+#undef HAVE_NATIVE_mpn_lshift
+#undef HAVE_NATIVE_mpn_lshiftc
+#undef HAVE_NATIVE_mpn_lshsub_n
+#undef HAVE_NATIVE_mpn_mod_1
+#undef HAVE_NATIVE_mpn_mod_1_1p
+#undef HAVE_NATIVE_mpn_mod_1c
+#undef HAVE_NATIVE_mpn_mod_1s_2p
+#undef HAVE_NATIVE_mpn_mod_1s_4p
+#undef HAVE_NATIVE_mpn_mod_34lsub1
+#undef HAVE_NATIVE_mpn_modexact_1_odd
+#undef HAVE_NATIVE_mpn_modexact_1c_odd
+#undef HAVE_NATIVE_mpn_mul_1
+#undef HAVE_NATIVE_mpn_mul_1c
+#undef HAVE_NATIVE_mpn_mul_2
+#undef HAVE_NATIVE_mpn_mul_3
+#undef HAVE_NATIVE_mpn_mul_4
+#undef HAVE_NATIVE_mpn_mul_5
+#undef HAVE_NATIVE_mpn_mul_6
+#undef HAVE_NATIVE_mpn_mul_basecase
+#undef HAVE_NATIVE_mpn_nand_n
+#undef HAVE_NATIVE_mpn_nior_n
+#undef HAVE_NATIVE_mpn_popcount
+#undef HAVE_NATIVE_mpn_preinv_divrem_1
+#undef HAVE_NATIVE_mpn_preinv_mod_1
+#undef HAVE_NATIVE_mpn_redc_1
+#undef HAVE_NATIVE_mpn_redc_2
+#undef HAVE_NATIVE_mpn_rsblsh1_n
+#undef HAVE_NATIVE_mpn_rsblsh2_n
+#undef HAVE_NATIVE_mpn_rsblsh_n
+#undef HAVE_NATIVE_mpn_rsblsh1_nc
+#undef HAVE_NATIVE_mpn_rsblsh2_nc
+#undef HAVE_NATIVE_mpn_rsblsh_nc
+#undef HAVE_NATIVE_mpn_rsh1add_n
+#undef HAVE_NATIVE_mpn_rsh1add_nc
+#undef HAVE_NATIVE_mpn_rsh1sub_n
+#undef HAVE_NATIVE_mpn_rsh1sub_nc
+#undef HAVE_NATIVE_mpn_rshift
+#undef HAVE_NATIVE_mpn_sqr_basecase
+#undef HAVE_NATIVE_mpn_sqr_diagonal
+#undef HAVE_NATIVE_mpn_sqr_diag_addlsh1
+#undef HAVE_NATIVE_mpn_sub_n
+#undef HAVE_NATIVE_mpn_sub_nc
+#undef HAVE_NATIVE_mpn_sublsh1_n
+#undef HAVE_NATIVE_mpn_sublsh2_n
+#undef HAVE_NATIVE_mpn_sublsh_n
+#undef HAVE_NATIVE_mpn_sublsh1_nc
+#undef HAVE_NATIVE_mpn_sublsh2_nc
+#undef HAVE_NATIVE_mpn_sublsh_nc
+#undef HAVE_NATIVE_mpn_sublsh1_n_ip1
+#undef HAVE_NATIVE_mpn_sublsh2_n_ip1
+#undef HAVE_NATIVE_mpn_sublsh_n_ip1
+#undef HAVE_NATIVE_mpn_sublsh1_nc_ip1
+#undef HAVE_NATIVE_mpn_sublsh2_nc_ip1
+#undef HAVE_NATIVE_mpn_sublsh_nc_ip1
+#undef HAVE_NATIVE_mpn_submul_1c
+#undef HAVE_NATIVE_mpn_tabselect
+#undef HAVE_NATIVE_mpn_udiv_qrnnd
+#undef HAVE_NATIVE_mpn_udiv_qrnnd_r
+#undef HAVE_NATIVE_mpn_umul_ppmm
+#undef HAVE_NATIVE_mpn_umul_ppmm_r
+#undef HAVE_NATIVE_mpn_xor_n
+#undef HAVE_NATIVE_mpn_xnor_n])
+
+
+# Don't demand an m4 unless it's actually needed.
+if test $found_asm = yes; then
+  GMP_PROG_M4
+  GMP_M4_M4WRAP_SPURIOUS
+# else
+# It's unclear why this m4-not-needed stuff was ever done.
+#  if test -z "$M4" ; then
+#    M4=m4-not-needed
+#  fi
+fi
+
+# Only do the GMP_ASM checks if there's a .S or .asm wanting them.
+if test $found_asm = no && test $found_S = no; then
+  gmp_asm_syntax_testing=no
+fi
+
+if test "$gmp_asm_syntax_testing" != no; then
+  GMP_ASM_TEXT
+  GMP_ASM_DATA
+  GMP_ASM_LABEL_SUFFIX
+  GMP_ASM_GLOBL
+  GMP_ASM_GLOBL_ATTR
+  GMP_ASM_UNDERSCORE
+  GMP_ASM_RODATA
+  GMP_ASM_TYPE
+  GMP_ASM_SIZE
+  GMP_ASM_LSYM_PREFIX
+  GMP_ASM_W32
+  GMP_ASM_ALIGN_LOG
+
+  case $host in
+    hppa*-*-*)
+      # for both pa32 and pa64
+      GMP_INCLUDE_MPN(pa32/pa-defs.m4)
+      ;;
+    IA64_PATTERN)
+      GMP_ASM_IA64_ALIGN_OK
+      ;;
+    M68K_PATTERN)
+      GMP_ASM_M68K_INSTRUCTION
+      GMP_ASM_M68K_ADDRESSING
+      GMP_ASM_M68K_BRANCHES
+      ;;
+    [powerpc*-*-* | power[3-9]-*-*])
+      GMP_ASM_POWERPC_PIC_ALWAYS
+      GMP_ASM_POWERPC_R_REGISTERS
+      GMP_INCLUDE_MPN(powerpc32/powerpc-defs.m4)
+
+      # Check for Linux ELFv2 ABI
+      AC_EGREP_CPP(yes,
+[#if _CALL_ELF == 2
+yes
+#endif],
+      [GMP_DEFINE_RAW(["define(<ELFv2_ABI>)"])])
+
+      case $host in
+        *-*-aix*)
+         case $ABI in
+           mode64)      GMP_INCLUDE_MPN(powerpc64/aix.m4) ;;
+            *)           GMP_INCLUDE_MPN(powerpc32/aix.m4) ;;
+          esac
+          ;;
+        *-*-linux* | *-*-*bsd*)
+         case $ABI in
+           mode64)      GMP_INCLUDE_MPN(powerpc64/elf.m4) ;;
+           mode32 | 32) GMP_INCLUDE_MPN(powerpc32/elf.m4) ;;
+          esac
+          ;;
+        *-*-darwin*)
+         case $ABI in
+           mode64)      GMP_INCLUDE_MPN(powerpc64/darwin.m4) ;;
+           mode32 | 32) GMP_INCLUDE_MPN(powerpc32/darwin.m4) ;;
+          esac
+          ;;
+        *)
+         # Assume unrecognized operating system is the powerpc eABI
+          GMP_INCLUDE_MPN(powerpc32/eabi.m4)
+         ;;
+      esac
+      ;;
+    power*-*-aix*)
+      GMP_INCLUDE_MPN(powerpc32/aix.m4)
+      ;;
+    *sparc*-*-*)
+      case $ABI in
+        64)
+          GMP_ASM_SPARC_REGISTER
+          ;;
+      esac
+      GMP_ASM_SPARC_GOTDATA
+      GMP_ASM_SPARC_SHARED_THUNKS
+      ;;
+    X86_PATTERN | X86_64_PATTERN)
+      GMP_ASM_ALIGN_FILL_0x90
+      case $ABI in
+        32)
+          GMP_INCLUDE_MPN(x86/x86-defs.m4)
+          AC_DEFINE(HAVE_HOST_CPU_FAMILY_x86)
+          GMP_ASM_COFF_TYPE
+          GMP_ASM_X86_GOT_UNDERSCORE
+          GMP_ASM_X86_SHLDL_CL
+         case $enable_profiling in
+           prof | gprof)  GMP_ASM_X86_MCOUNT ;;
+         esac
+         case $host in
+           *-*-darwin*)
+             GMP_INCLUDE_MPN(x86/darwin.m4) ;;
+         esac
+          ;;
+        64|x32)
+          GMP_INCLUDE_MPN(x86_64/x86_64-defs.m4)
+          AC_DEFINE(HAVE_HOST_CPU_FAMILY_x86_64)
+         case $host in
+           *-*-darwin*)
+             GMP_INCLUDE_MPN(x86_64/darwin.m4) ;;
+           *-*-mingw* | *-*-cygwin)
+             GMP_INCLUDE_MPN(x86_64/dos64.m4) ;;
+           *-openbsd*)
+             GMP_DEFINE_RAW(["define(<OPENBSD>,1)"]) ;;
+         esac
+          ;;
+      esac
+      ;;
+  esac
+fi
+
+# For --enable-minithres, prepend "minithres" to path so that its special
+# gmp-mparam.h will be used.
+if test $enable_minithres = yes; then
+  path="minithres $path"
+fi
+
+# Create link for gmp-mparam.h.
+gmp_mparam_source=
+for gmp_mparam_dir in $path; do
+  test "$no_create" = yes || rm -f gmp-mparam.h
+  tmp_file=$srcdir/mpn/$gmp_mparam_dir/gmp-mparam.h
+  if test -f $tmp_file; then
+    AC_CONFIG_LINKS(gmp-mparam.h:mpn/$gmp_mparam_dir/gmp-mparam.h)
+    gmp_srclinks="$gmp_srclinks gmp-mparam.h"
+    gmp_mparam_source=$tmp_file
+    break
+  fi
+done
+if test -z "$gmp_mparam_source"; then
+  AC_MSG_ERROR([no version of gmp-mparam.h found in path: $path])
+fi
+
+# For a helpful message from tune/tuneup.c
+gmp_mparam_suggest=$gmp_mparam_source
+if test "$gmp_mparam_dir" = generic; then
+  for i in $path; do break; done
+  if test "$i" != generic; then
+    gmp_mparam_suggest="new file $srcdir/mpn/$i/gmp-mparam.h"
+  fi
+fi
+AC_DEFINE_UNQUOTED(GMP_MPARAM_H_SUGGEST, "$gmp_mparam_source",
+[The gmp-mparam.h file (a string) the tune program should suggest updating.])
+
+
+# Copy relevant parameters from gmp-mparam.h to config.m4.
+# We only do this for parameters that are used by some assembly files.
+# Fat binaries do this on a per-file basis, so skip in that case.
+#
+if test -z "$fat_path"; then
+  for i in SQR_TOOM2_THRESHOLD BMOD_1_TO_MOD_1_THRESHOLD SHLD_SLOW SHRD_SLOW; do
+    value=`sed -n 's/^#define '$i'[    ]*\([0-9][0-9]*\).*$/\1/p' $gmp_mparam_source`
+    if test -n "$value"; then
+      GMP_DEFINE_RAW(["define(<$i>,<$value>)"])
+    fi
+  done
+fi
+
+
+# Sizes of some types, needed at preprocessing time.
+#
+# FIXME: The assumption that GMP_LIMB_BITS is 8*sizeof(mp_limb_t) might
+# be slightly rash, but it's true everywhere we know of and ought to be true
+# of any sensible system.  In a generic C build, grepping LONG_BIT out of
+# <limits.h> might be an alternative, for maximum portability.
+#
+AC_CHECK_SIZEOF(void *)
+AC_CHECK_SIZEOF(unsigned short)
+AC_CHECK_SIZEOF(unsigned)
+AC_CHECK_SIZEOF(unsigned long)
+AC_CHECK_SIZEOF(mp_limb_t, , GMP_INCLUDE_GMP_H)
+if test "$ac_cv_sizeof_mp_limb_t" = 0; then
+  AC_MSG_ERROR([Oops, mp_limb_t doesn't seem to work])
+fi
+AC_SUBST(GMP_LIMB_BITS, `expr 8 \* $ac_cv_sizeof_mp_limb_t`)
+GMP_DEFINE_RAW(["define(<SIZEOF_UNSIGNED>,<$ac_cv_sizeof_unsigned>)"])
+
+# Check compiler limb size matches gmp-mparam.h
+#
+# FIXME: Some of the cycle counter objects in the tune directory depend on
+# the size of ulong, it'd be possible to check that here, though a mismatch
+# probably wouldn't want to be fatal, none of the libgmp assembler code
+# depends on ulong.
+#
+mparam_bits=[`sed -n 's/^#define GMP_LIMB_BITS[        ][      ]*\([0-9]*\).*$/\1/p' $gmp_mparam_source`]
+if test -n "$mparam_bits" && test "$mparam_bits" -ne $GMP_LIMB_BITS; then
+  if test "$test_CFLAGS" = set; then
+    AC_MSG_ERROR([Oops, mp_limb_t is $GMP_LIMB_BITS bits, but the assembler code
+in this configuration expects $mparam_bits bits.
+You appear to have set \$CFLAGS, perhaps you also need to tell GMP the
+intended ABI, see "ABI and ISA" in the manual.])
+  else
+    AC_MSG_ERROR([Oops, mp_limb_t is $GMP_LIMB_BITS bits, but the assembler code
+in this configuration expects $mparam_bits bits.])
+  fi
+fi
+
+GMP_DEFINE_RAW(["define(<GMP_LIMB_BITS>,$GMP_LIMB_BITS)"])
+GMP_DEFINE_RAW(["define(<GMP_NAIL_BITS>,$GMP_NAIL_BITS)"])
+GMP_DEFINE_RAW(["define(<GMP_NUMB_BITS>,eval(GMP_LIMB_BITS-GMP_NAIL_BITS))"])
+
+
+AC_SUBST(mpn_objects)
+AC_SUBST(mpn_objs_in_libgmp)
+AC_SUBST(gmp_srclinks)
+
+
+# A recompiled sqr_basecase for use in the tune program, if necessary.
+TUNE_SQR_OBJ=
+test -d tune || mkdir tune
+case $sqr_basecase_source in
+  *.asm)
+    sqr_max=[`sed -n 's/^def...(SQR_TOOM2_THRESHOLD_MAX, *\([0-9]*\))/\1/p' $sqr_basecase_source`]
+    if test -n "$sqr_max"; then
+      TUNE_SQR_OBJ=sqr_asm.o
+      AC_DEFINE_UNQUOTED(TUNE_SQR_TOOM2_MAX,$sqr_max,
+      [Maximum size the tune program can test for SQR_TOOM2_THRESHOLD])
+    fi
+    cat >tune/sqr_basecase.c <<EOF
+/* not sure that an empty file can compile, so put in a dummy */
+int sqr_basecase_dummy;
+EOF
+    ;;
+  *.c)
+    TUNE_SQR_OBJ=
+    AC_DEFINE(TUNE_SQR_TOOM2_MAX,SQR_TOOM2_MAX_GENERIC)
+    cat >tune/sqr_basecase.c <<EOF
+#define TUNE_PROGRAM_BUILD 1
+#define TUNE_PROGRAM_BUILD_SQR 1
+#include "mpn/sqr_basecase.c"
+EOF
+    ;;
+esac
+AC_SUBST(TUNE_SQR_OBJ)
+
+
+# Configs for demos/pexpr.c.
+#
+AC_CONFIG_FILES(demos/pexpr-config.h:demos/pexpr-config-h.in)
+GMP_SUBST_CHECK_FUNCS(clock, cputime, getrusage, gettimeofday, sigaction, sigaltstack, sigstack)
+GMP_SUBST_CHECK_HEADERS(sys/resource.h)
+AC_CHECK_TYPES([stack_t], HAVE_STACK_T_01=1, HAVE_STACK_T_01=0,
+               [#include <signal.h>])
+AC_SUBST(HAVE_STACK_T_01)
+
+# Configs for demos/calc directory
+#
+# AC_SUBST+AC_CONFIG_FILES is used for calc-config.h, rather than AC_DEFINE+
+# AC_CONFIG_HEADERS, since with the latter automake (1.8) will then put the
+# directory (ie. demos/calc) into $(DEFAULT_INCLUDES) for every Makefile.in,
+# which would look very strange.
+#
+# -lcurses is required by libreadline.  On a typical SVR4 style system this
+# normally doesn't have to be given explicitly, since libreadline.so will
+# have a NEEDED record for it.  But if someone for some reason is using only
+# a static libreadline.a then we must give -lcurses.  Readline (as of
+# version 4.3) doesn't use libtool, so we can't rely on a .la to cover
+# necessary dependencies.
+#
+# On a couple of systems we've seen libreadline available, but the headers
+# not in the default include path, so check for readline/readline.h.  We've
+# also seen readline/history.h missing, not sure if that's just a broken
+# install or a very old version, but check that too.
+#
+AC_CONFIG_FILES(demos/calc/calc-config.h:demos/calc/calc-config-h.in)
+LIBCURSES=
+if test $with_readline != no; then
+  AC_CHECK_LIB(ncurses, tputs, [LIBCURSES=-lncurses],
+    [AC_CHECK_LIB(curses, tputs, [LIBCURSES=-lcurses])])
+fi
+AC_SUBST(LIBCURSES)
+use_readline=$with_readline
+if test $with_readline = detect; then
+  use_readline=no
+  AC_CHECK_LIB(readline, readline,
+    [AC_CHECK_HEADER(readline/readline.h,
+      [AC_CHECK_HEADER(readline/history.h, use_readline=yes)])],
+    , $LIBCURSES)
+  AC_MSG_CHECKING(readline detected)
+  AC_MSG_RESULT($use_readline)
+fi
+if test $use_readline = yes; then
+  AC_SUBST(WITH_READLINE_01, 1)
+  AC_SUBST(LIBREADLINE, -lreadline)
+else
+  WITH_READLINE_01=0
+fi
+AC_PROG_YACC
+AM_PROG_LEX
+
+# Configs for demos/expr directory
+#
+# Libtool already runs an AC_CHECK_TOOL for ranlib, but we give
+# AC_PROG_RANLIB anyway since automake is supposed to complain if it's not
+# called.  (Automake 1.8.4 doesn't, at least not when the only library is in
+# an EXTRA_LIBRARIES.)
+#
+AC_PROG_RANLIB
+
+
+# Create config.m4.
+GMP_FINISH
+
+# Create Makefiles
+# FIXME: Upcoming version of autoconf/automake may not like broken lines.
+#        Right now automake isn't accepting the new AC_CONFIG_FILES scheme.
+
+AC_OUTPUT(Makefile                                                     \
+  mpf/Makefile mpn/Makefile mpq/Makefile                               \
+  mpz/Makefile printf/Makefile scanf/Makefile rand/Makefile cxx/Makefile \
+  tests/Makefile tests/devel/Makefile                                  \
+  tests/mpf/Makefile tests/mpn/Makefile tests/mpq/Makefile             \
+  tests/mpz/Makefile tests/rand/Makefile tests/misc/Makefile           \
+  tests/cxx/Makefile                                                   \
+  doc/Makefile tune/Makefile                                           \
+  demos/Makefile demos/calc/Makefile demos/expr/Makefile               \
+  gmp.h:gmp-h.in)
+
+AC_MSG_NOTICE([summary of build options:
+
+  Version:           ${PACKAGE_STRING}
+  Host type:         ${host}
+  ABI:               ${ABI}
+  Install prefix:    ${prefix}
+  Compiler:          ${CC}
+  Static libraries:  ${enable_static}
+  Shared libraries:  ${enable_shared}
+])
+
+if test x$cross_compiling = xyes ; then
+   case "$host" in
+     *-*-mingw* | *-*-cygwin)
+     if test x$ABI = x64 ; then
+       AC_MSG_NOTICE([If wine64 is installed, use make check TESTS_ENVIRONMENT=wine64.])
+     else
+       AC_MSG_NOTICE([If wine is installed, use make check TESTS_ENVIRONMENT=wine.])
+     fi
+     ;;
+   esac
+fi