gcc3-gcc_visibility.m4

   1 AC_DEFUN([HIDE_INLINES], [
   2     visibility_inlines_hidden=yes
   3     if test "X$CXX" != "X"; then
   4         AC_MSG_CHECKING([whether ${CXX} accepts -fvisbility-inlines-hidden])
   5         visbility_old_cxxflags="$CXXFLAGS"
   6         CXXFLAGS="$CXXFLAGS -fvisibility-inlines-hidden"
   7         AC_TRY_COMPILE(, , , visibility_inlines_hidden=no)
   8         echo $visibility_inlines_hidden
   9         if test "X$visibility_inlines_hidden" = "Xno"; then
  10             CXXFLAGS="$visibility_old_cxxflags"
  11         fi
  12     fi
  13 ])
  14
  15 AC_DEFUN([HIDDEN_ATTRIBUTE], [
  16     if test "X$CC" != "X"; then
  17         AC_MSG_CHECKING([GCC visibility attribute])
  18         AC_TRY_COMPILE(
  19             [int __attribute__((visibility("hidden"))) test();],
  20             [],
  21             AC_DEFINE(HAVE_HIDDEN_ATTRIBUTE, 1, [])
  22             AC_MSG_RESULT(yes),
  23             AC_MSG_RESULT(no)
  24         )
  25     fi
  26 ])