From cd0d4de7fdd36d2493a9d2c10b946e2b6fada9eb Mon Sep 17 00:00:00 2001
From: =?utf8?q?Arkadiusz=20Mi=C5=9Bkiewicz?= <arekm@maven.pl>
Date: Sun, 26 Jan 2020 01:51:15 +0100
Subject: [PATCH] - parallel build for non-clang (from fc)

---
 firefox.spec | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/firefox.spec b/firefox.spec
index 2932e7f..5a46da9 100644
--- a/firefox.spec
+++ b/firefox.spec
@@ -2127,7 +2127,16 @@ ac_add_options --with-system-zlib
 ac_add_options BINDGEN_CFLAGS="$(pkg-config nspr pixman-1 --cflags)"
 EOF
 
-%{!?with_clang:export MOZ_MAKE_FLAGS="-j1"}
+# On x86_64 architectures, Mozilla can build up to 4 jobs at once in parallel,
+# however builds tend to fail on other arches when building in parallel.
+RPM_BUILD_NR_THREADS=$(echo %{_smp_mflags} | cut -dj -f2)
+%ifarch %{x8864}
+[ -n "RPM_BUILD_NR_THREADS" -a "$RPM_BUILD_NR_THREADS" -gt 4 ] && RPM_BUILD_NR_THREADS=4
+%else
+RPM_BUILD_NR_THREADS=1
+%endif
+export MOZ_MAKE_FLAGS="-j${RPM_BUILD_NR_THREADS}"
+
 export MOZ_SERVICES_SYNC="1"
 %if %{with pgo}
 D=$(( RANDOM % (200 - 100 + 1 ) + 5 ))
-- 
2.43.0