blob: 4dd2a762c94229d47f00b0d87a4c7be9f237e342 (
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diff --git a/build/autoconf/compiler-opts.m4 b/build/autoconf/compiler-opts.m4
--- a/build/autoconf/compiler-opts.m4
+++ b/build/autoconf/compiler-opts.m4
@@ -173,16 +173,34 @@ AC_SUBST([LD_IS_BFD])
if test "$GNU_CC"; then
if test -z "$DEVELOPER_OPTIONS"; then
CFLAGS="$CFLAGS -ffunction-sections -fdata-sections"
CXXFLAGS="$CXXFLAGS -ffunction-sections -fdata-sections"
fi
CFLAGS="$CFLAGS -fno-math-errno"
CXXFLAGS="$CXXFLAGS -fno-exceptions -fno-math-errno"
+
+ if test -z "$CLANG_CC"; then
+ case "$CC_VERSION" in
+ 4.*)
+ ;;
+ *)
+ # Lifetime Dead Store Elimination level 2 (default in GCC6+) breaks Gecko.
+ # Ideally, we'd use -flifetime-dse=1, but that means we'd forcefully
+ # enable it on optimization levels where it would otherwise not be enabled.
+ # So we disable it entirely. But since that would mean inconsistency with
+ # GCC5, which has level 1 depending on optimization level, disable it on
+ # GCC5 as well, because better safe than sorry.
+ # Add it first so that a mozconfig can override by setting CFLAGS/CXXFLAGS.
+ CFLAGS="-fno-lifetime-dse $CFLAGS"
+ CXXFLAGS="-fno-lifetime-dse $CXXFLAGS"
+ ;;
+ esac
+ fi
fi
dnl ========================================================
dnl = Identical Code Folding
dnl ========================================================
MOZ_ARG_DISABLE_BOOL(icf,
[ --disable-icf Disable Identical Code Folding],
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