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