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-rw-r--r--build/autoconf/compiler-opts.m413
1 files changed, 5 insertions, 8 deletions
diff --git a/build/autoconf/compiler-opts.m4 b/build/autoconf/compiler-opts.m4
index 57a974435..c47d792f4 100644
--- a/build/autoconf/compiler-opts.m4
+++ b/build/autoconf/compiler-opts.m4
@@ -181,18 +181,15 @@ if test "$GNU_CC"; then
if test -z "$CLANG_CC"; then
case "$CC_VERSION" in
- 4.*)
+ 4.* | 5.*)
;;
*)
# 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.
+ # Instead of completely disabling this optimization on newer GCC's,
+ # we'll force them to use level 1 optimization with -flifetime-dse=1.
# Add it first so that a mozconfig can override by setting CFLAGS/CXXFLAGS.
- CFLAGS="-fno-lifetime-dse $CFLAGS"
- CXXFLAGS="-fno-lifetime-dse $CXXFLAGS"
+ CFLAGS="-flifetime-dse=1 $CFLAGS"
+ CXXFLAGS="-flifetime-dse=1 $CXXFLAGS"
;;
esac
fi