Disable -fmerge-all-constants as default.
Summary:
"-fmerge-all-constants" is a non-conforming optimization and should not
be the default. It is also causing miscompiles when building Linux
Kernel (https://lkml.org/lkml/2018/3/20/872).
Fixes PR18538.
Reviewers: rjmccall, rsmith, chandlerc
Reviewed By: rsmith, chandlerc
Subscribers: srhines, cfe-commits
Differential Revision: https://reviews.llvm.org/D45289
llvm-svn: 329300
diff --git a/clang/lib/Frontend/CompilerInvocation.cpp b/clang/lib/Frontend/CompilerInvocation.cpp
index 734349e..45546ac 100644
--- a/clang/lib/Frontend/CompilerInvocation.cpp
+++ b/clang/lib/Frontend/CompilerInvocation.cpp
@@ -605,7 +605,7 @@
Args.hasFlag(OPT_ffine_grained_bitfield_accesses,
OPT_fno_fine_grained_bitfield_accesses, false);
Opts.DwarfDebugFlags = Args.getLastArgValue(OPT_dwarf_debug_flags);
- Opts.MergeAllConstants = !Args.hasArg(OPT_fno_merge_all_constants);
+ Opts.MergeAllConstants = Args.hasArg(OPT_fmerge_all_constants);
Opts.NoCommon = Args.hasArg(OPT_fno_common);
Opts.NoImplicitFloat = Args.hasArg(OPT_no_implicit_float);
Opts.OptimizeSize = getOptimizationLevelSize(Args);