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[Driver] Properly support -mglobal-merge using explicit options.

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Follow-up to r234666.  With this, the -m[no-]global-merge options
have the expected behavior. Previously, -mglobal-merge was ignored,
and there was no way of enabling the optimization.

llvm-svn: 234668
This commit is contained in:
Ahmed Bougacha
2015-04-11 00:10:44 +00:00
parent 9638ff9b37
commit 256a869d31
7 changed files with 52 additions and 31 deletions
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clang/lib/Frontend/CompilerInvocation.cpp
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@@ -455,7 +455,6 @@ static bool ParseCodeGenArgs(CodeGenOptions &Opts, ArgList &Args, InputKind IK,
Opts.NoZeroInitializedInBSS = Args.hasArg(OPT_mno_zero_initialized_in_bss);
Opts.BackendOptions = Args.getAllArgValues(OPT_backend_option);
Opts.NumRegisterParameters = getLastArgIntValue(Args, OPT_mregparm, 0, Diags);
Opts.NoGlobalMerge = Args.hasArg(OPT_mno_global_merge);
Opts.NoExecStack = Args.hasArg(OPT_mno_exec_stack);
Opts.FatalWarnings = Args.hasArg(OPT_massembler_fatal_warnings);
Opts.EnableSegmentedStacks = Args.hasArg(OPT_split_stacks);