Re-introduce the ctor/dtor alias optimization, this time hidden behind a

command-line option which defaults off.

llvm-svn: 96649

1 files changed, 3 insertions, 0 deletions

diff --git a/clang/lib/Frontend/CompilerInvocation.cpp b/clang/lib/Frontend/CompilerInvocation.cpp
index a193ac87030..64a42bc0ec4 100644
--- a/clang/lib/Frontend/CompilerInvocation.cpp
+++ b/clang/lib/Frontend/CompilerInvocation.cpp
@@ -180,6 +180,8 @@ static void CodeGenOptsToArgs(const CodeGenOptions &Opts,
     Res.push_back("-mrelocation-model");
     Res.push_back(Opts.RelocationModel);
   }
+  if (Opts.CXXCtorDtorAliases)
+    Res.push_back("-mconstructor-aliases");
   if (!Opts.VerifyModule)
     Res.push_back("-disable-llvm-verifier");
 }
@@ -789,6 +791,7 @@ static void ParseCodeGenArgs(CodeGenOptions &Opts, ArgList &Args,
   Opts.SoftFloat = Args.hasArg(OPT_msoft_float);
   Opts.UnwindTables = Args.hasArg(OPT_munwind_tables);
   Opts.RelocationModel = getLastArgValue(Args, OPT_mrelocation_model, "pic");
+  Opts.CXXCtorDtorAliases = Args.hasArg(OPT_mconstructor_aliases);
 
   Opts.MainFileName = getLastArgValue(Args, OPT_main_file_name);
   Opts.VerifyModule = !Args.hasArg(OPT_disable_llvm_verifier);