clang-cl: Don't warn about /Oy- being unused in 64-bit builds.

http://reviews.llvm.org/D18392

llvm-svn: 264163

1 files changed, 6 insertions, 0 deletions

diff --git a/clang/lib/Driver/MSVCToolChain.cpp b/clang/lib/Driver/MSVCToolChain.cpp
index 0834be721e1..e0552903aee 100644
--- a/clang/lib/Driver/MSVCToolChain.cpp
+++ b/clang/lib/Driver/MSVCToolChain.cpp
@@ -702,6 +702,12 @@ static void TranslateOptArg(Arg *A, llvm::opt::DerivedArgList &DAL,
         else
           DAL.AddFlagArg(
               A, Opts.getOption(options::OPT_fno_omit_frame_pointer));
+      } else {
+        // Don't warn about /Oy- in 64-bit builds (where
+        // SupportsForcingFramePointer is false).  The flag having no effect
+        // there is a compiler-internal optimization, and people shouldn't have
+        // to special-case their build files for 64-bit clang-cl.
+        A->claim();
       }
       break;
     }