clang-cl: ignore compile-only options in link-only invocations.

Previously we would warn about unused arguments such as /MD when linking.
Clang already has logic to ignore compile-only options, e.g. for -D and -U.
This patch extends that to include clang-cl's compile-only options too.

Also, some clang-cl options should always be ignored. Doing this earlier
means they get ignored both for compilation and link-only invocations.

llvm-svn: 190825

1 files changed, 6 insertions, 1 deletions

diff --git a/clang/lib/Driver/Driver.cpp b/clang/lib/Driver/Driver.cpp
index b1d5e619637..7ad09accd8c 100644
--- a/clang/lib/Driver/Driver.cpp
+++ b/clang/lib/Driver/Driver.cpp
@@ -1268,8 +1268,13 @@ void Driver::BuildActions(const ToolChain &TC, DerivedArgList &Args,
 
   // If we are linking, claim any options which are obviously only used for
   // compilation.
-  if (FinalPhase == phases::Link && PL.size() == 1)
+  if (FinalPhase == phases::Link && PL.size() == 1) {
     Args.ClaimAllArgs(options::OPT_CompileOnly_Group);
+    Args.ClaimAllArgs(options::OPT_cl_compile_Group);
+  }
+
+  // Claim ignored clang-cl options.
+  Args.ClaimAllArgs(options::OPT_cl_ignored_Group);
 }
 
 Action *Driver::ConstructPhaseAction(const ArgList &Args, phases::ID Phase,