AArch64: set all processor features from -arch if nothing else present

Darwin's "-arch arm64" option implies full Cyclone CPU, for both architectural
and tuning purposes. So if neither of the explicit options have been given,
forward that on to the proper invocation.

rdar://problem/18906227

llvm-svn: 221631

1 files changed, 6 insertions, 0 deletions

diff --git a/clang/lib/Driver/Tools.cpp b/clang/lib/Driver/Tools.cpp
index ca705c1..042d7b1 100644
--- a/clang/lib/Driver/Tools.cpp
+++ b/clang/lib/Driver/Tools.cpp
@@ -1794,6 +1794,9 @@ static void getAArch64TargetFeatures(const Driver &D, const ArgList &Args,
     success = getAArch64ArchFeaturesFromMarch(D, A->getValue(), Args, Features);
   else if ((A = Args.getLastArg(options::OPT_mcpu_EQ)))
     success = getAArch64ArchFeaturesFromMcpu(D, A->getValue(), Args, Features);
+  else if (Args.hasArg(options::OPT_arch))
+    success = getAArch64ArchFeaturesFromMcpu(D, getAArch64TargetCPU(Args), Args,
+                                             Features);
 
   if (success && (A = Args.getLastArg(options::OPT_mtune_EQ)))
     success =
@@ -1801,6 +1804,9 @@ static void getAArch64TargetFeatures(const Driver &D, const ArgList &Args,
   else if (success && (A = Args.getLastArg(options::OPT_mcpu_EQ)))
     success =
         getAArch64MicroArchFeaturesFromMcpu(D, A->getValue(), Args, Features);
+  else if (Args.hasArg(options::OPT_arch))
+    success = getAArch64MicroArchFeaturesFromMcpu(D, getAArch64TargetCPU(Args),
+                                                  Args, Features);
 
   if (!success)
     D.Diag(diag::err_drv_clang_unsupported) << A->getAsString(Args);