Remove the -faltivec alias option and replace it with -maltivec everywhere.

The alias was only ever used on darwin and had some issues there,
and isn't used in practice much. Also fixes a problem with -mno-altivec
not turning off -maltivec.

Also add a diagnostic for faltivec/fno-altivec that directs users to use
maltivec options and include the altivec.h file explicitly.

llvm-svn: 298449

1 files changed, 6 insertions, 0 deletions

diff --git a/clang/lib/Frontend/CompilerInstance.cpp b/clang/lib/Frontend/CompilerInstance.cpp
index f660429e49d..e4a1be61fc9 100644
--- a/clang/lib/Frontend/CompilerInstance.cpp
+++ b/clang/lib/Frontend/CompilerInstance.cpp
@@ -916,6 +916,12 @@ bool CompilerInstance::ExecuteAction(FrontendAction &Act) {
   if (!hasTarget())
     return false;
 
+  // FIXME: Setting this here is less than ideal, but it is set based on a
+  // target option for compatibility and this is immediately after we construct
+  // a target.
+  if (getTarget().hasFeature("altivec"))
+    getLangOpts().AltiVec = 1;
+
   // Create TargetInfo for the other side of CUDA compilation.
   if (getLangOpts().CUDA && !getFrontendOpts().AuxTriple.empty()) {
     auto TO = std::make_shared<TargetOptions>();