Move setting of LangOpts based on target flags out of CompilerInstance

and into TargetInfo::adjust so that it gets called in more places
throughout the compiler (AST serialization in particular).

Should fix PPC modules after removing of faltivec.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@298487 91177308-0d34-0410-b5e6-96231b3b80d8

Author: echristo

include/clang/Basic/TargetInfo.h

@@ -823,8 +823,9 @@ class TargetInfo : public RefCountedBase<TargetInfo> {
   /// \brief Set forced language options.
   ///
   /// Apply changes to the target information with respect to certain
-  /// language options which change the target configuration.
-  virtual void adjust(const LangOptions &Opts);
+  /// language options which change the target configuration and adjust
+  /// the language based on the target options where applicable.
+  virtual void adjust(LangOptions &Opts);
 
   /// \brief Adjust target options based on codegen options.
   virtual void adjustTargetOptions(const CodeGenOptions &CGOpts,

lib/Basic/TargetInfo.cpp

@@ -282,8 +282,9 @@ bool TargetInfo::isTypeSigned(IntType T) {
 
 /// adjust - Set forced language options.
 /// Apply changes to the target information with respect to certain
-/// language options which change the target configuration.
-void TargetInfo::adjust(const LangOptions &Opts) {
+/// language options which change the target configuration and adjust
+/// the language based on the target options where applicable.
+void TargetInfo::adjust(LangOptions &Opts) {
   if (Opts.NoBitFieldTypeAlign)
     UseBitFieldTypeAlignment = false;
   if (Opts.ShortWChar)

lib/Basic/Targets.cpp

@@ -933,6 +933,13 @@ class PPCTargetInfo : public TargetInfo {
     ArchDefineA2q   = 1 << 15
   } ArchDefineTypes;
 
+  // Set the language option for altivec based on our value.
+  void adjust(LangOptions &Opts) override {
+    if (HasAltivec)
+      Opts.AltiVec = 1;
+    TargetInfo::adjust(Opts);
+  }
+
   // Note: GCC recognizes the following additional cpus:
   //  401, 403, 405, 405fp, 440fp, 464, 464fp, 476, 476fp, 505, 740, 801,
   //  821, 823, 8540, 8548, e300c2, e300c3, e500mc64, e6500, 860, cell,

lib/Frontend/CompilerInstance.cpp

@@ -916,12 +916,6 @@ 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>();