Add a new driver mode to dump compiler feature and extension options.

Add the ability to dump compiler option-related information to a JSON file via the -compiler-options-dump option. Specifically, it dumps the features/extensions lists -- however, this output could be extended to other information should it be useful. In order to support features and extensions, I moved them into a .def file so that we could build the various lists we care about from them without a significant increase in maintenance burden.

llvm-svn: 333653

1 files changed, 2 insertions, 0 deletions

diff --git a/clang/lib/FrontendTool/ExecuteCompilerInvocation.cpp b/clang/lib/FrontendTool/ExecuteCompilerInvocation.cpp
index 1bb939a..ac2ee50 100644
--- a/clang/lib/FrontendTool/ExecuteCompilerInvocation.cpp
+++ b/clang/lib/FrontendTool/ExecuteCompilerInvocation.cpp
@@ -45,6 +45,8 @@ CreateFrontendBaseAction(CompilerInstance &CI) {
   case ASTDump:                return llvm::make_unique<ASTDumpAction>();
   case ASTPrint:               return llvm::make_unique<ASTPrintAction>();
   case ASTView:                return llvm::make_unique<ASTViewAction>();
+  case DumpCompilerOptions:
+    return llvm::make_unique<DumpCompilerOptionsAction>();
   case DumpRawTokens:          return llvm::make_unique<DumpRawTokensAction>();
   case DumpTokens:             return llvm::make_unique<DumpTokensAction>();
   case EmitAssembly:           return llvm::make_unique<EmitAssemblyAction>();