Add an experimental flag -fauto-module-import that automatically turns

#include or #import direcctives of framework headers into module
imports of the corresponding framework module.

llvm-svn: 139860

clang/lib/Frontend/InitPreprocessor.cpp

@@ -710,6 +710,10 @@ void clang::InitializePreprocessor(Preprocessor &PP,
   InitializeFileRemapping(PP.getDiagnostics(), PP.getSourceManager(),
                           PP.getFileManager(), InitOpts);
 
+  // Specify whether the preprocessor should replace #include/#import with
+  // module imports when plausible.
+  PP.setAutoModuleImport(InitOpts.AutoModuleImport);
+
   // Emit line markers for various builtin sections of the file.  We don't do
   // this in asm preprocessor mode, because "# 4" is not a line marker directive
   // in this mode.
@@ -783,7 +787,7 @@ void clang::InitializePreprocessor(Preprocessor &PP,
                           
   // Copy PredefinedBuffer into the Preprocessor.
   PP.setPredefines(Predefines.str());
-
+  
   // Initialize the header search object.
   ApplyHeaderSearchOptions(PP.getHeaderSearchInfo(), HSOpts,
                            PP.getLangOptions(),