Make the clang module container format selectable from the command line.

- introduces a new cc1 option -fmodule-format=[raw,obj]
  with 'raw' being the default
- supports arbitrary module container formats that libclang is agnostic to
- adds the format to the module hash to avoid collisions
- splits the old PCHContainerOperations into PCHContainerWriter and
  a PCHContainerReader.

Thanks to Richard Smith for reviewing this patch!

llvm-svn: 242499

1 files changed, 3 insertions, 1 deletions

diff --git a/clang/lib/Basic/FileManager.cpp b/clang/lib/Basic/FileManager.cpp
index 1a636aefa63..d4927443aa9 100644
--- a/clang/lib/Basic/FileManager.cpp
+++ b/clang/lib/Basic/FileManager.cpp
@@ -587,4 +587,6 @@ void FileManager::PrintStats() const {
   //llvm::errs() << PagesMapped << BytesOfPagesMapped << FSLookups;
 }
 
-PCHContainerOperations::~PCHContainerOperations() {}
+// Virtual destructors for abstract base classes that need live in Basic.
+PCHContainerWriter::~PCHContainerWriter() {}
+PCHContainerReader::~PCHContainerReader() {}