[libclang] Improve AST serialization done by ASTUnit::Save().

The ASTUnit needs to initialize an ASTWriter at the beginning of
parsing to fully handle serialization of a translation unit that
imports modules. Do this by introducing an option to enable it, which
corresponds to CXTranslationUnit_ForSerialization on the C API side.

llvm-svn: 165717

1 files changed, 2 insertions, 0 deletions

diff --git a/clang/tools/libclang/CIndex.cpp b/clang/tools/libclang/CIndex.cpp
index 78e4fc318ff..23d0768413e 100644
--- a/clang/tools/libclang/CIndex.cpp
+++ b/clang/tools/libclang/CIndex.cpp
@@ -2556,6 +2556,7 @@ static void clang_parseTranslationUnit_Impl(void *UserData) {
   bool IncludeBriefCommentsInCodeCompletion
     = options & CXTranslationUnit_IncludeBriefCommentsInCodeCompletion;
   bool SkipFunctionBodies = options & CXTranslationUnit_SkipFunctionBodies;
+  bool ForSerialization = options & CXTranslationUnit_ForSerialization;
 
   // Configure the diagnostics.
   DiagnosticOptions DiagOpts;
@@ -2643,6 +2644,7 @@ static void clang_parseTranslationUnit_Impl(void *UserData) {
                                  /*AllowPCHWithCompilerErrors=*/true,
                                  SkipFunctionBodies,
                                  /*UserFilesAreVolatile=*/true,
+                                 ForSerialization,
                                  &ErrUnit));
 
   if (NumErrors != Diags->getClient()->getNumErrors()) {