[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, 1 insertions, 1 deletions

diff --git a/clang/lib/Serialization/ASTWriter.cpp b/clang/lib/Serialization/ASTWriter.cpp
index b7d6d9cecff..28f78c61810 100644
--- a/clang/lib/Serialization/ASTWriter.cpp
+++ b/clang/lib/Serialization/ASTWriter.cpp
@@ -3423,8 +3423,8 @@ void ASTWriter::WriteASTCore(Sema &SemaRef, MemorizeStatCalls *StatCalls,
   // Write the remaining AST contents.
   RecordData Record;
   Stream.EnterSubblock(AST_BLOCK_ID, 5);
-  WriteMetadata(Context, isysroot, OutputFile);
   WriteLanguageOptions(Context.getLangOpts());
+  WriteMetadata(Context, isysroot, OutputFile);
   if (StatCalls && isysroot.empty())
     WriteStatCache(*StatCalls);