[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, 6 insertions, 4 deletions

diff --git a/clang/include/clang-c/Index.h b/clang/include/clang-c/Index.h
index a255d9c9181..9d7fb5c7957 100644
--- a/clang/include/clang-c/Index.h
+++ b/clang/include/clang-c/Index.h
@@ -1035,13 +1035,15 @@ enum CXTranslationUnit_Flags {
    * code-completion operations.
    */
   CXTranslationUnit_CacheCompletionResults = 0x08,
+
   /**
-   * \brief DEPRECATED: Enable precompiled preambles in C++.
+   * \brief Used to indicate that the translation unit will be serialized with
+   * \c clang_saveTranslationUnit.
    *
-   * Note: this is a *temporary* option that is available only while
-   * we are testing C++ precompiled preamble support. It is deprecated.
+   * This option is typically used when parsing a header with the intent of
+   * producing a precompiled header.
    */
-  CXTranslationUnit_CXXPrecompiledPreamble = 0x10,
+  CXTranslationUnit_ForSerialization = 0x10,
 
   /**
    * \brief DEPRECATED: Enabled chained precompiled preambles in C++.