Add version number to PTH files.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@63052 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/clang/Lex/PTHManager.h b/include/clang/Lex/PTHManager.h
index 09cd9e9e3c92b1ada05d4001b7fd4a81af510239..31cf78f03635e52af90dd12061d8eae035c7f601 100644 (file)
--- a/include/clang/Lex/PTHManager.h
+++ b/include/clang/Lex/PTHManager.h
@@ -117,7 +117,10 @@ class PTHManager : public IdentifierInfoLookup {
   }
   IdentifierInfo* LazilyCreateIdentifierInfo(unsigned PersistentID);
   
-public:  
+public:
+  // The current PTH version.
+  enum { Version = 0 };
+
   ~PTHManager();
   
   /// get - Return the identifier token info for the specified named identifier.