If we are past tok::eof and in caching lex mode, avoid caching repeated tok::eofs.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@108175 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 5 insertions, 1 deletions

diff --git a/include/clang/Lex/Preprocessor.h b/include/clang/Lex/Preprocessor.h
index f90cb0a687..6c9b9fb96e 100644
--- a/include/clang/Lex/Preprocessor.h
+++ b/include/clang/Lex/Preprocessor.h
@@ -871,7 +871,11 @@ private:
   //===--------------------------------------------------------------------===//
   // Caching stuff.
   void CachingLex(Token &Result);
-  bool InCachingLexMode() const { return CurPPLexer == 0 && CurTokenLexer == 0;}
+  bool InCachingLexMode() const {
+    // If the Lexer pointers are 0 and IncludeMacroStack is empty, it means
+    // that we are past EOF, not that we are in CachingLex mode.
+    return CurPPLexer == 0 && CurTokenLexer == 0 && !IncludeMacroStack.empty();
+  }
   void EnterCachingLexMode();
   void ExitCachingLexMode() {
     if (InCachingLexMode())