diff options
Diffstat (limited to 'clang/lib/Lex/Preprocessor.cpp')
| -rw-r--r-- | clang/lib/Lex/Preprocessor.cpp | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/clang/lib/Lex/Preprocessor.cpp b/clang/lib/Lex/Preprocessor.cpp index 69aa7cb51a6..f16d83c5a2e 100644 --- a/clang/lib/Lex/Preprocessor.cpp +++ b/clang/lib/Lex/Preprocessor.cpp @@ -626,7 +626,10 @@ static void InitializePredefinedMacros(Preprocessor &PP, /// EnterMainSourceFile - Enter the specified FileID as the main source file, /// which implicitly adds the builtin defines etc. void Preprocessor::EnterMainSourceFile() { - + // We do not allow the preprocessor to reenter the main file. Doing so will + // cause FileID's to accumulate information from both runs (e.g. #line + // information) and predefined macros aren't guaranteed to be set properly. + assert(NumEnteredSourceFiles == 0 && "Cannot reenter the main file!"); FileID MainFileID = SourceMgr.getMainFileID(); // Enter the main file source buffer. |
