diff options
Diffstat (limited to 'clang/lib/Lex/PPDirectives.cpp')
| -rw-r--r-- | clang/lib/Lex/PPDirectives.cpp | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/clang/lib/Lex/PPDirectives.cpp b/clang/lib/Lex/PPDirectives.cpp index 5d5cae5fd0f..193388650d2 100644 --- a/clang/lib/Lex/PPDirectives.cpp +++ b/clang/lib/Lex/PPDirectives.cpp @@ -1871,6 +1871,18 @@ Preprocessor::ImportAction Preprocessor::HandleHeaderIncludeOrImport( return {ImportAction::None}; } + // Check for circular inclusion of the main file. + // We can't generate a consistent preamble with regard to the conditional + // stack if the main file is included again as due to the preamble bounds + // some directives (e.g. #endif of a header guard) will never be seen. + // Since this will lead to confusing errors, avoid the inclusion. + if (File && PreambleConditionalStack.isRecording() && + SourceMgr.translateFile(File) == SourceMgr.getMainFileID()) { + Diag(FilenameTok.getLocation(), + diag::err_pp_including_mainfile_in_preamble); + return {ImportAction::None}; + } + // Should we enter the source file? Set to Skip if either the source file is // known to have no effect beyond its effect on module visibility -- that is, // if it's got an include guard that is already defined, set to Import if it |
