[modules] If we hit a failure while loading a PCH/module, abort parsing instead of trying to continue in an invalid state.

Also don't let libclang create a PCH with such an error.

Fixes rdar://13953768

llvm-svn: 182629

1 files changed, 14 insertions, 0 deletions

diff --git a/clang/lib/Lex/PPDirectives.cpp b/clang/lib/Lex/PPDirectives.cpp
index ba3291aa398..947011d7075 100644
--- a/clang/lib/Lex/PPDirectives.cpp
+++ b/clang/lib/Lex/PPDirectives.cpp
@@ -1512,6 +1512,20 @@ void Preprocessor::HandleIncludeDirective(SourceLocation HashLoc,
                                    /*IsIncludeDirective=*/true);
     assert((Imported == 0 || Imported == SuggestedModule) &&
            "the imported module is different than the suggested one");
+
+    if (!Imported && hadModuleLoaderFatalFailure()) {
+      // With a fatal failure in the module loader, we abort parsing.
+      Token &Result = IncludeTok;
+      if (CurLexer) {
+        Result.startToken();
+        CurLexer->FormTokenWithChars(Result, CurLexer->BufferEnd, tok::eof);
+        CurLexer->cutOffLexing();
+      } else {
+        assert(CurPTHLexer && "#include but no current lexer set!");
+        CurPTHLexer->getEOF(Result);
+      }
+      return;
+    }
     
     // If this header isn't part of the module we're building, we're done.
     if (!BuildingImportedModule && Imported) {