[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, 6 insertions, 0 deletions

diff --git a/clang/lib/Lex/Lexer.cpp b/clang/lib/Lex/Lexer.cpp
index e58581ee06b..e3daf346926 100644
--- a/clang/lib/Lex/Lexer.cpp
+++ b/clang/lib/Lex/Lexer.cpp
@@ -3426,6 +3426,12 @@ HandleDirective:
   FormTokenWithChars(Result, CurPtr, tok::hash);
   PP->HandleDirective(Result);
 
+  if (PP->hadModuleLoaderFatalFailure()) {
+    // With a fatal failure in the module loader, we abort parsing.
+    assert(Result.is(tok::eof) && "Preprocessor did not set tok:eof");
+    return;
+  }
+
   // As an optimization, if the preprocessor didn't switch lexers, tail
   // recurse.
   if (PP->isCurrentLexer(this)) {