[clang] Don't fail clang::ExecuteCompilerInvocation() for unrelated errors

Author: jansvoboda11

clang/lib/FrontendTool/ExecuteCompilerInvocation.cpp

@@ -210,6 +210,8 @@ CreateFrontendAction(CompilerInstance &CI) {
 }
 
 bool ExecuteCompilerInvocation(CompilerInstance *Clang) {
+  unsigned NumErrorsBefore = Clang->getDiagnostics().getNumErrors();
+
   // Honor -help.
   if (Clang->getFrontendOpts().ShowHelp) {
     driver::getDriverOptTable().printHelp(
@@ -293,7 +295,7 @@ bool ExecuteCompilerInvocation(CompilerInstance *Clang) {
 #endif
 
   // If there were errors in processing arguments, don't do anything else.
-  if (Clang->getDiagnostics().hasErrorOccurred())
+  if (Clang->getDiagnostics().getNumErrors() != NumErrorsBefore)
     return false;
   // Create and execute the frontend action.
   std::unique_ptr<FrontendAction> Act(CreateFrontendAction(*Clang));