Merge pull request #28142 from nkcsgexi/werror-to-clang-importer

ClangImporter: pass down -warnings-as-errors to clang invocation

Author: nkcsgexi

lib/Frontend/CompilerInvocation.cpp

@@ -600,6 +600,8 @@ static bool ParseClangImporterArgs(ClangImporterOptions &Opts,
     Opts.PCHDisableValidation |= Args.hasArg(OPT_pch_disable_validation);
   }
 
+  if (Args.hasArg(OPT_warnings_as_errors))
+    Opts.ExtraArgs.push_back("-Werror");
   Opts.DebuggerSupport |= Args.hasArg(OPT_debugger_support);
   return false;
 }