From 8746d127c04f5bbaf6c6e88cef8606ca5a6a54e9 Mon Sep 17 00:00:00 2001
From: Dimitry Andric <dim@FreeBSD.org>
Date: Thu, 13 Jul 2017 19:25:38 +0000
Subject: Vendor import of clang trunk r307894:
 https://llvm.org/svn/llvm-project/cfe/trunk@307894

---
 lib/Frontend/FrontendActions.cpp | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'lib/Frontend/FrontendActions.cpp')

diff --git a/lib/Frontend/FrontendActions.cpp b/lib/Frontend/FrontendActions.cpp
index 0fbcc1c7399e..d42400183a43 100644
--- a/lib/Frontend/FrontendActions.cpp
+++ b/lib/Frontend/FrontendActions.cpp
@@ -163,6 +163,16 @@ GenerateModuleAction::CreateASTConsumer(CompilerInstance &CI,
   return llvm::make_unique<MultiplexConsumer>(std::move(Consumers));
 }
 
+bool GenerateModuleFromModuleMapAction::BeginSourceFileAction(
+    CompilerInstance &CI) {
+  if (!CI.getLangOpts().Modules) {
+    CI.getDiagnostics().Report(diag::err_module_build_requires_fmodules);
+    return false;
+  }
+
+  return GenerateModuleAction::BeginSourceFileAction(CI);
+}
+
 std::unique_ptr<raw_pwrite_stream>
 GenerateModuleFromModuleMapAction::CreateOutputFile(CompilerInstance &CI,
                                                     StringRef InFile) {
-- 
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