From de51d671486b6ac9a2ad9ee5fcfdb1a23cc59238 Mon Sep 17 00:00:00 2001
From: Dimitry Andric <dim@FreeBSD.org>
Date: Wed, 19 Jul 2017 07:02:30 +0000
Subject: Vendor import of clang trunk r308421:
 https://llvm.org/svn/llvm-project/cfe/trunk@308421

---
 lib/CodeGen/ObjectFilePCHContainerOperations.cpp | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'lib/CodeGen/ObjectFilePCHContainerOperations.cpp')

diff --git a/lib/CodeGen/ObjectFilePCHContainerOperations.cpp b/lib/CodeGen/ObjectFilePCHContainerOperations.cpp
index 37ecc05aa1ee..d0760b9cc2a6 100644
--- a/lib/CodeGen/ObjectFilePCHContainerOperations.cpp
+++ b/lib/CodeGen/ObjectFilePCHContainerOperations.cpp
@@ -152,6 +152,9 @@ public:
     CodeGenOpts.CodeModel = "default";
     CodeGenOpts.ThreadModel = "single";
     CodeGenOpts.DebugTypeExtRefs = true;
+    // When building a module MainFileName is the name of the modulemap file.
+    CodeGenOpts.MainFileName =
+        LangOpts.CurrentModule.empty() ? MainFileName : LangOpts.CurrentModule;
     CodeGenOpts.setDebugInfo(codegenoptions::FullDebugInfo);
     CodeGenOpts.setDebuggerTuning(CI.getCodeGenOpts().getDebuggerTuning());
   }
-- 
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