Index: clang/lib/CodeGen/CGDebugInfo.cpp
===================================================================
--- clang/lib/CodeGen/CGDebugInfo.cpp
+++ clang/lib/CodeGen/CGDebugInfo.cpp
@@ -409,6 +409,10 @@
     // If the location is not valid then use main input file.
     return TheCU->getFile();
 
+  if (!llvm::sys::path::is_absolute(FileName)) {
+      FileName = llvm::sys::path::remove_leading_dotslash(FileName);
+    }
+
   // Cache the results.
   auto It = DIFileCache.find(FileName.data());
   if (It != DIFileCache.end()) {