Index: ELF/InputFiles.cpp
===================================================================
--- ELF/InputFiles.cpp
+++ ELF/InputFiles.cpp
@@ -86,12 +86,18 @@
   // Use fake address calcuated by adding section file offset and offset in
   // section. See comments for ObjectInfo class.
   DILineInfo Info;
-  DILineInfoSpecifier Spec;
-  Tbl->getFileLineInfoForAddress(S->Offset + Offset, nullptr, Spec.FLIKind,
-                                 Info);
+  Tbl->getFileLineInfoForAddress(
+      S->Offset + Offset, nullptr,
+      DILineInfoSpecifier::FileLineInfoKind::AbsoluteFilePath, Info);
   if (Info.Line == 0)
     return "";
-  return Info.FileName + ":" + std::to_string(Info.Line);
+  std::string Ret = Info.FileName + ":" + std::to_string(Info.Line);
+#ifdef LLVM_ON_WIN32
+  // Converts path to use unix path separators so error message is
+  // consistent between platforms.
+  std::replace(Ret.begin(), Ret.end(), '\\', '/');
+#endif
+  return Ret;
 }
 
 // Returns "(internal)", "foo.a(bar.o)" or "baz.o".
Index: test/ELF/Inputs/undef-debug.s
===================================================================
--- test/ELF/Inputs/undef-debug.s
+++ test/ELF/Inputs/undef-debug.s
@@ -1,4 +1,4 @@
-.file 1 "undef-debug.s"
+.file 1 "folder/undef-debug.s"
 .loc 1 3
         .quad zed3
 
Index: test/ELF/undef.s
===================================================================
--- test/ELF/undef.s
+++ test/ELF/undef.s
@@ -9,9 +9,9 @@
 # CHECK: error: undef.s:(.text+0x6): undefined symbol 'bar'
 # CHECK: error: undef.s:(.text+0x10): undefined symbol 'foo(int)'
 # CHECK: error: {{.*}}2.a({{.*}}.o):(.text+0x0): undefined symbol 'zed2'
-# CHECK: error: undef-debug.s:3: undefined symbol 'zed3'
-# CHECK: error: undef-debug.s:7: undefined symbol 'zed4'
-# CHECK: error: undef-debug.s:11: undefined symbol 'zed5'
+# CHECK: error: folder/undef-debug.s:3: undefined symbol 'zed3'
+# CHECK: error: folder/undef-debug.s:7: undefined symbol 'zed4'
+# CHECK: error: folder/undef-debug.s:11: undefined symbol 'zed5'
 
 # RUN: not ld.lld %t.o %t2.a -o %t.exe -no-demangle 2>&1 | \
 # RUN:   FileCheck -check-prefix=NO-DEMANGLE %s