Index: lld/trunk/ELF/InputFiles.cpp
===================================================================
--- lld/trunk/ELF/InputFiles.cpp
+++ lld/trunk/ELF/InputFiles.cpp
@@ -86,12 +86,14 @@
   // 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);
+  convertToUnixPathSeparator({(char*)Ret.data(), Ret.size()});
+  return Ret;
 }
 
 // Returns "(internal)", "foo.a(bar.o)" or "baz.o".
Index: lld/trunk/include/lld/Core/Reproduce.h
===================================================================
--- lld/trunk/include/lld/Core/Reproduce.h
+++ lld/trunk/include/lld/Core/Reproduce.h
@@ -11,6 +11,7 @@
 #define LLD_CORE_REPRODUCE_H
 
 #include "lld/Core/LLVM.h"
+#include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/ADT/StringSet.h"
 #include "llvm/Support/Error.h"
@@ -65,6 +66,9 @@
 // Returns the string form of the given argument.
 std::string stringize(llvm::opt::Arg *Arg);
 
+// Converts path to use unix path separators.
+void convertToUnixPathSeparator(llvm::MutableArrayRef<char> Path);
+
 }
 
 #endif
Index: lld/trunk/lib/Core/Reproduce.cpp
===================================================================
--- lld/trunk/lib/Core/Reproduce.cpp
+++ lld/trunk/lib/Core/Reproduce.cpp
@@ -50,14 +50,6 @@
   OS << Data;                            // c_filedata
 }
 
-// Converts path to use unix path separators so the cpio can be extracted on
-// both unix and windows.
-static void convertToUnixPathSeparator(SmallString<128> &Path) {
-#ifdef LLVM_ON_WIN32
-  std::replace(Path.begin(), Path.end(), '\\', '/');
-#endif
-}
-
 void CpioFile::append(StringRef Path, StringRef Data) {
   if (!Seen.insert(Path).second)
     return;
@@ -127,3 +119,9 @@
     return K + V;
   return K + " " + V;
 }
+
+void lld::convertToUnixPathSeparator(MutableArrayRef<char> Path) {
+#ifdef LLVM_ON_WIN32
+  std::replace(Path.begin(), Path.end(), '\\', '/');
+#endif
+}
Index: lld/trunk/test/ELF/Inputs/undef-debug.s
===================================================================
--- lld/trunk/test/ELF/Inputs/undef-debug.s
+++ lld/trunk/test/ELF/Inputs/undef-debug.s
@@ -1,4 +1,4 @@
-.file 1 "undef-debug.s"
+.file 1 "dir/undef-debug.s"
 .loc 1 3
         .quad zed3
 
Index: lld/trunk/test/ELF/undef.s
===================================================================
--- lld/trunk/test/ELF/undef.s
+++ lld/trunk/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: dir/undef-debug.s:3: undefined symbol 'zed3'
+# CHECK: error: dir/undef-debug.s:7: undefined symbol 'zed4'
+# CHECK: error: dir/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