Index: cfe/trunk/lib/Format/Format.cpp
===================================================================
--- cfe/trunk/lib/Format/Format.cpp
+++ cfe/trunk/lib/Format/Format.cpp
@@ -1917,7 +1917,11 @@
   // Look for .clang-format/_clang-format file in the file's parent directories.
   SmallString<128> UnsuitableConfigFiles;
   SmallString<128> Path(FileName);
-  llvm::sys::fs::make_absolute(Path);
+  if (std::error_code EC = FS->makeAbsolute(Path)) {
+    llvm::errs() << EC.message() << "\n";
+    return Style;
+  }
+
   for (StringRef Directory = Path; !Directory.empty();
        Directory = llvm::sys::path::parent_path(Directory)) {
 
Index: cfe/trunk/unittests/Format/FormatTest.cpp
===================================================================
--- cfe/trunk/unittests/Format/FormatTest.cpp
+++ cfe/trunk/unittests/Format/FormatTest.cpp
@@ -10936,10 +10936,6 @@
             format("auto a = unique_ptr < Foo < Bar>[10]> ;", Spaces));
 }
 
-// Since this test case uses UNIX-style file path. We disable it for MS
-// compiler.
-#if !defined(_MSC_VER) && !defined(__MINGW32__)
-
 TEST(FormatStyle, GetStyleOfFile) {
   vfs::InMemoryFileSystem FS;
   // Test 1: format file in the same directory.
@@ -10967,8 +10963,6 @@
   ASSERT_EQ(Style3, getGoogleStyle());
 }
 
-#endif // _MSC_VER
-
 TEST_F(ReplacementTest, FormatCodeAfterReplacements) {
   // Column limit is 20.
   std::string Code = "Type *a =\n"