clang/test/Rewriter/objc-modern-boxing.mm: Mark as XFAIL:mingw for now, due to predefined __declspec similar to r155278.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@155417 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Rewriter/objc-modern-boxing.mm b/test/Rewriter/objc-modern-boxing.mm
index 19a6fcc..ed042e0 100644
--- a/test/Rewriter/objc-modern-boxing.mm
+++ b/test/Rewriter/objc-modern-boxing.mm
@@ -3,6 +3,10 @@
 // RUN: %clang_cc1 -x objective-c++ -fblocks -fms-extensions -rewrite-objc %t.mm -o %t-rw.cpp
 // RUN: %clang_cc1 -fsyntax-only -Werror -Wno-address-of-temporary -D"Class=void*" -D"id=void*" -D"SEL=void*" -D"__declspec(X)=" %t-rw.cpp -Wno-attributes
 
+// FIXME: It is incompatible to mingw due to __declspec.
+// See also r155278
+// XFAIL: mingw32
+
 extern char *strdup(const char *str);
 extern "C" void *sel_registerName(const char *);