test/Sema/MicrosoftCompatibility.c

// RUN: %clang_cc1 %s -fsyntax-only -Wno-unused-value -Wmicrosoft -verify -fms-compatibility

enum ENUM1; // expected-warning {{forward references to 'enum' types are a Microsoft extension}}    
enum ENUM1 var1 = 3;
enum ENUM1* var2 = 0;


enum ENUM2 {
  ENUM2_a = (enum ENUM2) 4,
  ENUM2_b = 0x9FFFFFFF, // expected-warning {{enumerator value is not representable in the underlying type 'int'}}
  ENUM2_c = 0x100000000 // expected-warning {{enumerator value is not representable in the underlying type 'int'}}
};