clang/test/Sema/callingconv-ms_abi.c

// RUN: %clang_cc1 -fsyntax-only -verify -triple x86_64-pc-win32 %s

void __attribute__((ms_abi)) foo(void);
void (*pfoo)(void) = foo;

void __attribute__((sysv_abi)) bar(void);
void (*pbar)(void) = bar; // expected-warning{{incompatible function pointer types}}

void (__attribute__((sysv_abi)) *pfoo2)(void) = foo; // expected-warning{{incompatible function pointer types}}