test/Sema/callingconv.c

// RUN: %clang_cc1 %s -fsyntax-only -verify

void __attribute__((fastcall)) foo(float *a) { 
}

void __attribute__((stdcall)) bar(float *a) { 
}

void __attribute__((fastcall(1))) baz(float *a) { // expected-error {{attribute requires 0 argument(s)}}
}

void __attribute__((fastcall)) test0() { // expected-error {{function with no prototype cannot use 'fastcall' calling convention}}
}

void __attribute__((fastcall)) test1(void) {
}

void __attribute__((fastcall)) test2(int a, ...) { // expected-error {{variadic function cannot use 'fastcall' calling convention}}
}

void __attribute__((cdecl)) ctest0() {}

void __attribute__((cdecl(1))) ctest1(float x) {} // expected-error {{attribute requires 0 argument(s)}}

void (__attribute__((fastcall)) *pfoo)(float*) = foo;

void (__attribute__((stdcall)) *pbar)(float*) = bar;

void (__attribute__((cdecl)) *ptest1)(void) = test1; // expected-warning {{incompatible pointer types}}

void (*pctest0)() = ctest0;

void ctest2() {}
void (__attribute__((cdecl)) *pctest2)() = ctest2;