clang/test/Sema/builtin-returnaddress.c

// RUN: %clang_cc1 -fsyntax-only -Wframe-address -verify %s
// RUN: %clang_cc1 -fsyntax-only -Wmost -verify %s
// RUN: %clang_cc1 -x c++ -fsyntax-only -Wframe-address -verify %s

void* a(unsigned x) {
return __builtin_return_address(0);
}

void* b(unsigned x) {
return __builtin_return_address(1); // expected-warning{{calling '__builtin_return_address' with a nonzero argument is unsafe}}
}

void* c(unsigned x) {
return __builtin_frame_address(0);
}

void* d(unsigned x) {
return __builtin_frame_address(1); // expected-warning{{calling '__builtin_frame_address' with a nonzero argument is unsafe}}
}

#ifdef __cplusplus
template<int N> void *RA()
{
  return __builtin_return_address(N); // expected-warning{{calling '__builtin_return_address' with a nonzero argument is unsafe}}
}

void *foo()
{
 return RA<2>(); // expected-note{{in instantiation of function template specialization 'RA<2>' requested here}}
}
#endif