49 lines · cpp
1// RUN: %clang_cc1 -fsyntax-only -verify %std_cxx98-14 %s2 3// This is a test for an egregious hack in Clang that works around4// issues with GCC's evolution. libstdc++ 4.2.x uses __is_pod as an5// identifier (to declare a struct template like the one below), while6// GCC 4.3 and newer make __is_pod a keyword. Clang treats __is_pod as7// a keyword *unless* it is introduced following the struct keyword.8 9template<typename T>10struct __is_pod { // expected-warning {{keyword '__is_pod' will be made available as an identifier}}11 __is_pod() {}12};13 14__is_pod<int> ipi;15 16// Ditto for __is_same.17template<typename T>18struct __is_same { // expected-warning {{keyword '__is_same' will be made available as an identifier}}19};20 21__is_same<int> isi;22 23// Another, similar egregious hack for __is_signed, which is a type24// trait in Embarcadero's compiler but is used as an identifier in25// libstdc++.26struct test_is_signed {27 static const bool __is_signed = true; // expected-warning {{keyword '__is_signed' will be made available as an identifier}}28};29 30bool check_signed = test_is_signed::__is_signed;31 32template<bool B> struct must_be_true {};33template<> struct must_be_true<false>;34 35void foo() {36 bool b = __is_pod(int);37 must_be_true<__is_pod(int)> mbt;38}39 40// expected-warning@+1 {{declaration does not declare anything}}41struct // expected-error {{declaration of anonymous struct must be a definition}}42#pragma pack(pop)43 S {44};45 46#if !__has_feature(is_pod)47# error __is_pod should still be available.48#endif49