1 // RUN: %clang_cc1 -fsyntax-only -verify %s 2 3 // This is a test for an egregious hack in Clang that works around 4 // issues with GCC's evolution. libstdc++ 4.2.x uses __is_pod as an 5 // identifier (to declare a struct template like the one below), while 6 // GCC 4.3 and newer make __is_pod a keyword. Clang treats __is_pod as 7 // a keyword *unless* it is introduced following the struct keyword. 8 9 template<typename T> 10 struct __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. 17 template<typename T> 18 struct __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 type 24 // trait in Embarcadero's compiler but is used as an identifier in 25 // libstdc++. 26 struct test_is_signed { 27 static const bool __is_signed = true; // expected-warning {{keyword '__is_signed' will be made available as an identifier}} 28 }; 29 30 bool check_signed = test_is_signed::__is_signed; 31 32 template<bool B> struct must_be_true {}; 33 template<> struct must_be_true<false>; 34 35 void 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}} 41 struct // 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 #endif 49
