1 // RUN: %clang_cc1 -fsyntax-only -verify -std=c11 -Dalignof=__alignof %s 2 // RUN: %clang_cc1 -fsyntax-only -verify -std=c11 -Dalignof=_Alignof -DUSING_C11_SYNTAX %s 3 4 _Alignas(3) int align_illegal; //expected-error {{requested alignment is not a power of 2}} 5 _Alignas(int) char align_big; 6 _Alignas(1) int align_small; // expected-error {{requested alignment is less than minimum}} 7 _Alignas(1) unsigned _Alignas(8) int _Alignas(1) align_multiple; 8 9 struct align_member { 10 _Alignas(8) int member; 11 _Alignas(1) char bitfield : 1; // expected-error {{'_Alignas' attribute cannot be applied to a bit-field}} 12 }; 13 14 typedef _Alignas(8) char align_typedef; // expected-error {{'_Alignas' attribute only applies to variables and fields}} 15 16 void f(_Alignas(1) char c) { // expected-error {{'_Alignas' attribute cannot be applied to a function parameter}} 17 _Alignas(1) register char k; // expected-error {{'_Alignas' attribute cannot be applied to a variable with 'register' storage class}} 18 } 19 20 #ifdef USING_C11_SYNTAX 21 // expected-warning@+4{{'_Alignof' applied to an expression is a GNU extension}} 22 // expected-warning@+4{{'_Alignof' applied to an expression is a GNU extension}} 23 // expected-warning@+4{{'_Alignof' applied to an expression is a GNU extension}} 24 #endif 25 _Static_assert(alignof(align_big) == alignof(int), "k's alignment is wrong"); 26 _Static_assert(alignof(align_small) == 1, "j's alignment is wrong"); 27 _Static_assert(alignof(align_multiple) == 8, "l's alignment is wrong"); 28 _Static_assert(alignof(struct align_member) == 8, "quuux's alignment is wrong"); 29 _Static_assert(sizeof(struct align_member) == 8, "quuux's size is wrong"); 30