alignas.c revision e702ff302bdb3c53a252b0bcd2deab72fdee274f
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; // FIXME: this should be rejected 7_Alignas(1) unsigned _Alignas(8) int _Alignas(1) align_multiple; 8 9struct 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 14typedef _Alignas(8) char align_typedef; // expected-error {{'_Alignas' attribute only applies to variables, functions and tag types}} 15 16void 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