43 lines · c
1// RUN: %clang_cc1 -fsyntax-only -verify -std=c11 -Dalignof=__alignof %s2// RUN: %clang_cc1 -fsyntax-only -verify -std=c11 -Dalignof=_Alignof -DUSING_C11_SYNTAX %s3// RUN: %clang_cc1 -fsyntax-only -verify -std=c23 -DUSING_C11_SYNTAX %s4 5_Alignas(3) int align_illegal; //expected-error {{requested alignment is not a power of 2}}6_Alignas(int) char align_big;7_Alignas(1) int align_small; // expected-error {{requested alignment is less than minimum}}8_Alignas(1) unsigned _Alignas(8) int _Alignas(1) align_multiple;9 10struct align_member {11 _Alignas(8) int member;12 _Alignas(1) char bitfield : 1; // expected-error {{'_Alignas' attribute cannot be applied to a bit-field}}13};14 15typedef _Alignas(8) char align_typedef; // expected-error {{'_Alignas' attribute only applies to variables and fields}}16 17void f(_Alignas(1) char c) { // expected-error {{'_Alignas' attribute cannot be applied to a function parameter}}18 _Alignas(1) register char k; // expected-error {{'_Alignas' attribute cannot be applied to a variable with 'register' storage class}}19}20 21#ifdef USING_C11_SYNTAX22// expected-warning-re@+4{{'{{(_A|a)}}lignof' applied to an expression is a GNU extension}}23// expected-warning-re@+4{{'{{(_A|a)}}lignof' applied to an expression is a GNU extension}}24// expected-warning-re@+4{{'{{(_A|a)}}lignof' applied to an expression is a GNU extension}}25#endif26_Static_assert(alignof(align_big) == alignof(int), "k's alignment is wrong");27_Static_assert(alignof(align_small) == 1, "j's alignment is wrong");28_Static_assert(alignof(align_multiple) == 8, "l's alignment is wrong");29_Static_assert(alignof(struct align_member) == 8, "quuux's alignment is wrong");30_Static_assert(sizeof(struct align_member) == 8, "quuux's size is wrong");31 32struct GH95032_1 {33 _Alignas(16) char bytes[16];34};35_Static_assert(_Alignof(struct GH95032_1) == 16, "");36 37#if __STDC_VERSION__ >= 202311L38struct GH95032_2 {39 alignas(16) char bytes[16];40};41static_assert(alignof(struct GH95032_2) == 16);42#endif43