clang/test/Sema/alignas.c

   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");