gcc/testsuite/gcc.dg/c11-align-1.c

   1 /* Test C11 alignment support.  Test valid code.  */
   2 /* { dg-do compile } */
   3 /* { dg-options "-std=c11 -pedantic-errors" } */
   4
   5 #include <stddef.h>
   6
   7 _Alignas (_Alignof (max_align_t)) char c;
   8 extern _Alignas (max_align_t) char c;
   9 extern char c;
  10
  11 extern _Alignas (max_align_t) short s;
  12 _Alignas (max_align_t) short s;
  13
  14 _Alignas (int) int i;
  15 extern int i;
  16
  17 _Alignas (max_align_t) long l;
  18
  19 _Alignas (max_align_t) long long ll;
  20
  21 _Alignas (max_align_t) float f;
  22
  23 _Alignas (max_align_t) double d;
  24
  25 _Alignas (max_align_t) _Complex long double cld;
  26
  27 _Alignas (0) _Alignas (int) _Alignas (char) char ca[10];
  28
  29 _Alignas ((int) _Alignof (max_align_t) + 0) int x;
  30
  31 enum e { E = _Alignof (max_align_t) };
  32 _Alignas (E) int y;
  33
  34 void
  35 func (void)
  36 {
  37   _Alignas (max_align_t) long long auto_ll;
  38 }
  39
  40 /* Valid, but useless.  */
  41 _Alignas (0) struct s; /* { dg-warning "useless" } */