gcc/testsuite/gcc.dg/c11-align-2.c

   1 /* Test C11 alignment support.  Test valid code using stdalign.h.  */
   2 /* { dg-do run } */
   3 /* { dg-options "-std=c11 -pedantic-errors" } */
   4
   5 #include <stdalign.h>
   6 #include <stddef.h>
   7
   8 extern int strcmp (const char *, const char *);
   9
  10 extern void exit (int);
  11 extern void abort (void);
  12
  13 alignas (alignof (max_align_t)) char c;
  14 extern alignas (max_align_t) char c;
  15 extern char c;
  16
  17 extern alignas (max_align_t) short s;
  18 alignas (max_align_t) short s;
  19
  20 alignas (int) int i;
  21 extern int i;
  22
  23 alignas (max_align_t) long l;
  24
  25 alignas (max_align_t) long long ll;
  26
  27 alignas (max_align_t) float f;
  28
  29 alignas (max_align_t) double d;
  30
  31 alignas (max_align_t) _Complex long double cld;
  32
  33 alignas (0) alignas (int) alignas (char) char ca[10];
  34
  35 alignas ((int) alignof (max_align_t) + 0) int x;
  36
  37 enum e { E = alignof (max_align_t) };
  38 alignas (E) int y;
  39
  40 void
  41 func (void)
  42 {
  43   alignas (max_align_t) long long auto_ll;
  44 }
  45
  46 /* Valid, but useless.  */
  47 alignas (0) struct s; /* { dg-warning "useless" } */
  48
  49 #ifndef alignas
  50 #error "alignas not defined"
  51 #endif
  52
  53 #ifndef alignof
  54 #error "alignof not defined"
  55 #endif
  56
  57 #ifndef __alignas_is_defined
  58 #error "__alignas_is_defined not defined"
  59 #endif
  60
  61 #if __alignas_is_defined != 1
  62 #error "__alignas_is_defined not 1"
  63 #endif
  64
  65 #ifndef __alignof_is_defined
  66 #error "__alignof_is_defined not defined"
  67 #endif
  68
  69 #if __alignof_is_defined != 1
  70 #error "__alignof_is_defined not 1"
  71 #endif
  72
  73 #define str(x) #x
  74 #define xstr(x) str(x)
  75
  76 const char *s1 = xstr(alignas);
  77 const char *s2 = xstr(alignof);
  78 const char *s3 = xstr(__alignas_is_defined);
  79 const char *s4 = xstr(__alignof_is_defined);
  80
  81 int
  82 main (void)
  83 {
  84   if (strcmp (s1, "_Alignas") != 0)
  85     abort ();
  86   if (strcmp (s2, "_Alignof") != 0)
  87     abort ();
  88   if (strcmp (s3, "1") != 0)
  89     abort ();
  90   if (strcmp (s4, "1") != 0)
  91     abort ();
  92 }