gcc/testsuite/gcc.dg/limits-width-2.c

   1 /* Test C23 width macros in <limits.h>.  */
   2 /* { dg-do compile } */
   3 /* { dg-options "-std=c23" } */
   4
   5 #include <limits.h>
   6
   7 #define CHECK_WIDTH(TYPE, MAX, WIDTH)                                   \
   8   _Static_assert ((MAX >> ((TYPE) -1 < 0 ? (WIDTH - 2) : (WIDTH - 1))) == 1, \
   9                   "width must match type")
  10
  11 #ifndef CHAR_WIDTH
  12 # error "missing CHAR_WIDTH"
  13 #endif
  14 CHECK_WIDTH (char, CHAR_MAX, CHAR_WIDTH);
  15 #ifndef SCHAR_WIDTH
  16 # error "missing SCHAR_WIDTH"
  17 #endif
  18 CHECK_WIDTH (signed char, SCHAR_MAX, SCHAR_WIDTH);
  19 #ifndef UCHAR_WIDTH
  20 # error "missing UCHAR_WIDTH"
  21 #endif
  22 CHECK_WIDTH (unsigned char, UCHAR_MAX, UCHAR_WIDTH);
  23 #ifndef SHRT_WIDTH
  24 # error "missing SHRT_WIDTH"
  25 #endif
  26 CHECK_WIDTH (signed short, SHRT_MAX, SHRT_WIDTH);
  27 #ifndef USHRT_WIDTH
  28 # error "missing USHRT_WIDTH"
  29 #endif
  30 CHECK_WIDTH (unsigned short, USHRT_MAX, USHRT_WIDTH);
  31 #ifndef INT_WIDTH
  32 # error "missing INT_WIDTH"
  33 #endif
  34 CHECK_WIDTH (signed int, INT_MAX, INT_WIDTH);
  35 #ifndef UINT_WIDTH
  36 # error "missing UINT_WIDTH"
  37 #endif
  38 CHECK_WIDTH (unsigned int, UINT_MAX, UINT_WIDTH);
  39 #ifndef LONG_WIDTH
  40 # error "missing LONG_WIDTH"
  41 #endif
  42 CHECK_WIDTH (signed long, LONG_MAX, LONG_WIDTH);
  43 #ifndef ULONG_WIDTH
  44 # error "missing ULONG_WIDTH"
  45 #endif
  46 CHECK_WIDTH (unsigned long, ULONG_MAX, ULONG_WIDTH);
  47 #ifndef LLONG_WIDTH
  48 # error "missing LLONG_WIDTH"
  49 #endif
  50 CHECK_WIDTH (signed long long, LLONG_MAX, LLONG_WIDTH);
  51 #ifndef ULLONG_WIDTH
  52 # error "missing ULLONG_WIDTH"
  53 #endif
  54 CHECK_WIDTH (unsigned long long, ULLONG_MAX, ULLONG_WIDTH);