git.ozlabs.org Git - ccan/blob - ccan/cast/test/compile_fail-cast_signed-sizesame.c

   1 #include <ccan/cast/cast.h>
   2 #include <stdlib.h>
   3
   4 /* Note: this *isn't* sizeof(char) on all platforms. */
   5 struct char_struct {
   6         char c;
   7 };
   8
   9 int main(int argc, char *argv[])
  10 {
  11         unsigned char *uc;
  12 #ifdef FAIL
  13         struct char_struct
  14 #else
  15         char
  16 #endif
  17                 *p = NULL;
  18
  19         uc = cast_signed(unsigned char *, p);
  20
  21         (void) uc; /* Suppress unused-but-set-variable warning. */
  22         return 0;
  23 }
  24
  25 #ifdef FAIL
  26 #if !HAVE_TYPEOF||!HAVE_BUILTIN_CHOOSE_EXPR||!HAVE_BUILTIN_TYPES_COMPATIBLE_P
  27 #error "Unfortunately we don't fail if cast_signed can only use size"
  28 #endif
  29 #endif