CMake/Modules/CheckTypeSize.c

#ifdef CHECK_TYPE_SIZE_TYPE

#ifdef HAVE_SYS_TYPES_H
#  include <sys/types.h>
#endif /* HAVE_SYS_TYPES_H */

#ifdef HAVE_STDINT_H
#  include <stdint.h>
#endif /* HAVE_STDINT_H */

#ifdef HAVE_STDDEF_H
#  include <stddef.h>
#endif /* HAVE_STDDEF_H */

#ifdef __CLASSIC_C__
int main(){
  int ac;
  char*av[];
#else
int main(int ac, char*av[]){
#endif
  if(ac > 1000){return *av[0];}
  return sizeof(CHECK_TYPE_SIZE_TYPE);
}

#else  /* CHECK_TYPE_SIZE_TYPE */

#  error "CHECK_TYPE_SIZE_TYPE has to specify the type"

#endif /* CHECK_TYPE_SIZE_TYPE */