config-print.c

   1 #include <inttypes.h>
   2 #include <stdio.h>
   3
   4 int main(int argc, char *argv[]) {
   5     switch(argc == 2 ? argv[1][0] : 0) {
   6         case 'v':
   7 #ifdef __GNUC__
   8 # if __GNUC__ >= 4
   9             puts("4");
  10 # elif __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 2)
  11             puts("3");
  12 # else
  13             puts("2");
  14 # endif
  15 #else
  16             puts("0");
  17 #endif
  18             break;
  19         case 'm':
  20 #ifdef __GNUC__
  21             printf("%d\n", __GNUC_MINOR__);
  22 #else
  23             puts("-1");
  24 #endif
  25             break;
  26         case 'e':
  27             {
  28                 volatile uint32_t i=0x01234567;
  29                 if ((*((uint8_t*)(&i))) == 0x67)
  30                     puts("yes");
  31             }
  32         break;
  33     }
  34     return 0;
  35 }