CHECK_C_SOURCE_COMPILES("
  int main(int argc, char **argv) 
  {
    extern char *__bss_start;
    return __bss_start ? 1 : 0;
  }"
HAVE_BSS_START)

CHECK_C_SOURCE_COMPILES("
  int main(int argc, char **argv) 
  {
    extern char *__bss_start;
    return __bss_start ? 1 : 0;
  }"
HAVE_BSS_START)

CHECK_C_SOURCE_COMPILES("
  int main(int argc, char **argv) 
  {
    extern char *__bss_start;
    return __bss_start ? 1 : 0;
  }"
HAVE_BSS_START)