#include <stdio.h>

main() 
{
  printf("whats-defined.c: hi there!\n");
#if defined(__sgi)
  printf("__sgi defined\n");
#endif
#if defined(__sgi__)
  printf("__sgi__ defined\n");
#endif
#if defined(sgi)
  printf("sgi defined\n");
#endif

#if defined(__alpha)
  printf("__alpha defined\n");
#endif
#if defined(__alpha__)
  printf("__alpha__ defined\n");
#endif
#if defined(alpha)
  printf("alpha defined\n");
#endif
#if defined(__linux__)
  printf("__linux__ defined\n");
#endif
#if defined(__linux)
  printf("__linux defined\n");
#endif
#if defined(linux)
  printf("linux defined\n");
#endif
}