cmake (3.27.7)

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       1  #ifdef CHECK_VARIABLE_EXISTS
       2  
       3  extern int CHECK_VARIABLE_EXISTS;
       4  
       5  #  ifdef __CLASSIC_C__
       6  int main()
       7  {
       8    int ac;
       9    char* av[];
      10  #  else
      11  int main(int ac, char* av[])
      12  {
      13  #  endif
      14    if (ac > 1000) {
      15      return *av[0];
      16    }
      17    return CHECK_VARIABLE_EXISTS;
      18  }
      19  
      20  #else /* CHECK_VARIABLE_EXISTS */
      21  
      22  #  error "CHECK_VARIABLE_EXISTS has to specify the variable"
      23  
      24  #endif /* CHECK_VARIABLE_EXISTS */