cmake (3.27.7)

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       1  #ifdef CHECK_FUNCTION_EXISTS
       2  
       3  #  ifdef __cplusplus
       4  extern "C"
       5  #  endif
       6    char
       7    CHECK_FUNCTION_EXISTS(void);
       8  #  ifdef __CLASSIC_C__
       9  int main()
      10  {
      11    int ac;
      12    char* av[];
      13  #  else
      14  int main(int ac, char* av[])
      15  {
      16  #  endif
      17    CHECK_FUNCTION_EXISTS();
      18    if (ac > 1000) {
      19      return *av[0];
      20    }
      21    return 0;
      22  }
      23  
      24  #else /* CHECK_FUNCTION_EXISTS */
      25  
      26  #  error "CHECK_FUNCTION_EXISTS has to specify the function"
      27  
      28  #endif /* CHECK_FUNCTION_EXISTS */