1  extern void abort (void);
       2  extern int inside_main;
       3  
       4  __attribute__ ((__noinline__))
       5  int
       6  strcmp (const char *s1, const char *s2)
       7  {
       8  #ifdef __OPTIMIZE__
       9    if (inside_main)
      10      abort ();
      11  #endif
      12  
      13    while (*s1 != 0 && *s1 == *s2)
      14      s1++, s2++;
      15  
      16    if (*s1 == 0 || *s2 == 0)
      17      return (unsigned char) *s1 - (unsigned char) *s2;
      18    return *s1 - *s2;
      19  }