Re: [Autogen-users] 5.16.1 make check failure

[Bruce K. <bru...@gm...>]

On 06/18/12 10:57, Dave Hart wrote:

So curiosity got the better of me.  Here is code from glibc:

> /* Find the first occurrence of C in S.  */
> char *
> strchr (s, c_in)
>      const char *s;
>      int c_in;
> {
>   const unsigned char *char_ptr;
>   const unsigned long int *longword_ptr;
>   unsigned long int longword, magic_bits, charmask;
>   unsigned reg_char c;
>
>   c = (unsigned char) c_in;
>
>   /* Handle the first few characters by reading one character at a time.
>      Do this until CHAR_PTR is aligned on a longword boundary.  */
>   for (char_ptr = (const unsigned char *) s;
>        ((unsigned long int) char_ptr & (sizeof (longword) - 1)) != 0;
>        ++char_ptr)
>     if (*char_ptr == c)
>       return (void *) char_ptr;

Please notice the last line.  The cast is being used to strip the const-ness
from "char_ptr".  This is not really different from stripping it from the argument.