Subject: Re: [PATCH] tools/perf: fix build when WERROR=1

From: Arnaldo Carvalho de Melo <[email-masked]>
Date: Wed, 8 Aug 2012 13:18:49 -0300

Em Wed, Aug 08, 2012 at 06:05:50PM +0300, Andy Shevchenko escreveu:
> util/symbol.c: In function ‘hex2u64’:
> util/symbol.c:2836:2: error: passing argument 2 of ‘strtoull’ from incompatible pointer type [-Werror]
> In file included from util/symbol.c:3:0:
> /usr/include/stdlib.h:215:31: note: expected ‘char ** restrict’ but argument is of type ‘const char **’
> cc1: all warnings being treated as errors
> make[1]: *** [util/symbol.o] Error 1
> make[1]: Leaving directory `/home/andy/prj/linux-2.6/tools/perf'
> make: *** [perf] Error 2
> 
> Signed-off-by: Andy Shevchenko <[email-masked]>
> ---
>  tools/perf/util/symbol.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
> index ba2a489..26e695c 100644
> --- a/tools/perf/util/symbol.c
> +++ b/tools/perf/util/symbol.c
> @@ -2831,7 +2831,7 @@ int machines__create_kernel_maps(struct rb_root *machines, pid_t pid)
>   */
>  int hex2u64(const char *ptr, u64 *long_val)
>  {
> -	const char *p = ptr;
> +	char *p;
>  
>  	*long_val = strtoull(ptr, &p, 16);

What tree is this against? Here I have:

/*
 * While we find nice hex chars, build a long_val.
 * Return number of chars processed.
 */
int hex2u64(const char *ptr, u64 *long_val)
{
        const char *p = ptr;
        *long_val = 0;

        while (*p) {
                const int hex_val = hex(*p);

                if (hex_val < 0)
                        break;

                *long_val = (*long_val << 4) | hex_val;
                p++;
        }

        return p - ptr;
}

- Arnaldo