[PATCH] Silence -O3 -Wall warning in malloc/hooks.c with GCC 7 [BZ #22052]

[Florian Weimer]

On 09/03/2017 05:48 PM, H.J. Lu wrote:
> +  unsigned char *magic_p = NULL;

I think the current practice is to use <libc-diag.h> to suppress the
warning.

Is the issue that the memory clobber on the inline asm makes GCC not to
see the conditional initialization?

Thanks,
Florian