Re: [PATCH 2/2] nedmalloc: work around overzealous GCC 6 warning

> With GCC 6, the strdup() function is declared with the "nonnull"
> attribute, stating that it is not allowed to pass a NULL value as
> parameter.
>
> In nedmalloc()'s reimplementation of strdup(), Postel's Law is heeded
> and NULL parameters are handled gracefully. GCC 6 complains about that
> now because it thinks that NULL cannot be passed to strdup() anyway.
>
> Let's just shut up GCC >= 6 in that case and go on with our lives.
>
> See https://gcc.gnu.org/gcc-6/porting_to.html for details.
>
> Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
> ---
>  compat/nedmalloc/nedmalloc.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/compat/nedmalloc/nedmalloc.c b/compat/nedmalloc/nedmalloc.c
> index 677d1b2..3f28c0b 100644
> --- a/compat/nedmalloc/nedmalloc.c
> +++ b/compat/nedmalloc/nedmalloc.c
> @@ -956,6 +956,9 @@ void **nedpindependent_comalloc(nedpool *p, size_t elems, size_t *sizes, void **
>  char *strdup(const char *s1)
>  {
>  	char *s2 = 0;
> +#if __GNUC__ >= 6
> +#pragma GCC diagnostic ignored "-Wnonnull-compare"
> +#endif
>  	if (s1) {
>  		size_t len = strlen(s1) + 1;
>  		s2 = malloc(len);