netdev - Re: [PATCH bpf-next] tools/bpf: make libbpf _GNU

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Date:   Thu, 29 Nov 2018 13:00:23 -0800
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     Yonghong Song <yhs@...com>
Cc:     <ast@...com>, <daniel@...earbox.net>, <netdev@...r.kernel.org>,
        <kernel-team@...com>
Subject: Re: [PATCH bpf-next] tools/bpf: make libbpf _GNU_SOURCE friendly

On Thu, 29 Nov 2018 12:38:03 -0800, Yonghong Song wrote:
> diff --git a/tools/lib/bpf/libbpf_errno.c b/tools/lib/bpf/libbpf_errno.c
> index d83b17f8435c..286e497c50ec 100644
> --- a/tools/lib/bpf/libbpf_errno.c
> +++ b/tools/lib/bpf/libbpf_errno.c
> @@ -40,9 +40,19 @@ int libbpf_strerror(int err, char *buf, size_t size)
>  	err = err > 0 ? err : -err;
>  
>  	if (err < __LIBBPF_ERRNO__START) {
> +#ifdef _GNU_SOURCE
> +		const char *ret_buf;
> +#endif
>  		int ret;
>  
> +#ifdef _GNU_SOURCE
> +		ret_buf = strerror_r(err, buf, size);
> +		if (ret_buf != buf)
> +			snprintf(buf, size, "%s", ret_buf);
> +		ret = 0;
> +#else
>  		ret = strerror_r(err, buf, size);
> +#endif
>  		buf[size - 1] = '\0';
>  		return ret;
>  	}

That is kinda strange, the whole point for this file was to have
non-GNU strerror_r, would doing #undef _GNU_SOURCE at the top not work?