netdev - Re: [PATCH bpf-next v2] tools/bpf: make libbpf _GNU

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Date:   Fri, 30 Nov 2018 02:42:23 +0100
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Yonghong Song <yhs@...com>
Cc:     ast@...com, netdev@...r.kernel.org, kernel-team@...com
Subject: Re: [PATCH bpf-next v2] tools/bpf: make libbpf _GNU_SOURCE friendly

On 11/30/2018 12:47 AM, Jakub Kicinski wrote:
> On Thu, 29 Nov 2018 15:31:45 -0800, Yonghong Song wrote:
>> During porting libbpf to bcc, I got some warnings like below:
>>   ...
>>   [  2%] Building C object src/cc/CMakeFiles/bpf-shared.dir/libbpf/src/libbpf.c.o
>>   /home/yhs/work/bcc2/src/cc/libbpf/src/libbpf.c:12:0:
>>   warning: "_GNU_SOURCE" redefined [enabled by default]
>>    #define _GNU_SOURCE
>>   ...
>>   [  3%] Building C object src/cc/CMakeFiles/bpf-shared.dir/libbpf/src/libbpf_errno.c.o
>>   /home/yhs/work/bcc2/src/cc/libbpf/src/libbpf_errno.c: In function ‘libbpf_strerror’:
>>   /home/yhs/work/bcc2/src/cc/libbpf/src/libbpf_errno.c:45:7:
>>   warning: assignment makes integer from pointer without a cast [enabled by default]
>>      ret = strerror_r(err, buf, size);
>>   ...
>>
>> bcc is built with _GNU_SOURCE defined and this caused the above warning.
>> This patch intends to make libpf _GNU_SOURCE friendly by
>>   . define _GNU_SOURCE in libbpf.c unless it is not defined
>>   . undefine _GNU_SOURCE as non-gnu version of strerror_r is expected.
>>
>> Signed-off-by: Yonghong Song <yhs@...com>
> 
> Acked-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
> 
> FWIW :)
> 

Applied, thanks.