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Yonghong Song 043a7151d2 tools/bpf: make libbpf _GNU_SOURCE friendly 
[ Upstream commit b42699547f ]

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@fb.com>
Acked-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2019-12-13 08:52:15 +01:00
..
.gitignore tools lib bpf: Change FEATURE-DUMP to FEATURE-DUMP.libbpf 2015-11-05 12:47:51 -03:00
bpf.c bpf: libbpf: retry loading program on EAGAIN 2019-10-01 08:26:08 +02:00
bpf.h libbpf: fix samples/bpf build failure due to undefined UINT32_MAX 2019-05-31 06:46:14 -07:00
btf.c Merge ra.kernel.org:/pub/scm/linux/kernel/git/davem/net 2018-08-11 17:52:00 -07:00
btf.h Merge ra.kernel.org:/pub/scm/linux/kernel/git/davem/net 2018-08-11 17:52:00 -07:00
Build tools lib bpf: Provide wrapper for strerror_r to build in !_GNU_SOURCE systems 2018-09-18 10:16:18 -03:00
libbpf.c tools/bpf: make libbpf _GNU_SOURCE friendly 2019-12-13 08:52:15 +01:00
libbpf.h Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 2018-08-07 11:02:05 -07:00
libbpf_errno.c tools/bpf: make libbpf _GNU_SOURCE friendly 2019-12-13 08:52:15 +01:00
Makefile libbpf: force fixdep compilation at the start of the build 2019-04-05 22:32:57 +02:00
nlattr.c libbpf: add error reporting in XDP 2018-02-02 17:53:48 -08:00
nlattr.h libbpf: add error reporting in XDP 2018-02-02 17:53:48 -08:00
str_error.c tools lib bpf: Provide wrapper for strerror_r to build in !_GNU_SOURCE systems 2018-09-18 10:16:18 -03:00
str_error.h tools lib bpf: Provide wrapper for strerror_r to build in !_GNU_SOURCE systems 2018-09-18 10:16:18 -03:00