From: Yonghong Song yhs@fb.com
[ Upstream commit b42699547fc9fb1057795bccc21a6445743a7fde ]
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 --- tools/lib/bpf/libbpf.c | 2 ++ tools/lib/bpf/libbpf_errno.c | 1 + 2 files changed, 3 insertions(+)
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c index a350f97e3a1a4..a62be78fc07b1 100644 --- a/tools/lib/bpf/libbpf.c +++ b/tools/lib/bpf/libbpf.c @@ -22,7 +22,9 @@ * License along with this program; if not, see http://www.gnu.org/licenses */
+#ifndef _GNU_SOURCE #define _GNU_SOURCE +#endif #include <stdlib.h> #include <stdio.h> #include <stdarg.h> diff --git a/tools/lib/bpf/libbpf_errno.c b/tools/lib/bpf/libbpf_errno.c index d9ba851bd7f9f..d2d17226d9d6b 100644 --- a/tools/lib/bpf/libbpf_errno.c +++ b/tools/lib/bpf/libbpf_errno.c @@ -20,6 +20,7 @@ * License along with this program; if not, see http://www.gnu.org/licenses */
+#undef _GNU_SOURCE #include <stdio.h> #include <string.h>