[bpf-next] libbpf: add _GNU_SOURCE for reallocarray to ringbuf.c

Message ID 20200601202601.2139477-1-andriin@fb.com
State New
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  • [bpf-next] libbpf: add _GNU_SOURCE for reallocarray to ringbuf.c
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Commit Message

Andrii Nakryiko June 1, 2020, 8:26 p.m.
On systems with recent enough glibc, reallocarray compat won't kick in, so
reallocarray() itself has to come from stdlib.h include. But _GNU_SOURCE is
necessary to enable it. So add it.

Fixes: 4cff2ba58bf1 ("libbpf: Add BPF ring buffer support")
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
 tools/lib/bpf/ringbuf.c | 3 +++
 1 file changed, 3 insertions(+)


diff --git a/tools/lib/bpf/ringbuf.c b/tools/lib/bpf/ringbuf.c
index bc10fa1d43c7..4fc6c6cbb4eb 100644
--- a/tools/lib/bpf/ringbuf.c
+++ b/tools/lib/bpf/ringbuf.c
@@ -4,6 +4,9 @@ 
  * Copyright (C) 2020 Facebook, Inc.
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
 #include <stdlib.h>
 #include <stdio.h>
 #include <errno.h>