From: Dave Marchevsky <davemarchevsky@fb.com>
Date: Sat, 19 Jun 2021 05:52:46 +0000 (-0700)
Subject: libbpf-tools: Don't redefine _GNU_SOURCE to avoid redefinition warning
X-Git-Tag: v0.21.0~28
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=c60bd48a857a4099dec7dc846ab8cc27e26650a2;p=platform%2Fupstream%2Fbcc.git

libbpf-tools: Don't redefine _GNU_SOURCE to avoid redefinition warning

Similar to past commits like 667988ce9e2a051ff608b727f6c89a5baa01fa67,
my toolchain complains that `_GNU_SOURCE` is redefined. Let's only
define it when it passes `ifndef`
---

diff --git a/libbpf-tools/trace_helpers.c b/libbpf-tools/trace_helpers.c
index 0e9b0192..f37015e7 100644
--- a/libbpf-tools/trace_helpers.c
+++ b/libbpf-tools/trace_helpers.c
@@ -3,7 +3,9 @@
 //
 // Based on ksyms improvements from Andrii Nakryiko, add more helpers.
 // 28-Feb-2020   Wenbo Zhang   Created this.
+#ifndef _GNU_SOURCE
 #define _GNU_SOURCE
+#endif
 #include <ctype.h>
 #include <stdio.h>
 #include <stdlib.h>
diff --git a/libbpf-tools/uprobe_helpers.c b/libbpf-tools/uprobe_helpers.c
index 4a627a91..9f6e3b54 100644
--- a/libbpf-tools/uprobe_helpers.c
+++ b/libbpf-tools/uprobe_helpers.c
@@ -1,6 +1,8 @@
 // SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
 /* Copyright (c) 2021 Google LLC. */
+#ifndef _GNU_SOURCE
 #define _GNU_SOURCE
+#endif
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>