[FFmpeg-devel] [PATCH] libavutil/riscv: avoid redefinition of _GNU_SOURCE (PR #20281)

[FFmpeg-devel] [PATCH] libavutil/riscv: avoid redefinition of _GNU_SOURCE (PR #20281)

[kxxt via ffmpeg-devel]

PR #20281 opened by kxxt
URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/20281
Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/20281.patch

Add #ifndef to avoid potential redefinition of _GNU_SOURCE macro.

This is found while building chromium for riscv64, the redefinition of _GNU_SOURCE causes an error as chromium enables warnings-as-errors.

Signed-off-by: Levi Zim <rsworktech@outlook.com>


From 3cf762278dcb6d946eb3f1b9ad64ee5d49e13c09 Mon Sep 17 00:00:00 2001
From: Levi Zim <rsworktech@outlook.com>
Date: Tue, 19 Aug 2025 11:16:45 +0800
Subject: [PATCH] libavutil/riscv: avoid redefinition of _GNU_SOURCE

Add #ifndef to avoid potential redefinition of _GNU_SOURCE macro.

Signed-off-by: Levi Zim <rsworktech@outlook.com>
---
 libavutil/riscv/cpu.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/libavutil/riscv/cpu.c b/libavutil/riscv/cpu.c
index 163e4fc14a..1ad1fc9264 100644
--- a/libavutil/riscv/cpu.c
+++ b/libavutil/riscv/cpu.c
@@ -18,7 +18,9 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
-#define _GNU_SOURCE
+#ifndef _GNU_SOURCE
+# define _GNU_SOURCE
+#endif
 #include "libavutil/cpu.h"
 #include "libavutil/cpu_internal.h"
 #include "libavutil/macros.h"
-- 
2.49.1

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