[FFmpeg-devel] [PR] avutil: attributes: fix AV_HAS_STD_ATTRIBUTE checks (PR #21802)

[Marvin Scholz via ffmpeg-devel <ffmpeg-devel@ffmpeg.org>]

PR #21802 opened by Marvin Scholz (ePirat)
URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21802
Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21802.patch

Attributes with the language-supported [[attr]] style are only supported
since C++11 and C23 respectively, so this needs to be accounted for in
these checks.

This solves a huge amount of warning spam of:
  warning: [[]] attributes are a C23 extension [-Wc23-extensions]
when using --enable-extra-warnings.


>From e1dcec3e788bec456ab69d211805b6dc8530f301 Mon Sep 17 00:00:00 2001
From: Marvin Scholz <epirat07@gmail.com>
Date: Thu, 19 Feb 2026 19:39:52 +0100
Subject: [PATCH] avutil: attributes: fix AV_HAS_STD_ATTRIBUTE checks

Attributes with the language-supported [[attr]] style are only supported
since C++11 and C23 respectively, so this needs to be accounted for in
these checks.

This solves a huge amount of warning spam of:
  warning: [[]] attributes are a C23 extension [-Wc23-extensions]
when using --enable-extra-warnings.
---
 libavutil/attributes.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libavutil/attributes.h b/libavutil/attributes.h
index 9e0222a691..0781a3dcab 100644
--- a/libavutil/attributes.h
+++ b/libavutil/attributes.h
@@ -46,9 +46,9 @@
 #    define AV_HAS_ATTRIBUTE(x) 0
 #endif
 
-#if defined(__cplusplus) && defined(__has_cpp_attribute)
+#if defined(__cplusplus) && defined(__has_cpp_attribute) && __cplusplus >= 201103L
 #    define AV_HAS_STD_ATTRIBUTE(x) __has_cpp_attribute(x)
-#elif !defined(__cplusplus) && defined(__has_c_attribute)
+#elif !defined(__cplusplus) && defined(__has_c_attribute) && __STDC_VERSION__ >= 202311L
 #    define AV_HAS_STD_ATTRIBUTE(x) __has_c_attribute(x)
 #else
 #    define AV_HAS_STD_ATTRIBUTE(x) 0
-- 
2.52.0

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