avutil: attributes: fix AV_HAS_STD_ATTRIBUTE checks

ePirat · ePirat · commit 9047fa1b084f · 2026-03-16T18:46:24.000+01:00
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. (cherry picked from commit cce545a) Signed-off-by: Marvin Scholz <epirat07@gmail.com>
diff --git a/libavutil/attributes.h b/libavutil/attributes.h
@@ -46,9 +46,14 @@
 #    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) && \
+      defined(__STDC_VERSION__) && \
+      __STDC_VERSION__ >= 202311L
 #    define AV_HAS_STD_ATTRIBUTE(x) __has_c_attribute(x)
 #else
 #    define AV_HAS_STD_ATTRIBUTE(x) 0
