This is a follow-up to f637046d313.

Without the noreturn attribute set, avconv_opt.c fails to build after
d2e6dd32a44 with the error "control may reach end of non-void function".
By making sure the noreturn attribute is set properly, this compiles
as intended.
---
 libavutil/attributes.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavutil/attributes.h b/libavutil/attributes.h
index c770f52..cd4e299 100644
--- a/libavutil/attributes.h
+++ b/libavutil/attributes.h
@@ -117,7 +117,7 @@
 #    define av_printf_format(fmtpos, attrpos)
 #endif
 
-#if AV_GCC_VERSION_AT_LEAST(2,5)
+#if AV_GCC_VERSION_AT_LEAST(2,5) || defined(__clang__)
 #    define av_noreturn __attribute__((noreturn))
 #else
 #    define av_noreturn
-- 
2.7.4

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