diff --git a/lib/libwebsockets.h b/lib/libwebsockets.h index 7c5a9ef2..763775a7 100644 --- a/lib/libwebsockets.h +++ b/lib/libwebsockets.h @@ -168,8 +168,15 @@ struct sockaddr_in; #endif #if defined(__GNUC__) + +/* warn_unused_result attribute only supported by GCC 3.4 or later */ +#if __GNUC__ >= 4 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4) +#define LWS_WARN_UNUSED_RESULT __attribute__((warn_unused_result)) +#else +#define LWS_WARN_UNUSED_RESULT +#endif + #define LWS_VISIBLE __attribute__((visibility("default"))) -#define LWS_WARN_UNUSED_RESULT __attribute__ ((warn_unused_result)) #define LWS_WARN_DEPRECATED __attribute__ ((deprecated)) #else #define LWS_VISIBLE