This is mostly for variables that are only used in asserts and cause unused-but-set-variable warnings in release builds. Could just use UNUSED directly, but MAYBE_UNUSED should be less confusing and is similar to what the Linux kernel has. And yes __attribute__((unused)) can be used on variables on both GCC 4.2 (oldest supported by mesa) and clang 3.0 (just some random old version, not sure what's the minimum for mesa). Signed-off-by: Grazvydas Ignotas <notasas@gmail.com> Reviewed-by: Francisco Jerez <currojerez@riseup.net> Reviewed-by: Chad Versace <chad.versace@intel.com> Reviewed-by: Ian Romanick <ian.d.romanick@intel.com> Reviewed-by: Emil Velikov <emil.velikov@collabora.com>