util: add MAYBE_UNUSED for config dependent variables

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 <[email protected]>
Reviewed-by: Francisco Jerez <[email protected]>
Reviewed-by: Chad Versace <[email protected]>
Reviewed-by: Ian Romanick <[email protected]>
Reviewed-by: Emil Velikov <[email protected]>

0 files changed, 0 insertions, 0 deletions