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util: add MAYBE_UNUSED for config dependent variables

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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>
This commit is contained in:
Grazvydas Ignotas 2016-04-16 04:00:10 +03:00 • committed by Ian Romanick
parent 787a53988c
commit e4fc06a2f8
1 changed files with 2 additions and 0 deletions
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2
src/util/macros.h
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@ -204,6 +204,8 @@ do { \
#define UNUSED
#endif
#define MAYBE_UNUSED UNUSED
#ifdef HAVE_FUNC_ATTRIBUTE_WARN_UNUSED_RESULT
#define MUST_CHECK __attribute__((warn_unused_result))
#else