On Thu, Jul 23, 2015 at 11:14 AM, Jeffrey Walton <noloader@xxxxxxxxx> wrote: >> But perhaps the simplest and least intrusive approach, if you >> can't use static_assert, is to annotate the unused variable with >> attribute unused: >> >> #define COMPILE_ASSERT_INSTANCE(assertion, instance) \ >> static CompileAssert<(assertion)> \ >> ASSERT_JOIN(assert_, instance) __attribute__ ((unused)) >> > > I like the sound of this one. To pull it off, I need to ensure the > gear that claims to be GCC (by faking __GNUC__), and GCC itself, can > handle it. > > When did GCC add '__attribute__ ((unused))'? We still have GCC 3.x > users (IIRC), so we can't break things for them. There is a shinny > side to the penny: we don't have to support GCC 2.95. > It looks like __ attribute__ ((unused)) is available in 2.95: https://gcc.gnu.org/onlinedocs/gcc-2.95.3/gcc_4.html#SEC84. I'll take that as a win since it predates our minimum. Thanks for the suggestion. Jeff
