0b79735b50
When testing some configurations of compilers and OSes, I noticed that clang(1) 13 on Debian caused a function to be compiled but unused, and the compiler triggered a compile error. To avoid that error, use __attribute__((__unused__)). Let's call our wrapper NXT_MAYBE_UNUSED, since it describes itself more precisely than the GCC attribute name. It's also the name that C2x (likely C23) has given to the standard attribute, which is [[maybe_unused]], so it's also likely to be more readable because of that name being in ISO C.
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