Rich, on Wed, 24 May 2023 10:49:06 -0400 you (Rich Felker ) wrote: > One thought: For testing, you should be able to pass > -D__STDC_VERSION__=whatever to override it, no? Probably. That doesn't solve the problem, though, of knowing during transition if a C23 feature (which isn't a macro) is yet supported by a compiler. The clang feature tests are a very good tool for that. I also have something that mimics this with gcc, but you probably don't want that in musl, don't you ?-) Thanks Jₑₙₛ -- :: ICube :::::::::::::::::::::::::::::: deputy director :: :: Université de Strasbourg :::::::::::::::::::::: ICPS :: :: INRIA Nancy Grand Est :::::::::::::::::::::::: Camus :: :: :::::::::::::::::::::::::::::::::::: ☎ +33 368854536 :: :: https://icube-icps.unistra.fr/index.php/Jens_Gustedt ::