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> Saying musk is non-standard is a serious allegation.

No, it isn't. It's the GP's opinion.

Standard has a few different meanings, including something typically or commonly used. As in "GNU Libc has been the standard C library used by Linux distributions since 1991." That would be, you know, a statement of fact. Musl is, at best, a niche option used by a few distros.

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It's not used by any of the major ones, so in practice lots of apps will be broken. I like musl, and I link it for my own stuff but I only have to make sure my stuff works. if I had to make sure everyone's existing stuff worked glibc is the only practical choice.

Yep. There are lots of edge-cases and macros that glibc provides are difficult to emulate because they require a lot of domain-specific knowledge and special handling. There isn't really a way to use musl in any large distro without lots and lots of patching and giving up correctness and completeness. It's akin to not using ICU4{C,J} and praying that simplistic Unicode handling like normalization will magically work.

Using musl is fine for limited uses, but it's magical thinking to believe that it's at exact feature and functional parity replacement for glibc.

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