And it supports static linking properly, unlike glibc which requires some stuff to still be dynamically linked. So if you want a static binary you can distribute to any Linux version it is a great choice. Plus even dynamically linked it has a single shared library and does not need loads of support files (locales etc) that glibc does. Very useful.
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Several options are available for trying musl. Compiler toolchains are available from the musl-cross project, and several new musl-based Linux distributions are already available (Sabotage and Snowflake, among others). Some well-established distributions including OpenWRT and Gentoo are in the process of adding musl-based variants, and others (Aboriginal, Alpine, Bedrock, Dragora) are adopting musl as their default libc."