You can even mix and match it H/SELinux with musl (and Clang, if you’re up for some masochism and performance boost), though it does require patching sometimes. From my experience, you can find patches from Alpine’s Aports and that should fix it ~90% of the time, but sometimes you’d need to write your own. Another tip in case you’re interested in trying musl on Gentoo is that there’s a compilation flag for large file support documented in Gentoo Wiki’s musl development page which fixes compilation failures caused by calls to functions with names ending in 64 (e.g. fseek64). This is yet another massive source of compilation failure in musl. Lastly, you should mask musl versions greater than 1.2.4 if you want to have any semblance of a good time with it.