Doing a search for "TCC compiler" (to avoid very unrelated stuff) gives a homepage of:

https://www.bellard.org/tcc/

... which says at the top:

    Note: I am no longer working on TCC. Check the mailing list to get up to date information.

So, sounds pretty dead. But actually following the suggestion and taking a look at the mailing list helps:

https://lists.nongnu.org/archive/html/tinycc-devel/2023-03/t...

And the source code repo seems pretty active:

https://repo.or.cz/w/tinycc.git

It can't be used to build against recent versions of musl or static glibc because they require thread-local variables, meaning it pretty much can only be used with dynamic glibc.