figure out how to link clang itself against musl about tc-build HOT 9 OPEN

@nickdesaulniers you might be interested in https://github.com/dzbarsky/static-clang/ (Also, hi, long time no see!)

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This is difficult to be done purely in llvm-project's CMake build system. Some musl linked external libraries are needed: libtinfo, libz, libstdc++/libc++. One will need a musl targeting toolchain to build these external libraries, then build a clang+libc++ (the built clang produces object files linking against the build musl libc++), finally re-build clang with the libc++ using clang.

musl-cross-make can build a GCC toolchain, but the author does not have extra bandwidth to support Clang.
@pattop's https://www.openwall.com/lists/musl/2021/01/11/1 may be helpful.

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we do cross build clang in Yocto/OE world to run on musl targets, I wonder if same clang can be targeted at x86_64 and used

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The current state of my musl-cross-make clang support is here https://github.com/apexrtos/musl-cross-make/tree/clang. It includes some patches for my embedded work, but the native x86_64 toolchain should be fully functional.

make COMPILER=clang
make COMPILER=clang OUTPUT=/tmp/musl-clang install

should be all you need to do to get a working musl-clang toolchain with some arm targets and x86_64. I've never tried to build clang with this though.

@MaskRay if you have time it would be great if you could review my build process & patches. Ideally it would be merged into musl-cross-make upstream but that doesn't look to be possible at the moment. There's enough complexity here that I think it's worth having one recipe for people to use.

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@compnerd has something hacked up that seems to be working:
https://gist.github.com/compnerd/ebbc625a359d1d3e292e1fd2007ecb52

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I'm working through trying to get this working in https://github.com/ClangBuiltLinux/llvm-musl-bootstrap/pull/1/files.

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What @sternenseemann did in #150 (comment) using Musl, so we have static linking and musl link both working.

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yo @dzbarsky I bookmarked that shit yesterday

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Nice, I fixed/cleaned up a few things and tagged a 17.0.1 release. It works for my purposes but if you see something off, let me know

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