Feature Request: Cosmopolitan

[VarLad]

There's a lot of merits to using cosmopolitan libc and cosmocc as our C compiler (or at least give an option to use it)
This should be relatively straightforward, and should enable StaticCompiler.jl to produce one binary that works on most devices x OSs out there, including BIOS, and even Android, all while having a ~+30% binary size!!
What needs to be done:

1. Test it locally by downloading cosmocc and simply using it as cc, when running the compile_executable function.
2. If 1. works, package cosmocc in BinaryBuilder and make it into an extension maybe?

I'll test out 1. when I find more time. 🙂

[VarLad]

By replacing $cc with /path/to/cosmocc/bin/x86_64-unknown-cosmo-cc in run function call, I was able to create an x86-64 (only) but cross-OS binary.
Looks like more setup is needed to get cross-architecture working, as currently just using /path/to/cosmocc/bin/cosmocc is having issues with linker.

[brenhinkeller]

This would be cool! (see also #84 ) I at point tried to implement this (#91 ) and got most of the way there but held off due to some difficulties which I don't fully remember. cosmocc might be a nice way around that, perhaps especially if we can get that via a jll?