Add support for FreeBSD AArch64

[ararslan]

This uses FreeBSD 13.2 to match the setup for x86_64. When adding support for FreeBSD AArch64 to Julia, I was using FreeBSD 14.1, so this may turn out to be a different beast altogether. I guess we'll find out.

Trying to remember what all it is I need to do in order to add a new platform... I think there was something I needed to do that made a tag with release assets for all of the platforms. 🤔

[giordano]

Looks good to me, but you'll have to deploy PlatformSupport (and all the compilers), if you want them, and then open the corresponding PR to BinaryBuilderBase 🙂

[ararslan]

Accompanying BinaryBuilderBase PR: JuliaPackaging/BinaryBuilderBase.jl#387

Things to build:

• PlatformSupport
• GCCBootstrap
  • 4
  • 5
  • 6
  • 7-13
• Rust
• (Anything else?)

Current issues:

• It appears gcc 4 doesn't support FreeBSD AArch64 (and vice versa); the FreeBSD port for gcc 4.8 is (/was, as it's been deleted) only installable on x86-64 and i686
• I forget what the problem was with gcc 5 was but that at least had a FreeBSD port for AArch64
• gcc 6 complained about not being able to find gmp, mpfr, and mpc 🤔
• FreeBSD AArch64 is tier 3 for Rust and doesn't have an official precompiled standard library, not sure what to do about that

[giordano]

For GCC, I think it's fine to stick to limited versions, we do the same with aarch64-darwin, but you need to add some logic in BinaryBuilderBase to choose the right version. For Rust, while we have a build for i686 mingw, in practice we can't use it so we always have to skip that platform. I guess we'll have to skip aarch64 freebsd, too

[ararslan]

I wonder if we can use the compiled FreeBSD AArch64 Rust binaries that FreeBSD's package manager would install on that platform...

[ararslan]

Let's stick with the compilers we've got for now. Perhaps someday I'll try to build Rust and/or earlier GCC versions but in the meantime, ¯\_(ツ)_/¯