On 7/22/25 10:24 AM, Patrick Steinhardt wrote: > On Fri, Jul 18, 2025 at 05:25:01PM -0400, Eli Schwartz wrote: >> For Gentoo HPPA, Alpha, m68k it will simply mean the removal (or end of >> life and staying forever on 2.50, perhaps) of Git. There is no rust >> compiler there. >> >> Even s390 support for rust is limited to a precompiled version not >> everyone is willing to use. >> >> GCC-rs will probably fix this general issue. > > Hm. It would be nice to assemble a list of common or semi-common > distributions that do not have proper support for Rust for all or at > least some platforms. Should we maybe consider reaching out to other > distros (e.g. Debian, Fedora, BSDs) before we commit to any change that > has an outsized impact on the larger ecosystem? > > I would really love to start adopting Rust, and if it's only going to be > architectures that are extremely niche I'm probably fine with that. But > if there are many small systems that are impacted by such a change we > might have to reconsider. > > Meh :/ To elaborate a bit w.r.t. Gentooo. Gentoo Prefix-on-macOS and Prefix-on-Solaris don't support rust either. I think at least macOS is reasonably popular. Obviously Rust supports macOS, and the Prefix maintainer would like it to work but hasn't been able to -- no idea why. Arguably you can tell these users "install a better OS so you can use git". musl has lots of issues with rust, and is disabled for Gentoo musl editions on arm (not arm64), ppc, i686, m68k, mips. Arguably you can tell these users "musl sucks, why are you using it, use glibc like a sensible person". i486 is entirely disabled due to mandatory sse2. Hopefully those users are rare even compared to i686 users. ;) s390 only works on s390x sparc 64ul works, but 32ul does not. riscv rv64gc works, rv32imac does not. A general trend here is 32-bit issues. For alpha/hppa, no references at all -- not even tier 3 support -- on https://doc.rust-lang.org/beta/rustc/platform-support.html, and Gentoo doesn't support LLVM there either. ;) In general, porting rustc to a new arch means *first* porting LLVM, and then after that, *also* porting rustc, so who's going to try the latter before the former? ;) Hence the interest in GCC-rs, which already has a backend supporting all this for C/C++/Fortran plus interest by users of these arches in a portable rust compiler. If rust is added and doesn't have a fallback C impl, all this becomes a relevant topic for consideration. (I don't have strong opinions on optional rust.) ... See $ git clone https://github.com/gentoo/gentoo && cd gentoo $ git grep --name-only features/wd40 profiles/| grep -v 17.0 (wd40 is the inheritance tree for disabling all features in any package that rely on a rust compiler. See README at https://github.com/gentoo/gentoo/tree/master/profiles/features/wd40 for details) -- Eli Schwartz
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