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Re: Hard Rust requirements from May onward

From	John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Newsgroups	linux.debian.devel
Subject	Re: Hard Rust requirements from May onward
Date	2025-11-02 11:50 +0100
Message-ID	<LMDOO-9SEJ-3@gated-at.bofh.it> (permalink)
References	<LMDOO-9SEJ-5@gated-at.bofh.it> <LM50J-9u2p-13@gated-at.bofh.it> <LMlIe-9Gve-25@gated-at.bofh.it>
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Hi Antoni,

On Sat, 2025-11-01 at 10:51 -0400, Antoni Boucher wrote:
> As the maintainer of rustc_codegen_gcc 
> (https://github.com/rust-lang/rustc_codegen_gcc), I hope the project is 
> going to be ready enough in time to help here. My current priority is to 
> fix what is needed to be able to build Rust compilers for these platforms.

First of all, thanks a lot for your work on this! I have been trying to help
you with this effort on and off a bit and some folks are also working on it,
so I'm sure we will eventually get there.

FWIW, the ultimatum that Julian set doesn't really exist. There is nothing
that stops us from using a non-rustified version of APT for the time being
until we managed to bootstrap rustc using your code generation backend or
by using gccrs.

So, I don't think it's that urgent. But I guess posting messages like this
gets more attention in the news as the articles on X/Twitter, Hackernews,
LWN and Phoronix show which have adopted the phrasing used by Julian without
any reflection.

But I'm not going to engage in this kind of rage bait. I have said what I
think of this kind of discussion style and might remind people of this the
next time a heated discussion is kicked off because of some politically
incorrect phrases buried in an obscure fortunes package are found.

> But it would help me to get this ready faster if some people would help 
> with issues that are outside the scope of rustc_codegen_gcc but are 
> still needed to make this work. For instance, if you look at this issue 
> for m68k (https://github.com/rust-lang/rustc_codegen_gcc/issues/744) and 
> this issue for DEC Alpha 
> (https://github.com/rust-lang/rustc_codegen_gcc/issues/742), I would 
> appreciate help for things like:
> 
>   * linux-raw-sys does not support m68k.
>   * The rustix crate does not support m68k.

I can help get this done. Also for the other architectures.

>   * The bootstrap script fails to compile native GCC for m68k.

Do you have a bug reference for this?

>   * Possibly some alignment fixes for m68k either on the Rust side or on 
> the distro side (which wanted to switch to an alignment of 4 for pointers).

I need to perform some more tests with 32-bit alignment before we can make the
switch in Debian. But it's definitely work-in-progress.

>   * Create an Alpha target file

I assume you're talking about this:

https://github.com/rust-lang/rust/tree/master/compiler/rustc_target/src/spec/targets

How do I actually determine the data layout for non-LLVM architectures?

>   * Add handling of the Alpha ABI to the Rust compiler

I assume you're talking about the calling convention?

https://github.com/rust-lang/rust/tree/master/compiler/rustc_target/src/callconv

I have added both for several targets and I can certainly do that for Alpha, HPPA
and SuperH. I just need to understand how to wire architectures up when they don't
have an LLVM backend.

>   * Add Alpha to the code inserting metadata into object files

Which code part is this? Are you talking about the object crate?

>   * Add Alpha as a recognized architecture to be used in 
> #[cfg(target_arch = "alpha")].
>   * Add Alpha support to libc.

I can do that as well.

> Some of them do not require any compiler experience since they touch 
> non-compiler projects and none of these require GCC development 
> experience. I hope some people join this effort in order to get there 
> faster. As for me, I'll first focus on having a m68k rust compiler.

OK, thanks!

> Thanks for your help.

You're welcome! Thanks a lot for creating rustc_codegen_gcc and continuing to drive
it forward. I hope we will eventually be able to bootstrap rustc on the four remaining
architectures.

Adrian

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer
`. `'   Physicist
  `-    GPG: 62FF 8A75 84E0 2956 9546  0006 7426 3B37 F5B5 F913

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Hard Rust requirements from May onward Julian Andres Klode <jak@debian.org> - 2025-10-31 21:50 +0100
  Re: Hard Rust requirements from May onward John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> - 2025-10-31 22:40 +0100
    Re: Hard Rust requirements from May onward Simon Richter <sjr@debian.org> - 2025-11-01 04:20 +0100
      Re: Hard Rust requirements from May onward Geert Stappers <stappers@stappers.nl> - 2025-11-01 08:40 +0100
        Re: Hard Rust requirements from May onward Bjørn Mork <bjorn@mork.no> - 2025-11-01 13:40 +0100
          Re: Hard Rust requirements from May onward Simon Josefsson <simon@josefsson.org> - 2025-11-01 14:40 +0100
            Re: Hard Rust requirements from May onward Andrey Rakhmatullin <wrar@debian.org> - 2025-11-01 15:40 +0100
              Re: Hard Rust requirements from May onward Simon Josefsson <simon@josefsson.org> - 2025-11-01 20:40 +0100
                Re: Hard Rust requirements from May onward Philipp Kern <pkern@debian.org> - 2025-11-01 21:10 +0100
                Re: Hard Rust requirements from May onward Holger Levsen <holger@layer-acht.org> - 2025-11-02 00:20 +0100
                Re: Hard Rust requirements from May onward Simon Josefsson <simon@josefsson.org> - 2025-11-02 10:30 +0100
                Re: Hard Rust requirements from May onward Simon Josefsson <simon@josefsson.org> - 2025-11-02 10:40 +0100
                Re: Hard Rust requirements from May onward Philipp Kern <pkern@debian.org> - 2025-11-09 21:40 +0100
                Re: Hard Rust requirements from May onward Simon Josefsson <simon@josefsson.org> - 2025-11-09 23:00 +0100
                Re: Hard Rust requirements from May onward Philipp Kern <phil@philkern.de> - 2025-11-09 23:30 +0100
                Re: Hard Rust requirements from May onward Simon Josefsson <simon@josefsson.org> - 2025-11-10 11:40 +0100
                Re: Hard Rust requirements from May onward Andrey Rakhmatullin <wrar@debian.org> - 2025-11-10 12:20 +0100
                Re: Hard Rust requirements from May onward Holger Levsen <holger@layer-acht.org> - 2025-11-10 13:40 +0100
                Re: Hard Rust requirements from May onward Simon Richter <sjr@debian.org> - 2025-11-10 04:10 +0100
                Re: Hard Rust requirements from May onward Simon Josefsson <simon@josefsson.org> - 2025-11-10 12:00 +0100
                Re: Hard Rust requirements from May onward Simon Richter <sjr@debian.org> - 2025-11-10 15:00 +0100
                Re: Hard Rust requirements from May onward David Kalnischkies <david@kalnischkies.de> - 2025-11-10 17:50 +0100
                Re: Hard Rust requirements from May onward Simon Josefsson <simon@josefsson.org> - 2025-11-10 20:20 +0100
                Re: Hard Rust requirements from May onward Simon Josefsson <simon@josefsson.org> - 2025-11-10 20:30 +0100
                Re: purpose of InRelease in apt [was: non-GPG signatures; was: Rust  requirements] Simon McVittie <smcv@debian.org> - 2025-11-10 17:10 +0100
                Re: purpose of InRelease in apt [was: non-GPG signatures; was: Rust  requirements] Stefano Rivera <stefanor@debian.org> - 2025-11-13 13:20 +0100
                Re: purpose of InRelease in apt [was: non-GPG signatures; was: Rust  requirements] Simon Josefsson <simon@josefsson.org> - 2025-11-13 18:20 +0100
          Re: Hard Rust requirements from May onward Russ Allbery <rra@debian.org> - 2025-11-01 17:50 +0100
          Re: Hard Rust requirements from May onward Christoph Biedl <debian.axhn@manchmal.in-ulm.de> - 2025-11-05 09:10 +0100
        Re: Re: Hard Rust requirements from May onward John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> - 2025-11-02 11:20 +0100
    Re: Hard Rust requirements from May onward Antoni Boucher <bouanto@zoho.com> - 2025-11-01 16:30 +0100
      Re: Hard Rust requirements from May onward John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> - 2025-11-02 11:50 +0100
        Re: Hard Rust requirements from May onward Antoni Boucher <bouanto@zoho.com> - 2025-11-02 16:30 +0100
  Re: Hard Rust requirements from May onward Julian Andres Klode <jak@debian.org> - 2025-10-31 22:50 +0100
  Re: Hard Rust requirements from May onward Paul Tagliamonte <paultag@debian.org> - 2025-11-01 15:20 +0100
    Re: Hard Rust requirements from May onward Paul Tagliamonte <paultag@debian.org> - 2025-11-01 15:20 +0100
    Re: Re: Hard Rust requirements from May onward John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> - 2025-11-02 11:30 +0100
    Re: Hard Rust requirements from May onward Bill Allombert <ballombe@debian.org> - 2025-11-02 15:40 +0100
  Re: Hard Rust requirements from May onward Joerg Jaspert <joerg@debian.org> - 2025-11-02 13:10 +0100
    Re: Hard Rust requirements from May onward Richard Lewis <richard.lewis.debian@googlemail.com> - 2025-11-02 16:20 +0100
      Re: Hard Rust requirements from May onward Adrian Bunk <bunk@debian.org> - 2025-11-02 18:10 +0100
    Re: Hard Rust requirements from May onward Julian Andres Klode <jak@debian.org> - 2025-11-02 17:30 +0100
      Re: Hard Rust requirements from May onward Joerg Jaspert <joerg@debian.org> - 2025-11-02 17:40 +0100
    Re: Hard Rust requirements from May onward Adrian Bunk <bunk@debian.org> - 2025-11-03 23:20 +0100
      Re: Hard Rust requirements from May onward Ansgar 🙀 <ansgar@debian.org> - 2025-11-04 07:30 +0100
        Re: Hard Rust requirements from May onward Mike Hommey <mh@glandium.org> - 2025-11-04 08:10 +0100
        Re: Hard Rust requirements from May onward Adrian Bunk <bunk@debian.org> - 2025-11-04 11:50 +0100
          Re: Hard Rust requirements from May onward Simon Richter <sjr@debian.org> - 2025-11-04 12:10 +0100
            Re: Hard Rust requirements from May onward Adrian Bunk <bunk@debian.org> - 2025-11-04 13:30 +0100
              Vendoring Simon Richter <sjr@debian.org> - 2025-11-04 13:50 +0100
          Re: Hard Rust requirements from May onward Holger Levsen <holger@layer-acht.org> - 2025-11-04 13:20 +0100
            Re: Hard Rust requirements from May onward Simon Richter <sjr@debian.org> - 2025-11-04 13:30 +0100
            Re: Hard Rust requirements from May onward Adrian Bunk <bunk@debian.org> - 2025-11-04 16:00 +0100
              Re: Hard Rust requirements from May onward Holger Levsen <holger@layer-acht.org> - 2025-11-04 16:50 +0100
                Re: Hard Rust requirements from May onward Adrian Bunk <bunk@debian.org> - 2025-11-04 19:40 +0100
        Re: Hard Rust requirements from May onward Stephan Verbücheln <verbuecheln@posteo.de> - 2025-11-04 15:30 +0100
          Re: Hard Rust requirements from May onward Fabian Grünbichler <debian@fabian.gruenbichler.email> - 2025-11-04 18:40 +0100
      Re: Hard Rust requirements from May onward Fabian Grünbichler <debian@fabian.gruenbichler.email> - 2025-11-04 18:30 +0100
        Re: Hard Rust requirements from May onward Sebastian Ramacher <sramacher@debian.org> - 2025-11-04 19:10 +0100
          Re: Hard Rust requirements from May onward Fabian Grünbichler <debian@fabian.gruenbichler.email> - 2025-11-04 19:40 +0100
        Re: Hard Rust requirements from May onward Adrian Bunk <bunk@debian.org> - 2025-11-04 20:10 +0100
          Re: Hard Rust requirements from May onward Adrian Bunk <bunk@debian.org> - 2025-11-04 21:50 +0100
          Re: Hard Rust requirements from May onward Fabian Grünbichler <debian@fabian.gruenbichler.email> - 2025-11-05 07:50 +0100
            Re: Hard Rust requirements from May onward Adrian Bunk <bunk@debian.org> - 2025-11-05 12:10 +0100
        Re: Hard Rust requirements from May onward Adrian Bunk <bunk@debian.org> - 2025-11-05 18:40 +0100
        Re: Hard Rust requirements from May onward Philipp Kern <pkern@debian.org> - 2025-11-06 22:10 +0100
    Re: Hard Rust requirements from May onward Sean Whitton <spwhitton@spwhitton.name> - 2025-11-05 16:00 +0100
  Re: Hard Rust requirements from May onward David Kalnischkies <david@kalnischkies.de> - 2025-11-03 13:40 +0100
    apt-ftparchive alternatives (was: Hard Rust requirements from May  onward) Jeremy Stanley <fungi@yuggoth.org> - 2025-11-03 19:00 +0100
      Re: apt-ftparchive alternatives (was: Hard Rust requirements from  May onward) nick black <dankamongmen@gmail.com> - 2025-11-03 19:50 +0100
        Re: apt-ftparchive alternatives (was: Hard Rust requirements from  May onward) Jeremy Stanley <fungi@yuggoth.org> - 2025-11-03 20:00 +0100
          Re: apt-ftparchive alternatives (was: Hard Rust requirements from  May onward) Peter Pentchev <roam@ringlet.net> - 2025-11-03 21:00 +0100
          Re: apt-ftparchive alternatives Richard Lewis <richard.lewis.debian@googlemail.com> - 2025-11-15 14:00 +0100
      Re: apt-ftparchive alternatives (was: Hard Rust requirements from  May onward) David Kalnischkies <david@kalnischkies.de> - 2025-11-05 16:10 +0100
        Re: apt-ftparchive alternatives Ahmad Khalifa <ahmad@khalifa.ws> - 2025-11-06 22:20 +0100
          Re: apt-ftparchive alternatives David Kalnischkies <david@kalnischkies.de> - 2025-11-09 17:00 +0100
            Re: apt-ftparchive alternatives Ahmad Khalifa <ahmad@khalifa.ws> - 2025-11-09 21:50 +0100
              Re: apt-ftparchive alternatives David Kalnischkies <david@kalnischkies.de> - 2025-11-10 14:00 +0100

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