Re: First successful cargo build - Re: Summary on what's blocking full Rust support on m68k

[Jeffrey Walton <noloader%gmail.com@localhost>]

On Wed, May 20, 2026 at 4:37 AM John Paul Adrian Glaubitz
<glaubitz%physik.fu-berlin.de@localhost> wrote:
>
> On Mon, 2026-05-18 at 15:03 +0200, John Paul Adrian Glaubitz wrote:
> > I have used Google Gemini Code Assist now [1] in order to create a patch to add support for 32-bit
> > relocations to the LLVM M68k backend. This time, the code makes use of the full capabilities of
> > 68020+ CPUs and does not the inefficient four-instruction method to implement 32-bit accesses.
> >
> > I'm hesitant to send this in for review as this was basically written by Gemini under my supervision
> > with a lot of testing of build tests.
>
> I was eventually able to build cargo for m68k-unknown-linux-gnu:
>
> (unstable-amd64-sbuild)glaubitz@esk:~/rust/build$ file ./x86_64-unknown-linux-gnu/stage2-tools/m68k-unknown-linux-gnu/release/cargo
> ./x86_64-unknown-linux-gnu/stage2-tools/m68k-unknown-linux-gnu/release/cargo: ELF 32-bit MSB pie executable, Motorola m68k, 68020, version 1 (SYSV), dynamically linked, interpreter /lib/ld.so.1,
> BuildID[sha1]=7e5bf08930f87b9eaee173cf163b067f620cb841, for GNU/Linux 3.2.0, not stripped
> (unstable-amd64-sbuild)glaubitz@esk:~/rust/build$
>
> The binary runs on m68k but there is no output, unfortunately. Needs more debugging.

Congratulations!

I'm still not convinced Rust can take over the world.  It has too many
poorly supported architectures and platforms, including m68k.  Confer,
<https://doc.rust-lang.org/nightly/rustc/platform-support.html>.

Jeff