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

On Wed, May 20, 2026 at 4:37=E2=80=AFAM John Paul Adrian Glaubitz
<[email protected]> 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 patc=
h 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 imp=
lement 32-bit accesses.
> >
> > I'm hesitant to send this in for review as this was basically written b=
y 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-l=
inux-gnu/stage2-tools/m68k-unknown-linux-gnu/release/cargo
> ./x86_64-unknown-linux-gnu/stage2-tools/m68k-unknown-linux-gnu/release/ca=
rgo: ELF 32-bit MSB pie executable, Motorola m68k, 68020, version 1 (SYSV),=
 dynamically linked, interpreter /lib/ld.so.1,
> BuildID[sha1]=3D7e5bf08930f87b9eaee173cf163b067f620cb841, 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