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

[John Paul Adrian Glaubitz <glaubitz%physik.fu-berlin.de@localhost>]

Hi,

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.

Adrian

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