Re: 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 Wed, 2026-05-20 at 10:36 +0200, John Paul Adrian Glaubitz wrote:
> 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.

Some more progress. I managed to cross-compile "Hello World" in Rust for m68k and it
actually runs. The issues which prevented this are two bugs in the LLVM backend, one
is already known upstream [1]. I will file a bug report for the second one.

(unstable-amd64-sbuild)glaubitz@esk:~/rust$ uname -a
Linux esk 6.18.12+deb14-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.18.12-1 (2026-02-17) x86_64 GNU/Linux
(unstable-amd64-sbuild)glaubitz@esk:~/rust$ cat ~/main.rs
fn main() {
    println!("Hello, m68k Linux world!");
}
(unstable-amd64-sbuild)glaubitz@esk:~/rust$ ./build/x86_64-unknown-linux-gnu/stage2/bin/rustc --target m68k-unknown-linux-gnu -C linker=m68k-linux-gnu-gcc ~/main.rs -o ~/hello_world
(unstable-amd64-sbuild)glaubitz@esk:~/rust$ file ~/hello_world 
/home/glaubitz/hello_world: ELF 32-bit MSB pie executable, Motorola m68k, 68020, version 1 (SYSV), dynamically linked, interpreter /lib/ld.so.1, BuildID[sha1]=819625f88d263c358cbf7ff37d660bc453eca931,
for GNU/Linux 3.2.0, not stripped
(unstable-amd64-sbuild)glaubitz@esk:~/rust$ md5sum ~/hello_world 
c12f86b37b301331e14499b573e45955  /home/glaubitz/hello_world
(unstable-amd64-sbuild)glaubitz@esk:~/rust$

glaubitz@mitchy:~$ uname -a
Linux mitchy 6.15.0-rc2-virt #1 Thu May  1 10:27:28 UTC 2025 m68k GNU/Linux
glaubitz@mitchy:~$ file ./hello_world 
./hello_world: ELF 32-bit MSB pie executable, Motorola m68k, 68020, version 1 (SYSV), dynamically linked, interpreter /lib/ld.so.1, BuildID[sha1]=819625f88d263c358cbf7ff37d660bc453eca931, for
GNU/Linux 3.2.0, not stripped
glaubitz@mitchy:~$ md5sum ./hello_world 
c12f86b37b301331e14499b573e45955  ./hello_world
glaubitz@mitchy:~$ ./hello_world 
Hello, m68k Linux world!
glaubitz@mitchy:~$

Adrian

> [1] https://github.com/llvm/llvm-project/issues/152816

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