i686-pc-windows-gnu support

[amircodota]

We have a rust binary with openssl that we need to cross compile for windows - both x86_64 and i686.

I was able to create a custom docker image for x86_64-pc-windows-gnu that works well.

I also tried to create a custom image for i686-pc-windows-gnu. There was no base image to customize, so I copied the Dockerfile.x86_64-pc-windows-gnu file to a new one, and changed some stuff around to make it use g++-mingw-w64-i686.

That got me further along - openssl-sys seems to compile correctly.

However, now I get these errors:

/rustc/c367798cfd3817ca6ae908ce675d1d99242af148\/src\libstd/backtrace.rs:229: undefined reference to _Unwind_Resume

This seems to stem from mingw64 for i686 using sjlj for exception handling instead of dwarf-2 which the rust compiler expects (according to this).

Has anyone here had success with this?

In the past, we had success with the japaric/i686-pc-windows-gnu docker image, so maybe @japaric can shed some light on this?

This image no longer works for me. I tried reverting to older versions of cross and older versions of rust, but it still fails.
The weird thing is that this image still works on an old ci machine machine we have, but not on my machine, and I could not figure out why.

Thanks
Amir

[japaric]

so maybe @japaric can shed some light on this?

I'm sorry it's been too long since I looked into that target's Dockerfile.

This seems to stem from mingw64 for i686 using sjlj for exception handling instead of dwarf-2 which the rust compiler expects (according to this).

Different exception handling is the only thing I remember about these mingw targets.

[malbarbo]

I created a fix: #471

[amircodota]

Awesome news @malbarbo Thanks!

[amircodota]

@malbarbo Just tried it and it worked like a charm. Thanks!