linux-kernel - Re: Getting Rust to work

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Message-ID: <20210321205619.GB28813@duo.ucw.cz>
Date:   Sun, 21 Mar 2021 21:56:19 +0100
From:   Pavel Machek <pavel@....cz>
To:     Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
Cc:     Miguel Ojeda <ojeda@...nel.org>,
        Alex Gaynor <alex.gaynor@...il.com>,
        rust-for-linux@...r.kernel.org,
        kernel list <linux-kernel@...r.kernel.org>
Subject: Re: Getting Rust to work

Hi!

> > First try was on x86-32. It took me a whlie to figure out the problem,
> > hence the diff below.
> 
> Thanks a lot for trying it out and for the feedback! :-)

Thanks for your work :-).

> The supported architectures are in
> Documentation/rust/arch-support.rst, so we should link to that.
> 
> x86 32-bit and other architectures should eventually work -- we need
> to put some time into them and setting up a few things. For the moment
> we focused on x86_64 and arm64.

Actually x86-32 would be useful for me. That's my test machine.

> > Then I got failure because libclang (?) was not installed. I installed
> > it. But I guess that should be mentioned in docs as dependency.
> 
> Yeah, this is mentioned on the bindgen section in quick-start.rst, I
> will try to improve make it more clear, perhaps I'll a section for
> libclang itself.

Aha, sorry, it is possible I was not careful enough reading the docs.

> > With CONFIG_RUST unset, kernel builds for me. With CONFIG_RUST=y +
> > RUST_EXAMPLE=y... I get errors:
> 
> Typically it is due to a kernel option that enables some GCC flag that
> libclang does not know about -- I have a hack in place to make it
> work, but requires manual maintenance. Can you please attach your
> kernel config?

Done, in a private message.

> Meanwhile, please try building with Clang or LLVM instead, the GCC
> builds are very, very experimental. I'll make it even more explicit in
> the quick-start.

I tried, but newest in my distribution is clang-7, and kernel needs
clang-10.

Best regards,
								Pavel
-- 
http://www.livejournal.com/~pavelmachek

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