linux-kernel - Re: [PATCH v8 27/31] Kbuild: add Rust support

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Date:   Thu, 18 Aug 2022 01:13:42 +0200
From:   Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Miguel Ojeda <ojeda@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sven Van Asbroeck <thesven73@...il.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Miguel Cano <macanroj@...il.com>,
        Paul Mackerras <paulus@...ba.org>, Gary Guo <gary@...yguo.net>,
        Douglas Su <d0u9.su@...look.com>,
        Borislav Petkov <bp@...en8.de>,
        linux-riscv@...ts.infradead.org, Will Deacon <will@...nel.org>,
        Martin Rodriguez Reboredo <yakoyoku@...il.com>,
        Anton Ivanov <anton.ivanov@...bridgegreys.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Masahiro Yamada <masahiroy@...nel.org>, x86@...nel.org,
        Russell King <linux@...linux.org.uk>,
        Ingo Molnar <mingo@...hat.com>,
        Wedson Almeida Filho <wedsonaf@...gle.com>,
        Alex Gaynor <alex.gaynor@...il.com>,
        Antonio Terceiro <antonio.terceiro@...aro.org>,
        Adam Bratschi-Kaye <ark.email@...il.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        rust-for-linux@...r.kernel.org, linux-kbuild@...r.kernel.org,
        Boqun Feng <boqun.feng@...il.com>,
        linux-um@...ts.infradead.org,
        BjÃB 6rn Roy Baron <bjorn3_gh@...tonmail.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Daniel Xu <dxu@...uu.xyz>, David Gow <davidgow@...gle.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Dariusz Sosnowski <dsosnowski@...snowski.pl>,
        linux-arm-kernel@...ts.infradead.org,
        Tiago Lam <tiagolam@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        linux-kernel@...r.kernel.org,
        Boris-Chengbiao Zhou <bobo1239@....de>,
        Jarkko Sakkinen <jarkko@...nel.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        Richard Weinberger <richard@....at>,
        Finn Behrens <me@...enk.de>,
        Johannes Berg <johannes@...solutions.net>,
        linuxppc-dev@...ts.ozlabs.org,
        Philip Herron <philip.herron@...ecosm.com>,
        Arthur Cohen <arthur.cohen@...ecosm.com>
Subject: Re: [PATCH v8 27/31] Kbuild: add Rust support

On Wed, Aug 17, 2022 at 5:51 PM Arnd Bergmann <arnd@...db.de> wrote:
>
> Thanks for the explanation. My hope was that building the kernel

Don't mention it!

> would actually be easier here than building the more complicated
> rust user space.

Yeah, the kernel is complicated for them in different ways, so I
assume they will decide which bits to tackle first... Hopefully I will
succeed in my attempts to convince them to focus a bit on the kernel
at least ;)

> I tried one more step and just removed the unsupported command
> line flags to see what would happen, but that did not get me any
> further:

Thanks!

It looks like it failed when compiling the target spec generator,
which is a Rust host program. If they were to attempt the GCC Rust
support early on, we could make things easier for them by not
compiling host programs with gccrs.

By the way, feel free to remove all the `-D` flags ("denying") when
playing with it since they are related to diagnostics (making lints
errors that can still be bypassed if needed), in case the crash is
about handling those.

Cheers,
Miguel