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

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Date:   Wed, 07 Sep 2022 09:34:38 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Masahiro Yamada <masahiroy@...nel.org>,
        Miguel Ojeda <ojeda@...nel.org>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        rust-for-linux@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Jarkko Sakkinen <jarkko@...nel.org>,
        Alex Gaynor <alex.gaynor@...il.com>,
        Finn Behrens <me@...enk.de>,
        Adam Bratschi-Kaye <ark.email@...il.com>,
        Wedson Almeida Filho <wedsonaf@...gle.com>,
        Sven Van Asbroeck <thesven73@...il.com>,
        Gary Guo <gary@...yguo.net>,
        Boris-Chengbiao Zhou <bobo1239@....de>,
        Boqun Feng <boqun.feng@...il.com>,
        Douglas Su <d0u9.su@...look.com>,
        Dariusz Sosnowski <dsosnowski@...snowski.pl>,
        Antonio Terceiro <antonio.terceiro@...aro.org>,
        Daniel Xu <dxu@...uu.xyz>, Miguel Cano <macanroj@...il.com>,
        David Gow <davidgow@...gle.com>,
        Tiago Lam <tiagolam@...il.com>,
        Björn Roy Baron <bjorn3_gh@...tonmail.com>,
        Martin Rodriguez Reboredo <yakoyoku@...il.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Richard Weinberger <richard@....at>,
        Anton Ivanov <anton.ivanov@...bridgegreys.com>,
        Johannes Berg <johannes@...solutions.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        X86 ML <x86@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        "open list:SIFIVE DRIVERS" <linux-riscv@...ts.infradead.org>,
        linux-um@...ts.infradead.org
Subject: Re: [PATCH v8 27/31] Kbuild: add Rust support

Masahiro Yamada <masahiroy@...nel.org> writes:
> On Tue, Aug 2, 2022 at 10:53 AM Miguel Ojeda <ojeda@...nel.org> wrote:
>>
>> Having all the new files in place, we now enable Rust support
>> in the build system, including `Kconfig` entries related to Rust,
>> the Rust configuration printer, the target specification
>> generation script, the version detection script and a few
>> other bits.
...
>> +
>> +config RUSTC_VERSION_TEXT
>> +       string
>> +       depends on RUST
>> +       default $(shell,command -v $(RUSTC) >/dev/null 2>&1 && $(RUSTC) --version || echo n)
>> +
>> +config BINDGEN_VERSION_TEXT
>> +       string
>> +       depends on RUST
>> +       default $(shell,command -v $(BINDGEN) >/dev/null 2>&1 && $(BINDGEN) --version || echo n)
>> +
>
> Where are these config options used?
>
> I grep'ed but no hit.
>
> masahiro@zoe:~/ref/linux-next$ git grep RUSTC_VERSION_TEXT
> init/Kconfig:config RUSTC_VERSION_TEXT
> masahiro@zoe:~/ref/linux-next$ git grep BINDGEN_VERSION_TEXT
> init/Kconfig:config BINDGEN_VERSION_TEXT

That came up before in a review by Nick:

Miguel wrote:
> Nick wrote:
> > Are these two kconfigs used anywhere?
> 
> Not for the moment, but it could still be useful when getting
> `.config` reports (and we could add it to `LINUX_COMPILER` etc. in the
> future).

https://lore.kernel.org/all/CANiq72n2bU3LSGu-4v66nif_95EVq--z2X_F2V7JBPU8v=h8EA@mail.gmail.com/


cheers