linux-kernel - Re: [PATCH 00/13] [RFC] Rust support

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Date:   Thu, 29 Apr 2021 12:14:22 +0100
From:   Kajetan Puchalski <mrkajetanp@...il.com>
To:     David Laight <David.Laight@...LAB.COM>
Cc:     "'mceier+kernel@...il.com'" <mceier+kernel@...il.com>,
        "ojeda@...nel.org" <ojeda@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "rust-for-linux@...r.kernel.org" <rust-for-linux@...r.kernel.org>,
        "linux-kbuild@...r.kernel.org" <linux-kbuild@...r.kernel.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 00/13] [RFC] Rust support


David Laight <David.Laight@...LAB.COM> writes:

> From: Mariusz Ceier
>> Sent: 28 April 2021 19:34
> ....
>>
>> I suggest to wait until featureful GPL implementation of rust 
>> language
>> is made (assuming GNU Rust is on the way) before merging any 
>> rust code
>> in the kernel and when that implementation is done make a 
>> requirement
>> that all rust code must be buildable by at least GPL 
>> implementation.
>>
>> Maybe it would also be worthwhile to make the requirement that 
>> the
>> kernel must be buildable with free software (not just open 
>> source
>> software) explicit ?
>
> Or put the version of the compiler that works in the source tree
> with the kernel and then build it as part of the full build.

Building compilers takes several hours, I'm pretty sure usually 
much more
than the kernel itself. Building the compiler as part of the full 
build
would be a gigantic pain for everyone involved. Rustc is even 
worse than
most compilers on that front due to the complexity of its runtime 
checks.

--
Kind regards,
Kajetan