linux-kernel - Re: [PATCH] kbuild: rust: add `CONFIG_RUSTC_LLVM

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Message-ID: <CANiq72ne6F1HpoA5gLYu9K0CcNB13JUFK5QgF_Cf4tAyvOm4qQ@mail.gmail.com>
Date: Fri, 11 Oct 2024 13:53:47 +0200
From: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To: Gary Guo <gary@...yguo.net>
Cc: masahiroy@...nel.org, Miguel Ojeda <ojeda@...nel.org>, 
	Alex Gaynor <alex.gaynor@...il.com>, Boqun Feng <boqun.feng@...il.com>, 
	Björn Roy Baron <bjorn3_gh@...tonmail.com>, 
	Benno Lossin <benno.lossin@...ton.me>, Andreas Hindborg <a.hindborg@...nel.org>, 
	Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>, 
	Nathan Chancellor <nathan@...nel.org>, Nick Desaulniers <ndesaulniers@...gle.com>, 
	Bill Wendling <morbo@...gle.com>, Justin Stitt <justinstitt@...gle.com>, 
	Andrew Morton <akpm@...ux-foundation.org>, Petr Mladek <pmladek@...e.com>, Tejun Heo <tj@...nel.org>, 
	Yoann Congal <yoann.congal@...le.fr>, Randy Dunlap <rdunlap@...radead.org>, 
	Roman Gushchin <roman.gushchin@...ux.dev>, Jens Axboe <axboe@...nel.dk>, Jann Horn <jannh@...gle.com>, 
	Mark Rutland <mark.rutland@....com>, kees@...nel.org, linux-kbuild@...r.kernel.org, 
	linux-kernel@...r.kernel.org, llvm@...ts.linux.dev, 
	rust-for-linux@...r.kernel.org, samitolvanen@...gle.com
Subject: Re: [PATCH] kbuild: rust: add `CONFIG_RUSTC_LLVM_VERSION`

On Fri, Oct 11, 2024 at 1:41 PM Gary Guo <gary@...yguo.net> wrote:
>
> The invocation of rustc-version is being moved from init/Kconfig to
> scripts/Kconfig.include for consistency with cc-version.

Yeah, I am ambivalent. Dropping them would minimize changes and avoid
introducing something only used once, which would be nice too. Happy
either way.

> +if output=$("$@" --version --verbose 2>/dev/null | grep LLVM); then

Similarly, I wonder if we should use '^LLVM version: ' here or similar
to minimize the chances the "LLVM" string appears elsewhere in the
future (perhaps in a custom string a vendor adds, though I would
expect them to add it lowercase). We are relying on having a $3 when
splitting anyway.

Depending on what Masahiro prefers, I will take this one or the
one-invocation-only one.

Thanks Gary!

Cheers,
Miguel