linux-kernel - Re: [PATCH] kbuild: remove unnecessary export of RUST_LIB

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Message-ID: <CAH5fLghY0TQWX1T2jjxEFQ0kQ9cCVVZ6hHsMFknn8RX8K0X2jA@mail.gmail.com>
Date: Mon, 23 Sep 2024 11:17:20 +0200
From: Alice Ryhl <aliceryhl@...gle.com>
To: Masahiro Yamada <masahiroy@...nel.org>
Cc: linux-kbuild@...r.kernel.org, Miguel Ojeda <ojeda@...nel.org>, 
	Alex Gaynor <alex.gaynor@...il.com>, Wedson Almeida Filho <wedsonaf@...il.com>, 
	rust-for-linux@...r.kernel.org, Finn Behrens <me@...enk.de>, linux-kernel@...r.kernel.org, 
	Andreas Hindborg <a.hindborg@...sung.com>, Benno Lossin <benno.lossin@...ton.me>, 
	Björn Roy Baron <bjorn3_gh@...tonmail.com>, 
	Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, 
	Nathan Chancellor <nathan@...nel.org>, Nicolas Schier <nicolas@...sle.eu>
Subject: Re: [PATCH] kbuild: remove unnecessary export of RUST_LIB_SRC

On Fri, Sep 13, 2024 at 8:06 PM Masahiro Yamada <masahiroy@...nel.org> wrote:
>
> If RUST_LIB_SRC is defined in the top-level Makefile (via an environment
> variable or command line), it is already exported.
>
> The only situation where it is defined but not exported is when the
> top-level Makefile is wrapped by another Makefile (e.g., GNUmakefile).
> I cannot think of any other use cases.
>
> I know some people use this tip to define custom variables. However,
> even in that case, you can export it directly in the wrapper Makefile.
>
> Example GNUmakefile:
>
>     export RUST_LIB_SRC = /path/to/your/sysroot/lib/rustlib/src/rust/library
>     include Makefile
>
> Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>

Reviewed-by: Alice Ryhl <aliceryhl@...gle.com>