linux-kernel - Re: [PATCH v2] kbuild, rust: use -fremap-path-prefix to make paths relative

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Message-ID: <CAK7LNASvSShHcf-gL52cF0PGYOx=nJvvbfeGjPVtpEa+t78Kew@mail.gmail.com>
Date: Tue, 11 Mar 2025 20:04:34 +0900
From: Masahiro Yamada <masahiroy@...nel.org>
To: Thomas Weißschuh <linux@...ssschuh.net>
Cc: Nathan Chancellor <nathan@...nel.org>, Nicolas Schier <nicolas@...sle.eu>, 
	Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>, 
	Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, 
	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>, 
	Danilo Krummrich <dakr@...nel.org>, linux-kbuild@...r.kernel.org, 
	linux-kernel@...r.kernel.org, rust-for-linux@...r.kernel.org
Subject: Re: [PATCH v2] kbuild, rust: use -fremap-path-prefix to make paths relative

On Thu, Feb 20, 2025 at 6:22 AM Thomas Weißschuh <linux@...ssschuh.net> wrote:
>
> Remap source path prefixes in all output, including compiler
> diagnostics, debug information, macro expansions, etc.
> This removes a few absolute paths from the binary and also makes it
> possible to use core::panic::Location properly.
>
> Equivalent to the same configuration done for C sources in
> commit 1d3730f0012f ("kbuild: support -fmacro-prefix-map for external modules")
> and commit a73619a845d5 ("kbuild: use -fmacro-prefix-map to make __FILE__ a relative path").
>
> Link: https://doc.rust-lang.org/rustc/command-line-arguments.html#--remap-path-prefix-remap-source-names-in-output
> Acked-by: Miguel Ojeda <ojeda@...nel.org>
> Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
> ---
> Changes in v2:
> - Drop the usage of $(call rustc-option)
> - Link to v1: https://lore.kernel.org/r/20250210-rust-path-remap-v1-1-021c48188df1@weissschuh.net
> ---

Applied to linux-kbuild.
Thanks.


>  Makefile | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/Makefile b/Makefile
> index 9e0d63d9d94b90672f91929e5e148e5a0c346cb6..9ed2222fafd4fa37a367b87a5c681936368318e7 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -1068,6 +1068,7 @@ endif
>  # change __FILE__ to the relative path to the source directory
>  ifdef building_out_of_srctree
>  KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srcroot)/=)
> +KBUILD_RUSTFLAGS += --remap-path-prefix=$(srcroot)/=
>  endif
>
>  # include additional Makefiles when needed
>
> ---
> base-commit: beeb78d46249cab8b2b8359a2ce8fa5376b5ad2d
> change-id: 20250210-rust-path-remap-e97cec71e61a
>
> Best regards,
> --
> Thomas Weißschuh <linux@...ssschuh.net>
>


-- 
Best Regards
Masahiro Yamada