linux-kernel - Re: [PATCH] rust: build: remap path to avoid absolute path

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Message-ID: <CANiq72mhhSKV=CecnZnqhKrt9tpGdMu1hePJtGDgRiD4JG902A@mail.gmail.com>
Date: Sat, 7 Feb 2026 16:22:25 +0100
From: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To: Gary Guo <gary@...yguo.net>, Nathan Chancellor <nathan@...nel.org>, Nicolas Schier <nsc@...nel.org>
Cc: Miguel Ojeda <ojeda@...nel.org>, Boqun Feng <boqun@...nel.org>, 
	Björn Roy Baron <bjorn3_gh@...tonmail.com>, 
	Benno Lossin <lossin@...nel.org>, Andreas Hindborg <a.hindborg@...nel.org>, 
	Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>, 
	Danilo Krummrich <dakr@...nel.org>, Janne Grunau <j@...nau.net>, Asahi Lina <lina+kernel@...hilina.net>, 
	rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-kbuild@...r.kernel.org
Subject: Re: [PATCH] rust: build: remap path to avoid absolute path

On Sat, Feb 7, 2026 at 3:44 PM Gary Guo <gary@...nel.org> wrote:
>
> So, fix this by remap all absolute paths to srctree to relative path
> instead.

In case it matters to Kbuild, we had a relatively recent revert
related to this flag:

  dbdffaf50ff9 ("kbuild, rust: use -fremap-path-prefix to make paths relative")
  8cf5b3f83614 ("Revert "kbuild, rust: use -fremap-path-prefix to make
paths relative"")

  https://lore.kernel.org/rust-for-linux/20250511-kbuild-revert-file-prefix-map-v1-0-9ba640c8411e@weissschuh.net/

>From what I see in the thread (but I didn't get a confirmation back
then), the issue was some developers relying on invoking the debugger
in a different working directory than the `srctree`.

Thanks Gary!

Cheers,
Miguel