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

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Message-ID: <CAK7LNATKK4bZCY7izDdEzNcUu60wjH57TK8ESM50QhUG2a4bRw@mail.gmail.com>
Date: Tue, 11 Mar 2025 20:03:45 +0900
From: Masahiro Yamada <masahiroy@...nel.org>
To: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
Cc: Thomas Weißschuh <linux@...ssschuh.net>, 
	Ben Hutchings <ben@...adent.org.uk>, 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, 
	Urgau <urgau@...ericable.fr>
Subject: Re: [PATCH] kbuild, rust: use -fremap-path-prefix to make paths relative

On Mon, Feb 17, 2025 at 10:23 PM Miguel Ojeda
<miguel.ojeda.sandonis@...il.com> wrote:
>
> On Mon, Feb 10, 2025 at 6:11 PM Thomas Weißschuh <linux@...ssschuh.net> wrote:
> >
> > Remap source path prefixes in all output, including compiler
> > diagnostics, debug information, macro expansions, etc.
>
> Hmm... We don't do all the cases in the C side -- the docs ask to use
> `KCFLAGS` when one wants to remove them in the debug info:
>
>     https://docs.kernel.org/kbuild/reproducible-builds.html#absolute-filenames
>
> I am not sure if there is a reason not to cover all cases in C (Cc'ing Ben).


GCC manual mentions the below about the -fdebug-prefix-map=old=new


"It can also be used to change an absolute path to
a relative path by using . for new.
This can give more reproducible builds, which are location
independent, but may require an extra command to tell GDB
where to find the source files."


I guess "the extra command" might be a bit annoying.






-- 
Best Regards
Masahiro Yamada