linux-kernel - Re: [PATCH v2] kbuild: make all file references relative to source root

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Message-ID: <CAK7LNATcqy9BPUZa_EUUzmGiXX=AWry_Emoj-pG76BLxGmJysw@mail.gmail.com>
Date: Sun, 16 Mar 2025 11:06:06 +0900
From: Masahiro Yamada <masahiroy@...nel.org>
To: Thomas Weißschuh <linux@...ssschuh.net>
Cc: Nathan Chancellor <nathan@...nel.org>, Nicolas Schier <nicolas@...sle.eu>, 
	Jonathan Corbet <corbet@....net>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, 
	Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org, 
	"H. Peter Anvin" <hpa@...or.com>, Ben Hutchings <ben@...adent.org.uk>, linux-kbuild@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org
Subject: Re: [PATCH v2] kbuild: make all file references relative to source root

On Sat, Mar 15, 2025 at 10:20 PM Thomas Weißschuh <linux@...ssschuh.net> wrote:
>
> -fmacro-prefix-map only affects __FILE__ and __BASE_FILE__.
> Other references, for example in debug information, are not affected.
> This makes handling of file references in the compiler outputs harder to
> use and creates problems for reproducible builds.
>
> Switch to -ffile-prefix map which affects all references.
>
> Also drop the documentation section advising manual specification of
> -fdebug-prefix-map for reproducible builds, as it is not necessary
> anymore.
>
> Suggested-by: Ben Hutchings <ben@...adent.org.uk>
> Link: https://lore.kernel.org/lkml/c49cc967294f9a3a4a34f69b6a8727a6d3959ed8.camel@decadent.org.uk/
> Acked-by: Borislav Petkov (AMD) <bp@...en8.de> # arch/x86/
> Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
> ---
> Changes in v2:
> - Pick up Ack from Borislav
> - Merge all changes into single patch
> - Also drop link to KCFLAGS from docs
> - Link to v1: https://lore.kernel.org/r/20250313-kbuild-prefix-map-v1-0-38cea8448c5f@weissschuh.net
> ---

Applied to linux-kbuild. Thanks.


--
Best Regards
Masahiro Yamada