linux-kernel - Re: [PATCH 0/4] kbuild: make all file references relative to source root

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Message-ID: <20250315113400.GBZ9VlqIBVsVdzlRAb@fat_crate.local>
Date: Sat, 15 Mar 2025 12:34:00 +0100
From: Borislav Petkov <bp@...en8.de>
To: Thomas Weißschuh <linux@...ssschuh.net>
Cc: Masahiro Yamada <masahiroy@...nel.org>,
	Nathan Chancellor <nathan@...nel.org>,
	Nicolas Schier <nicolas@...sle.eu>,
	Jonathan Corbet <corbet@....net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	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 0/4] kbuild: make all file references relative to source
 root

On Thu, Mar 13, 2025 at 04:59:08PM +0100, Thomas Weißschuh wrote:
> -fmacro-prefix-map only affects __FILE__ and __BASE_FILE__.
> Other references, for example in debug information, is not affected.
> This makes handling of file references in the compiler output harder to
> use and creates problems for reproducible builds.
> 
> Switch to -ffile-prefix map which affects all references.
> 
> Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
> ---
> Thomas Weißschuh (4):
>       kbuild: make all file references relative to source root
>       kbuild: doc: reproducible-builds: drop section "Absolute filenames"
>       x86/boot: Switch to -ffile-prefix-map
>       x86/boot/compressed: Switch to -ffile-prefix-map

Btw, I don't see why those are 4 patches - it is a single logical change that
converts to this new compiler switch.

So why are they 4?

Masahiro, might as well merge them into one...

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette