linux-kernel - Re: [PATCH v2 6/6] kbuild: enable -Werror for hostprogs

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Message-ID: <20251005011100.1035272-1-safinaskar@gmail.com>
Date: Sun,  5 Oct 2025 04:10:47 +0300
From: Askar Safin <safinaskar@...il.com>
To: thomas.weissschuh@...utronix.de
Cc: a.hindborg@...nel.org,
	alex.gaynor@...il.com,
	aliceryhl@...gle.com,
	bjorn3_gh@...tonmail.com,
	boqun.feng@...il.com,
	dakr@...nel.org,
	gary@...yguo.net,
	linux-kbuild@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	lossin@...nel.org,
	nathan@...nel.org,
	nicolas.schier@...ux.dev,
	ojeda@...nel.org,
	rust-for-linux@...r.kernel.org,
	tmgross@...ch.edu
Subject: Re: [PATCH v2 6/6] kbuild: enable -Werror for hostprogs

"Thomas Weißschuh" <thomas.weissschuh@...utronix.de>:
> Enable -Werror unconditionally

Please, drop this patch.

Never enable -Werror unconditionally for any part of build.

I often bisect Linux. And to do this, I often need to build very old
Linux commits (with modern compiler). Unconditional -Werror will make
this impossible.

For example, recently I found this regression:

https://lore.kernel.org/regressions/197f290e30b.eaadc7bc7913.7315623184036672946@zohomail.com/T/#u

The regression caused by commits happened in 2019.

So to bisect it, I had to build 2019 trees using modern compiler.

-- 
Askar Safin