linux-kernel - Re: [PATCH] kbuild: Reject unexpected values for LLVM=

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Message-ID: <d43c85d0-4d84-44df-a436-09fca7a11b07@aosc.io>
Date: Mon, 12 Jan 2026 14:58:08 +0800
From: WangYuli <wangyuli@...c.io>
To: Thomas Weißschuh <linux@...ssschuh.net>,
 Nathan Chancellor <nathan@...nel.org>, Nicolas Schier <nsc@...nel.org>,
 Nick Desaulniers <nick.desaulniers+lkml@...il.com>,
 Bill Wendling <morbo@...gle.com>, Justin Stitt <justinstitt@...gle.com>
Cc: linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
 llvm@...ts.linux.dev
Subject: Re: [PATCH] kbuild: Reject unexpected values for LLVM=

Hi Thomas Weißschuh,

On 2026/1/12 14:43, Thomas Weißschuh wrote:

> The LLVM argument is documented to accept one of three forms:
> * a literal '1' to use the default 'clang',
> * a toolchain prefix path, ending in a trailing '/',
> * a version suffix.
>
> All other values are silently treated as '1'. If for example
> the user accidentally forgets the trailing '/' of a toolchain prefix,
> kbuild will unexpectedly and silently fall back to the system toolchain.
>
> Instead report an error if the user specified an invalid value for LLVM.
>
"Falling back to the system toolchain" may be an acceptable behavior; I 
think reporting a warning here rather than an error would be more 
appropriate.

Thanks,

--

WangYuli