linux-kernel - Re: [PATCH 0/2] infer CROSS_COMPILE from ARCH for LLVM=1 LLVM

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Message-ID: <YOaR1ZjToP/kgNsC@infradead.org>
Date:   Thu, 8 Jul 2021 06:49:09 +0100
From:   Christoph Hellwig <hch@...radead.org>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Masahiro Yamada <masahiroy@...nel.org>,
        Miguel Ojeda <ojeda@...nel.org>,
        Fangrui Song <maskray@...gle.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Arnd Bergmann <arnd@...nel.org>, linux-kernel@...r.kernel.org,
        linux-kbuild@...r.kernel.org, clang-built-linux@...glegroups.com,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 0/2] infer CROSS_COMPILE from ARCH for LLVM=1 LLVM_IAS=1

On Wed, Jul 07, 2021 at 03:43:08PM -0700, Nick Desaulniers wrote:
> We get constant feedback that the command line invocation of make is too
> long. CROSS_COMPILE is helpful when a toolchain has a prefix of the
> target triple, or is an absolute path outside of $PATH, but it's mostly
> redundant for a given ARCH.
> 
> Instead, let's infer it from ARCH, and move some flag handling into a
> new file included from the top level Makefile.

Why only for LLVM?  I really hate the mess we currently have with
ARCH and CROSS_COMPILE.  Being able to set both in .config (and maybe
even inferring CROSS_COMPILE where possible) would make my life so
much easier.