linux-kernel - Re: [PATCH] tools: Override makefile ARCH variable if defined, but empty

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Message-ID: <87r076nikd.fsf@all.your.base.are.belong.to.us>
Date: Wed, 20 Nov 2024 14:25:22 +0100
From: Björn Töpel <bjorn@...nel.org>
To: bpf@...r.kernel.org, linux-perf-users@...r.kernel.org, Alexandre Ghiti
 <alexghiti@...osinc.com>, Arnaldo Carvalho de Melo <acme@...hat.com>,
 Jean-Philippe Brucker <jean-philippe@...aro.org>, Quentin Monnet
 <qmo@...nel.org>, Palmer Dabbelt <palmer@...belt.com>
Cc: Björn Töpel <bjorn@...osinc.com>, Paul Walmsley
 <paul.walmsley@...ive.com>, Albert Ou <aou@...s.berkeley.edu>,
 linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org, David
 Abdurachmanov <davidlt@...osinc.com>
Subject: Re: [PATCH] tools: Override makefile ARCH variable if defined, but
 empty

Björn Töpel <bjorn@...nel.org> writes:

> From: Björn Töpel <bjorn@...osinc.com>
>
> There are a number of tools (bpftool, selftests), that require a
> "bootstrap" build. Here, a bootstrap build is a build host variant of
> a target. E.g., assume that you're performing a bpftool cross-build on
> x86 to riscv, a bootstrap build would then be an x86 variant of
> bpftool. The typical way to perform the host build variant, is to pass
> "ARCH=" in a sub-make. However, if a variable has been set with a
> command argument, then ordinary assignments in the makefile are
> ignored.
>
> This side-effect results in that ARCH, and variables depending on ARCH
> are not set.
>
> Workaround by overriding ARCH to the host arch, if ARCH is empty.
>
> Fixes: 8859b0da5aac ("tools/bpftool: Fix cross-build")
> Signed-off-by: Björn Töpel <bjorn@...osinc.com>

Arnaldo/Palmer/Quentin:

A bit unsure what tree this patch should go. It's very important for the
RISC-V builds, so maybe via Palmer's RISC-V tree?

Opinions? Just want to make sure it doesn't fall between any chairs!
:-)


Björn