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

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Message-ID: <CAHVXubh4A9JY2hVzYW0ES1QxfLL2iYczXBCcr5OXsrYoZcWJKw@mail.gmail.com>
Date: Thu, 7 Nov 2024 11:09:03 +0100
From: Alexandre Ghiti <alexghiti@...osinc.com>
To: Jean-Philippe Brucker <jean-philippe@...aro.org>
Cc: Björn Töpel <bjorn@...nel.org>, bpf@...r.kernel.org, 
	linux-perf-users@...r.kernel.org, Arnaldo Carvalho de Melo <acme@...hat.com>, 
	Quentin Monnet <qmo@...nel.org>, Björn Töpel <bjorn@...osinc.com>, 
	Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt <palmer@...belt.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

Hi Björn,

On Thu, Nov 7, 2024 at 10:12 AM Jean-Philippe Brucker
<jean-philippe@...aro.org> wrote:
>
> On Wed, Nov 06, 2024 at 08:32:06PM +0100, Björn Töpel wrote:
> > 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>
>
> Reviewed-by: Jean-Philippe Brucker <jean-philippe@...aro.org>
>
> > ---
> >  tools/scripts/Makefile.arch | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/tools/scripts/Makefile.arch b/tools/scripts/Makefile.arch
> > index f6a50f06dfc4..eabfe9f411d9 100644
> > --- a/tools/scripts/Makefile.arch
> > +++ b/tools/scripts/Makefile.arch
> > @@ -7,8 +7,8 @@ HOSTARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
> >                                    -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ \
> >                                    -e s/riscv.*/riscv/ -e s/loongarch.*/loongarch/)
> >
> > -ifndef ARCH
> > -ARCH := $(HOSTARCH)
> > +ifeq ($(strip $(ARCH)),)
> > +override ARCH := $(HOSTARCH)
> >  endif
> >
> >  SRCARCH := $(ARCH)
> >
> > base-commit: 7758b206117dab9894f0bcb8333f8e4731c5065a
> > --
> > 2.45.2
> >

You can add:

Tested-by: Alexandre Ghiti <alexghiti@...osinc.com>

Thanks,

Alex