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Date:   Tue, 15 Nov 2022 05:12:46 +0100
From:   Nicolas Schier <nicolas@fjasle.eu>
To:     Nick Desaulniers <nick.desaulniers@gmail.com>
Cc:     Masahiro Yamada <masahiroy@kernel.org>,
        Jiaxun Yang <jiaxun.yang@flygoat.com>,
        Huacai Chen <chenhuacai@kernel.org>,
        WANG Xuerui <git@xen0n.name>, Guo Ren <guoren@kernel.org>,
        linux-kernel@vger.kernel.org, rust-for-linux@vger.kernel.org,
        asahi@lists.linux.dev, linux-kbuild@vger.kernel.org
Subject: Re: [PATCH] scripts: subarch.include: fix SUBARCH on MacOS hosts
Message-ID: <Y3MRvtwdjIwMHvRo@bergen.fjasle.eu>
References: <20221113233812.36784-1-nick.desaulniers@gmail.com>
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On Sun, 13 Nov 2022 15:38:09 -0800 Nick Desaulniers wrote:
> When building the Linux kernel on an aarch64 MacOS based host, if we don't
> specify a value for ARCH when invoking make, we default to arm and thus
> multi_v7_defconfig rather than the expected arm64 and arm64's defconfig.
>=20
> This is because subarch.include invokes `uname -m` which on MacOS hosts
> evaluates to `arm64` but on Linux hosts evaluates to `aarch64`,
>=20
> This allows us to build ARCH=3Darm64 natively on MacOS (as in ARCH need
> not be specified on an aarch64-based system).
>=20
> Utilize a negative lookahead regular expression to avoid matching arm64.
>=20
> Signed-off-by: Nick Desaulniers <nick.desaulniers@gmail.com>
> ---
> This is only part 1 of
> https://github.com/ClangBuiltLinux/linux/commit/f06333e29addbc3d714adb340=
355f471c1dfe95a
> I'm still working on the rest...
>=20
>  scripts/subarch.include | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>=20
> diff --git a/scripts/subarch.include b/scripts/subarch.include
> index 4bd327d0ae42..aa130286b627 100644
> --- a/scripts/subarch.include
> +++ b/scripts/subarch.include
> @@ -6,7 +6,7 @@
> =20
>  SUBARCH :=3D $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
>  				  -e s/sun4u/sparc64/ \
> -				  -e s/arm.*/arm/ -e s/sa110/arm/ \
> +				  -e s/arm\(?:\(?!64\).*\)/arm/ -e s/sa110/arm/ \

On my Debian's sed, this does not match any more at all, e.g.:

  $ echo armv4 | sed -e 's/arm\(?:\(?!64\).*\)/arm/'
  armv4
=2E

This one works for me, but does not look such advanced:

  $ echo arm64 | sed -e '/^arm64$/!s/arm.*/arm/'
  arm64
  $ echo armv4 | sed -e '/^arm64$/!s/arm.*/arm/'
  arm
=2E

Kind regards,
Nicolas

>  				  -e s/s390x/s390/ \
>  				  -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
>  				  -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ \
> --=20
> 2.37.0 (Apple Git-136)

--=20
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