linux-kernel - Re: [PATCH v2 0/7] selftests/nolibc: customize CROSS

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Date:   Sun, 13 Aug 2023 18:05:03 +0800
From:   Zhangjin Wu <falcon@...ylab.org>
To:     w@....eu
Cc:     falcon@...ylab.org, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org, tanyuan@...ylab.org,
        thomas@...ch.de
Subject: Re: [PATCH v2 0/7] selftests/nolibc: customize CROSS_COMPILE for all supported architectures

Hi, Willy

> Hi Zhangjin,
> 
> On Sat, Aug 12, 2023 at 04:27:01AM +0800, Zhangjin Wu wrote:
> > Hi, Willy
> > 
> > Here is v2 of the customized CROSS_COMPILE support, this helps a lot
> > during the testing of the other cross-arch nolibc changes:
> > 
> >     $ ARCHS="i386 x86_64 arm64 arm mips ppc ppc64 ppc64le riscv s390"
> >     $ for arch in ${ARCHS[@]}; do printf "%9s: " $arch; make run-user XARCH=$arch | grep status; done
> > 
> > Based on your suggestion, we did this changes:
> > 
> > - The qemu notes patch [1] is removed, welcome your doc file ;-)
> > - Arnd's crosstools are customized by default
> > - Import cc-cross-prefix to support local cross toolchains too
> > - Use mips64 toolchains for mips like x86_64 toolchains for i386, allow
> >   download less toolchains
> > - Use HOSTCC for libc-test compiling
> (...)
> 
> I think it's basically OK (just this mips64 thing). I've picked patch 3
> already since it's a fix. Once we agree on what to do there, I can queue
> it if that helps (I can modify mips64- to mips- in the patch if that's
> OK for you, no need to resend for this, just let me know).
>

It is ok for me, thanks ;-)

I thought somebody may add mips64 support soon, but we do only have mips
currently, it is fair to not use mips64 toolchain.

> I think that later I'll further extend XARCH with new variants to
> support ARMv5 and Thumb2, because we have different code for this
> and I continue to manually change the CFLAGS to test both.
>

Ok, what about further add x86_64 as the default variant for x86 (like ppc for
powerpc)? and then it is able to only resereve the variables for x86_64. I have
prepared a patch for this goal in our new tinyconfig patchset, it will further
avoid adding the same nolibc-test-x86.config and nolibc-test-x86_64.config.

Best regards,
Zhangjin

> Thanks,
> Willy