linux-kernel - Re: [PATCH v2 3/3] selftests/nolibc: fix up O= option support

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Date:   Sun,  6 Aug 2023 20:17:21 +0800
From:   Zhangjin Wu <falcon@...ylab.org>
To:     w@....eu
Cc:     arnd@...db.de, falcon@...ylab.org, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org, linux@...ssschuh.net,
        thomas@...ch.de
Subject: Re: [PATCH v2 3/3] selftests/nolibc: fix up O= option support

> On Sat, Aug 05, 2023 at 02:13:11PM +0800, Zhangjin Wu wrote:
> > To avoid pollute the source code tree and avoid mrproper for every
> > architecture switch, the O= argument must be supported.
> > 
> > Both IMAGE and .config are from the building directory, let's use
> > objtree instead of srctree for them.
> > 
> > If no O= option specified, means building kernel in source code tree,
> > objtree should be srctree in such case.
> > 
> > To support relative path, as suggested by Thomas, $(COMMAND_O) is used
> > to pass the O=$(ABSOLUTE_O) to the $(MAKE) commands.
> 
> Zhangjin, I cannot get this one to work, regardless of what I try:
> 
>    $ make -j8 O=$PWD/output-i386 nolibc-test XARCH=i386 CROSS_COMPILE=/f/tc/nolibc/gcc-12.3.0-nolibc/i386-linux/bin/i386-linux- CC=/f/tc/nolibc/gcc-12.3.0-nolibc/i386-linux/bin/i386-linux-gcc
>    (...)
>    CC      nolibc-test
>    In file included from sysroot/i386/include/stdio.h:14,
>                     from nolibc-test.c:13:
>    sysroot/i386/include/errno.h:10:10: fatal error: asm/errno.h: No such file or directory
>       10 | #include <asm/errno.h>
>          |          ^~~~~~~~~~~~~
>    compilation terminated.
>

Willy, I also just reproduced the issue, seems only i386 sysroot has no
asm/errno.h, will check why it is no rightly installed later.

    $ find sysroot/ -name "errno.h"
    sysroot/arm/include/errno.h
    sysroot/arm/include/asm-generic/errno.h
    sysroot/arm/include/asm/errno.h
    sysroot/arm/include/linux/errno.h
    sysroot/riscv/include/errno.h
    sysroot/riscv/include/asm-generic/errno.h
    sysroot/riscv/include/asm/errno.h
    sysroot/riscv/include/linux/errno.h
    sysroot/s390/include/errno.h
    sysroot/s390/include/asm-generic/errno.h
    sysroot/s390/include/asm/errno.h
    sysroot/s390/include/linux/errno.h
    sysroot/arm64/include/errno.h
    sysroot/arm64/include/asm-generic/errno.h
    sysroot/arm64/include/asm/errno.h
    sysroot/arm64/include/linux/errno.h
    sysroot/mips/include/errno.h
    sysroot/mips/include/asm-generic/errno.h
    sysroot/mips/include/asm/errno.h
    sysroot/mips/include/linux/errno.h
    sysroot/x86_64/include/errno.h
    sysroot/x86_64/include/asm-generic/errno.h
    sysroot/x86_64/include/asm/errno.h
    sysroot/x86_64/include/linux/errno.h
    sysroot/i386/include/errno.h
    sysroot/i386/include/asm-generic/errno.h
    sysroot/i386/include/linux/errno.h
    sysroot/powerpc/include/errno.h
    sysroot/powerpc/include/asm-generic/errno.h
    sysroot/powerpc/include/asm/errno.h
    sysroot/powerpc/include/linux/errno.h

> I'll leave it aside for now as I've spent way longer than I hoped on
> these series. I could take the previous two patches however.
>

Ok, let's ignore this one, I will find why sysroot not install well for i386.

Thanks,
Zhangjin

> Thanks,
> Willy