linux-kernel - Re: [PATCH] kconfig: add KCONFIG_ALLCONFIG support for tinyconfig

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Date:   Sat, 5 Mar 2022 02:06:47 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Randrianaina Georges Aaron <georges-aaron.randrianaina@...sa.fr>
Cc:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Mathieu Acher <mathieu.acher@...sa.fr>
Subject: Re: [PATCH] kconfig: add KCONFIG_ALLCONFIG support for tinyconfig

On Fri, Mar 4, 2022 at 2:27 AM Randrianaina Georges Aaron
<georges-aaron.randrianaina@...sa.fr> wrote:
>
> Since f8f0d06438e5, tinyconfig overrides KCONFIG_ALLCONFIG to
> include kernel/configs/tiny-base.config. However, this ignores
> user's preset if defined.
>
> This modification checks if the user has set KCONFIG_ALLCONFIG
> and if so, concatenates it with kernel/configs/tiny-base.config
> to be used as preset config symbols.
>
> Signed-off-by: Randrianaina Georges Aaron <georges-aaron.randrianaina@...sa.fr>
> ---
>  scripts/kconfig/Makefile | 6 ++++++
>  1 file changed, 6 insertions(+)
>
> diff --git a/scripts/kconfig/Makefile b/scripts/kconfig/Makefile
> index b8ef0fb4bbef..337693fb4762 100644
> --- a/scripts/kconfig/Makefile
> +++ b/scripts/kconfig/Makefile
> @@ -102,7 +102,13 @@ configfiles=$(wildcard $(srctree)/kernel/configs/$@ $(srctree)/arch/$(SRCARCH)/c
>
>  PHONY += tinyconfig
>  tinyconfig:
> +ifeq ($(KCONFIG_ALLCONFIG),)
>         $(Q)KCONFIG_ALLCONFIG=kernel/configs/tiny-base.config $(MAKE) -f $(srctree)/Makefile allnoconfig
> +else
> +       $(Q)cat $(KCONFIG_ALLCONFIG) <(echo) kernel/configs/tiny-base.config > .tmp.config


I assume "<(echo)" exists here to insert a blank line.
The process substitution is a bash'ism.

If you execute it on Debian or its variants, where /bin/sh is a symlink
to dash, it fails.

masahiro@...ver:~/ref/linux$ make  KCONFIG_ALLCONFIG=/tmp/dummy.config
tinyconfig
/bin/sh: 1: Syntax error: "(" unexpected
make[1]: *** [scripts/kconfig/Makefile:108: tinyconfig] Error 2
make: *** [Makefile:619: tinyconfig] Error 2



We can delete '<(echo)', but another issue is that this does not work
with O=<dir> option.


masahiro@...ver:~/ref/linux$ make O=foo
KCONFIG_ALLCONFIG=/tmp/dummy.config tinyconfig
make[1]: Entering directory '/home/masahiro/ref/linux/foo'
  GEN     Makefile
  HOSTCC  scripts/basic/fixdep
cat: kernel/configs/tiny-base.config: No such file or directory
make[2]: *** [../scripts/kconfig/Makefile:108: tinyconfig] Error 1
make[1]: *** [/home/masahiro/ref/linux/Makefile:619: tinyconfig] Error 2
make[1]: Leaving directory '/home/masahiro/ref/linux/foo'
make: *** [Makefile:219: __sub-make] Error 2





> +       $(Q)KCONFIG_ALLCONFIG=.tmp.config $(MAKE) -f $(srctree)/Makefile allnoconfig
> +       $(Q)rm -f .tmp.config
> +endif
>         $(Q)$(MAKE) -f $(srctree)/Makefile tiny.config
>
>  # CHECK: -o cache_dir=<path> working?
> --
> 2.34.1



--
Best Regards
Masahiro Yamada