linux-kernel - Re: [PATCH] Fix the oldconfig target rule

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Message-ID: <AM5PR0701MB265789020943AD2E03E81AD2E4450@AM5PR0701MB2657.eurprd07.prod.outlook.com>
Date:   Sun, 8 Jul 2018 08:09:01 +0000
From:   Bernd Edlinger <bernd.edlinger@...mail.de>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        "linux-kbuild@...r.kernel.org" <linux-kbuild@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Fix the oldconfig target rule

On 07/08/18 08:31, Bernd Edlinger wrote:
> The next make after an oldconfig reads in the outdated
> include/config/auto.conf which can kill the make before
> it is able to call the syncconfig target.
> 
> $ make defconfig
> *** Default configuration is based on 'x86_64_defconfig'
> $ make
> scripts/kconfig/conf  --syncconfig Kconfig
> Makefile:936: *** "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y,
> please install libelf-dev, libelf-devel or elfutils-libelf-devel".  Stop.
> 
> $ sed -i s/CONFIG_UNWINDER_ORC=y// .configs
> $ make oldconfig
> Choose kernel unwinder
>> 1. ORC unwinder (UNWINDER_ORC) (NEW)
>    2. Frame pointer unwinder (UNWINDER_FRAME_POINTER)
> choice[1-2?]: 2
> $ make
> Makefile:936: *** "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y,
> please install libelf-dev, libelf-devel or elfutils-libelf-devel".  Stop.
> 
> With this patch oldconfig and similar targets like
> menuconfig call syncconfig to avoid this failure.
> 
> Signed-off-by: Bernd Edlinger <bernd.edlinger@...mail.de>
> ---
>   scripts/kconfig/Makefile | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/scripts/kconfig/Makefile b/scripts/kconfig/Makefile
> index a3ac2c9..ef34275 100644
> --- a/scripts/kconfig/Makefile
> +++ b/scripts/kconfig/Makefile
> @@ -62,6 +62,7 @@ PHONY += $(simple-targets)
> 
>   $(simple-targets): $(obj)/conf
>       $< $(silent) --$@ $(Kconfig)
> +    $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig

On second thought, removing the auto.conf might be sufficient:
$(Q)rm -f include/config/auto.conf include/config/auto.conf.cmd

Would you prefer that?


> 
>   PHONY += oldnoconfig silentoldconfig savedefconfig defconfig
>