linux-kernel - Re: [PATCH v5 21/31] kconfig: show compiler version text in the top comment

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Date:   Fri, 8 Jun 2018 16:04:35 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     linux-kbuild <linux-kbuild@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Kees Cook <keescook@...omium.org>,
        Nicholas Piggin <npiggin@...il.com>,
        "Luis R . Rodriguez" <mcgrof@...e.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Ulf Magnusson <ulfalizer@...il.com>,
        Sam Ravnborg <sam@...nborg.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH v5 21/31] kconfig: show compiler version text in the top comment

Hi Geert,


2018-06-07 17:58 GMT+09:00 Masahiro Yamada <yamada.masahiro@...ionext.com>:
> Hi Geert,
>
>
> 2018-06-07 17:42 GMT+09:00 Geert Uytterhoeven <geert@...ux-m68k.org>:
>> Hi Yamada-san,
>>
>> On Mon, May 28, 2018 at 11:21 AM, Masahiro Yamada
>> <yamada.masahiro@...ionext.com> wrote:
>>> The kernel configuration phase is now tightly coupled with the compiler
>>> in use.  It will be nice to show the compiler information in Kconfig.
>>>
>>> The compiler information will be displayed like this:
>>>
>>>   $ make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- config
>>>   scripts/kconfig/conf  --oldaskconfig Kconfig
>>>   *
>>>   * Linux/arm64 4.16.0-rc1 Kernel Configuration
>>>   *
>>>   *
>>>   * Compiler: aarch64-linux-gnu-gcc (Linaro GCC 7.2-2017.11) 7.2.1 20171011
>>>   *
>>>   *
>>>   * General setup
>>>   *
>>>   Compile also drivers which will not load (COMPILE_TEST) [N/y/?]
>>>
>>> If you use GUI methods such as menuconfig, it will be displayed in the
>>> top menu.
>>>
>>> This is simply implemented by using the 'comment' statement.  So, it
>>> will be saved into the .config file as well.
>>>
>>> This commit has a very important meaning.  If the compiler is upgraded,
>>> Kconfig must be re-run since different compilers have different sets
>>> of supported options.
>>>
>>> All referenced environments are written to include/config/auto.conf.cmd
>>> so that any environment change triggers syncconfig, and prompt the user
>>> to input new values if needed.
>>>
>>> With this commit, something like follows will be added to
>>> include/config/auto.conf.cmd
>>>
>>>   ifneq "$(CC_VERSION_TEXT)" "aarch64-linux-gnu-gcc (Linaro GCC 7.2-2017.11) 7.2.1 20171011"
>>>   include/config/auto.conf: FORCE
>>>   endif
>>>
>>> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
>>> Reviewed-by: Kees Cook <keescook@...omium.org>
>>
>> This is now commit 21c54b774744719c ("kconfig: show compiler version text
>> in the top comment") upstream.
>>
>> This commit broke cross-compilation for me:
>>
>>     $ make ARCH=m68k
>>     scripts/kconfig/conf  --syncconfig Kconfig
>>     scripts/kconfig/conf  --syncconfig Kconfig
>>     scripts/kconfig/conf  --syncconfig Kconfig
>>     scripts/kconfig/conf  --syncconfig Kconfig
>>     ...
>>
>> with O=:
>>
>>       GEN     ./Makefile
>>      scripts/kconfig/conf  --syncconfig Kconfig
>>       GEN     ./Makefile
>>     scripts/kconfig/conf  --syncconfig Kconfig
>>       GEN     ./Makefile
>>     scripts/kconfig/conf  --syncconfig Kconfig
>>       GEN     ./Makefile
>>     ...
>>
>> .config gained (both with/without O=):
>>
>>     #
>>     # Compiler: gcc (Ubuntu 5.4.0-6ubuntu1~16.04.9) 5.4.0 20160609
>>     #
>>
>> which is definitely wrong when cross-compiling for m68k.
>>
>> Reverting the commit, and fixing up the conflicts, fixes the issue for me
>>
>> Do you have a clue?
>> Thanks!
>
>
> Agh, I missed the case where CROSS_COMPILE is
> set by arch/$(SRCARCH)/Makefile.
>
>
> I will fix it.  Thanks for the report!


I posted a patch.
https://patchwork.kernel.org/patch/10453685/

I hope it will fix your problem.


Thanks,

-- 
Best Regards
Masahiro Yamada