linux-kernel - Re: [GIT PULL 2/2] Kconfig updates for v4.18

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Date:   Mon, 18 Jun 2018 08:25:04 -0500
From:   ebiederm@...ssion.com (Eric W. Biederman)
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        masahiroy@...nel.org
Subject: Re: [GIT PULL 2/2] Kconfig updates for v4.18

Masahiro Yamada <yamada.masahiro@...ionext.com> writes:

> - drop CONFIG_CROSS_COMPILE support

aka
> commit f1089c92da791034af73478159626007cba7f092
> Author: Masahiro Yamada <yamada.masahiro@...ionext.com>
> Date:   Mon May 28 18:21:39 2018 +0900
> 
>     kbuild: remove CONFIG_CROSS_COMPILE support
>     
>     Kbuild provides a couple of ways to specify CROSS_COMPILE:
>     
>     [1] Command line
>     [2] Environment
>     [3] arch/*/Makefile (only some architectures)
>     [4] CONFIG_CROSS_COMPILE
>     
>     [4] is problematic for the compiler capability tests in Kconfig.
>     CONFIG_CROSS_COMPILE allows users to change the compiler prefix from
>     'make menuconfig', etc.  It means, the compiler options would have
>     to be all re-calculated everytime CONFIG_CROSS_COMPILE is changed.
>     
>     To avoid complexity and performance issues, I'd like to evaluate
>     the shell commands statically, i.e. only parsing Kconfig files.
>     
>     I guess the majority is [1] or [2].  Currently, there are only
>     5 defconfig files that specify CONFIG_CROSS_COMPILE.
>       arch/arm/configs/lpc18xx_defconfig
>       arch/hexagon/configs/comet_defconfig
>       arch/nds32/configs/defconfig
>       arch/openrisc/configs/or1ksim_defconfig
>       arch/openrisc/configs/simple_smp_defconfig
>     
>     Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
>     Reviewed-by: Kees Cook <keescook@...omium.org>
> 

I just started working against 4.18-rc1 and discovered this.

This has broken my setup for building and testing changes on other
architectures.  I have to put the name of the compiler prefix somewhere.
The mapping between the prefix to gcc and the linux architecture is
non-trivial.  Especially with a lot of architectures in the test pool.

I am tired and frustrated this morning as this is going to keep me from
getting done what I had planned today.

This is a regression pure and simple.  It breaks my workflow.  Please
fix it.

Eric