linux-kernel - Re: [PATCH] gcc-plugins: make it possible to disable CONFIG_GCC

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Date:   Thu, 12 Dec 2019 13:51:26 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Kees Cook <keescook@...omium.org>,
        Emese Revfy <re.emese@...il.com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Kernel Hardening <kernel-hardening@...ts.openwall.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>
Subject: Re: [PATCH] gcc-plugins: make it possible to disable
 CONFIG_GCC_PLUGINS again

On Wed, Dec 11, 2019 at 10:40 PM Arnd Bergmann <arnd@...db.de> wrote:
>
> I noticed that randconfig builds with gcc no longer produce a lot of
> ccache hits, unlike with clang, and traced this back to plugins
> now being enabled unconditionally if they are supported.
>
> I am now working around this by adding
>
>    export CCACHE_COMPILERCHECK=/usr/bin/size -A %compiler%
>
> to my top-level Makefile. This changes the heuristic that ccache uses
> to determine whether the plugins are the same after a 'make clean'.
>
> However, it also seems that being able to just turn off the plugins is
> generally useful, at least for build testing it adds noticeable overhead
> but does not find a lot of bugs additional bugs, and may be easier for
> ccache users than my workaround.
>
> Fixes: 9f671e58159a ("security: Create "kernel hardening" config area")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---

Reviewed-by: Masahiro Yamada <masahiroy@...nel.org>


-- 
Best Regards
Masahiro Yamada