Re: [PATCH] gcc-plugins: make it possible to disable CONFIG_GCC_PLUGINS again
From: Masahiro Yamada
Date: Wed Dec 11 2019 - 23:52:36 EST
On Wed, Dec 11, 2019 at 10:40 PM Arnd Bergmann <arnd@xxxxxxxx> 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@xxxxxxxx>
Reviewed-by: Masahiro Yamada <masahiroy@xxxxxxxxxx>