linux-kernel - Re: [GIT PULL] gcc-plugins updates for v5.11-rc1

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Message-ID: <CAHk-=wieoN5ttOy7SnsGwZv+Fni3R6m-Ut=oxih6bbZ28G+4dw@mail.gmail.com>
Date:   Fri, 18 Dec 2020 10:50:22 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Masahiro Yamada <masahiroy@...nel.org>
Subject: Re: [GIT PULL] gcc-plugins updates for v5.11-rc1

On Wed, Dec 16, 2020 at 12:23 PM Kees Cook <keescook@...omium.org> wrote:
>
> Hmm. Yeah, that's a bug. I think that's an existing bug, though. I feel
> like I scratched my head on that too. I will see if there is a sensible
> way to have Kbuild "notice" that -- I hope there's an easier way to
> invalidate all object files instead of adding all the plugins as a dep
> to all .o builds. O_o

Side note, there's actually a more annoying issue with the gcc plugin
config code.

Namely that when I get a compiler update, the rest of the Kconfig
system is smart, and rebuilds all my files.

The gcc-plugins code? The code that *really* depends on the compiler
version even more? Yeah, not so much. It ends up instead causing a
build error like

   cc1: error: incompatible gcc/plugin versions
   cc1: error: failed to initialize plugin
./scripts/gcc-plugins/stackleak_plugin.so

because the plugins don't depend on the compiler version.

Again, this is not new, but it's another example of how fragile and
annoying the gcc-plugins code can be.

               Linus