linux-hardening - Re: [PATCH] gcc-plugins: simplify GCC plugin-dev capability test

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Date:   Tue, 19 Jan 2021 18:48:21 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     Jon Hunter <jonathanh@...dia.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Kees Cook <keescook@...omium.org>,
        Emese Revfy <re.emese@...il.com>,
        linux-hardening@...r.kernel.org,
        Nathan Chancellor <natechancellor@...il.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-tegra <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH] gcc-plugins: simplify GCC plugin-dev capability test

On Fri, Dec 18, 2020 at 08:33:37PM +0000, Jon Hunter wrote:
> 
> On 18/12/2020 17:54, Linus Torvalds wrote:
> > On Fri, Dec 18, 2020 at 7:33 AM Jon Hunter <jonathanh@...dia.com> wrote:
> >>
> >> However, if you are saying that this is a problem/bug with our builders,
> >> then of course we will have to get this fixed.
> > 
> > This seems to be a package dependency problem with the gcc plugins -
> > they clearly want libgmp, but apparently the package hasn't specified
> > that dependency.
> > 
> > If this turns out to be a big problem, I guess we can't simplify the
> > plugin check after all.
> > 
> > We historically just disabled gcc-plugins if that header didn't build,
> > which obviously meant that it "worked" for people, but it also means
> > that clearly the coverage can't have been as good as it could/should
> > be.
> > 
> > So if it's as simple as just installing the GNU multiprecision
> > libraries ("gmp-devel" on most rpm-based systems, "libgmp-dev" on most
> > debian systems), then I think that's the right thing to do. You'll get
> > a working build again, and equally importantly, your build servers
> > will actually do a better job of covering the different build options.
> 
> 
> Thanks. I have reported this issue to the team that administers the
> builders. So hopefully, they will install the necessary packages for us
> now.

Just to close the loop on this, the builders now have libgmp-dev and
libmpc-dev packages installed and the builds are passing without the
workaround we had used.

Thierry

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