linux-kernel - Re: enabling COMPILE_TEST support for GCC plugins in v4.11

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Message-ID: <CAGXu5j+rbSkPfHQRhh8uLDGQd4RUt01Hj5fEZgQWo_B7+UHv5Q@mail.gmail.com>
Date:   Fri, 23 Jun 2017 11:35:56 -0700
From:   Kees Cook <keescook@...gle.com>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     Paul Gortmaker <paul.gortmaker@...driver.com>,
        Tony Breeds <tony@...eyournoodle.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Arnd Bergmann <arnd@...db.de>,
        Randy Dunlap <rdunlap@...radead.org>,
        Olof Johansson <olof@...om.net>,
        Mark Brown <broonie@...nel.org>, info@...nelci.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Will Deacon <will.deacon@....com>,
        Russell King - ARM Linux <linux@....linux.org.uk>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux-Next <linux-next@...r.kernel.org>,
        Fengguang Wu <fengguang.wu@...el.com>,
        Andrew Donnellan <andrew.donnellan@....ibm.com>,
        Laura Abbott <labbott@...hat.com>,
        "x86@...nel.org" <x86@...nel.org>
Subject: Re: enabling COMPILE_TEST support for GCC plugins in v4.11

On Thu, Jun 22, 2017 at 10:43 PM, Michael Ellerman <mpe@...erman.id.au> wrote:
> [Old thread just popped up in my inbox]
>
> Kees Cook <keescook@...gle.com> writes:
>> On Thu, Dec 8, 2016 at 5:52 PM, Paul Gortmaker
>> <paul.gortmaker@...driver.com> wrote:
>>> On Thu, Dec 8, 2016 at 2:00 PM, Kees Cook <keescook@...gle.com> wrote:
>>>> Hi,
>>>>
>>>> I'd like to get the GCC plugins building under
>>>> allyesconfig/allmodconfig for -next soon (with the intention of
>>>> landing the change in v4.11). Specifically, I intend to revert
>>>> a519167e753e ("gcc-plugins: disable under COMPILE_TEST").
>>>
>>> If I recall correctly, I noted that the plugins broke the kernel.org
>>> cross compiler toolchains which led to the above disable.
>>
>> Do you mean these?
>> https://www.kernel.org/pub/tools/crosstool/
>
> I think those are the ones Paul is talking about.
>
> Those were mostly built by Tony, who is know, sadly, an Openstack
> developer and for some reason doesn't seem to have time to build
> toolchains for kernel hackers :P
>
>
> As folks may have seen on LWN, there are now pre-built toolchains for
> many architectures available from the Free Electrons guys, so that may
> help to unblock this situation somewhat:
>
> http://toolchains.free-electrons.com/

Perhaps we should add a link in pub/tools/crosstool/ ? 4.6.3 is pretty
old at this point, but the Free Electrons toolchains don't include
some of the less used architectures.

-Kees

-- 
Kees Cook
Pixel Security