linux-kernel - Re: [PATCH 0/3] x86 bugfixes for LTO

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Message-ID: <151821507347.9954.4785393248908071074@mail.alporthouse.com>
Date:   Fri, 09 Feb 2018 22:24:33 +0000
From:   Chris Wilson <chris@...is-wilson.co.uk>
To:     Arnd Bergmann <arnd@...db.de>, x86@...nel.org
Cc:     "Nicolas Pitre" <nico@...aro.org>,
        "Andi Kleen" <ak@...ux.intel.com>, linux-kernel@...r.kernel.org,
        "Arnd Bergmann" <arnd@...db.de>
Subject: Re: [PATCH 0/3] x86 bugfixes for LTO

Quoting Arnd Bergmann (2018-02-02 14:54:28)
> Here are three bugfixes for x86 that I needed to get LTO-enabled
> kernels to build reliably. I'm not sure abouto that first one
> though.

Is there a howto on how to build LTO kernels? I tried Andi's lto-415-2
branch, but linking fails with lots of arcane PIE-vs-PIC errors. We are
wanting to investigate how we can use LTO to reduce our (i915.ko) module
size (by e.g. supporting a subset of chipsets).
-Chris