linux-kernel - Re: [PATCH v6 0/6] Introduce GCC plugin infrastructure

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Message-ID: <20160412184147.GA92432@davidb.org>
Date:	Tue, 12 Apr 2016 12:41:47 -0600
From:	David Brown <david.brown@...aro.org>
To:	Kees Cook <keescook@...omium.org>
Cc:	Emese Revfy <re.emese@...il.com>,
	Masahiro Yamada <yamada.masahiro@...ionext.com>,
	Michal Marek <mmarek@...e.com>,
	linux-kbuild <linux-kbuild@...r.kernel.org>,
	PaX Team <pageexec@...email.hu>,
	Brad Spengler <spender@...ecurity.net>,
	"kernel-hardening@...ts.openwall.com" 
	<kernel-hardening@...ts.openwall.com>,
	Rasmus Villemoes <linux@...musvillemoes.dk>,
	Fengguang Wu <fengguang.wu@...el.com>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 0/6] Introduce GCC plugin infrastructure

On Tue, Apr 12, 2016 at 11:27:52AM -0700, Kees Cook wrote:

>Awesome! Thanks for testing this. I still need to finish getting my
>arm64 environment built...

I've been using:
  http://releases.linaro.org/components/toolchain/binaries/

for most stuff.

>Do you happen to know if there's already a gcc bug open for the make
>install problem?

Linaro toolchain bug:
  https://bugs.linaro.org/show_bug.cgi?id=2123

Patch to fix it
  https://gcc.gnu.org/ml/gcc-patches/2016-03/msg00522.html

It is supposed to be included in the linaro 5.3-2016.03 snapshot.
I've pinged Christophe to see if I can get any insight into when that
will be available.

It is kind of nice to see that when it fails, it prints a helpful
message, though:

  scripts/Makefile.gcc-plugins:22: *** error, your gcc installation does not support plugins, perhaps the necessary headers are missing?.  Stop.

I think it is OK to include this, even with the patches still bubbling
through gcc releases.  It prints a helpful message when it doesn't
work, and is only going to be selected if specifically requested.

David