linux-kernel - Re: [kernel-hardening] [PATCH v8 2/4] GCC plugin infrastructure

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Message-ID: <573D5D7F.60000@au1.ibm.com>
Date:	Thu, 19 May 2016 16:30:23 +1000
From:	Andrew Donnellan <andrew.donnellan@....ibm.com>
To:	Michael Ellerman <mpe@...erman.id.au>,
	Emese Revfy <re.emese@...il.com>,
	kernel-hardening@...ts.openwall.com
Cc:	linux-kbuild@...r.kernel.org, pageexec@...email.hu,
	spender@...ecurity.net, mmarek@...e.com, keescook@...omium.org,
	linux@...musvillemoes.dk, fengguang.wu@...el.com,
	dvyukov@...gle.com, linux-kernel@...r.kernel.org,
	david.brown@...aro.org, yamada.masahiro@...ionext.com,
	linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
	Daniel Axtens <dja@...ens.net>
Subject: Re: [kernel-hardening] [PATCH v8 2/4] GCC plugin infrastructure

On 19/05/16 16:22, Michael Ellerman wrote:
>> Did you test the plugins with all gcc versions (4.5-6)?
>
> What's the concern about gcc versions? Just not breaking the build on old
> compilers?
> I'm pretty sure powerpc big endian still builds with gcc 4.4.

gcc's plugin support only landed in 4.5, so we don't care about <=4.4.

> However if Andrew's only tested on little endian, then that select should be
> guarded with an "if CPU_LITTLE_ENDIAN". And to build LE you need gcc >= 4.9.

I'm going to give BE a test too just to be sure.

-- 
Andrew Donnellan              OzLabs, ADL Canberra
andrew.donnellan@....ibm.com  IBM Australia Limited