linux-kernel - Build failure: -Wno-unused-const-variable DNE on old GCC

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Message-ID: <20160107185406.GA65420@google.com>
Date:	Thu, 7 Jan 2016 10:54:06 -0800
From:	Brian Norris <computersforpeace@...il.com>
To:	Michael Ellerman <mpe@...erman.id.au>
Cc:	Anton Blanchard <anton@....ibm.com>,
	Ian Munsie <imunsie@....ibm.com>,
	Michael Neuling <mikey@...ling.org>,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	Michal Marek <mmarek@...e.com>
Subject: Build failure: -Wno-unused-const-variable DNE on old GCC

Hi,

I'm using a GCC 4.6.3 compiler for some compile tests, and I noticed
that commit 2cd55c68c0a4 ("cxl: Fix build failure due to -Wunused-variable
behaviour change") breaks my builds, because the
-Wno-unused-const-variable doesn't exist on GCC 4.6.3.

  drivers/misc/cxl/base.c: At top level:
  cc1: error: unrecognized command line option "-Wno-unused-const-variable" [-Werror]

Any thoughts on how to best fix this? I'd like not to have to scrounge
up a new cross compiler just for build tests.

Regards,
Brian