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Subject: Re: Build failure: -Wno-unused-const-variable DNE on old GCC
From: Joe Perches <joe@perches.com>
To: Brian Norris <computersforpeace@gmail.com>, Michael Ellerman
 <mpe@ellerman.id.au>
Cc: Anton Blanchard <anton@au1.ibm.com>, Ian Munsie <imunsie@au1.ibm.com>,
 Michael Neuling <mikey@neuling.org>, linuxppc-dev@lists.ozlabs.org,
 linux-kernel@vger.kernel.org, Michal Marek <mmarek@suse.com>
Date: Thu, 07 Jan 2016 11:37:24 -0800
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References: <20160107185406.GA65420@google.com>
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On Thu, 2016-01-07 at 10:54 -0800, Brian Norris wrote:
> 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.

drivers/misc/cxl/Makefile:ccflags-y := -Werror -Wno-unused-const-variable

You could take that -Wno-unused-const-variable out of the
Makefile or maybe add something like:

$(call cc-ifversion, -ge, 0530, -Wno-unused-const-variable)

or whatever gcc version actually added that unused-const-variable check