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

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Message-ID: <568EC026.2020207@suse.com>
Date:	Thu, 7 Jan 2016 20:44:38 +0100
From:	Michal Marek <mmarek@...e.com>
To:	Joe Perches <joe@...ches.com>,
	Brian Norris <computersforpeace@...il.com>,
	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
Subject: Re: Build failure: -Wno-unused-const-variable DNE on old GCC

Dne 7.1.2016 v 20:37 Joe Perches napsal(a):
> 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

We have cc-disable-warning for this.

Michal