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

Michal Marek mmarek at suse.com
Fri Jan 8 06:44:38 AEDT 2016


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



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