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

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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

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Build failure: -Wno-unused-const-variable DNE on old GCC Brian Norris <computersforpeace@gmail.com> - 2016-01-07 20:00 +0100
  Re: Build failure: -Wno-unused-const-variable DNE on old GCC Joe Perches <joe@perches.com> - 2016-01-07 20:40 +0100
    Re: Build failure: -Wno-unused-const-variable DNE on old GCC Michal Marek <mmarek@suse.com> - 2016-01-07 20:50 +0100
      Re: Build failure: -Wno-unused-const-variable DNE on old GCC Joe Perches <joe@perches.com> - 2016-01-07 21:00 +0100
        Re: Build failure: -Wno-unused-const-variable DNE on old GCC Brian Norris <computersforpeace@gmail.com> - 2016-01-07 21:20 +0100
          [PATCH] misc: cxl: fix build for GCC 4.6.x Brian Norris <computersforpeace@gmail.com> - 2016-01-07 21:40 +0100
            Re: [PATCH] misc: cxl: fix build for GCC 4.6.x Michael Ellerman <mpe@ellerman.id.au> - 2016-01-08 03:20 +0100
  Re: Build failure: -Wno-unused-const-variable DNE on old GCC Arnd Bergmann <arnd@arndb.de> - 2016-01-07 21:30 +0100
    Re: Build failure: -Wno-unused-const-variable DNE on old GCC Daniel Axtens <dja@axtens.net> - 2016-01-08 00:00 +0100
      Re: Build failure: -Wno-unused-const-variable DNE on old GCC Brian Norris <computersforpeace@gmail.com> - 2016-01-08 00:10 +0100
        Re: Build failure: -Wno-unused-const-variable DNE on old GCC Ian Munsie <imunsie@au1.ibm.com> - 2016-01-08 02:40 +0100
          Re: Build failure: -Wno-unused-const-variable DNE on old GCC Brian Norris <computersforpeace@gmail.com> - 2016-01-08 03:10 +0100
            Re: Build failure: -Wno-unused-const-variable DNE on old GCC Michael Ellerman <mpe@ellerman.id.au> - 2016-01-08 03:20 +0100
              RE: Build failure: -Wno-unused-const-variable DNE on old GCC David Laight <David.Laight@ACULAB.COM> - 2016-01-08 11:20 +0100
    Re: Build failure: -Wno-unused-const-variable DNE on old GCC Ian Munsie <imunsie@au1.ibm.com> - 2016-01-08 02:40 +0100

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