[PATCH] misc: cxl: fix build for GCC 4.6.x

[Brian Norris <computersforpeace@gmail.com>]

GCC 4.6.3 does not support -Wno-unused-const-variable. Instead, use the
kbuild infrastructure that checks if this options exists.

Also drop -Werror, since it's harmful, if forced on the user. New GCC's,
or higher warning verbosities (e.g., W=1) can easily kill the build
where they shouldn't.

Suggested-by: Michal Marek <mmarek@suse.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
---

On Thu, Jan 07, 2016 at 12:18:26PM -0800, Brian Norris wrote:
> On Thu, Jan 07, 2016 at 11:57:31AM -0800, Joe Perches wrote:
> > On Thu, 2016-01-07 at 20:44 +0100, Michal Marek wrote:
> > > We have cc-disable-warning for this.
> > 
> > Thanks Michal.
> 
> Cool, thanks! I'll send a patch to use that instead.

 drivers/misc/cxl/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/misc/cxl/Makefile b/drivers/misc/cxl/Makefile
index 6982f603fadc..0163d4d1fd1e 100644
--- a/drivers/misc/cxl/Makefile
+++ b/drivers/misc/cxl/Makefile
@@ -1,4 +1,4 @@
-ccflags-y := -Werror -Wno-unused-const-variable
+ccflags-y := $(call cc-disable-warning, unused-const-variable)
 
 cxl-y				+= main.o file.o irq.o fault.o native.o
 cxl-y				+= context.o sysfs.o debugfs.o pci.o trace.o
-- 
2.6.0.rc2.230.g3dd15c0