Messages in this thread | | | Date | Thu, 7 Jan 2016 12:18:26 -0800 | From | Brian Norris <> | Subject | Re: Build failure: -Wno-unused-const-variable DNE on old GCC |
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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: > > Dne 7.1.2016 v 20:37 Joe Perches napsal(a): > > > On Thu, 2016-01-07 at 10:54 -0800, Brian Norris wrote: > > > > 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. > > Thanks Michal.
Cool, thanks! I'll send a patch to use that instead.
> Perhaps most uses of -Werror without some CONFIG_<FOO> guard > should be removed or replaced by some other mechanism.
+1000. I'd personally like to see all one-off uses of -Werror removed.
> $ git grep -E "=\s*\-Werror" | grep -v CONFIG > [...] > arch/alpha/lib/Makefile:ccflags-y := -Werror > arch/alpha/mm/Makefile:ccflags-y := -Werror > arch/alpha/oprofile/Makefile:ccflags-y := -Werror -Wno-sign-compare > arch/metag/oprofile/Makefile:ccflags-y += -Werror > arch/mips/Kbuild:subdir-ccflags-y := -Werror
^^ I always patch this one out when build-testing MIPS, since I like to turn up warning levels (e.g., W=1), but not kill the build entirely.
Regards, Brian
> arch/sh/cchips/hd6446x/Makefile:ccflags-y := -Werror > arch/sh/kernel/Makefile:ccflags-y := -Werror > arch/sh/lib/Makefile:ccflags-y := -Werror > arch/sh/mm/Makefile:ccflags-y := -Werror > arch/sparc/kernel/Makefile:ccflags-y := -Werror > arch/sparc/lib/Makefile:ccflags-y := -Werror > arch/sparc/mm/Makefile:ccflags-y := -Werror > arch/sparc/prom/Makefile:ccflags := -Werror > drivers/gpu/drm/tilcdc/Makefile: ccflags-y += -Werror > drivers/misc/cxl/Makefile:ccflags-y := -Werror -Wno-unused-const-variable > drivers/scsi/aic7xxx/Makefile:ccflags-y += -Werror > drivers/scsi/lpfc/Makefile:ccflags-y += -Werror >
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