Check for -Wno-unused-but-set-variable gcc support

Gcc versions 4.3.2 and earlier do not support the compiler flag -Wno-unused-but-set-variable. This can lead to build failures on older Linux platforms such as Debian Lenny. Since this is an optional build argument this changes add a new autoconf check for the option. If it is supported by the installed version of gcc then it is used otherwise it is omited. See commit's 12c1acde76 and 79713039a2 for the reason the -Wno-unused-but-set-variable options was originally added.
2011-06-14 11:02:13 -07:00 · 2011-06-14 11:02:13 -07:00 · 8a7e1ceefa
parent 10715a0187
commit 8a7e1ceefa
57 changed files with 326 additions and 35 deletions
--- a/Makefile.in
+++ b/Makefile.in
@ -85,6 +85,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/user-ioctl.m4 \
 	$(top_srcdir)/config/user-libblkid.m4 \
 	$(top_srcdir)/config/user-libuuid.m4 \
+	$(top_srcdir)/config/user-no-unused-but-set-variable.m4 \
 	$(top_srcdir)/config/user-nptl_guard_within_stack.m4 \
 	$(top_srcdir)/config/user-selinux.m4 \
 	$(top_srcdir)/config/user-zlib.m4 $(top_srcdir)/config/user.m4 \
@ -233,6 +234,7 @@ MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
 NM = @NM@
 NMEDIT = @NMEDIT@
+NO_UNUSED_BUT_SET_VARIABLE = @NO_UNUSED_BUT_SET_VARIABLE@
 OBJDUMP = @OBJDUMP@
 OBJEXT = @OBJEXT@
 OTOOL = @OTOOL@
--- a/cmd/Makefile.in
+++ b/cmd/Makefile.in
@ -70,6 +70,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/user-ioctl.m4 \
 	$(top_srcdir)/config/user-libblkid.m4 \
 	$(top_srcdir)/config/user-libuuid.m4 \
+	$(top_srcdir)/config/user-no-unused-but-set-variable.m4 \
 	$(top_srcdir)/config/user-nptl_guard_within_stack.m4 \
 	$(top_srcdir)/config/user-selinux.m4 \
 	$(top_srcdir)/config/user-zlib.m4 $(top_srcdir)/config/user.m4 \
@ -201,6 +202,7 @@ MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
 NM = @NM@
 NMEDIT = @NMEDIT@
+NO_UNUSED_BUT_SET_VARIABLE = @NO_UNUSED_BUT_SET_VARIABLE@
 OBJDUMP = @OBJDUMP@
 OBJEXT = @OBJEXT@
 OTOOL = @OTOOL@
--- a/cmd/mount_zfs/Makefile.in
+++ b/cmd/mount_zfs/Makefile.in
@ -73,6 +73,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/user-ioctl.m4 \
 	$(top_srcdir)/config/user-libblkid.m4 \
 	$(top_srcdir)/config/user-libuuid.m4 \
+	$(top_srcdir)/config/user-no-unused-but-set-variable.m4 \
 	$(top_srcdir)/config/user-nptl_guard_within_stack.m4 \
 	$(top_srcdir)/config/user-selinux.m4 \
 	$(top_srcdir)/config/user-zlib.m4 $(top_srcdir)/config/user.m4 \
@ -202,6 +203,7 @@ MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
 NM = @NM@
 NMEDIT = @NMEDIT@
+NO_UNUSED_BUT_SET_VARIABLE = @NO_UNUSED_BUT_SET_VARIABLE@
 OBJDUMP = @OBJDUMP@
 OBJEXT = @OBJEXT@
 OTOOL = @OTOOL@
@ -306,7 +308,7 @@ DEFAULT_INCLUDES = -include ${top_builddir}/zfs_config.h \
 	-I$(top_srcdir)/include -I$(top_srcdir)/lib/libspl/include
 AM_LIBTOOLFLAGS = --silent
 AM_CFLAGS = -Wall -Wstrict-prototypes -fno-strict-aliasing \
-	-Wno-unused-but-set-variable ${DEBUG_CFLAGS} -D_GNU_SOURCE \
+	${NO_UNUSED_BUT_SET_VARIABLE} ${DEBUG_CFLAGS} -D_GNU_SOURCE \
 	-D__EXTENSIONS__ -D_REENTRANT -D_POSIX_PTHREAD_SEMANTICS \
 	-D_FILE_OFFSET_BITS=64 -D_LARGEFILE64_SOURCE \
 	-DTEXT_DOMAIN=\"zfs-linux-user\"
--- a/cmd/zdb/Makefile.in
+++ b/cmd/zdb/Makefile.in
@ -73,6 +73,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/user-ioctl.m4 \
 	$(top_srcdir)/config/user-libblkid.m4 \
 	$(top_srcdir)/config/user-libuuid.m4 \
+	$(top_srcdir)/config/user-no-unused-but-set-variable.m4 \
 	$(top_srcdir)/config/user-nptl_guard_within_stack.m4 \
 	$(top_srcdir)/config/user-selinux.m4 \
 	$(top_srcdir)/config/user-zlib.m4 $(top_srcdir)/config/user.m4 \
@ -203,6 +204,7 @@ MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
 NM = @NM@
 NMEDIT = @NMEDIT@
+NO_UNUSED_BUT_SET_VARIABLE = @NO_UNUSED_BUT_SET_VARIABLE@
 OBJDUMP = @OBJDUMP@
 OBJEXT = @OBJEXT@
 OTOOL = @OTOOL@
@ -302,7 +304,7 @@ DEFAULT_INCLUDES = -include ${top_builddir}/zfs_config.h \
 	-I$(top_srcdir)/include -I$(top_srcdir)/lib/libspl/include
 AM_LIBTOOLFLAGS = --silent
 AM_CFLAGS = -Wall -Wstrict-prototypes -fno-strict-aliasing \
-	-Wno-unused-but-set-variable ${DEBUG_CFLAGS} -D_GNU_SOURCE \
+	${NO_UNUSED_BUT_SET_VARIABLE} ${DEBUG_CFLAGS} -D_GNU_SOURCE \
 	-D__EXTENSIONS__ -D_REENTRANT -D_POSIX_PTHREAD_SEMANTICS \
 	-D_FILE_OFFSET_BITS=64 -D_LARGEFILE64_SOURCE \
 	-DTEXT_DOMAIN=\"zfs-linux-user\"
--- a/cmd/zfs/Makefile.in
+++ b/cmd/zfs/Makefile.in
@ -73,6 +73,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/user-ioctl.m4 \
 	$(top_srcdir)/config/user-libblkid.m4 \
 	$(top_srcdir)/config/user-libuuid.m4 \
+	$(top_srcdir)/config/user-no-unused-but-set-variable.m4 \
 	$(top_srcdir)/config/user-nptl_guard_within_stack.m4 \
 	$(top_srcdir)/config/user-selinux.m4 \
 	$(top_srcdir)/config/user-zlib.m4 $(top_srcdir)/config/user.m4 \
@ -203,6 +204,7 @@ MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
 NM = @NM@
 NMEDIT = @NMEDIT@
+NO_UNUSED_BUT_SET_VARIABLE = @NO_UNUSED_BUT_SET_VARIABLE@
 OBJDUMP = @OBJDUMP@
 OBJEXT = @OBJEXT@
 OTOOL = @OTOOL@
@ -302,7 +304,7 @@ DEFAULT_INCLUDES = -include ${top_builddir}/zfs_config.h \
 	-I$(top_srcdir)/include -I$(top_srcdir)/lib/libspl/include
 AM_LIBTOOLFLAGS = --silent
 AM_CFLAGS = -Wall -Wstrict-prototypes -fno-strict-aliasing \
-	-Wno-unused-but-set-variable ${DEBUG_CFLAGS} -D_GNU_SOURCE \
+	${NO_UNUSED_BUT_SET_VARIABLE} ${DEBUG_CFLAGS} -D_GNU_SOURCE \
 	-D__EXTENSIONS__ -D_REENTRANT -D_POSIX_PTHREAD_SEMANTICS \
 	-D_FILE_OFFSET_BITS=64 -D_LARGEFILE64_SOURCE \
 	-DTEXT_DOMAIN=\"zfs-linux-user\"
--- a/cmd/zinject/Makefile.in
+++ b/cmd/zinject/Makefile.in
@ -73,6 +73,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/user-ioctl.m4 \
 	$(top_srcdir)/config/user-libblkid.m4 \
 	$(top_srcdir)/config/user-libuuid.m4 \
+	$(top_srcdir)/config/user-no-unused-but-set-variable.m4 \
 	$(top_srcdir)/config/user-nptl_guard_within_stack.m4 \
 	$(top_srcdir)/config/user-selinux.m4 \
 	$(top_srcdir)/config/user-zlib.m4 $(top_srcdir)/config/user.m4 \
@ -203,6 +204,7 @@ MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
 NM = @NM@
 NMEDIT = @NMEDIT@
+NO_UNUSED_BUT_SET_VARIABLE = @NO_UNUSED_BUT_SET_VARIABLE@
 OBJDUMP = @OBJDUMP@
 OBJEXT = @OBJEXT@
 OTOOL = @OTOOL@
@ -302,7 +304,7 @@ DEFAULT_INCLUDES = -include ${top_builddir}/zfs_config.h \
 	-I$(top_srcdir)/include -I$(top_srcdir)/lib/libspl/include
 AM_LIBTOOLFLAGS = --silent
 AM_CFLAGS = -Wall -Wstrict-prototypes -fno-strict-aliasing \
-	-Wno-unused-but-set-variable ${DEBUG_CFLAGS} -D_GNU_SOURCE \
+	${NO_UNUSED_BUT_SET_VARIABLE} ${DEBUG_CFLAGS} -D_GNU_SOURCE \
 	-D__EXTENSIONS__ -D_REENTRANT -D_POSIX_PTHREAD_SEMANTICS \
 	-D_FILE_OFFSET_BITS=64 -D_LARGEFILE64_SOURCE \
 	-DTEXT_DOMAIN=\"zfs-linux-user\"
--- a/cmd/zpios/Makefile.in
+++ b/cmd/zpios/Makefile.in
@ -73,6 +73,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/user-ioctl.m4 \
 	$(top_srcdir)/config/user-libblkid.m4 \
 	$(top_srcdir)/config/user-libuuid.m4 \
+	$(top_srcdir)/config/user-no-unused-but-set-variable.m4 \
 	$(top_srcdir)/config/user-nptl_guard_within_stack.m4 \
 	$(top_srcdir)/config/user-selinux.m4 \
 	$(top_srcdir)/config/user-zlib.m4 $(top_srcdir)/config/user.m4 \
@ -193,6 +194,7 @@ MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
 NM = @NM@
 NMEDIT = @NMEDIT@
+NO_UNUSED_BUT_SET_VARIABLE = @NO_UNUSED_BUT_SET_VARIABLE@
 OBJDUMP = @OBJDUMP@
 OBJEXT = @OBJEXT@
 OTOOL = @OTOOL@
@ -292,7 +294,7 @@ DEFAULT_INCLUDES = -include ${top_builddir}/zfs_config.h \
 	-I$(top_srcdir)/include
 AM_LIBTOOLFLAGS = --silent
 AM_CFLAGS = -Wall -Wstrict-prototypes -fno-strict-aliasing \
-	-Wno-unused-but-set-variable ${DEBUG_CFLAGS} -D_GNU_SOURCE \
+	${NO_UNUSED_BUT_SET_VARIABLE} ${DEBUG_CFLAGS} -D_GNU_SOURCE \
 	-D__EXTENSIONS__ -D_REENTRANT -D_POSIX_PTHREAD_SEMANTICS \
 	-D_FILE_OFFSET_BITS=64 -D_LARGEFILE64_SOURCE \
 	-DTEXT_DOMAIN=\"zfs-linux-user\"
--- a/cmd/zpool/Makefile.in
+++ b/cmd/zpool/Makefile.in
@ -73,6 +73,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/user-ioctl.m4 \
 	$(top_srcdir)/config/user-libblkid.m4 \
 	$(top_srcdir)/config/user-libuuid.m4 \
+	$(top_srcdir)/config/user-no-unused-but-set-variable.m4 \
 	$(top_srcdir)/config/user-nptl_guard_within_stack.m4 \
 	$(top_srcdir)/config/user-selinux.m4 \
 	$(top_srcdir)/config/user-zlib.m4 $(top_srcdir)/config/user.m4 \
@ -204,6 +205,7 @@ MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
 NM = @NM@
 NMEDIT = @NMEDIT@
+NO_UNUSED_BUT_SET_VARIABLE = @NO_UNUSED_BUT_SET_VARIABLE@
 OBJDUMP = @OBJDUMP@
 OBJEXT = @OBJEXT@
 OTOOL = @OTOOL@
@ -303,7 +305,7 @@ DEFAULT_INCLUDES = -include ${top_builddir}/zfs_config.h \
 	-I$(top_srcdir)/include -I$(top_srcdir)/lib/libspl/include
 AM_LIBTOOLFLAGS = --silent
 AM_CFLAGS = -Wall -Wstrict-prototypes -fno-strict-aliasing \
-	-Wno-unused-but-set-variable ${DEBUG_CFLAGS} -D_GNU_SOURCE \
+	${NO_UNUSED_BUT_SET_VARIABLE} ${DEBUG_CFLAGS} -D_GNU_SOURCE \
 	-D__EXTENSIONS__ -D_REENTRANT -D_POSIX_PTHREAD_SEMANTICS \
 	-D_FILE_OFFSET_BITS=64 -D_LARGEFILE64_SOURCE \
 	-DTEXT_DOMAIN=\"zfs-linux-user\"
--- a/cmd/zpool_id/Makefile.in
+++ b/cmd/zpool_id/Makefile.in
@ -72,6 +72,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/user-ioctl.m4 \
 	$(top_srcdir)/config/user-libblkid.m4 \
 	$(top_srcdir)/config/user-libuuid.m4 \
+	$(top_srcdir)/config/user-no-unused-but-set-variable.m4 \
 	$(top_srcdir)/config/user-nptl_guard_within_stack.m4 \
 	$(top_srcdir)/config/user-selinux.m4 \
 	$(top_srcdir)/config/user-zlib.m4 $(top_srcdir)/config/user.m4 \
@ -186,6 +187,7 @@ MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
 NM = @NM@
 NMEDIT = @NMEDIT@
+NO_UNUSED_BUT_SET_VARIABLE = @NO_UNUSED_BUT_SET_VARIABLE@
 OBJDUMP = @OBJDUMP@
 OBJEXT = @OBJEXT@
 OTOOL = @OTOOL@
--- a/cmd/zpool_layout/Makefile.in
+++ b/cmd/zpool_layout/Makefile.in
@ -72,6 +72,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/user-ioctl.m4 \
 	$(top_srcdir)/config/user-libblkid.m4 \
 	$(top_srcdir)/config/user-libuuid.m4 \
+	$(top_srcdir)/config/user-no-unused-but-set-variable.m4 \
 	$(top_srcdir)/config/user-nptl_guard_within_stack.m4 \
 	$(top_srcdir)/config/user-selinux.m4 \
 	$(top_srcdir)/config/user-zlib.m4 $(top_srcdir)/config/user.m4 \
@ -186,6 +187,7 @@ MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
 NM = @NM@
 NMEDIT = @NMEDIT@
+NO_UNUSED_BUT_SET_VARIABLE = @NO_UNUSED_BUT_SET_VARIABLE@
 OBJDUMP = @OBJDUMP@
 OBJEXT = @OBJEXT@
 OTOOL = @OTOOL@
--- a/cmd/ztest/Makefile.in
+++ b/cmd/ztest/Makefile.in
@ -73,6 +73,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/user-ioctl.m4 \
 	$(top_srcdir)/config/user-libblkid.m4 \
 	$(top_srcdir)/config/user-libuuid.m4 \
+	$(top_srcdir)/config/user-no-unused-but-set-variable.m4 \
 	$(top_srcdir)/config/user-nptl_guard_within_stack.m4 \
 	$(top_srcdir)/config/user-selinux.m4 \
 	$(top_srcdir)/config/user-zlib.m4 $(top_srcdir)/config/user.m4 \
@ -203,6 +204,7 @@ MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
 NM = @NM@
 NMEDIT = @NMEDIT@
+NO_UNUSED_BUT_SET_VARIABLE = @NO_UNUSED_BUT_SET_VARIABLE@
 OBJDUMP = @OBJDUMP@
 OBJEXT = @OBJEXT@
 OTOOL = @OTOOL@
@ -302,7 +304,7 @@ DEFAULT_INCLUDES = -include ${top_builddir}/zfs_config.h \
 	-I$(top_srcdir)/include -I$(top_srcdir)/lib/libspl/include
 AM_LIBTOOLFLAGS = --silent
 AM_CFLAGS = -Wall -Wstrict-prototypes -fno-strict-aliasing \
-	-Wno-unused-but-set-variable ${DEBUG_CFLAGS} -D_GNU_SOURCE \
+	${NO_UNUSED_BUT_SET_VARIABLE} ${DEBUG_CFLAGS} -D_GNU_SOURCE \
 	-D__EXTENSIONS__ -D_REENTRANT -D_POSIX_PTHREAD_SEMANTICS \
 	-D_FILE_OFFSET_BITS=64 -D_LARGEFILE64_SOURCE \
 	-DTEXT_DOMAIN=\"zfs-linux-user\" $(DEBUG_STACKFLAGS) \
--- a/cmd/zvol_id/Makefile.in
+++ b/cmd/zvol_id/Makefile.in
@ -73,6 +73,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/user-ioctl.m4 \
 	$(top_srcdir)/config/user-libblkid.m4 \
 	$(top_srcdir)/config/user-libuuid.m4 \
+	$(top_srcdir)/config/user-no-unused-but-set-variable.m4 \
 	$(top_srcdir)/config/user-nptl_guard_within_stack.m4 \
 	$(top_srcdir)/config/user-selinux.m4 \
 	$(top_srcdir)/config/user-zlib.m4 $(top_srcdir)/config/user.m4 \
@ -193,6 +194,7 @@ MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
 NM = @NM@
 NMEDIT = @NMEDIT@
+NO_UNUSED_BUT_SET_VARIABLE = @NO_UNUSED_BUT_SET_VARIABLE@
 OBJDUMP = @OBJDUMP@
 OBJEXT = @OBJEXT@
 OTOOL = @OTOOL@
@ -292,7 +294,7 @@ DEFAULT_INCLUDES = -include ${top_builddir}/zfs_config.h \
 	-I$(top_srcdir)/include -I$(top_srcdir)/lib/libspl/include
 AM_LIBTOOLFLAGS = --silent
 AM_CFLAGS = -Wall -Wstrict-prototypes -fno-strict-aliasing \
-	-Wno-unused-but-set-variable ${DEBUG_CFLAGS} -D_GNU_SOURCE \
+	${NO_UNUSED_BUT_SET_VARIABLE} ${DEBUG_CFLAGS} -D_GNU_SOURCE \
 	-D__EXTENSIONS__ -D_REENTRANT -D_POSIX_PTHREAD_SEMANTICS \
 	-D_FILE_OFFSET_BITS=64 -D_LARGEFILE64_SOURCE \
 	-DTEXT_DOMAIN=\"zfs-linux-user\"
--- a/config/Rules.am
+++ b/config/Rules.am
@ -2,7 +2,7 @@ DEFAULT_INCLUDES = -include ${top_builddir}/zfs_config.h

 AM_LIBTOOLFLAGS = --silent
 AM_CFLAGS  = -Wall -Wstrict-prototypes
-AM_CFLAGS += -fno-strict-aliasing -Wno-unused-but-set-variable ${DEBUG_CFLAGS}
+AM_CFLAGS += -fno-strict-aliasing ${NO_UNUSED_BUT_SET_VARIABLE} ${DEBUG_CFLAGS}
 AM_CFLAGS += -D_GNU_SOURCE -D__EXTENSIONS__ -D_REENTRANT
 AM_CFLAGS += -D_POSIX_PTHREAD_SEMANTICS -D_FILE_OFFSET_BITS=64
 AM_CFLAGS += -D_LARGEFILE64_SOURCE -DTEXT_DOMAIN=\"zfs-linux-user\"
--- a/config/kernel.m4
+++ b/config/kernel.m4
@ -46,7 +46,7 @@ AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [

 	dnl # -Wall -fno-strict-aliasing -Wstrict-prototypes and other
 	dnl # compiler options are added by the kernel build system.
-	KERNELCPPFLAGS="$KERNELCPPFLAGS -Wno-unused-but-set-variable"
+	KERNELCPPFLAGS="$KERNELCPPFLAGS $NO_UNUSED_BUT_SET_VARIABLE"
 	KERNELCPPFLAGS="$KERNELCPPFLAGS -DHAVE_SPL -D_KERNEL"
 	KERNELCPPFLAGS="$KERNELCPPFLAGS -DTEXT_DOMAIN=\\\"zfs-linux-kernel\\\""

--- a/config/user-no-unused-but-set-variable.m4
+++ b/config/user-no-unused-but-set-variable.m4
@ -0,0 +1,27 @@
+dnl #
+dnl # Check if gcc supports -Wno-unused-but-set-variable option.
+dnl #
+dnl # We actually invoke gcc with the -Wunused-but-set-variable option
+dnl # and infer the 'no-' version does or doesn't exist based upon
+dnl # the results.  This is required because when checking any of
+dnl # no- prefixed options gcc always returns success.
+dnl #
+AC_DEFUN([ZFS_AC_CONFIG_USER_NO_UNUSED_BUT_SET_VARIABLE], [
+	AC_MSG_CHECKING([for -Wno-unused-but-set-variable support])
+
+	saved_flags="$CFLAGS"
+	CFLAGS="$CFLAGS -Wunused-but-set-variable"
+
+	AC_RUN_IFELSE(AC_LANG_PROGRAM( [], []),
+	[
+		NO_UNUSED_BUT_SET_VARIABLE=-Wno-unused-but-set-variable
+		AC_MSG_RESULT([yes])
+	],
+	[
+		NO_UNUSED_BUT_SET_VARIABLE=
+		AC_MSG_RESULT([no])
+	])
+
+	CFLAGS="$saved_flags"
+	AC_SUBST([NO_UNUSED_BUT_SET_VARIABLE])
+])
--- a/config/user.m4
+++ b/config/user.m4
@ -9,5 +9,6 @@ AC_DEFUN([ZFS_AC_CONFIG_USER], [
 	ZFS_AC_CONFIG_USER_LIBBLKID
 	ZFS_AC_CONFIG_USER_LIBSELINUX
 	ZFS_AC_CONFIG_USER_FRAME_LARGER_THAN
+	ZFS_AC_CONFIG_USER_NO_UNUSED_BUT_SET_VARIABLE
 	ZFS_AC_CONFIG_USER_STACK_GUARD
 ])
--- a/191
+++ b/191
@ -793,6 +793,7 @@ CONFIG_KERNEL_FALSE
 CONFIG_KERNEL_TRUE
 CONFIG_USER_FALSE
 CONFIG_USER_TRUE
+NO_UNUSED_BUT_SET_VARIABLE
 FRAME_LARGER_THAN
 LIBSELINUX
 LIBBLKID
@ -4821,13 +4822,13 @@ if test "${lt_cv_nm_interface+set}" = set; then
 else
  lt_cv_nm_interface="BSD nm"
  echo "int some_variable = 0;" > conftest.$ac_ext
-  (eval echo "\"\$as_me:4824: $ac_compile\"" >&5)
+  (eval echo "\"\$as_me:4825: $ac_compile\"" >&5)
  (eval "$ac_compile" 2>conftest.err)
  cat conftest.err >&5
-  (eval echo "\"\$as_me:4827: $NM \\\"conftest.$ac_objext\\\"\"" >&5)
+  (eval echo "\"\$as_me:4828: $NM \\\"conftest.$ac_objext\\\"\"" >&5)
  (eval "$NM \"conftest.$ac_objext\"" 2>conftest.err > conftest.out)
  cat conftest.err >&5
-  (eval echo "\"\$as_me:4830: output\"" >&5)
+  (eval echo "\"\$as_me:4831: output\"" >&5)
  cat conftest.out >&5
  if $GREP 'External.*some_variable' conftest.out > /dev/null; then
    lt_cv_nm_interface="MS dumpbin"
@ -6033,7 +6034,7 @@ ia64-*-hpux*)
  ;;
 *-*-irix6*)
  # Find out which ABI we are using.
-  echo '#line 6036 "configure"' > conftest.$ac_ext
+  echo '#line 6037 "configure"' > conftest.$ac_ext
  if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
  (eval $ac_compile) 2>&5
  ac_status=$?
@ -7886,11 +7887,11 @@ else
   -e 's:.*FLAGS}\{0,1\} :&$lt_compiler_flag :; t' \
   -e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
   -e 's:$: $lt_compiler_flag:'`
-   (eval echo "\"\$as_me:7889: $lt_compile\"" >&5)
+   (eval echo "\"\$as_me:7890: $lt_compile\"" >&5)
   (eval "$lt_compile" 2>conftest.err)
   ac_status=$?
   cat conftest.err >&5
-   echo "$as_me:7893: \$? = $ac_status" >&5
+   echo "$as_me:7894: \$? = $ac_status" >&5
   if (exit $ac_status) && test -s "$ac_outfile"; then
     # The compiler can only warn and ignore the option if not recognized
     # So say no if there are warnings other than the usual output.
@ -8225,11 +8226,11 @@ else
   -e 's:.*FLAGS}\{0,1\} :&$lt_compiler_flag :; t' \
   -e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
   -e 's:$: $lt_compiler_flag:'`
-   (eval echo "\"\$as_me:8228: $lt_compile\"" >&5)
+   (eval echo "\"\$as_me:8229: $lt_compile\"" >&5)
   (eval "$lt_compile" 2>conftest.err)
   ac_status=$?
   cat conftest.err >&5
-   echo "$as_me:8232: \$? = $ac_status" >&5
+   echo "$as_me:8233: \$? = $ac_status" >&5
   if (exit $ac_status) && test -s "$ac_outfile"; then
     # The compiler can only warn and ignore the option if not recognized
     # So say no if there are warnings other than the usual output.
@ -8330,11 +8331,11 @@ else
   -e 's:.*FLAGS}\{0,1\} :&$lt_compiler_flag :; t' \
   -e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
   -e 's:$: $lt_compiler_flag:'`
-   (eval echo "\"\$as_me:8333: $lt_compile\"" >&5)
+   (eval echo "\"\$as_me:8334: $lt_compile\"" >&5)
   (eval "$lt_compile" 2>out/conftest.err)
   ac_status=$?
   cat out/conftest.err >&5
-   echo "$as_me:8337: \$? = $ac_status" >&5
+   echo "$as_me:8338: \$? = $ac_status" >&5
   if (exit $ac_status) && test -s out/conftest2.$ac_objext
   then
     # The compiler can only warn and ignore the option if not recognized
@ -8385,11 +8386,11 @@ else
   -e 's:.*FLAGS}\{0,1\} :&$lt_compiler_flag :; t' \
   -e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
   -e 's:$: $lt_compiler_flag:'`
-   (eval echo "\"\$as_me:8388: $lt_compile\"" >&5)
+   (eval echo "\"\$as_me:8389: $lt_compile\"" >&5)
   (eval "$lt_compile" 2>out/conftest.err)
   ac_status=$?
   cat out/conftest.err >&5
-   echo "$as_me:8392: \$? = $ac_status" >&5
+   echo "$as_me:8393: \$? = $ac_status" >&5
   if (exit $ac_status) && test -s out/conftest2.$ac_objext
   then
     # The compiler can only warn and ignore the option if not recognized
@ -11188,7 +11189,7 @@ else
  lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
  lt_status=$lt_dlunknown
  cat > conftest.$ac_ext <<_LT_EOF
-#line 11191 "configure"
+#line 11192 "configure"
 #include "confdefs.h"

 #if HAVE_DLFCN_H
@ -11284,7 +11285,7 @@ else
  lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
  lt_status=$lt_dlunknown
  cat > conftest.$ac_ext <<_LT_EOF
-#line 11287 "configure"
+#line 11288 "configure"
 #include "confdefs.h"

 #if HAVE_DLFCN_H
@ -14450,7 +14451,7 @@ _ACEOF



-			KERNELCPPFLAGS="$KERNELCPPFLAGS -Wno-unused-but-set-variable"
+			KERNELCPPFLAGS="$KERNELCPPFLAGS $NO_UNUSED_BUT_SET_VARIABLE"
 	KERNELCPPFLAGS="$KERNELCPPFLAGS -DHAVE_SPL -D_KERNEL"
 	KERNELCPPFLAGS="$KERNELCPPFLAGS -DTEXT_DOMAIN=\\\"zfs-linux-kernel\\\""

@ -15875,6 +15876,85 @@ fi



+	{ $as_echo "$as_me:$LINENO: checking for -Wno-unused-but-set-variable support" >&5
+$as_echo_n "checking for -Wno-unused-but-set-variable support... " >&6; }
+
+	saved_flags="$CFLAGS"
+	CFLAGS="$CFLAGS -Wunused-but-set-variable"
+
+	if test "$cross_compiling" = yes; then
+  { { $as_echo "$as_me:$LINENO: error: in \`$ac_pwd':" >&5
+$as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
+{ { $as_echo "$as_me:$LINENO: error: cannot run test program while cross compiling
+See \`config.log' for more details." >&5
+$as_echo "$as_me: error: cannot run test program while cross compiling
+See \`config.log' for more details." >&2;}
+   { (exit 1); exit 1; }; }; }
+else
+  cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+
+int
+main ()
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+rm -f conftest$ac_exeext
+if { (ac_try="$ac_link"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval ac_try_echo="\"\$as_me:$LINENO: $ac_try_echo\""
+$as_echo "$ac_try_echo") >&5
+  (eval "$ac_link") 2>&5
+  ac_status=$?
+  $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } && { ac_try='./conftest$ac_exeext'
+  { (case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval ac_try_echo="\"\$as_me:$LINENO: $ac_try_echo\""
+$as_echo "$ac_try_echo") >&5
+  (eval "$ac_try") 2>&5
+  ac_status=$?
+  $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+
+		NO_UNUSED_BUT_SET_VARIABLE=-Wno-unused-but-set-variable
+		{ $as_echo "$as_me:$LINENO: result: yes" >&5
+$as_echo "yes" >&6; }
+
+else
+  $as_echo "$as_me: program exited with status $ac_status" >&5
+$as_echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+( exit $ac_status )
+
+		NO_UNUSED_BUT_SET_VARIABLE=
+		{ $as_echo "$as_me:$LINENO: result: no" >&5
+$as_echo "no" >&6; }
+
+fi
+rm -rf conftest.dSYM
+rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext conftest.$ac_objext conftest.$ac_ext
+fi
+
+
+
+	CFLAGS="$saved_flags"
+
+
+

 	{ $as_echo "$as_me:$LINENO: checking whether pthread stack includes guard" >&5
 $as_echo_n "checking whether pthread stack includes guard... " >&6; }
@ -18576,7 +18656,7 @@ _ACEOF



-			KERNELCPPFLAGS="$KERNELCPPFLAGS -Wno-unused-but-set-variable"
+			KERNELCPPFLAGS="$KERNELCPPFLAGS $NO_UNUSED_BUT_SET_VARIABLE"
 	KERNELCPPFLAGS="$KERNELCPPFLAGS -DHAVE_SPL -D_KERNEL"
 	KERNELCPPFLAGS="$KERNELCPPFLAGS -DTEXT_DOMAIN=\\\"zfs-linux-kernel\\\""

@ -20001,6 +20081,85 @@ fi



+	{ $as_echo "$as_me:$LINENO: checking for -Wno-unused-but-set-variable support" >&5
+$as_echo_n "checking for -Wno-unused-but-set-variable support... " >&6; }
+
+	saved_flags="$CFLAGS"
+	CFLAGS="$CFLAGS -Wunused-but-set-variable"
+
+	if test "$cross_compiling" = yes; then
+  { { $as_echo "$as_me:$LINENO: error: in \`$ac_pwd':" >&5
+$as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
+{ { $as_echo "$as_me:$LINENO: error: cannot run test program while cross compiling
+See \`config.log' for more details." >&5
+$as_echo "$as_me: error: cannot run test program while cross compiling
+See \`config.log' for more details." >&2;}
+   { (exit 1); exit 1; }; }; }
+else
+  cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+
+int
+main ()
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+rm -f conftest$ac_exeext
+if { (ac_try="$ac_link"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval ac_try_echo="\"\$as_me:$LINENO: $ac_try_echo\""
+$as_echo "$ac_try_echo") >&5
+  (eval "$ac_link") 2>&5
+  ac_status=$?
+  $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } && { ac_try='./conftest$ac_exeext'
+  { (case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval ac_try_echo="\"\$as_me:$LINENO: $ac_try_echo\""
+$as_echo "$ac_try_echo") >&5
+  (eval "$ac_try") 2>&5
+  ac_status=$?
+  $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+
+		NO_UNUSED_BUT_SET_VARIABLE=-Wno-unused-but-set-variable
+		{ $as_echo "$as_me:$LINENO: result: yes" >&5
+$as_echo "yes" >&6; }
+
+else
+  $as_echo "$as_me: program exited with status $ac_status" >&5
+$as_echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+( exit $ac_status )
+
+		NO_UNUSED_BUT_SET_VARIABLE=
+		{ $as_echo "$as_me:$LINENO: result: no" >&5
+$as_echo "no" >&6; }
+
+fi
+rm -rf conftest.dSYM
+rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext conftest.$ac_objext conftest.$ac_ext
+fi
+
+
+
+	CFLAGS="$saved_flags"
+
+
+

 	{ $as_echo "$as_me:$LINENO: checking whether pthread stack includes guard" >&5
 $as_echo_n "checking whether pthread stack includes guard... " >&6; }
--- a/dracut/90zfs/Makefile.in
+++ b/dracut/90zfs/Makefile.in
@ -72,6 +72,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/user-ioctl.m4 \
 	$(top_srcdir)/config/user-libblkid.m4 \
 	$(top_srcdir)/config/user-libuuid.m4 \
+	$(top_srcdir)/config/user-no-unused-but-set-variable.m4 \
 	$(top_srcdir)/config/user-nptl_guard_within_stack.m4 \
 	$(top_srcdir)/config/user-selinux.m4 \
 	$(top_srcdir)/config/user-zlib.m4 $(top_srcdir)/config/user.m4 \
@ -186,6 +187,7 @@ MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
 NM = @NM@
 NMEDIT = @NMEDIT@
+NO_UNUSED_BUT_SET_VARIABLE = @NO_UNUSED_BUT_SET_VARIABLE@
 OBJDUMP = @OBJDUMP@
 OBJEXT = @OBJEXT@
 OTOOL = @OTOOL@
--- a/dracut/Makefile.in
+++ b/dracut/Makefile.in
@ -70,6 +70,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/user-ioctl.m4 \
 	$(top_srcdir)/config/user-libblkid.m4 \
 	$(top_srcdir)/config/user-libuuid.m4 \
+	$(top_srcdir)/config/user-no-unused-but-set-variable.m4 \
 	$(top_srcdir)/config/user-nptl_guard_within_stack.m4 \
 	$(top_srcdir)/config/user-selinux.m4 \
 	$(top_srcdir)/config/user-zlib.m4 $(top_srcdir)/config/user.m4 \
@ -201,6 +202,7 @@ MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
 NM = @NM@
 NMEDIT = @NMEDIT@
+NO_UNUSED_BUT_SET_VARIABLE = @NO_UNUSED_BUT_SET_VARIABLE@
 OBJDUMP = @OBJDUMP@
 OBJEXT = @OBJEXT@
 OTOOL = @OTOOL@
--- a/etc/Makefile.in
+++ b/etc/Makefile.in
@ -70,6 +70,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/user-ioctl.m4 \
 	$(top_srcdir)/config/user-libblkid.m4 \
 	$(top_srcdir)/config/user-libuuid.m4 \
+	$(top_srcdir)/config/user-no-unused-but-set-variable.m4 \
 	$(top_srcdir)/config/user-nptl_guard_within_stack.m4 \
 	$(top_srcdir)/config/user-selinux.m4 \
 	$(top_srcdir)/config/user-zlib.m4 $(top_srcdir)/config/user.m4 \
@ -201,6 +202,7 @@ MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
 NM = @NM@
 NMEDIT = @NMEDIT@
+NO_UNUSED_BUT_SET_VARIABLE = @NO_UNUSED_BUT_SET_VARIABLE@
 OBJDUMP = @OBJDUMP@
 OBJEXT = @OBJEXT@
 OTOOL = @OTOOL@
--- a/etc/init.d/Makefile.in
+++ b/etc/init.d/Makefile.in
@ -70,6 +70,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/user-ioctl.m4 \
 	$(top_srcdir)/config/user-libblkid.m4 \
 	$(top_srcdir)/config/user-libuuid.m4 \
+	$(top_srcdir)/config/user-no-unused-but-set-variable.m4 \
 	$(top_srcdir)/config/user-nptl_guard_within_stack.m4 \
 	$(top_srcdir)/config/user-selinux.m4 \
 	$(top_srcdir)/config/user-zlib.m4 $(top_srcdir)/config/user.m4 \
@ -161,6 +162,7 @@ MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
 NM = @NM@
 NMEDIT = @NMEDIT@
+NO_UNUSED_BUT_SET_VARIABLE = @NO_UNUSED_BUT_SET_VARIABLE@
 OBJDUMP = @OBJDUMP@
 OBJEXT = @OBJEXT@
 OTOOL = @OTOOL@
--- a/etc/udev/Makefile.in
+++ b/etc/udev/Makefile.in
@ -70,6 +70,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/user-ioctl.m4 \
 	$(top_srcdir)/config/user-libblkid.m4 \
 	$(top_srcdir)/config/user-libuuid.m4 \
+	$(top_srcdir)/config/user-no-unused-but-set-variable.m4 \
 	$(top_srcdir)/config/user-nptl_guard_within_stack.m4 \
 	$(top_srcdir)/config/user-selinux.m4 \
 	$(top_srcdir)/config/user-zlib.m4 $(top_srcdir)/config/user.m4 \
@ -201,6 +202,7 @@ MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
 NM = @NM@
 NMEDIT = @NMEDIT@
+NO_UNUSED_BUT_SET_VARIABLE = @NO_UNUSED_BUT_SET_VARIABLE@
 OBJDUMP = @OBJDUMP@
 OBJEXT = @OBJEXT@
 OTOOL = @OTOOL@
--- a/etc/udev/rules.d/Makefile.in
+++ b/etc/udev/rules.d/Makefile.in
@ -72,6 +72,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/user-ioctl.m4 \
 	$(top_srcdir)/config/user-libblkid.m4 \
 	$(top_srcdir)/config/user-libuuid.m4 \
+	$(top_srcdir)/config/user-no-unused-but-set-variable.m4 \
 	$(top_srcdir)/config/user-nptl_guard_within_stack.m4 \
 	$(top_srcdir)/config/user-selinux.m4 \
 	$(top_srcdir)/config/user-zlib.m4 $(top_srcdir)/config/user.m4 \
@ -186,6 +187,7 @@ MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
 NM = @NM@
 NMEDIT = @NMEDIT@
+NO_UNUSED_BUT_SET_VARIABLE = @NO_UNUSED_BUT_SET_VARIABLE@
 OBJDUMP = @OBJDUMP@
 OBJEXT = @OBJEXT@
 OTOOL = @OTOOL@
--- a/etc/zfs/Makefile.in
+++ b/etc/zfs/Makefile.in
@ -71,6 +71,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/user-ioctl.m4 \
 	$(top_srcdir)/config/user-libblkid.m4 \
 	$(top_srcdir)/config/user-libuuid.m4 \
+	$(top_srcdir)/config/user-no-unused-but-set-variable.m4 \
 	$(top_srcdir)/config/user-nptl_guard_within_stack.m4 \
 	$(top_srcdir)/config/user-selinux.m4 \
 	$(top_srcdir)/config/user-zlib.m4 $(top_srcdir)/config/user.m4 \
@ -185,6 +186,7 @@ MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
 NM = @NM@
 NMEDIT = @NMEDIT@
+NO_UNUSED_BUT_SET_VARIABLE = @NO_UNUSED_BUT_SET_VARIABLE@
 OBJDUMP = @OBJDUMP@
 OBJEXT = @OBJEXT@
 OTOOL = @OTOOL@
--- a/include/Makefile.in
+++ b/include/Makefile.in
@ -72,6 +72,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/user-ioctl.m4 \
 	$(top_srcdir)/config/user-libblkid.m4 \
 	$(top_srcdir)/config/user-libuuid.m4 \
+	$(top_srcdir)/config/user-no-unused-but-set-variable.m4 \
 	$(top_srcdir)/config/user-nptl_guard_within_stack.m4 \
 	$(top_srcdir)/config/user-selinux.m4 \
 	$(top_srcdir)/config/user-zlib.m4 $(top_srcdir)/config/user.m4 \
@ -245,6 +246,7 @@ MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
 NM = @NM@
 NMEDIT = @NMEDIT@
+NO_UNUSED_BUT_SET_VARIABLE = @NO_UNUSED_BUT_SET_VARIABLE@
 OBJDUMP = @OBJDUMP@
 OBJEXT = @OBJEXT@
 OTOOL = @OTOOL@
--- a/include/linux/Makefile.in
+++ b/include/linux/Makefile.in
@ -72,6 +72,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/user-ioctl.m4 \
 	$(top_srcdir)/config/user-libblkid.m4 \
 	$(top_srcdir)/config/user-libuuid.m4 \
+	$(top_srcdir)/config/user-no-unused-but-set-variable.m4 \
 	$(top_srcdir)/config/user-nptl_guard_within_stack.m4 \
 	$(top_srcdir)/config/user-selinux.m4 \
 	$(top_srcdir)/config/user-zlib.m4 $(top_srcdir)/config/user.m4 \
@ -192,6 +193,7 @@ MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
 NM = @NM@
 NMEDIT = @NMEDIT@
+NO_UNUSED_BUT_SET_VARIABLE = @NO_UNUSED_BUT_SET_VARIABLE@
 OBJDUMP = @OBJDUMP@
 OBJEXT = @OBJEXT@
 OTOOL = @OTOOL@
--- a/include/sys/Makefile.in
+++ b/include/sys/Makefile.in
@ -72,6 +72,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/user-ioctl.m4 \
 	$(top_srcdir)/config/user-libblkid.m4 \
 	$(top_srcdir)/config/user-libuuid.m4 \
+	$(top_srcdir)/config/user-no-unused-but-set-variable.m4 \
 	$(top_srcdir)/config/user-nptl_guard_within_stack.m4 \
 	$(top_srcdir)/config/user-selinux.m4 \
 	$(top_srcdir)/config/user-zlib.m4 $(top_srcdir)/config/user.m4 \
@ -370,6 +371,7 @@ MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
 NM = @NM@
 NMEDIT = @NMEDIT@
+NO_UNUSED_BUT_SET_VARIABLE = @NO_UNUSED_BUT_SET_VARIABLE@
 OBJDUMP = @OBJDUMP@
 OBJEXT = @OBJEXT@
 OTOOL = @OTOOL@
--- a/include/sys/fm/Makefile.in
+++ b/include/sys/fm/Makefile.in
@ -72,6 +72,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/user-ioctl.m4 \
 	$(top_srcdir)/config/user-libblkid.m4 \
 	$(top_srcdir)/config/user-libuuid.m4 \
+	$(top_srcdir)/config/user-no-unused-but-set-variable.m4 \
 	$(top_srcdir)/config/user-nptl_guard_within_stack.m4 \
 	$(top_srcdir)/config/user-selinux.m4 \
 	$(top_srcdir)/config/user-zlib.m4 $(top_srcdir)/config/user.m4 \
@ -230,6 +231,7 @@ MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
 NM = @NM@
 NMEDIT = @NMEDIT@
+NO_UNUSED_BUT_SET_VARIABLE = @NO_UNUSED_BUT_SET_VARIABLE@
 OBJDUMP = @OBJDUMP@
 OBJEXT = @OBJEXT@
 OTOOL = @OTOOL@
--- a/include/sys/fm/fs/Makefile.in
+++ b/include/sys/fm/fs/Makefile.in
@ -72,6 +72,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/user-ioctl.m4 \
 	$(top_srcdir)/config/user-libblkid.m4 \
 	$(top_srcdir)/config/user-libuuid.m4 \
+	$(top_srcdir)/config/user-no-unused-but-set-variable.m4 \
 	$(top_srcdir)/config/user-nptl_guard_within_stack.m4 \
 	$(top_srcdir)/config/user-selinux.m4 \
 	$(top_srcdir)/config/user-zlib.m4 $(top_srcdir)/config/user.m4 \
@ -190,6 +191,7 @@ MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
 NM = @NM@
 NMEDIT = @NMEDIT@
+NO_UNUSED_BUT_SET_VARIABLE = @NO_UNUSED_BUT_SET_VARIABLE@
 OBJDUMP = @OBJDUMP@
 OBJEXT = @OBJEXT@
 OTOOL = @OTOOL@
--- a/include/sys/fs/Makefile.in
+++ b/include/sys/fs/Makefile.in
@ -72,6 +72,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/user-ioctl.m4 \
 	$(top_srcdir)/config/user-libblkid.m4 \
 	$(top_srcdir)/config/user-libuuid.m4 \
+	$(top_srcdir)/config/user-no-unused-but-set-variable.m4 \
 	$(top_srcdir)/config/user-nptl_guard_within_stack.m4 \
 	$(top_srcdir)/config/user-selinux.m4 \
 	$(top_srcdir)/config/user-zlib.m4 $(top_srcdir)/config/user.m4 \
@ -190,6 +191,7 @@ MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
 NM = @NM@
 NMEDIT = @NMEDIT@
+NO_UNUSED_BUT_SET_VARIABLE = @NO_UNUSED_BUT_SET_VARIABLE@
 OBJDUMP = @OBJDUMP@
 OBJEXT = @OBJEXT@
 OTOOL = @OTOOL@
--- a/lib/Makefile.in
+++ b/lib/Makefile.in
@ -70,6 +70,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/user-ioctl.m4 \
 	$(top_srcdir)/config/user-libblkid.m4 \
 	$(top_srcdir)/config/user-libuuid.m4 \
+	$(top_srcdir)/config/user-no-unused-but-set-variable.m4 \
 	$(top_srcdir)/config/user-nptl_guard_within_stack.m4 \
 	$(top_srcdir)/config/user-selinux.m4 \
 	$(top_srcdir)/config/user-zlib.m4 $(top_srcdir)/config/user.m4 \
@ -201,6 +202,7 @@ MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
 NM = @NM@
 NMEDIT = @NMEDIT@
+NO_UNUSED_BUT_SET_VARIABLE = @NO_UNUSED_BUT_SET_VARIABLE@
 OBJDUMP = @OBJDUMP@
 OBJEXT = @OBJEXT@
 OTOOL = @OTOOL@
--- a/lib/libavl/Makefile.in
+++ b/lib/libavl/Makefile.in
@ -72,6 +72,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/user-ioctl.m4 \
 	$(top_srcdir)/config/user-libblkid.m4 \
 	$(top_srcdir)/config/user-libuuid.m4 \
+	$(top_srcdir)/config/user-no-unused-but-set-variable.m4 \
 	$(top_srcdir)/config/user-nptl_guard_within_stack.m4 \
 	$(top_srcdir)/config/user-selinux.m4 \
 	$(top_srcdir)/config/user-zlib.m4 $(top_srcdir)/config/user.m4 \
@ -213,6 +214,7 @@ MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
 NM = @NM@
 NMEDIT = @NMEDIT@
+NO_UNUSED_BUT_SET_VARIABLE = @NO_UNUSED_BUT_SET_VARIABLE@
 OBJDUMP = @OBJDUMP@
 OBJEXT = @OBJEXT@
 OTOOL = @OTOOL@
@ -312,7 +314,7 @@ DEFAULT_INCLUDES = -include ${top_builddir}/zfs_config.h \
 	-I$(top_srcdir)/include -I$(top_srcdir)/lib/libspl/include
 AM_LIBTOOLFLAGS = --silent
 AM_CFLAGS = -Wall -Wstrict-prototypes -fno-strict-aliasing \
-	-Wno-unused-but-set-variable ${DEBUG_CFLAGS} -D_GNU_SOURCE \
+	${NO_UNUSED_BUT_SET_VARIABLE} ${DEBUG_CFLAGS} -D_GNU_SOURCE \
 	-D__EXTENSIONS__ -D_REENTRANT -D_POSIX_PTHREAD_SEMANTICS \
 	-D_FILE_OFFSET_BITS=64 -D_LARGEFILE64_SOURCE \
 	-DTEXT_DOMAIN=\"zfs-linux-user\" $(DEBUG_STACKFLAGS) \
--- a/lib/libefi/Makefile.in
+++ b/lib/libefi/Makefile.in
@ -72,6 +72,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/user-ioctl.m4 \
 	$(top_srcdir)/config/user-libblkid.m4 \
 	$(top_srcdir)/config/user-libuuid.m4 \
+	$(top_srcdir)/config/user-no-unused-but-set-variable.m4 \
 	$(top_srcdir)/config/user-nptl_guard_within_stack.m4 \
 	$(top_srcdir)/config/user-selinux.m4 \
 	$(top_srcdir)/config/user-zlib.m4 $(top_srcdir)/config/user.m4 \
@ -213,6 +214,7 @@ MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
 NM = @NM@
 NMEDIT = @NMEDIT@
+NO_UNUSED_BUT_SET_VARIABLE = @NO_UNUSED_BUT_SET_VARIABLE@
 OBJDUMP = @OBJDUMP@
 OBJEXT = @OBJEXT@
 OTOOL = @OTOOL@
@ -312,7 +314,7 @@ DEFAULT_INCLUDES = -include ${top_builddir}/zfs_config.h \
 	-I$(top_srcdir)/include -I$(top_srcdir)/lib/libspl/include
 AM_LIBTOOLFLAGS = --silent
 AM_CFLAGS = -Wall -Wstrict-prototypes -fno-strict-aliasing \
-	-Wno-unused-but-set-variable ${DEBUG_CFLAGS} -D_GNU_SOURCE \
+	${NO_UNUSED_BUT_SET_VARIABLE} ${DEBUG_CFLAGS} -D_GNU_SOURCE \
 	-D__EXTENSIONS__ -D_REENTRANT -D_POSIX_PTHREAD_SEMANTICS \
 	-D_FILE_OFFSET_BITS=64 -D_LARGEFILE64_SOURCE \
 	-DTEXT_DOMAIN=\"zfs-linux-user\" $(DEBUG_STACKFLAGS) \
--- a/lib/libnvpair/Makefile.in
+++ b/lib/libnvpair/Makefile.in
@ -72,6 +72,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/user-ioctl.m4 \
 	$(top_srcdir)/config/user-libblkid.m4 \
 	$(top_srcdir)/config/user-libuuid.m4 \
+	$(top_srcdir)/config/user-no-unused-but-set-variable.m4 \
 	$(top_srcdir)/config/user-nptl_guard_within_stack.m4 \
 	$(top_srcdir)/config/user-selinux.m4 \
 	$(top_srcdir)/config/user-zlib.m4 $(top_srcdir)/config/user.m4 \
@ -214,6 +215,7 @@ MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
 NM = @NM@
 NMEDIT = @NMEDIT@
+NO_UNUSED_BUT_SET_VARIABLE = @NO_UNUSED_BUT_SET_VARIABLE@
 OBJDUMP = @OBJDUMP@
 OBJEXT = @OBJEXT@
 OTOOL = @OTOOL@
@ -313,7 +315,7 @@ DEFAULT_INCLUDES = -include ${top_builddir}/zfs_config.h \
 	-I$(top_srcdir)/include -I$(top_srcdir)/lib/libspl/include
 AM_LIBTOOLFLAGS = --silent
 AM_CFLAGS = -Wall -Wstrict-prototypes -fno-strict-aliasing \
-	-Wno-unused-but-set-variable ${DEBUG_CFLAGS} -D_GNU_SOURCE \
+	${NO_UNUSED_BUT_SET_VARIABLE} ${DEBUG_CFLAGS} -D_GNU_SOURCE \
 	-D__EXTENSIONS__ -D_REENTRANT -D_POSIX_PTHREAD_SEMANTICS \
 	-D_FILE_OFFSET_BITS=64 -D_LARGEFILE64_SOURCE \
 	-DTEXT_DOMAIN=\"zfs-linux-user\" $(DEBUG_STACKFLAGS) \
--- a/lib/libspl/Makefile.in
+++ b/lib/libspl/Makefile.in
@ -72,6 +72,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/user-ioctl.m4 \
 	$(top_srcdir)/config/user-libblkid.m4 \
 	$(top_srcdir)/config/user-libuuid.m4 \
+	$(top_srcdir)/config/user-no-unused-but-set-variable.m4 \
 	$(top_srcdir)/config/user-nptl_guard_within_stack.m4 \
 	$(top_srcdir)/config/user-selinux.m4 \
 	$(top_srcdir)/config/user-zlib.m4 $(top_srcdir)/config/user.m4 \
@ -264,6 +265,7 @@ MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
 NM = @NM@
 NMEDIT = @NMEDIT@
+NO_UNUSED_BUT_SET_VARIABLE = @NO_UNUSED_BUT_SET_VARIABLE@
 OBJDUMP = @OBJDUMP@
 OBJEXT = @OBJEXT@
 OTOOL = @OTOOL@
@ -363,7 +365,7 @@ DEFAULT_INCLUDES = -include ${top_builddir}/zfs_config.h \
 	-I$(top_srcdir)/lib/libspl/include
 AM_LIBTOOLFLAGS = --silent
 AM_CFLAGS = -Wall -Wstrict-prototypes -fno-strict-aliasing \
-	-Wno-unused-but-set-variable ${DEBUG_CFLAGS} -D_GNU_SOURCE \
+	${NO_UNUSED_BUT_SET_VARIABLE} ${DEBUG_CFLAGS} -D_GNU_SOURCE \
 	-D__EXTENSIONS__ -D_REENTRANT -D_POSIX_PTHREAD_SEMANTICS \
 	-D_FILE_OFFSET_BITS=64 -D_LARGEFILE64_SOURCE \
 	-DTEXT_DOMAIN=\"zfs-linux-user\" $(DEBUG_STACKFLAGS) \
--- a/lib/libspl/asm-generic/Makefile.in
+++ b/lib/libspl/asm-generic/Makefile.in
@ -71,6 +71,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/user-ioctl.m4 \
 	$(top_srcdir)/config/user-libblkid.m4 \
 	$(top_srcdir)/config/user-libuuid.m4 \
+	$(top_srcdir)/config/user-no-unused-but-set-variable.m4 \
 	$(top_srcdir)/config/user-nptl_guard_within_stack.m4 \
 	$(top_srcdir)/config/user-selinux.m4 \
 	$(top_srcdir)/config/user-zlib.m4 $(top_srcdir)/config/user.m4 \
@ -162,6 +163,7 @@ MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
 NM = @NM@
 NMEDIT = @NMEDIT@
+NO_UNUSED_BUT_SET_VARIABLE = @NO_UNUSED_BUT_SET_VARIABLE@
 OBJDUMP = @OBJDUMP@
 OBJEXT = @OBJEXT@
 OTOOL = @OTOOL@
@ -261,7 +263,7 @@ DEFAULT_INCLUDES = -include ${top_builddir}/zfs_config.h \
 	-I$(top_srcdir)/lib/libspl/include
 AM_LIBTOOLFLAGS = --silent
 AM_CFLAGS = -Wall -Wstrict-prototypes -fno-strict-aliasing \
-	-Wno-unused-but-set-variable ${DEBUG_CFLAGS} -D_GNU_SOURCE \
+	${NO_UNUSED_BUT_SET_VARIABLE} ${DEBUG_CFLAGS} -D_GNU_SOURCE \
 	-D__EXTENSIONS__ -D_REENTRANT -D_POSIX_PTHREAD_SEMANTICS \
 	-D_FILE_OFFSET_BITS=64 -D_LARGEFILE64_SOURCE \
 	-DTEXT_DOMAIN=\"zfs-linux-user\"
--- a/lib/libspl/asm-i386/Makefile.in
+++ b/lib/libspl/asm-i386/Makefile.in
@ -72,6 +72,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/user-ioctl.m4 \
 	$(top_srcdir)/config/user-libblkid.m4 \
 	$(top_srcdir)/config/user-libuuid.m4 \
+	$(top_srcdir)/config/user-no-unused-but-set-variable.m4 \
 	$(top_srcdir)/config/user-nptl_guard_within_stack.m4 \
 	$(top_srcdir)/config/user-selinux.m4 \
 	$(top_srcdir)/config/user-zlib.m4 $(top_srcdir)/config/user.m4 \
@ -166,6 +167,7 @@ MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
 NM = @NM@
 NMEDIT = @NMEDIT@
+NO_UNUSED_BUT_SET_VARIABLE = @NO_UNUSED_BUT_SET_VARIABLE@
 OBJDUMP = @OBJDUMP@
 OBJEXT = @OBJEXT@
 OTOOL = @OTOOL@
--- a/lib/libspl/asm-x86_64/Makefile.in
+++ b/lib/libspl/asm-x86_64/Makefile.in
@ -72,6 +72,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/user-ioctl.m4 \
 	$(top_srcdir)/config/user-libblkid.m4 \
 	$(top_srcdir)/config/user-libuuid.m4 \
+	$(top_srcdir)/config/user-no-unused-but-set-variable.m4 \
 	$(top_srcdir)/config/user-nptl_guard_within_stack.m4 \
 	$(top_srcdir)/config/user-selinux.m4 \
 	$(top_srcdir)/config/user-zlib.m4 $(top_srcdir)/config/user.m4 \
@ -166,6 +167,7 @@ MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
 NM = @NM@
 NMEDIT = @NMEDIT@
+NO_UNUSED_BUT_SET_VARIABLE = @NO_UNUSED_BUT_SET_VARIABLE@
 OBJDUMP = @OBJDUMP@
 OBJEXT = @OBJEXT@
 OTOOL = @OTOOL@
--- a/lib/libspl/include/Makefile.in
+++ b/lib/libspl/include/Makefile.in
@ -72,6 +72,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/user-ioctl.m4 \
 	$(top_srcdir)/config/user-libblkid.m4 \
 	$(top_srcdir)/config/user-libuuid.m4 \
+	$(top_srcdir)/config/user-no-unused-but-set-variable.m4 \
 	$(top_srcdir)/config/user-nptl_guard_within_stack.m4 \
 	$(top_srcdir)/config/user-selinux.m4 \
 	$(top_srcdir)/config/user-zlib.m4 $(top_srcdir)/config/user.m4 \
@ -226,6 +227,7 @@ MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
 NM = @NM@
 NMEDIT = @NMEDIT@
+NO_UNUSED_BUT_SET_VARIABLE = @NO_UNUSED_BUT_SET_VARIABLE@
 OBJDUMP = @OBJDUMP@
 OBJEXT = @OBJEXT@
 OTOOL = @OTOOL@
--- a/lib/libspl/include/ia32/Makefile.in
+++ b/lib/libspl/include/ia32/Makefile.in
@ -70,6 +70,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/user-ioctl.m4 \
 	$(top_srcdir)/config/user-libblkid.m4 \
 	$(top_srcdir)/config/user-libuuid.m4 \
+	$(top_srcdir)/config/user-no-unused-but-set-variable.m4 \
 	$(top_srcdir)/config/user-nptl_guard_within_stack.m4 \
 	$(top_srcdir)/config/user-selinux.m4 \
 	$(top_srcdir)/config/user-zlib.m4 $(top_srcdir)/config/user.m4 \
@ -201,6 +202,7 @@ MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
 NM = @NM@
 NMEDIT = @NMEDIT@
+NO_UNUSED_BUT_SET_VARIABLE = @NO_UNUSED_BUT_SET_VARIABLE@
 OBJDUMP = @OBJDUMP@
 OBJEXT = @OBJEXT@
 OTOOL = @OTOOL@
--- a/lib/libspl/include/ia32/sys/Makefile.in
+++ b/lib/libspl/include/ia32/sys/Makefile.in
@ -72,6 +72,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/user-ioctl.m4 \
 	$(top_srcdir)/config/user-libblkid.m4 \
 	$(top_srcdir)/config/user-libuuid.m4 \
+	$(top_srcdir)/config/user-no-unused-but-set-variable.m4 \
 	$(top_srcdir)/config/user-nptl_guard_within_stack.m4 \
 	$(top_srcdir)/config/user-selinux.m4 \
 	$(top_srcdir)/config/user-zlib.m4 $(top_srcdir)/config/user.m4 \
@ -188,6 +189,7 @@ MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
 NM = @NM@
 NMEDIT = @NMEDIT@
+NO_UNUSED_BUT_SET_VARIABLE = @NO_UNUSED_BUT_SET_VARIABLE@
 OBJDUMP = @OBJDUMP@
 OBJEXT = @OBJEXT@
 OTOOL = @OTOOL@
--- a/lib/libspl/include/rpc/Makefile.in
+++ b/lib/libspl/include/rpc/Makefile.in
@ -72,6 +72,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/user-ioctl.m4 \
 	$(top_srcdir)/config/user-libblkid.m4 \
 	$(top_srcdir)/config/user-libuuid.m4 \
+	$(top_srcdir)/config/user-no-unused-but-set-variable.m4 \
 	$(top_srcdir)/config/user-nptl_guard_within_stack.m4 \
 	$(top_srcdir)/config/user-selinux.m4 \
 	$(top_srcdir)/config/user-zlib.m4 $(top_srcdir)/config/user.m4 \
@ -188,6 +189,7 @@ MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
 NM = @NM@
 NMEDIT = @NMEDIT@
+NO_UNUSED_BUT_SET_VARIABLE = @NO_UNUSED_BUT_SET_VARIABLE@
 OBJDUMP = @OBJDUMP@
 OBJEXT = @OBJEXT@
 OTOOL = @OTOOL@
--- a/lib/libspl/include/sys/Makefile.in
+++ b/lib/libspl/include/sys/Makefile.in
@ -72,6 +72,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/user-ioctl.m4 \
 	$(top_srcdir)/config/user-libblkid.m4 \
 	$(top_srcdir)/config/user-libuuid.m4 \
+	$(top_srcdir)/config/user-no-unused-but-set-variable.m4 \
 	$(top_srcdir)/config/user-nptl_guard_within_stack.m4 \
 	$(top_srcdir)/config/user-selinux.m4 \
 	$(top_srcdir)/config/user-zlib.m4 $(top_srcdir)/config/user.m4 \
@ -226,6 +227,7 @@ MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
 NM = @NM@
 NMEDIT = @NMEDIT@
+NO_UNUSED_BUT_SET_VARIABLE = @NO_UNUSED_BUT_SET_VARIABLE@
 OBJDUMP = @OBJDUMP@
 OBJEXT = @OBJEXT@
 OTOOL = @OTOOL@
--- a/lib/libspl/include/sys/dktp/Makefile.in
+++ b/lib/libspl/include/sys/dktp/Makefile.in
@ -72,6 +72,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/user-ioctl.m4 \
 	$(top_srcdir)/config/user-libblkid.m4 \
 	$(top_srcdir)/config/user-libuuid.m4 \
+	$(top_srcdir)/config/user-no-unused-but-set-variable.m4 \
 	$(top_srcdir)/config/user-nptl_guard_within_stack.m4 \
 	$(top_srcdir)/config/user-selinux.m4 \
 	$(top_srcdir)/config/user-zlib.m4 $(top_srcdir)/config/user.m4 \
@ -188,6 +189,7 @@ MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
 NM = @NM@
 NMEDIT = @NMEDIT@
+NO_UNUSED_BUT_SET_VARIABLE = @NO_UNUSED_BUT_SET_VARIABLE@
 OBJDUMP = @OBJDUMP@
 OBJEXT = @OBJEXT@
 OTOOL = @OTOOL@
--- a/lib/libspl/include/sys/sysevent/Makefile.in
+++ b/lib/libspl/include/sys/sysevent/Makefile.in
@ -72,6 +72,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/user-ioctl.m4 \
 	$(top_srcdir)/config/user-libblkid.m4 \
 	$(top_srcdir)/config/user-libuuid.m4 \
+	$(top_srcdir)/config/user-no-unused-but-set-variable.m4 \
 	$(top_srcdir)/config/user-nptl_guard_within_stack.m4 \
 	$(top_srcdir)/config/user-selinux.m4 \
 	$(top_srcdir)/config/user-zlib.m4 $(top_srcdir)/config/user.m4 \
@ -188,6 +189,7 @@ MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
 NM = @NM@
 NMEDIT = @NMEDIT@
+NO_UNUSED_BUT_SET_VARIABLE = @NO_UNUSED_BUT_SET_VARIABLE@
 OBJDUMP = @OBJDUMP@
 OBJEXT = @OBJEXT@
 OTOOL = @OTOOL@
--- a/lib/libspl/include/util/Makefile.in
+++ b/lib/libspl/include/util/Makefile.in
@ -72,6 +72,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/user-ioctl.m4 \
 	$(top_srcdir)/config/user-libblkid.m4 \
 	$(top_srcdir)/config/user-libuuid.m4 \
+	$(top_srcdir)/config/user-no-unused-but-set-variable.m4 \
 	$(top_srcdir)/config/user-nptl_guard_within_stack.m4 \
 	$(top_srcdir)/config/user-selinux.m4 \
 	$(top_srcdir)/config/user-zlib.m4 $(top_srcdir)/config/user.m4 \
@ -188,6 +189,7 @@ MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
 NM = @NM@
 NMEDIT = @NMEDIT@
+NO_UNUSED_BUT_SET_VARIABLE = @NO_UNUSED_BUT_SET_VARIABLE@
 OBJDUMP = @OBJDUMP@
 OBJEXT = @OBJEXT@
 OTOOL = @OTOOL@
--- a/lib/libunicode/Makefile.in
+++ b/lib/libunicode/Makefile.in
@ -72,6 +72,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/user-ioctl.m4 \
 	$(top_srcdir)/config/user-libblkid.m4 \
 	$(top_srcdir)/config/user-libuuid.m4 \
+	$(top_srcdir)/config/user-no-unused-but-set-variable.m4 \
 	$(top_srcdir)/config/user-nptl_guard_within_stack.m4 \
 	$(top_srcdir)/config/user-selinux.m4 \
 	$(top_srcdir)/config/user-zlib.m4 $(top_srcdir)/config/user.m4 \
@ -213,6 +214,7 @@ MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
 NM = @NM@
 NMEDIT = @NMEDIT@
+NO_UNUSED_BUT_SET_VARIABLE = @NO_UNUSED_BUT_SET_VARIABLE@
 OBJDUMP = @OBJDUMP@
 OBJEXT = @OBJEXT@
 OTOOL = @OTOOL@
@ -312,7 +314,7 @@ DEFAULT_INCLUDES = -include ${top_builddir}/zfs_config.h \
 	-I$(top_srcdir)/include -I$(top_srcdir)/lib/libspl/include
 AM_LIBTOOLFLAGS = --silent
 AM_CFLAGS = -Wall -Wstrict-prototypes -fno-strict-aliasing \
-	-Wno-unused-but-set-variable ${DEBUG_CFLAGS} -D_GNU_SOURCE \
+	${NO_UNUSED_BUT_SET_VARIABLE} ${DEBUG_CFLAGS} -D_GNU_SOURCE \
 	-D__EXTENSIONS__ -D_REENTRANT -D_POSIX_PTHREAD_SEMANTICS \
 	-D_FILE_OFFSET_BITS=64 -D_LARGEFILE64_SOURCE \
 	-DTEXT_DOMAIN=\"zfs-linux-user\" $(DEBUG_STACKFLAGS) \
--- a/lib/libuutil/Makefile.in
+++ b/lib/libuutil/Makefile.in
@ -72,6 +72,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/user-ioctl.m4 \
 	$(top_srcdir)/config/user-libblkid.m4 \
 	$(top_srcdir)/config/user-libuuid.m4 \
+	$(top_srcdir)/config/user-no-unused-but-set-variable.m4 \
 	$(top_srcdir)/config/user-nptl_guard_within_stack.m4 \
 	$(top_srcdir)/config/user-selinux.m4 \
 	$(top_srcdir)/config/user-zlib.m4 $(top_srcdir)/config/user.m4 \
@ -215,6 +216,7 @@ MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
 NM = @NM@
 NMEDIT = @NMEDIT@
+NO_UNUSED_BUT_SET_VARIABLE = @NO_UNUSED_BUT_SET_VARIABLE@
 OBJDUMP = @OBJDUMP@
 OBJEXT = @OBJEXT@
 OTOOL = @OTOOL@
@ -314,7 +316,7 @@ DEFAULT_INCLUDES = -include ${top_builddir}/zfs_config.h \
 	-I$(top_srcdir)/include -I$(top_srcdir)/lib/libspl/include
 AM_LIBTOOLFLAGS = --silent
 AM_CFLAGS = -Wall -Wstrict-prototypes -fno-strict-aliasing \
-	-Wno-unused-but-set-variable ${DEBUG_CFLAGS} -D_GNU_SOURCE \
+	${NO_UNUSED_BUT_SET_VARIABLE} ${DEBUG_CFLAGS} -D_GNU_SOURCE \
 	-D__EXTENSIONS__ -D_REENTRANT -D_POSIX_PTHREAD_SEMANTICS \
 	-D_FILE_OFFSET_BITS=64 -D_LARGEFILE64_SOURCE \
 	-DTEXT_DOMAIN=\"zfs-linux-user\" $(DEBUG_STACKFLAGS) \
--- a/lib/libzfs/Makefile.in
+++ b/lib/libzfs/Makefile.in
@ -72,6 +72,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/user-ioctl.m4 \
 	$(top_srcdir)/config/user-libblkid.m4 \
 	$(top_srcdir)/config/user-libuuid.m4 \
+	$(top_srcdir)/config/user-no-unused-but-set-variable.m4 \
 	$(top_srcdir)/config/user-nptl_guard_within_stack.m4 \
 	$(top_srcdir)/config/user-selinux.m4 \
 	$(top_srcdir)/config/user-zlib.m4 $(top_srcdir)/config/user.m4 \
@ -223,6 +224,7 @@ MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
 NM = @NM@
 NMEDIT = @NMEDIT@
+NO_UNUSED_BUT_SET_VARIABLE = @NO_UNUSED_BUT_SET_VARIABLE@
 OBJDUMP = @OBJDUMP@
 OBJEXT = @OBJEXT@
 OTOOL = @OTOOL@
@ -322,7 +324,7 @@ DEFAULT_INCLUDES = -include ${top_builddir}/zfs_config.h \
 	-I$(top_srcdir)/include -I$(top_srcdir)/lib/libspl/include
 AM_LIBTOOLFLAGS = --silent
 AM_CFLAGS = -Wall -Wstrict-prototypes -fno-strict-aliasing \
-	-Wno-unused-but-set-variable ${DEBUG_CFLAGS} -D_GNU_SOURCE \
+	${NO_UNUSED_BUT_SET_VARIABLE} ${DEBUG_CFLAGS} -D_GNU_SOURCE \
 	-D__EXTENSIONS__ -D_REENTRANT -D_POSIX_PTHREAD_SEMANTICS \
 	-D_FILE_OFFSET_BITS=64 -D_LARGEFILE64_SOURCE \
 	-DTEXT_DOMAIN=\"zfs-linux-user\"
--- a/lib/libzpool/Makefile.in
+++ b/lib/libzpool/Makefile.in
@ -72,6 +72,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/user-ioctl.m4 \
 	$(top_srcdir)/config/user-libblkid.m4 \
 	$(top_srcdir)/config/user-libuuid.m4 \
+	$(top_srcdir)/config/user-no-unused-but-set-variable.m4 \
 	$(top_srcdir)/config/user-nptl_guard_within_stack.m4 \
 	$(top_srcdir)/config/user-selinux.m4 \
 	$(top_srcdir)/config/user-zlib.m4 $(top_srcdir)/config/user.m4 \
@ -234,6 +235,7 @@ MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
 NM = @NM@
 NMEDIT = @NMEDIT@
+NO_UNUSED_BUT_SET_VARIABLE = @NO_UNUSED_BUT_SET_VARIABLE@
 OBJDUMP = @OBJDUMP@
 OBJEXT = @OBJEXT@
 OTOOL = @OTOOL@
@ -333,7 +335,7 @@ DEFAULT_INCLUDES = -include ${top_builddir}/zfs_config.h \
 	-I$(top_srcdir)/include -I$(top_srcdir)/lib/libspl/include
 AM_LIBTOOLFLAGS = --silent
 AM_CFLAGS = -Wall -Wstrict-prototypes -fno-strict-aliasing \
-	-Wno-unused-but-set-variable ${DEBUG_CFLAGS} -D_GNU_SOURCE \
+	${NO_UNUSED_BUT_SET_VARIABLE} ${DEBUG_CFLAGS} -D_GNU_SOURCE \
 	-D__EXTENSIONS__ -D_REENTRANT -D_POSIX_PTHREAD_SEMANTICS \
 	-D_FILE_OFFSET_BITS=64 -D_LARGEFILE64_SOURCE \
 	-DTEXT_DOMAIN=\"zfs-linux-user\" $(DEBUG_STACKFLAGS) \
--- a/man/Makefile.in
+++ b/man/Makefile.in
@ -70,6 +70,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/user-ioctl.m4 \
 	$(top_srcdir)/config/user-libblkid.m4 \
 	$(top_srcdir)/config/user-libuuid.m4 \
+	$(top_srcdir)/config/user-no-unused-but-set-variable.m4 \
 	$(top_srcdir)/config/user-nptl_guard_within_stack.m4 \
 	$(top_srcdir)/config/user-selinux.m4 \
 	$(top_srcdir)/config/user-zlib.m4 $(top_srcdir)/config/user.m4 \
@ -201,6 +202,7 @@ MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
 NM = @NM@
 NMEDIT = @NMEDIT@
+NO_UNUSED_BUT_SET_VARIABLE = @NO_UNUSED_BUT_SET_VARIABLE@
 OBJDUMP = @OBJDUMP@
 OBJEXT = @OBJEXT@
 OTOOL = @OTOOL@
--- a/man/man8/Makefile.in
+++ b/man/man8/Makefile.in
@ -70,6 +70,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/user-ioctl.m4 \
 	$(top_srcdir)/config/user-libblkid.m4 \
 	$(top_srcdir)/config/user-libuuid.m4 \
+	$(top_srcdir)/config/user-no-unused-but-set-variable.m4 \
 	$(top_srcdir)/config/user-nptl_guard_within_stack.m4 \
 	$(top_srcdir)/config/user-selinux.m4 \
 	$(top_srcdir)/config/user-zlib.m4 $(top_srcdir)/config/user.m4 \
@ -186,6 +187,7 @@ MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
 NM = @NM@
 NMEDIT = @NMEDIT@
+NO_UNUSED_BUT_SET_VARIABLE = @NO_UNUSED_BUT_SET_VARIABLE@
 OBJDUMP = @OBJDUMP@
 OBJEXT = @OBJEXT@
 OTOOL = @OTOOL@
--- a/scripts/Makefile.in
+++ b/scripts/Makefile.in
@ -71,6 +71,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/user-ioctl.m4 \
 	$(top_srcdir)/config/user-libblkid.m4 \
 	$(top_srcdir)/config/user-libuuid.m4 \
+	$(top_srcdir)/config/user-no-unused-but-set-variable.m4 \
 	$(top_srcdir)/config/user-nptl_guard_within_stack.m4 \
 	$(top_srcdir)/config/user-selinux.m4 \
 	$(top_srcdir)/config/user-zlib.m4 $(top_srcdir)/config/user.m4 \
@ -226,6 +227,7 @@ MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
 NM = @NM@
 NMEDIT = @NMEDIT@
+NO_UNUSED_BUT_SET_VARIABLE = @NO_UNUSED_BUT_SET_VARIABLE@
 OBJDUMP = @OBJDUMP@
 OBJEXT = @OBJEXT@
 OTOOL = @OTOOL@
--- a/scripts/zpios-profile/Makefile.in
+++ b/scripts/zpios-profile/Makefile.in
@ -71,6 +71,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/user-ioctl.m4 \
 	$(top_srcdir)/config/user-libblkid.m4 \
 	$(top_srcdir)/config/user-libuuid.m4 \
+	$(top_srcdir)/config/user-no-unused-but-set-variable.m4 \
 	$(top_srcdir)/config/user-nptl_guard_within_stack.m4 \
 	$(top_srcdir)/config/user-selinux.m4 \
 	$(top_srcdir)/config/user-zlib.m4 $(top_srcdir)/config/user.m4 \
@ -186,6 +187,7 @@ MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
 NM = @NM@
 NMEDIT = @NMEDIT@
+NO_UNUSED_BUT_SET_VARIABLE = @NO_UNUSED_BUT_SET_VARIABLE@
 OBJDUMP = @OBJDUMP@
 OBJEXT = @OBJEXT@
 OTOOL = @OTOOL@
--- a/scripts/zpios-test/Makefile.in
+++ b/scripts/zpios-test/Makefile.in
@ -71,6 +71,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/user-ioctl.m4 \
 	$(top_srcdir)/config/user-libblkid.m4 \
 	$(top_srcdir)/config/user-libuuid.m4 \
+	$(top_srcdir)/config/user-no-unused-but-set-variable.m4 \
 	$(top_srcdir)/config/user-nptl_guard_within_stack.m4 \
 	$(top_srcdir)/config/user-selinux.m4 \
 	$(top_srcdir)/config/user-zlib.m4 $(top_srcdir)/config/user.m4 \
@ -186,6 +187,7 @@ MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
 NM = @NM@
 NMEDIT = @NMEDIT@
+NO_UNUSED_BUT_SET_VARIABLE = @NO_UNUSED_BUT_SET_VARIABLE@
 OBJDUMP = @OBJDUMP@
 OBJEXT = @OBJEXT@
 OTOOL = @OTOOL@
--- a/scripts/zpool-config/Makefile.in
+++ b/scripts/zpool-config/Makefile.in
@ -71,6 +71,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/user-ioctl.m4 \
 	$(top_srcdir)/config/user-libblkid.m4 \
 	$(top_srcdir)/config/user-libuuid.m4 \
+	$(top_srcdir)/config/user-no-unused-but-set-variable.m4 \
 	$(top_srcdir)/config/user-nptl_guard_within_stack.m4 \
 	$(top_srcdir)/config/user-selinux.m4 \
 	$(top_srcdir)/config/user-zlib.m4 $(top_srcdir)/config/user.m4 \
@ -186,6 +187,7 @@ MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
 NM = @NM@
 NMEDIT = @NMEDIT@
+NO_UNUSED_BUT_SET_VARIABLE = @NO_UNUSED_BUT_SET_VARIABLE@
 OBJDUMP = @OBJDUMP@
 OBJEXT = @OBJEXT@
 OTOOL = @OTOOL@
--- a/scripts/zpool-layout/Makefile.in
+++ b/scripts/zpool-layout/Makefile.in
@ -71,6 +71,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/user-ioctl.m4 \
 	$(top_srcdir)/config/user-libblkid.m4 \
 	$(top_srcdir)/config/user-libuuid.m4 \
+	$(top_srcdir)/config/user-no-unused-but-set-variable.m4 \
 	$(top_srcdir)/config/user-nptl_guard_within_stack.m4 \
 	$(top_srcdir)/config/user-selinux.m4 \
 	$(top_srcdir)/config/user-zlib.m4 $(top_srcdir)/config/user.m4 \
@ -186,6 +187,7 @@ MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
 NM = @NM@
 NMEDIT = @NMEDIT@
+NO_UNUSED_BUT_SET_VARIABLE = @NO_UNUSED_BUT_SET_VARIABLE@
 OBJDUMP = @OBJDUMP@
 OBJEXT = @OBJEXT@
 OTOOL = @OTOOL@