Only use gcc -Wunused-but-set-variable when available

[zfs.git] / config / kernel-rq-is_sync.m4

diff --git a/config/kernel-rq-is_sync.m4 b/config/kernel-rq-is_sync.m4
index 507bf68..f6f51c8 100644 (file)
--- a/config/kernel-rq-is_sync.m4
+++ b/config/kernel-rq-is_sync.m4
@@ -4,7 +4,7 @@ dnl #
 AC_DEFUN([ZFS_AC_KERNEL_RQ_IS_SYNC], [
        AC_MSG_CHECKING([whether rq_is_sync() is available])
        tmp_flags="$EXTRA_KCFLAGS"
-       EXTRA_KCFLAGS="-Wno-unused-but-set-variable"
+       EXTRA_KCFLAGS="${NO_UNUSED_BUT_SET_VARIABLE}"
        ZFS_LINUX_TRY_COMPILE([
                #include <linux/blkdev.h>
        ],[