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

[mirror_zfs-debian.git] / config / kernel-get-disk-ro.m4

diff --git a/config/kernel-get-disk-ro.m4 b/config/kernel-get-disk-ro.m4
index aac69b7a10f25dbf83cd75ed3000b6397b777f47..13ed81217ee3ea472efbc1e237e59dcd039483d7 100644 (file)
--- a/config/kernel-get-disk-ro.m4
+++ b/config/kernel-get-disk-ro.m4
@@ -4,7 +4,7 @@ dnl #
 AC_DEFUN([ZFS_AC_KERNEL_GET_DISK_RO], [
        AC_MSG_CHECKING([whether get_disk_ro() 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>
        ],[