build: move make option changes check earlier
authorAnthony PERARD <anthony.perard@citrix.com>
Tue, 7 Sep 2021 07:31:02 +0000 (09:31 +0200)
committerJan Beulich <jbeulich@suse.com>
Tue, 7 Sep 2021 07:31:02 +0000 (09:31 +0200)
commitd9bdfdacf9e26e1043cb57c9822f8b19509db766
tree7d684cd350bd876f8a3da22f11ef4a098586decf
parentd4f269e6f4fd08956d082aecd111f220662f18b1
build: move make option changes check earlier

And thus avoiding checking for those variable over and over again.

Also, add "e.g." in the error messages to hint that "menuconfig"
isn't the only way.

Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
xen/Makefile
xen/Rules.mk