util/kconfig: Import some more of Linux's build infra
cmd and cmd_conf_cfg are necessary for `make menuconfig`
and `make nconfig`.
Change-Id: Ie16ef31a8e0137f3fd4129fb73ca6ef4669173cc
Signed-off-by: Patrick Georgi <patrick@georgi.software>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/79264
Reviewed-by: Mike Banon <mikebdp2@gmail.com>
Reviewed-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-by: Felix Singer <service+coreboot-gerrit@felixsinger.de>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin L Roth <gaumless@gmail.com>
diff --git a/util/kconfig/Makefile.inc b/util/kconfig/Makefile.inc
index 0614bb0..3a9f353 100644
--- a/util/kconfig/Makefile.inc
+++ b/util/kconfig/Makefile.inc
@@ -25,6 +25,9 @@
kecho := echo
+cmd = $(cmd_$(1))
+cmd_conf_cfg = $< $(addprefix $(obj)/$*conf-, cflags libs bin); touch $(obj)/$*conf-bin
+
###
# Read a file, replacing newlines with spaces
#