+# If .u-boot.cfg.d is still present, then either:
+# a) The previous build used a Makefile that used if_changed rather than
+# if_changed_dep when building u-boot.cfg, and hence any later builds will
+# be unaware of the dependencies for u-boot.cfg. In this case, we must
+# delete u-boot.cfg to force it and .u-boot.cfg.cmd to be rebuilt the
+# correct way.
+# b) The previous build failed or was interrupted while building u-boot.cfg,
+# so deleting u-boot.cfg isn't going to cause any additional work.
+ifneq ($(wildcard $(obj)/.u-boot.cfg.d),)
+ unused := $(shell rm -f $(obj)/u-boot.cfg)
+endif
+u-boot.cfg: include/config.h FORCE
+ $(call if_changed_dep,cpp_cfg)
+
+# Check that this build does not use CONFIG options that we don't know about
+# unless they are in Kconfig. All the existing CONFIG options are whitelisted,
+# so new ones should not be added.
+no_new_adhoc_configs_check: u-boot.cfg FORCE
+ $(srctree)/scripts/check-config.sh $< \
+ $(srctree)/scripts/config_whitelist.txt ${srctree} 1>&2