ifneq ($(KBUILD_NOCMDDEP),1)
# Check if both commands are the same including their order. Result is empty
# string if equal. User may override this check using make KBUILD_NOCMDDEP=1
+# If the target does not exist, the *.cmd file should not be included so
+# $(savedcmd_$@) gets empty. Then, target will be built even if $(newer-prereqs)
+# happens to become empty.
cmd-check = $(filter-out $(subst $(space),$(space_escape),$(strip $(savedcmd_$@))), \
$(subst $(space),$(space_escape),$(strip $(cmd_$1))))
else
+# We still need to detect missing targets.
cmd-check = $(if $(strip $(savedcmd_$@)),,1)
endif
# Find any prerequisites that are newer than target or that do not exist.
# PHONY targets skipped in both cases.
+# If there is no prerequisite other than phony targets, $(newer-prereqs) becomes
+# empty even if the target does not exist. cmd-check saves this corner case.
newer-prereqs = $(filter-out $(PHONY),$?)
# It is a typical mistake to forget the FORCE prerequisite. Check it here so