- ifneq ($(3),)
- ifneq ($$(shell find $(1) $(DEP_FINDPARAMS) $(4) 2>/dev/null | md5s),$(if $(3),$(shell cat $(3) || touch $(3) 2>/dev/null)))
- $(2): $(3)
- endif
-
- endif
+ $(2): $(2)_check
+
+ifneq ($(wildcard $(2)),)
+ $(2)_check::
+ $(if $(3), \
+ $(call find_md5,$(1),$(4)) > $(3).1; \
+ { [ \! -f "$(3)" ] || diff $(3) $(3).1 >/dev/null; } && \
+ ) \
+ { \
+ [ -f "$(2)_check.1" ] && mv "$(2)_check.1"; \
+ $(TOPDIR)/scripts/timestamp.pl $(DEP_FINDPARAMS) $(4) -n $(2) $(1) && { \
+ $(call debug_eval,$(SUBDIR),r,echo "No need to rebuild $(2)";) \
+ touch -r "$(2)" "$(2)_check"; \
+ } \
+ } || { \
+ $(call debug_eval,$(SUBDIR),r,echo "Need to rebuild $(2)";) \
+ touch "$(2)_check"; \
+ }
+ $(if $(3), mv $(3).1 $(3))
+else
+ $(2)_check::
+ $(if $(3), rm -f $(3) $(3).1)
+ $(call debug_eval,$(SUBDIR),r,echo "Target $(2) not built")
+endif