Initial commit

include/depends.mk

@@ -0,0 +1,53 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Copyright (C) 2007-2020 OpenWrt.org
+
+# define a dependency on a subtree
+# parameters:
+#	1: directories/files
+#	2: directory dependency
+#	3: tempfile for file listings
+#	4: find options
+
+DEP_FINDPARAMS := -x "*/.svn*" -x ".*" -x "*:*" -x "*\!*" -x "* *" -x "*\\\#*" -x "*/.*_check" -x "*/.*.swp" -x "*/.pkgdir*"
+
+find_md5=find $(wildcard $(1)) -type f $(patsubst -x,-and -not -path,$(DEP_FINDPARAMS) $(2)) -printf "%p%T@\n" | sort | $(MKHASH) md5
+find_md5_reproducible=find $(wildcard $(1)) -type f $(patsubst -x,-and -not -path,$(DEP_FINDPARAMS) $(2)) -print0 | xargs -0 $(MKHASH) md5 | sort | $(MKHASH) md5
+
+define rdep
+  .PRECIOUS: $(2)
+  .SILENT: $(2)_check
+
+  $(2): $(2)_check
+  check-depends: $(2)_check
+
+ifneq ($(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 "$(2)_check.1" "$(2)_check"; \
+	    $(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 $(2) not built")
+endif
+
+endef
+
+ifeq ($(filter .%,$(MAKECMDGOALS)),$(if $(MAKECMDGOALS),$(MAKECMDGOALS),x))
+  define rdep
+    $(2): $(2)_check
+  endef
+endif