change the recursive dependency template to use more make evaluation - the shell command got so long that it triggered "Argument list too long" on some systems (#8231)

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@24131 3c298f89-4303-0410-b956-a3cf2f4a3e73

include/depends.mk

@@ -20,8 +20,9 @@ define rdep
   .SILENT: $(2)_check
 
   $(2): $(2)_check
+
+ifneq ($(wildcard $(2)),)
   $(2)_check::
-	if [ -f "$(2)" ]; then \
 	$(if $(3), \
 		$(call find_md5,$(1),$(4)) > $(3).1; \
 		{ [ \! -f "$(3)" ] || diff $(3) $(3).1 >/dev/null; } && \
@@ -35,13 +36,13 @@ define rdep
 	} || { \
 		$(call debug_eval,$(SUBDIR),r,echo "Need to rebuild $(2)";) \
 		touch "$(2)_check"; \
-		}; \
-		$(if $(3), mv $(3).1 $(3);) \
-	else \
-		$(if $(3), rm -f $(3) $(3).1;) \
-		$(call debug_eval,$(SUBDIR),r,echo "Target $(2) not built";) \
-		true; \
-	fi
+	}
+	$(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