Add 'tree' make target to build whole subtree

- added 'tree' alias
- improved implementation of tree_$(d) targets: no need to have all of
  them listed in every target, it is more optimal to rely on
  dependencies between them

Makefile

@@ -21,7 +21,11 @@ MK := $(TOP)/mk
 
 .PHONY: all clean clean_all clean_tree
 
+# By default build only targets from this directory (and its dependencies)
 .DEFAULT_GOAL := dir_$(RUNDIR)
+# A shortcut to build whole subtree
+tree : tree_$(RUNDIR)
+
 clean : clean_$(RUNDIR)
 clean_tree : clean_tree_$(RUNDIR)
 

Readme.txt

@@ -282,11 +282,13 @@ to the directory where Rules.mk is).
 In addition to those each dir has "it's own" targets.  These are:
 
 1) dir_<directory_path>
-   which builds all targets in given directory
-2) clean_<directory_path>
+   which builds all targets in given directory plus its dependencies
+2) tree_<directory_path>
+   which builds all targets in subtree starting at directory given
+3) clean_<directory_path>
    which removes all "products" from the $(OBJDIR) subdirectory of
    current directory
-3) clean_tree_<directory_path>
+4) clean_tree_<directory_path>
    which does clean_<directory_path> and the same for each its
    subdirectory
 
@@ -304,6 +306,8 @@ Then:
    several subdirectories in one directory) then simple 'make' in this
    directory - instead of doing nothing - will build targets of all its
    subdirectories.
+* 'make tree' (same as 'make tree_$(pwd)')
+   rebuilds everything in given subtree
 * 'make clean' (same as 'make clean_$(pwd)')
    removes everything from Dir_1/obj/
 * 'make clean_tree (same as 'make clean_tree_$(pwd)')

mk/footer.mk

@@ -71,7 +71,7 @@ $(foreach tgt,$(filter-out $(AUTO_TGTS),$(TARGETS_$(d))),$(eval $(call tgt_rule,
 
 # Way to build all targets in given subtree (not just current dir as via
 # dir_$(d) - see below)
-tree_$(d) : $(call subtree_tgts,$(d))
+tree_$(d) : $(TARGETS_$(d)) $(foreach sd,$(SUBDIRS_$(d)),tree_$(sd))
 
 # If the directory is just for grouping its targets will be targets from
 # all subdirectories