Make the "show" target work anywhere in the build tree

SUBMAKEHELP

@@ -22,6 +22,10 @@
      
      Make documentation in this directory (if any)
 
+  make show VALUE=var
+
+     Show the value of $(var)
+
   make <file>
 
      Bring a particular file up to date, e.g. make dist/build/Module.o

mk/sub-makefile.mk

@@ -36,13 +36,17 @@ endif
 .NOTPARALLEL:
 
 STD_TARGETS = all clean distclean maintainer_clean install html ps pdf
+DIRECTORY_INDEPENDENT_TARGETS = show
 
 # The + tells make that we're recursively invoking make, otherwise 'make -j2'
 # goes wrong.
 $(STD_TARGETS): 
 	+$(TOPMAKE) $@_$(dir) $(EXTRA_MAKE_OPTS)
 
-OTHERTARGETS=$(filter-out fast help $(STD_TARGETS) $(SPEC_TARGETS),$(MAKECMDGOALS))
+$(DIRECTORY_INDEPENDENT_TARGETS):
+	+$(TOPMAKE) $@ $(EXTRA_MAKE_OPTS)
+
+OTHERTARGETS=$(filter-out fast help show $(STD_TARGETS) $(SPEC_TARGETS),$(MAKECMDGOALS))
 .PHONY: $(OTHERTARGETS)
 $(OTHERTARGETS):
 	+$(TOPMAKE) $(dir)/$@ $(EXTRA_MAKE_OPTS)