Use foo := $(call objectify, $(foo)) to prefix $(foo) with $(obj)/ unless
$(foo) is an absolute path.
For now no in-tree users - soon to come.
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
cmd = @$(if $($(quiet)cmd_$(1)),\
echo ' $(subst ','\'',$($(quiet)cmd_$(1)))' &&) $(cmd_$(1))
+# Add $(obj)/ for paths that is not absolute
+objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o)))
+
###
# if_changed - execute command if any prerequisite is newer than
# target, or command line has changed