Re: recursive make: communicating target to sub-makes

[Daniel Kabs]

Hello,

again replying to myself :-)

>  >>SUBDIRS = foo bar baz
>
> > ALL = $(addsuffix -all,$(SUBDIRS))
> > all: $(ALL)
> > $(ALL):
> >           $(MAKE) -C $(@:-all=) all
> Creating targets using variables is a good idea but I don't see how I 
> can declare dependencies (e.g. say "bar" has to be compiled before 
> "foo"). Well, I can list the SUBDIRS in a certain order but that does 
> not work when "make" runs jobs concurrently (using option -j).

I finally solved this by using the variable MAKECMDGOALS to propagate 
the target specified on the command line to the sub-makefiles.


all clean install: $(SUBDIRS)

.PHONY: $(SUBDIRS)
$(SUBDIRS):
        $(MAKE) -C $@ $(MAKECMDGOALS)


This way you can run multiple make jobs simultaneously (using -j) and 
set dependencies, e.g. "bar" depends on "baz", write

bar: baz


Cheers
Daniel Kabs
Germany