Re: looking for help with auto creating rules with eval hierarchically

[John Graham-Cumming]

PATTON, BILLY (SBCSI) wrote:
> This works fine for proj alias PROJECTS
> Now looking at each of the PROJECTS I  need to create the same thing
> $(foreach var for each of the
> BB_<proj>  But I don't want to hard code all the names.  This needs to
> be expandable in the future
> This will then be further created for the TOPIC_<proj>_<bb>
>
> My first best try
> $foreach proj,${PROJECTS},
>
> Will give me the list names
> $(addprefix BB_,${PROJECTS})
>
> So would it be something like
> $(foreach proj,${PROJECTS}  # to capture project name
>   , $(foreach bb, $(addprefix BB_,${proj})) # name of list BB_<proj>
>   , $(eval $(call dummy_template, ${bb}))  # call define
>  ) # foreach 

What you want to do is calculate the name of a variable and then get its 
value.  That's trivial in GNU Make.  For example, take a look at this:

    X := Y
    YY := Hello!

    all:
        @echo $($X$X)

This will print Hello! because $($X$X) will first be expanded to $(YY) 
because X = Y and then $(YY) will be expanded to Hello!  So in your 
example what you want to do is this:

    $(foreac proj,$(PROJECTS),$(foreach bb,$(BB_$(proj)), $(eval $(call 
dummy_template,$(bb)))))

John.
--
John Graham-Cumming
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