RE: include question

[Paul D. Smith]

%% "Dill, John" <address@hidden> writes:

  dj> That's nice to know, but it seems a little too verbose.  I'd like
  dj> to do something more to the effect of 'include $(call
  dj> guard,defs.mk)' or '$(call include_guard,defs.mk)' where guard
  dj> would do something to check the appropriate tag.

include_guard = $(if $(filter $1,$(.VARIABLES)),,$1)

Unfortunately there's a problem here: I think plain "include" with no
file after it might be considered an error.

If so you'll need to use eval.

You need GNU make 3.80 for this.

  dj> Also, can you implement something like '$(call function,defs.mk)'
  dj> which will return the text of 'include defs.mk' if that test
  dj> passes, and make will perform the include.

No, but you can use eval to do it.  Again you need GNU make 3.80.

  dj> Also, can functions be used reliably to define variables?
  dj> Something like:

  dj> $(call tx_include_name,defs.mk):=1

Sure.

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