$(foo) vs $(call foo)

[Stephan Beal]

Hello, Makers!

i've got a question which i think i know the answer to, but would like 
to get confirmation on it.

Let's say i have a macro:

  define my-macro
    df
  endef

The content of the macro is not (yet) significant for my question, which 
is:

is there a semantic difference between:

  foo:
      $(my-macro)

and:

  foo:
      $(call my-macro)


i understand that the $(call) is not necessary because i'm not passing 
any arguments, and that $(call) is necessary if i'm going to pass 
arguments. The question is, then: is there a real difference between 
$(my-macro) and $(call my-macro) if my-macro is not defined to use 
positional arguments (i.e. $(1) ... $(N))?

Many thanks in advance,

PS: i "think" the correct answer is, "there is no difference," but i'm 
willing to accept that there may be a subtle difference when other make 
variables/functions live inside the macro code.

-- 
----- stephan beal
http://www.wanderinghorse.net

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