make: Flavor Function

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1 8.11 The 'flavor' Function
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1 The 'flavor' function, like the 'origin' function, does not operate on
1 the values of variables but rather it tells you something _about_ a
11 variable.  Specifically, it tells you the flavor of a variable (⇒
 The Two Flavors of Variables Flavors.).
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1    The syntax of the 'flavor' function is:
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1      $(flavor VARIABLE)
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1    Note that VARIABLE is the _name_ of a variable to inquire about, not
1 a _reference_ to that variable.  Therefore you would not normally use a
1 '$' or parentheses when writing it.  (You can, however, use a variable
1 reference in the name if you want the name not to be a constant.)
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1    The result of this function is a string that identifies the flavor of
1 the variable VARIABLE:
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1 'undefined'
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1      if VARIABLE was never defined.
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1 'recursive'
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1      if VARIABLE is a recursively expanded variable.
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1 'simple'
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1      if VARIABLE is a simply expanded variable.
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