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make: Flavor Function

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

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