(make.info) If Function

 
 The `if' Function
 =================
 
    The `if' function provides support for conditional expansion in a
 functional context (as opposed to the GNU `make' makefile conditionals
 such as `ifeq' ( Syntax of Conditionals Conditional Syntax.).
 
    An `if' function call can contain either two or three arguments:
 
      $(if CONDITION,THEN-PART[,ELSE-PART])
 
    The first argument, CONDITION, first has all preceding and trailing
 whitespace stripped, then is expanded.  If it expands to any non-empty
 string, then the condition is considered to be true.  If it expands to
 an empty string, the condition is considered to be false.
 
    If the condition is true then the second argument, THEN-PART, is
 evaluated and this is used as the result of the evaluation of the entire
 `if' function.
 
    If the condition is false then the third argument, ELSE-PART, is
 evaluated and this is the result of the `if' function.  If there is no
 third argument, the `if' function evaluates to nothing (the empty
 string).
 
    Note that only one of the THEN-PART or the ELSE-PART will be
 evaluated, never both.  Thus, either can contain side-effects (such as
 `shell' function calls, etc.)

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