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directive-ifdef.mk revision 1.4 
      1 # $NetBSD: directive-ifdef.mk,v 1.4 2021/01/21 23:03:41 rillig Exp $
      2 #
      3 # Tests for the .ifdef directive.
      4 
      5 # TODO: Implementation
      6 
      7 DEFINED=	defined
      8 
      9 # It looks redundant to have a call to defined() in an .ifdef, but it's
     10 # possible.  The .ifdef only affects plain symbols, not function calls.
     11 .ifdef defined(DEFINED)
     12 .  info Function calls in .ifdef are possible.
     13 .else
     14 .  error
     15 .endif
     16 
     17 # String literals are handled the same in all variants of the .if directive.
     18 # They evaluate to true if they are not empty.  Whitespace counts as non-empty
     19 # as well.
     20 .ifdef ""
     21 .  error
     22 .else
     23 .  info String literals are tested for emptiness.
     24 .endif
     25 
     26 .ifdef " "
     27 .  info String literals are tested for emptiness.  Whitespace is non-empty.
     28 .else
     29 .  error
     30 .endif
     31 
     32 all:
     33 	@:;
     34