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cond-token-var.mk revision 1.3 
      1  1.3  rillig # $NetBSD: cond-token-var.mk,v 1.3 2020/08/20 19:43:42 rillig Exp $
      2  1.1  rillig #
      3  1.2  rillig # Tests for variables in .if conditions.
      4  1.1  rillig 
      5  1.3  rillig DEF=	defined
      6  1.1  rillig 
      7  1.3  rillig # A defined variable may appear on either side of the comparison.
      8  1.3  rillig .if ${DEF} == ${DEF}
      9  1.3  rillig .info ok
     10  1.3  rillig .else
     11  1.3  rillig .error
     12  1.3  rillig .endif
     13  1.3  rillig 
     14  1.3  rillig # A variable that appears on the left-hand side must be defined.
     15  1.3  rillig .if ${UNDEF} == ${DEF}
     16  1.3  rillig .error
     17  1.3  rillig .endif
     18  1.3  rillig 
     19  1.3  rillig # A variable that appears on the right-hand side must be defined.
     20  1.3  rillig .if ${DEF} == ${UNDEF}
     21  1.3  rillig .error
     22  1.3  rillig .endif
     23  1.3  rillig 
     24  1.3  rillig # A defined variable may appear as an expression of its own.
     25  1.3  rillig .if ${DEF}
     26  1.3  rillig .endif
     27  1.3  rillig 
     28  1.3  rillig # An undefined variable generates a warning.
     29  1.3  rillig .if ${UNDEF}
     30  1.3  rillig .endif
     31  1.3  rillig 
     32  1.3  rillig # The :U modifier turns an undefined variable into an ordinary expression.
     33  1.3  rillig .if ${UNDEF:U}
     34  1.3  rillig .endif
     35