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varmod-defined.mk revision 1.3 
      1 # $NetBSD: varmod-defined.mk,v 1.3 2020/08/25 21:58:08 rillig Exp $
      2 #
      3 # Tests for the :D variable modifier, which returns the given string
      4 # if the variable is defined.  It is closely related to the :U modifier.
      5 
      6 DEF=	defined
      7 .undef UNDEF
      8 
      9 # Since DEF is defined, the value of the expression is "value", not
     10 # "defined".
     11 #
     12 .if ${DEF:Dvalue} != "value"
     13 .error
     14 .endif
     15 
     16 # Since UNDEF is not defined, the "value" is ignored.  Instead of leaving the
     17 # expression undefined, it is set to "", exactly to allow the expression to
     18 # be used in .if conditions.  In this place, other undefined expressions
     19 # would generate an error message.
     20 # XXX: Ideally the error message would be "undefined variable", but as of
     21 # 2020-08-25 it is "Malformed conditional".
     22 #
     23 .if ${UNDEF:Dvalue} != ""
     24 .error
     25 .endif
     26 
     27 all:
     28 	@:;
     29