1 # $NetBSD: varmod-defined.mk,v 1.3 2020/08/25 21:58:08 rillig Exp $
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.
9 # Since DEF is defined, the value of the expression is "value", not
12 .if ${DEF:Dvalue} != "value"
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".
23 .if ${UNDEF:Dvalue} != ""