make/unit-tests/varmod-defined.mk

1.3  rillig # $NetBSD: varmod-defined.mk,v 1.3 2020/08/25 21:58:08 rillig Exp $
1.1  rillig #
1.2  rillig # Tests for the :D variable modifier, which returns the given string
1.2  rillig # if the variable is defined.  It is closely related to the :U modifier.
1.1  rillig
1.3  rillig DEF=	defined
1.3  rillig .undef UNDEF
1.3  rillig
1.3  rillig # Since DEF is defined, the value of the expression is "value", not
1.3  rillig # "defined".
1.3  rillig #
1.3  rillig .if ${DEF:Dvalue} != "value"
1.3  rillig .error
1.3  rillig .endif
1.3  rillig
1.3  rillig # Since UNDEF is not defined, the "value" is ignored.  Instead of leaving the
1.3  rillig # expression undefined, it is set to "", exactly to allow the expression to
1.3  rillig # be used in .if conditions.  In this place, other undefined expressions
1.3  rillig # would generate an error message.
1.3  rillig # XXX: Ideally the error message would be "undefined variable", but as of
1.3  rillig # 2020-08-25 it is "Malformed conditional".
1.3  rillig #
1.3  rillig .if ${UNDEF:Dvalue} != ""
1.3  rillig .error
1.3  rillig .endif
1.1  rillig
1.1  rillig all:
1.1  rillig 	@:;