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# $NetBSD: cmdline-undefined.mk,v 1.5 2024/04/23 22:51:28 rillig Exp $
#
# Tests for undefined variables in expressions in the command line.
all:
# When the command line is parsed, variable assignments using the
# '=' assignment operator do get their variable name expanded
# (which probably occurs rarely in practice, if at all), but their
# variable value is not expanded, as usual.
#
@echo 'The = assignment operator'
@${.MAKE} -f ${MAKEFILE} print-undefined \
CMDLINE='Undefined is $${UNDEFINED}.'
@echo
# The interesting case is using the ':=' assignment operator, which
# expands its right-hand side. But only those variables that are
# defined.
@echo 'The := assignment operator'
@${.MAKE} -f ${MAKEFILE} print-undefined \
CMDLINE:='Undefined is $${UNDEFINED}.'
@echo
.if make(print-undefined)
.MAKEFLAGS: MAKEFLAGS_ASSIGN='Undefined is $${UNDEFINED}.'
.MAKEFLAGS: MAKEFLAGS_SUBST:='Undefined is $${UNDEFINED}.'
# expect+2: From the command line: Undefined is .
# expect+1: From the command line: Undefined is .
.info From the command line: ${CMDLINE}
# expect+2: From .MAKEFLAGS '=': Undefined is .
# expect+1: From .MAKEFLAGS '=': Undefined is .
.info From .MAKEFLAGS '=': ${MAKEFLAGS_ASSIGN}
# expect+2: From .MAKEFLAGS ':=': Undefined is .
# expect+1: From .MAKEFLAGS ':=': Undefined is .
.info From .MAKEFLAGS ':=': ${MAKEFLAGS_SUBST}
UNDEFINED?= now defined
# expect+2: From the command line: Undefined is now defined.
# expect+1: From the command line: Undefined is now defined.
.info From the command line: ${CMDLINE}
# expect+2: From .MAKEFLAGS '=': Undefined is now defined.
# expect+1: From .MAKEFLAGS '=': Undefined is now defined.
.info From .MAKEFLAGS '=': ${MAKEFLAGS_ASSIGN}
# expect+2: From .MAKEFLAGS ':=': Undefined is now defined.
# expect+1: From .MAKEFLAGS ':=': Undefined is now defined.
.info From .MAKEFLAGS ':=': ${MAKEFLAGS_SUBST}
print-undefined:
.endif
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