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cmdline-undefined.mk revision 1.6 
      1 # $NetBSD: cmdline-undefined.mk,v 1.6 2025/06/30 21:44:39 rillig Exp $
      2 #
      3 # Tests for undefined variables in expressions in the command line.
      4 
      5 all:
      6 	# When the command line is parsed, variable assignments using the
      7 	# '=' assignment operator do get their variable name expanded
      8 	# (which probably occurs rarely in practice, if at all), but their
      9 	# variable value is not expanded, as usual.
     10 	#
     11 # expect+30: From the command line: Undefined is .
     12 # expect+30: From .MAKEFLAGS '=': Undefined is .
     13 # expect+30: From .MAKEFLAGS ':=': Undefined is .
     14 # expect+33: From the command line: Undefined is now defined.
     15 # expect+33: From .MAKEFLAGS '=': Undefined is now defined.
     16 # expect+33: From .MAKEFLAGS ':=': Undefined is now defined.
     17 	@echo 'The = assignment operator'
     18 	@${.MAKE} -f ${MAKEFILE} print-undefined \
     19 		CMDLINE='Undefined is $${UNDEFINED}.'
     20 	@echo
     21 
     22 	# The interesting case is using the ':=' assignment operator, which
     23 	# expands its right-hand side.  But only those variables that are
     24 	# defined.
     25 # expect+16: From the command line: Undefined is .
     26 # expect+16: From .MAKEFLAGS '=': Undefined is .
     27 # expect+16: From .MAKEFLAGS ':=': Undefined is .
     28 # expect+19: From the command line: Undefined is now defined.
     29 # expect+19: From .MAKEFLAGS '=': Undefined is now defined.
     30 # expect+19: From .MAKEFLAGS ':=': Undefined is now defined.
     31 	@echo 'The := assignment operator'
     32 	@${.MAKE} -f ${MAKEFILE} print-undefined \
     33 		CMDLINE:='Undefined is $${UNDEFINED}.'
     34 	@echo
     35 
     36 .if make(print-undefined)
     37 
     38 .MAKEFLAGS: MAKEFLAGS_ASSIGN='Undefined is $${UNDEFINED}.'
     39 .MAKEFLAGS: MAKEFLAGS_SUBST:='Undefined is $${UNDEFINED}.'
     40 
     41 .info From the command line: ${CMDLINE}
     42 .info From .MAKEFLAGS '=': ${MAKEFLAGS_ASSIGN}
     43 .info From .MAKEFLAGS ':=': ${MAKEFLAGS_SUBST}
     44 
     45 UNDEFINED?=	now defined
     46 
     47 .info From the command line: ${CMDLINE}
     48 .info From .MAKEFLAGS '=': ${MAKEFLAGS_ASSIGN}
     49 .info From .MAKEFLAGS ':=': ${MAKEFLAGS_SUBST}
     50 
     51 print-undefined:
     52 .endif
     53