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      1  1.6  rillig # $NetBSD: cmdline-undefined.mk,v 1.6 2025/06/30 21:44:39 rillig Exp $
      2  1.1  rillig #
      3  1.5  rillig # Tests for undefined variables in expressions in the command line.
      4  1.1  rillig 
      5  1.1  rillig all:
      6  1.2  rillig 	# When the command line is parsed, variable assignments using the
      7  1.2  rillig 	# '=' assignment operator do get their variable name expanded
      8  1.2  rillig 	# (which probably occurs rarely in practice, if at all), but their
      9  1.2  rillig 	# variable value is not expanded, as usual.
     10  1.2  rillig 	#
     11  1.6  rillig # expect+30: From the command line: Undefined is .
     12  1.6  rillig # expect+30: From .MAKEFLAGS '=': Undefined is .
     13  1.6  rillig # expect+30: From .MAKEFLAGS ':=': Undefined is .
     14  1.6  rillig # expect+33: From the command line: Undefined is now defined.
     15  1.6  rillig # expect+33: From .MAKEFLAGS '=': Undefined is now defined.
     16  1.6  rillig # expect+33: From .MAKEFLAGS ':=': Undefined is now defined.
     17  1.1  rillig 	@echo 'The = assignment operator'
     18  1.1  rillig 	@${.MAKE} -f ${MAKEFILE} print-undefined \
     19  1.1  rillig 		CMDLINE='Undefined is $${UNDEFINED}.'
     20  1.1  rillig 	@echo
     21  1.1  rillig 
     22  1.1  rillig 	# The interesting case is using the ':=' assignment operator, which
     23  1.1  rillig 	# expands its right-hand side.  But only those variables that are
     24  1.1  rillig 	# defined.
     25  1.6  rillig # expect+16: From the command line: Undefined is .
     26  1.6  rillig # expect+16: From .MAKEFLAGS '=': Undefined is .
     27  1.6  rillig # expect+16: From .MAKEFLAGS ':=': Undefined is .
     28  1.6  rillig # expect+19: From the command line: Undefined is now defined.
     29  1.6  rillig # expect+19: From .MAKEFLAGS '=': Undefined is now defined.
     30  1.6  rillig # expect+19: From .MAKEFLAGS ':=': Undefined is now defined.
     31  1.1  rillig 	@echo 'The := assignment operator'
     32  1.1  rillig 	@${.MAKE} -f ${MAKEFILE} print-undefined \
     33  1.1  rillig 		CMDLINE:='Undefined is $${UNDEFINED}.'
     34  1.1  rillig 	@echo
     35  1.1  rillig 
     36  1.1  rillig .if make(print-undefined)
     37  1.1  rillig 
     38  1.1  rillig .MAKEFLAGS: MAKEFLAGS_ASSIGN='Undefined is $${UNDEFINED}.'
     39  1.1  rillig .MAKEFLAGS: MAKEFLAGS_SUBST:='Undefined is $${UNDEFINED}.'
     40  1.1  rillig 
     41  1.1  rillig .info From the command line: ${CMDLINE}
     42  1.1  rillig .info From .MAKEFLAGS '=': ${MAKEFLAGS_ASSIGN}
     43  1.1  rillig .info From .MAKEFLAGS ':=': ${MAKEFLAGS_SUBST}
     44  1.1  rillig 
     45  1.1  rillig UNDEFINED?=	now defined
     46  1.1  rillig 
     47  1.1  rillig .info From the command line: ${CMDLINE}
     48  1.1  rillig .info From .MAKEFLAGS '=': ${MAKEFLAGS_ASSIGN}
     49  1.1  rillig .info From .MAKEFLAGS ':=': ${MAKEFLAGS_SUBST}
     50  1.1  rillig 
     51  1.1  rillig print-undefined:
     52  1.1  rillig .endif
     53