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var-recursive.mk revision 1.8 
      1 # $NetBSD: var-recursive.mk,v 1.8 2024/08/27 04:52:14 rillig Exp $
      2 #
      3 # Tests for expressions that refer to themselves and thus cannot be
      4 # evaluated, as that would lead to an endless loop.
      5 
      6 .if make(loadtime)
      7 
      8 DIRECT=	${DIRECT}	# Defining a recursive variable is not an error.
      9 # expect+2: while evaluating variable "DIRECT" with value "${DIRECT}": Variable DIRECT is recursive.
     10 # expect+1: <>
     11 .  info <${DIRECT}>	# But expanding such a variable is an error.
     12 
     13 
     14 # The chain of variables that refer to each other may be long.
     15 INDIRECT1=	${INDIRECT2}
     16 INDIRECT2=	${INDIRECT1}
     17 # expect+2: while evaluating variable "INDIRECT1" with value "${INDIRECT2}": while evaluating variable "INDIRECT2" with value "${INDIRECT1}": Variable INDIRECT1 is recursive.
     18 # expect+1: <>
     19 .  info <${INDIRECT1}>
     20 
     21 
     22 # The variable refers to itself, but only in the branch of a condition that
     23 # is not satisfied and is thus not evaluated.
     24 CONDITIONAL=	${1:?ok:${CONDITIONAL}}
     25 # expect+1: <ok>
     26 .  info <${CONDITIONAL}>
     27 
     28 
     29 # An expression with modifiers is skipped halfway.  This can lead to wrong
     30 # follow-up error messages, but recursive variables occur seldom.
     31 MODIFIERS=	${MODIFIERS:Mpattern}
     32 # expect+2: while evaluating variable "MODIFIERS" with value "${MODIFIERS:Mpattern}": Variable MODIFIERS is recursive.
     33 # expect+1: <Mpattern}>
     34 .  info <${MODIFIERS}>
     35 
     36 
     37 # Short variable names can be expanded using the short-hand $V notation,
     38 # which takes a different code path in Var_Parse for parsing the variable
     39 # name.  Ensure that these are checked as well.
     40 V=	$V
     41 # expect+2: while evaluating variable "V" with value "$V": Variable V is recursive.
     42 # expect+1: <>
     43 .  info <$V>
     44 
     45 .elif make(runtime)
     46 
     47 # If a recursive variable is accessed in a command of a target, the makefiles
     48 # have already been fully parsed, so there is no location information from the
     49 # .include and .for directives.  In such a case, use the location of the last
     50 # command of the target to provide at least a hint to the location.
     51 VAR=	${VAR}
     52 runtime:
     53 	: OK
     54 # expect: make: in target "runtime": while evaluating variable "VAR" with value "${VAR}": Variable VAR is recursive.
     55 	: <${VAR}>
     56 	: OK
     57 
     58 .else
     59 
     60 all:
     61 	@${MAKE} -f ${MAKEFILE} loadtime || echo "sub-exit status $$?"
     62 	@${MAKE} -f ${MAKEFILE} runtime || echo "sub-exit status $$?"
     63 
     64 .endif
     65