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directive-undef.mk revision 1.12 
      1 # $NetBSD: directive-undef.mk,v 1.12 2022/03/26 12:44:57 rillig Exp $
      2 #
      3 # Tests for the .undef directive.
      4 #
      5 # See also:
      6 #	directive-misspellings.mk
      7 
      8 # Before var.c 1.737 from 2020-12-19, .undef only undefined the first
      9 # variable, silently skipping all further variable names.
     10 #
     11 # Before var.c 1.761 from 2020-12-22, .undef complained about too many
     12 # arguments.
     13 #
     14 # Since var.c 1.761 from 2020-12-22, .undef handles multiple variable names
     15 # just like the .export directive.
     16 1=		1
     17 2=		2
     18 3=		3
     19 .undef 1 2 3
     20 .if ${1:U_}${2:U_}${3:U_} != ___
     21 .  warning $1$2$3
     22 .endif
     23 
     24 
     25 # Without any arguments, until var.c 1.736 from 2020-12-19, .undef tried
     26 # to delete the variable with the empty name, which never exists; see
     27 # varname-empty.mk.  Since var.c 1.737 from 2020-12-19, .undef complains
     28 # about a missing argument.
     29 .undef
     30 
     31 
     32 # Trying to delete the variable with the empty name is ok, it just won't
     33 # ever do anything since that variable is never defined.
     34 .undef ${:U}
     35 
     36 
     37 # The argument of .undef is first expanded exactly once and then split into
     38 # words, just like everywhere else.  This prevents variables whose names
     39 # contain spaces or unbalanced 'single' or "double" quotes from being
     40 # undefined, but these characters do not appear in variables names anyway.
     41 1=		1
     42 2=		2
     43 3=		3
     44 ${:U1 2 3}=	one two three
     45 VARNAMES=	1 2 3
     46 .undef ${VARNAMES}		# undefines the variables "1", "2" and "3"
     47 .if ${${:U1 2 3}} != "one two three"	# still there
     48 .  error
     49 .endif
     50 .if ${1:U_}${2:U_}${3:U_} != "___"	# these have been undefined
     51 .  error
     52 .endif
     53 
     54 
     55 # A variable named " " cannot be undefined.  There's no practical use case
     56 # for such variables anyway.
     57 SPACE=		${:U }
     58 ${SPACE}=	space
     59 .if !defined(${SPACE})
     60 .  error
     61 .endif
     62 .undef ${SPACE}
     63 .if !defined(${SPACE})
     64 .  error
     65 .endif
     66 
     67 
     68 # A variable named "$" can be undefined since the argument to .undef is
     69 # expanded exactly once, before being split into words.
     70 DOLLAR=		$$
     71 ${DOLLAR}=	dollar
     72 .if !defined(${DOLLAR})
     73 .  error
     74 .endif
     75 .undef ${DOLLAR}
     76 .if defined(${DOLLAR})
     77 .  error
     78 .endif
     79 
     80 
     81 # Since var.c 1.762 from 2020-12-22, parse errors in the argument should be
     82 # properly detected and should stop the .undef directive from doing any work.
     83 #
     84 # As of var.c 1.762, this doesn't happen though because the error handling
     85 # in Var_Parse and Var_Subst is not done properly.
     86 .undef ${VARNAMES:L:Z}
     87 
     88 
     89 UT_EXPORTED=	exported-value
     90 .export UT_EXPORTED
     91 .if ${:!echo "\${UT_EXPORTED:-not-exported}"!} != "exported-value"
     92 .  error
     93 .endif
     94 .if !${.MAKE.EXPORTED:MUT_EXPORTED}
     95 .  error
     96 .endif
     97 .undef UT_EXPORTED		# XXX: does not update .MAKE.EXPORTED
     98 .if ${:!echo "\${UT_EXPORTED:-not-exported}"!} != "not-exported"
     99 .  error
    100 .endif
    101 .if ${.MAKE.EXPORTED:MUT_EXPORTED}
    102 .  warning UT_EXPORTED is still listed in .MAKE.EXPORTED even though $\
    103 	   it is not exported anymore.
    104 .endif
    105 
    106 
    107 # When an exported variable is undefined, the variable is removed both from
    108 # the global scope as well as from the environment.
    109 DIRECT=		direct
    110 INDIRECT=	in-${DIRECT}
    111 .export DIRECT INDIRECT
    112 .if ${DIRECT} != "direct"
    113 .  error
    114 .endif
    115 .if ${INDIRECT} != "in-direct"
    116 .  error
    117 .endif
    118 
    119 # Deletes the variables from the global scope and also from the environment.
    120 # This applies to both variables, even though 'INDIRECT' is not actually
    121 # exported yet since it refers to another variable.
    122 .undef DIRECT			# Separate '.undef' directives,
    123 .undef INDIRECT			# for backwards compatibility.
    124 
    125 .if ${DIRECT:Uundefined} != "undefined"
    126 .  error
    127 .endif
    128 .if ${INDIRECT:Uundefined} != "undefined"
    129 .  error
    130 .endif
    131 
    132 
    133 # Since var.c 1.570 from 2020-10-06 and before var.c 1.1014 from 2022-03-26,
    134 # make ran into an assertion failure when trying to undefine a variable that
    135 # was based on an environment variable.
    136 .if ${ENV_VAR} != "env-value"	# see ./Makefile, ENV.directive-undef
    137 .  error
    138 .endif
    139 ENV_VAR+=	appended	# moves the short-lived variable to the
    140 				# global scope
    141 .undef ENV_VAR			# removes the variable from both the global
    142 				# scope and from the environment
    143 
    144 
    145 all:
    146