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directive-undef.mk revision 1.10 
      1 # $NetBSD: directive-undef.mk,v 1.10 2021/02/16 18:02:19 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 ${VARNAMES}		# undefines the variable "1 2 3"
     47 .if !defined(${:U1 2 3})
     48 .  error
     49 .endif
     50 .if ${1:U_}${2:U_}${3:U_} != "___"	# these are still defined
     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 all:
    108