146 lines
3.9 KiB
Makefile
146 lines
3.9 KiB
Makefile
# $NetBSD: directive-undef.mk,v 1.12 2022/03/26 12:44:57 rillig Exp $
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#
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# Tests for the .undef directive.
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#
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# See also:
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# directive-misspellings.mk
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# Before var.c 1.737 from 2020-12-19, .undef only undefined the first
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# variable, silently skipping all further variable names.
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#
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# Before var.c 1.761 from 2020-12-22, .undef complained about too many
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# arguments.
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#
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# Since var.c 1.761 from 2020-12-22, .undef handles multiple variable names
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# just like the .export directive.
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1= 1
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2= 2
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3= 3
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.undef 1 2 3
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.if ${1:U_}${2:U_}${3:U_} != ___
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. warning $1$2$3
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.endif
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# Without any arguments, until var.c 1.736 from 2020-12-19, .undef tried
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# to delete the variable with the empty name, which never exists; see
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# varname-empty.mk. Since var.c 1.737 from 2020-12-19, .undef complains
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# about a missing argument.
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.undef
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# Trying to delete the variable with the empty name is ok, it just won't
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# ever do anything since that variable is never defined.
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.undef ${:U}
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# The argument of .undef is first expanded exactly once and then split into
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# words, just like everywhere else. This prevents variables whose names
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# contain spaces or unbalanced 'single' or "double" quotes from being
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# undefined, but these characters do not appear in variables names anyway.
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1= 1
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2= 2
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3= 3
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${:U1 2 3}= one two three
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VARNAMES= 1 2 3
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.undef ${VARNAMES} # undefines the variables "1", "2" and "3"
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.if ${${:U1 2 3}} != "one two three" # still there
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. error
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.endif
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.if ${1:U_}${2:U_}${3:U_} != "___" # these have been undefined
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. error
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.endif
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# A variable named " " cannot be undefined. There's no practical use case
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# for such variables anyway.
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SPACE= ${:U }
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${SPACE}= space
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.if !defined(${SPACE})
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. error
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.endif
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.undef ${SPACE}
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.if !defined(${SPACE})
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. error
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.endif
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# A variable named "$" can be undefined since the argument to .undef is
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# expanded exactly once, before being split into words.
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DOLLAR= $$
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${DOLLAR}= dollar
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.if !defined(${DOLLAR})
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. error
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.endif
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.undef ${DOLLAR}
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.if defined(${DOLLAR})
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. error
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.endif
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# Since var.c 1.762 from 2020-12-22, parse errors in the argument should be
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# properly detected and should stop the .undef directive from doing any work.
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#
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# As of var.c 1.762, this doesn't happen though because the error handling
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# in Var_Parse and Var_Subst is not done properly.
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.undef ${VARNAMES:L:Z}
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UT_EXPORTED= exported-value
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.export UT_EXPORTED
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.if ${:!echo "\${UT_EXPORTED:-not-exported}"!} != "exported-value"
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. error
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.endif
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.if !${.MAKE.EXPORTED:MUT_EXPORTED}
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. error
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.endif
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.undef UT_EXPORTED # XXX: does not update .MAKE.EXPORTED
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.if ${:!echo "\${UT_EXPORTED:-not-exported}"!} != "not-exported"
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. error
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.endif
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.if ${.MAKE.EXPORTED:MUT_EXPORTED}
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. warning UT_EXPORTED is still listed in .MAKE.EXPORTED even though $\
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it is not exported anymore.
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.endif
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# When an exported variable is undefined, the variable is removed both from
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# the global scope as well as from the environment.
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DIRECT= direct
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INDIRECT= in-${DIRECT}
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.export DIRECT INDIRECT
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.if ${DIRECT} != "direct"
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. error
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.endif
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.if ${INDIRECT} != "in-direct"
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. error
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.endif
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# Deletes the variables from the global scope and also from the environment.
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# This applies to both variables, even though 'INDIRECT' is not actually
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# exported yet since it refers to another variable.
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.undef DIRECT # Separate '.undef' directives,
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.undef INDIRECT # for backwards compatibility.
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.if ${DIRECT:Uundefined} != "undefined"
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. error
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.endif
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.if ${INDIRECT:Uundefined} != "undefined"
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. error
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.endif
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# Since var.c 1.570 from 2020-10-06 and before var.c 1.1014 from 2022-03-26,
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# make ran into an assertion failure when trying to undefine a variable that
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# was based on an environment variable.
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.if ${ENV_VAR} != "env-value" # see ./Makefile, ENV.directive-undef
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. error
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.endif
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ENV_VAR+= appended # moves the short-lived variable to the
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# global scope
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.undef ENV_VAR # removes the variable from both the global
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# scope and from the environment
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all:
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