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. 161= 1 172= 2 183= 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 ${:U} 35 36 37# The argument of .undef is first expanded exactly once and then split into 38# words, just like everywhere else. This prevents variables whose names 39# contain spaces or unbalanced 'single' or "double" quotes from being 40# undefined, but these characters do not appear in variables names anyway. 411= 1 422= 2 433= 3 44${:U1 2 3}= one two three 45VARNAMES= 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. 57SPACE= ${:U } 58${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. 70DOLLAR= $$ 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 89UT_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 $\ 103 it is not exported anymore. 104.endif 105 106 107# When an exported variable is undefined, the variable is removed both from 108# the global scope as well as from the environment. 109DIRECT= direct 110INDIRECT= in-${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 139ENV_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 145all: 146