1 # $Id: varmisc.mk,v 1.19 2020/08/31 16:28:10 sjg Exp $
3 # Miscellaneous variable tests.
5 all: unmatched_var_paren D_true U_true D_false U_false Q_lhs Q_rhs NQ_none \
10 all: varerror-unclosed
13 @echo ${foo::=foo-text}
15 True = ${echo true >&2:L:sh}TRUE
16 False= ${echo false >&2:L:sh}FALSE
22 @echo :U skipped when var set
23 @echo ${VSET:U${False}}
26 @echo :D skipped if var undef
27 @echo ${UNDEF:D${False}}
30 @echo :U expanded when var undef
31 @echo ${UNDEF:U${True}}
34 @echo :D expanded when var set
35 @echo ${VSET:D${True}}
38 @echo :? only lhs when value true
39 @echo ${1:L:?${True}:${False}}
42 @echo :? only rhs when value false
43 @echo ${0:L:?${True}:${False}}
46 @echo do not evaluate or expand :? if discarding
47 @echo ${VSET:U${1:L:?${True}:${False}}}
51 # slightly contorted syntax to use utc via variable
53 @echo ${year=%Y month=%m day=%d:L:gmtime=1459494000}
54 @echo date=${%Y%m%d:L:${gmtime=${April1}:L}}
56 # big jumps to handle 3 digits per step
57 M_cmpv.units = 1 1000 1000000
58 M_cmpv = S,., ,g:_:range:@i@+ $${_:[-$$i]} \* $${M_cmpv.units:[$$i]}@:S,^,expr 0 ,1:sh
61 cmpv.only = target specific vars
64 @echo Version=${Version} == ${Version:${M_cmpv}}
65 @echo Literal=3.4.5 == ${3.4.5:L:${M_cmpv}}
66 @echo We have ${${.TARGET:T}.only}
68 # catch misshandling of nested vars in .for loop
72 .if defined(MAN$s) && !empty(MAN$s)
80 # This is an expanded variant of the above .for loop.
81 # Between 2020-06-28 and 2020-07-02 this paragraph generated a wrong
82 # error message "Variable VARNAME is recursive".
83 # When evaluating the !empty expression, the ${:U1} was not expanded and
84 # thus resulted in the seeming definition VARNAME=${VARNAME}, which is
85 # obviously recursive.
86 VARNAME= ${VARNAME${:U1}}
87 .if defined(VARNAME${:U2}) && !empty(VARNAME${:U2})
90 # begin .MAKE.SAVE_DOLLARS; see Var_Set_with_flags and s2Boolean.
91 SD_VALUES= 0 1 2 False True false true Yes No yes no On Off ON OFF on off
94 .for val in ${SD_VALUES}
95 .MAKE.SAVE_DOLLARS:= ${val} # Must be := since a simple = has no effect.
96 SD.${val}:= ${SD_4_DOLLARS}
98 .MAKE.SAVE_DOLLARS:= yes
101 .for val in ${SD_VALUES}
102 @printf '%s: %-8s = %s\n' $@ ${val} ${SD.${val}:Q}
105 # Appending to an undefined variable does not add a space in front.
108 .if ${APPENDED} != "value"
112 # Appending to an empty variable adds a space between the old value
113 # and the additional value.
116 .if ${APPENDED} != " value"
120 # Appending to parameterized variables works as well.
124 .if ${VAR.param} != "1 2"
125 .error "${VAR.param}"
128 # The variable name can contain arbitrary characters.
129 # If the expanded variable name ends in a +, this still does not influence
130 # the parser. The assignment operator is still a simple assignment.
131 # Therefore, there is no need to add a space between the variable name
132 # and the assignment operator.
136 .if ${VAR.+} != "1 2"
140 VAR.${param}= ${param}
142 .if ${VAR.+} != "+" || ${VAR.!} != "!" || ${VAR.?} != "?"
143 .error "${VAR.+}" "${VAR.!}" "${VAR.?}"
146 # Appending to a variable from the environment creates a copy of that variable
147 # in the global context.
148 # The appended value is not exported automatically.
149 # When a variable is exported, the exported value is taken at the time of the
150 # .export directive. Later changes to the variable have no effect.
151 .export FROM_ENV_BEFORE
155 .export FROM_ENV_AFTER
158 @echo $@: "$$FROM_ENV"
159 @echo $@: "$$FROM_ENV_BEFORE"
160 @echo $@: "$$FROM_ENV_AFTER"
162 # begin parse-dynamic
164 # Demonstrate that the target-specific variables are not evaluated in
165 # the global context. They are preserved until there is a local context
166 # in which resolving them makes sense.
168 # There are different code paths for short names ...
176 # ... and for braced short names ...
182 # ... and for long names.
183 GL_TARGET:= ${.TARGET}
184 GL_MEMBER:= ${.MEMBER}
185 GL_PREFIX:= ${.PREFIX}
186 GL_ARCHIVE:= ${.ARCHIVE}
187 GL_ALLSRC:= ${.ALLSRC}
190 @echo $@: ${GS_TARGET} ${GS_MEMBER} ${GS_PREFIX} ${GS_ARCHIVE} ${GS_ALLSRC}
191 @echo $@: ${GB_TARGET} ${GB_MEMBER} ${GB_PREFIX} ${GB_ARCHIVE} ${GB_ALLSRC}
192 @echo $@: ${GL_TARGET} ${GL_MEMBER} ${GL_PREFIX} ${GL_ARCHIVE} ${GL_ALLSRC}
194 # Since 2020-07-28, make complains about unclosed variables.
195 # Before that, it had complained about unclosed variables only when
196 # parsing the modifiers, but not when parsing the variable name.
198 UNCLOSED_INDIR_1= ${UNCLOSED_ORIG
199 UNCLOSED_INDIR_2= ${UNCLOSED_INDIR_1}
202 FLAGS+= ${FLAGS.${.ALLSRC:M*.c:T:u}}
203 FLAGS.target2.c = three four
208 all: target1-flags target2-flags
209 target1-flags: target1.c
210 @echo $@: we have: ${FLAGS}
212 target2-flags: target2.c
213 @echo $@: we have: ${FLAGS}
220 @echo ${UNCLOSED:M${PATTERN
221 @echo ${UNCLOSED.${param
224 @echo ${UNCLOSED.${i}
226 @echo ${UNCLOSED_INDIR_2}