1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
|
# $Id: varmisc.mk,v 1.25 2021/12/07 00:03:11 sjg Exp $
# $NetBSD: varmisc.mk,v 1.32 2021/12/05 10:02:51 rillig Exp $
#
# Miscellaneous variable tests.
all: unmatched_var_paren D_true U_true D_false U_false Q_lhs Q_rhs NQ_none \
strftime cmpv manok
all: save-dollars
all: export-appended
all: parse-dynamic
all: varerror-unclosed
unmatched_var_paren:
@echo ${foo::=foo-text}
True= ${echo true >&2:L:sh}TRUE
False= ${echo false >&2:L:sh}FALSE
VSET= is set
.undef UNDEF
U_false:
@echo :U skipped when var set
@echo ${VSET:U${False}}
D_false:
@echo :D skipped if var undef
@echo ${UNDEF:D${False}}
U_true:
@echo :U expanded when var undef
@echo ${UNDEF:U${True}}
D_true:
@echo :D expanded when var set
@echo ${VSET:D${True}}
Q_lhs:
@echo :? only lhs when value true
@echo ${1:L:?${True}:${False}}
Q_rhs:
@echo :? only rhs when value false
@echo ${0:L:?${True}:${False}}
NQ_none:
@echo do not evaluate or expand :? if discarding
@echo ${VSET:U${1:L:?${True}:${False}}}
April1= 1459494000
# slightly contorted syntax to use utc via variable
strftime:
@echo ${year=%Y month=%m day=%d:L:gmtime=1459494000}
@echo date=${%Y%m%d:L:${gmtime=${April1}:L}}
# big jumps to handle 3 digits per step
M_cmpv.units= 1 1000 1000000
M_cmpv= S,., ,g:_:range:@i@+ $${_:[-$$i]} \* $${M_cmpv.units:[$$i]}@:S,^,expr 0 ,1:sh
Version= 123.456.789
cmpv.only= target specific vars
cmpv:
@echo Version=${Version} == ${Version:${M_cmpv}}
@echo Literal=3.4.5 == ${3.4.5:L:${M_cmpv}}
@echo We have ${${.TARGET:T}.only}
# catch mishandling of nested variables in .for loop
MAN=
MAN1= make.1
.for s in 1 2
. if defined(MAN$s) && !empty(MAN$s)
MAN+= ${MAN$s}
. endif
.endfor
manok:
@echo MAN=${MAN}
# Test parsing of boolean values.
# begin .MAKE.SAVE_DOLLARS; see Var_SetWithFlags and ParseBoolean.
SD_VALUES= 0 1 2 False True false true Yes No yes no On Off ON OFF on off
SD_4_DOLLARS= $$$$
.for val in ${SD_VALUES}
# The assignment must be done using ':=' since a simple '=' would be
# interpreted as 'yes', due to the leading '$'; see ParseBoolean.
.MAKE.SAVE_DOLLARS:= ${val}
SD.${val}:= ${SD_4_DOLLARS}
.endfor
.MAKE.SAVE_DOLLARS:= yes
save-dollars:
.for val in ${SD_VALUES}
@printf '%s: %-8s = %s\n' $@ ${val} ${SD.${val}:Q}
.endfor
# end .MAKE.SAVE_DOLLARS
# Appending to an undefined variable does not add a space in front.
.undef APPENDED
APPENDED+= value
.if ${APPENDED} != "value"
. error "${APPENDED}"
.endif
# Appending to an empty variable adds a space between the old value
# and the additional value.
APPENDED= # empty
APPENDED+= value
.if ${APPENDED} != " value"
. error "${APPENDED}"
.endif
# Appending to parameterized variables works as well.
PARAM= param
VAR.${PARAM}= 1
VAR.${PARAM}+= 2
.if ${VAR.param} != "1 2"
. error "${VAR.param}"
.endif
# The variable name can contain arbitrary characters.
# If the expanded variable name ends in a +, this still does not influence
# the parser. The assignment operator is still a simple assignment.
# Therefore, there is no need to add a space between the variable name
# and the assignment operator.
PARAM= +
VAR.${PARAM}= 1
VAR.${PARAM}+= 2
.if ${VAR.+} != "1 2"
. error "${VAR.+}"
.endif
.for param in + ! ?
VAR.${param}= ${param}
.endfor
.if ${VAR.+} != "+" || ${VAR.!} != "!" || ${VAR.?} != "?"
. error "${VAR.+}" "${VAR.!}" "${VAR.?}"
.endif
# Appending to a variable from the environment creates a copy of that variable
# in the global scope.
# The appended value is not exported automatically.
# When a variable is exported, the exported value is taken at the time of the
# .export directive. Later changes to the variable have no effect.
.export FROM_ENV_BEFORE
FROM_ENV+= mk
FROM_ENV_BEFORE+= mk
FROM_ENV_AFTER+= mk
.export FROM_ENV_AFTER
export-appended:
@echo $@: "$$FROM_ENV"
@echo $@: "$$FROM_ENV_BEFORE"
@echo $@: "$$FROM_ENV_AFTER"
# begin parse-dynamic
#
# Demonstrate that the target-specific variables are not evaluated in
# the global scope. Their expressions are preserved until there is a local
# scope in which resolving them makes sense.
# There are different code paths for short names ...
${:U>}= before
GS_TARGET:= $@
GS_MEMBER:= $%
GS_PREFIX:= $*
GS_ARCHIVE:= $!
GS_ALLSRC:= $>
${:U>}= after
# ... and for braced short names ...
GB_TARGET:= ${@}
GB_MEMBER:= ${%}
GB_PREFIX:= ${*}
GB_ARCHIVE:= ${!}
GB_ALLSRC:= ${>}
# ... and for long names.
GL_TARGET:= ${.TARGET}
GL_MEMBER:= ${.MEMBER}
GL_PREFIX:= ${.PREFIX}
GL_ARCHIVE:= ${.ARCHIVE}
GL_ALLSRC:= ${.ALLSRC}
parse-dynamic:
@echo $@: ${GS_TARGET} ${GS_MEMBER} ${GS_PREFIX} ${GS_ARCHIVE} ${GS_ALLSRC}
@echo $@: ${GB_TARGET} ${GB_MEMBER} ${GB_PREFIX} ${GB_ARCHIVE} ${GB_ALLSRC}
@echo $@: ${GL_TARGET} ${GL_MEMBER} ${GL_PREFIX} ${GL_ARCHIVE} ${GL_ALLSRC}
# Since 2020-07-28, make complains about unclosed variables.
# Before that, it had complained about unclosed variables only when
# parsing the modifiers, but not when parsing the variable name.
UNCLOSED_INDIR_1= ${UNCLOSED_ORIG
UNCLOSED_INDIR_2= ${UNCLOSED_INDIR_1}
FLAGS= one two
FLAGS+= ${FLAGS.${.ALLSRC:M*.c:T:u}}
FLAGS.target2.c= three four
target1.c:
target2.c:
all: target1-flags target2-flags
target1-flags: target1.c
@echo $@: we have: ${FLAGS}
target2-flags: target2.c
@echo $@: we have: ${FLAGS}
varerror-unclosed:
@echo $@:begin
@echo $(
@echo $(UNCLOSED
@echo ${UNCLOSED
@echo ${UNCLOSED:M${PATTERN
@echo ${UNCLOSED.${param
@echo $
.for i in 1 2 3
@echo ${UNCLOSED.${i}
.endfor
@echo ${UNCLOSED_INDIR_2}
@echo $@:end
|
