63 lines
1.3 KiB
Makefile
63 lines
1.3 KiB
Makefile
# $Id: varmisc.mk,v 1.9 2017/02/01 18:44:54 sjg Exp $
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#
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# Miscellaneous variable tests.
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all: unmatched_var_paren D_true U_true D_false U_false Q_lhs Q_rhs NQ_none \
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strftime cmpv
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unmatched_var_paren:
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@echo ${foo::=foo-text}
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True = ${echo true >&2:L:sh}TRUE
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False= ${echo false >&2:L:sh}FALSE
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VSET= is set
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.undef UNDEF
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U_false:
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@echo :U skipped when var set
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@echo ${VSET:U${False}}
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D_false:
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@echo :D skipped if var undef
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@echo ${UNDEF:D${False}}
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U_true:
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@echo :U expanded when var undef
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@echo ${UNDEF:U${True}}
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D_true:
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@echo :D expanded when var set
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@echo ${VSET:D${True}}
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Q_lhs:
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@echo :? only lhs when value true
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@echo ${1:L:?${True}:${False}}
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Q_rhs:
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@echo :? only rhs when value false
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@echo ${0:L:?${True}:${False}}
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NQ_none:
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@echo do not evaluate or expand :? if discarding
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@echo ${VSET:U${1:L:?${True}:${False}}}
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April1= 1459494000
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# slightly contorted syntax to use utc via variable
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strftime:
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@echo ${year=%Y month=%m day=%d:L:gmtime=1459494000}
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@echo date=${%Y%m%d:L:${gmtime=${April1}:L}}
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# big jumps to handle 3 digits per step
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M_cmpv.units = 1 1000 1000000
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M_cmpv = S,., ,g:_:range:@i@+ $${_:[-$$i]} \* $${M_cmpv.units:[$$i]}@:S,^,expr 0 ,1:sh
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Version = 123.456.789
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cmpv.only = target specific vars
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cmpv:
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@echo Version=${Version} == ${Version:${M_cmpv}}
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@echo Literal=3.4.5 == ${3.4.5:L:${M_cmpv}}
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@echo We have ${${.TARGET:T}.only}
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