36 lines
1.2 KiB
Makefile
36 lines
1.2 KiB
Makefile
# $NetBSD: varmod-remember.mk,v 1.6 2021/03/14 17:27:27 rillig Exp $
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#
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# Tests for the :_ modifier, which saves the current variable value
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# in the _ variable or another, to be used later again.
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.if ${1 2 3:L:_:@var@${_}@} != "1 2 3 1 2 3 1 2 3"
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. error
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.endif
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# In the parameterized form, having the variable name on the right side of
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# the = assignment operator is confusing. In almost all other situations
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# the variable name is on the left-hand side of the = operator. Luckily
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# this modifier is only rarely needed.
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.if ${1 2 3:L:@var@${var:_=SAVED:}@} != "1 2 3"
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. error
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.elif ${SAVED} != "3"
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. error
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.endif
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# The ':_' modifier takes a variable name as optional argument. This variable
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# name can refer to other variables, though this was rather an implementation
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# oversight than an intended feature. The variable name stops at the first
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# '}' or ')' and thus cannot use the usual form ${VARNAME} of long variable
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# names.
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#
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# Because of all these edge-casey conditions, this "feature" has been removed
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# in var.c 1.867 from 2021-03-14.
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S= INDIRECT_VARNAME
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.if ${value:L:@var@${var:_=$S}@} != "value"
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. error
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.elif defined(INDIRECT_VARNAME)
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. error
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.endif
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all:
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