mirror of
https://github.com/freebsd/freebsd-src
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945078deae
Relevant/interesting changes:
o parse.c: don't print null filename in stack traces
o for.c: skip syntactically wrong .for loops
o var.c: allow for :gmtime=${mtime}
add :mtime[=timestamp] where timestamp is used if stat(2)
fails, if :mtime=error stat(2) failure causes error.
o make.1: fix documentation of .PREFIX to match reality and POSIX
o unit-tests: improved var-scope-local
37 lines
1.2 KiB
Makefile
37 lines
1.2 KiB
Makefile
# $NetBSD: cond-late.mk,v 1.4 2023/05/10 15:53:32 rillig Exp $
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#
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# Using the :? modifier, variable expressions can contain conditional
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# expressions that are evaluated late, at expansion time.
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#
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# Any expressions appearing in these conditions are expanded before parsing
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# the condition. This is different from conditions in .if directives, where
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# expressions are evaluated individually and only as far as necessary, see
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# cond-short.mk.
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#
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# Because of this, variables that are used in these lazy conditions
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# should not contain double-quotes, or the parser will probably fail.
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#
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# They should also not contain operators like == or <, since these are
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# actually interpreted as these operators. This is demonstrated below.
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#
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all: cond-literal
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COND.true= "yes" == "yes"
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COND.false= "yes" != "yes"
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# If the order of evaluation were to change to first parse the condition
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# and then expand the variables, the output would change from the
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# current "yes no" to "yes yes", since both variables are non-empty.
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# expect: yes
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# expect: no
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cond-literal:
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@echo ${ ${COND.true} :?yes:no}
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@echo ${ ${COND.false} :?yes:no}
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VAR= ${${UNDEF} != "no":?:}
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# expect-reset
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# expect: make: Bad conditional expression ' != "no"' in ' != "no"?:'
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.if empty(VAR:Mpattern)
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.endif
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