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# $NetBSD: varmod-shell.mk,v 1.7 2022/01/10 20:32:29 rillig Exp $
#
# Tests for the ':!cmd!' variable modifier, which runs the shell command
# given by the variable modifier and returns its output.
#
# This modifier has been added on 2000-04-29.
#
# See also:
# ApplyModifier_ShellCommand
# The command to be run is enclosed between exclamation marks.
# The previous value of the expression is irrelevant for this modifier.
# The :!cmd! modifier turns an undefined expression into a defined one.
.if ${:!echo word!} != "word"
. error
.endif
# If the command exits with non-zero, an error message is printed.
# XXX: Processing continues as usual though.
#
# Between 2000-04-29 and 2020-11-17, the error message mentioned the previous
# value of the expression (which is usually an empty string) instead of the
# command that was executed.
.if ${:!echo word; false!} != "word"
. error
.endif
.if ${:Uprevious value:!echo word; false!} != "word"
. error
.endif
.MAKEFLAGS: -dv # to see the actual command
_:= ${:!echo word; ${:Ufalse}!}
.MAKEFLAGS: -d0
all:
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