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# $NetBSD: cond-cmp-unary.mk,v 1.2 2020/11/11 07:30:11 rillig Exp $
#
# Tests for unary comparisons in .if conditions, that is, comparisons with
# a single operand. If the operand is a number, it is compared to zero,
# if it is a string, it is tested for emptiness.
# The number 0 evaluates to false.
.if 0
. error
.endif
# Any other number evaluates to true.
.if !12345
. error
.endif
# The empty string evaluates to false.
.if ""
. error
.endif
# Any other string evaluates to true.
.if !"0"
. error
.endif
# The empty string may come from a variable expression.
#
# XXX: As of 2020-11-11, this empty string is interpreted "as a number" in
# EvalNotEmpty, which is plain wrong. The bug is in TryParseNumber.
.if ${:U}
. error
.endif
# A variable expression that is not surrounded by quotes is interpreted
# as a number if possible, otherwise as a string.
.if ${:U0}
. error
.endif
# A non-zero number from a variable expression evaluates to true.
.if !${:U12345}
. error
.endif
# A string of whitespace should evaluate to false.
#
# XXX: As of 2020-11-11, the implementation in EvalNotEmpty does not skip
# whitespace before testing for the end. This was probably an oversight in
# a commit from 1992-04-15 saying "A variable is empty when it just contains
# spaces".
.if ${:U }
. info This is only reached because of a bug in EvalNotEmpty.
.else
. error
.endif
all: # nothing
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