blob: 80626a279358a7850d9400caa093e8c48dacf599 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
|
# $NetBSD: cond-cmp-unary.mk,v 1.6 2023/11/19 21:47:52 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 in all its various representations evaluates to false.
.if 0 || 0.0 || 0e0 || 0.0e0 || 0.0e10
. 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 an expression.
#
# XXX: As of 2023-06-01, this empty string is interpreted "as a number" in
# EvalTruthy, which is plain wrong. The bug is in TryParseNumber.
.if ${:U}
. error
.endif
# An expression that is not surrounded by quotes is interpreted
# as a number if possible, otherwise as a string.
.if ${:U0}
. error
.endif
# A non-zero number from an expression evaluates to true.
.if !${:U12345}
. error
.endif
# A string of whitespace should evaluate to false.
#
# XXX: As of 2023-06-01, the implementation in EvalTruthy 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 ${:U }
# expect+1: This is only reached because of a bug in EvalTruthy.
. info This is only reached because of a bug in EvalTruthy.
.else
. error
.endif
# The condition '${VAR:M*}' is almost equivalent to '${VAR:M*} != ""'. The
# only case where they differ is for a single word whose numeric value is zero.
.if ${:U0:M*}
. error
.endif
.if ${:U0:M*} == ""
. error
.endif
# Multiple words cannot be parsed as a single number, thus evaluating to true.
.if !${:U0 0:M*}
. error
.endif
.if ${:U0 0:M*} == ""
. error
.endif
all: # nothing
|
