1# $NetBSD: cond-cmp-string.mk,v 1.16 2022/05/08 06:51:27 rillig Exp $
2#
3# Tests for string comparisons in .if conditions.
4
5# This is a simple comparison of string literals.
6# Nothing surprising here.
7.if "str" != "str"
8.  error
9.endif
10
11# The right-hand side of the comparison may be written without quotes.
12.if "str" != str
13.  error
14.endif
15
16# The left-hand side of the comparison must be enclosed in quotes.
17# This one is not enclosed in quotes and thus generates an error message.
18.if str != str
19.  error
20.endif
21
22# The left-hand side of the comparison requires that any variable expression
23# is defined.
24#
25# The variable named "" is never defined, nevertheless it can be used as a
26# starting point for variable expressions.  Applying the :U modifier to such
27# an undefined expression turns it into a defined expression.
28#
29# See ApplyModifier_Defined and DEF_DEFINED.
30.if ${:Ustr} != "str"
31.  error
32.endif
33
34# Any character in a string literal may be escaped using a backslash.
35# This means that "\n" does not mean a newline but a simple "n".
36.if "string" != "\s\t\r\i\n\g"
37.  error
38.endif
39
40# It is not possible to concatenate two string literals to form a single
41# string.  In C, Python and the shell this is possible, but not in make.
42.if "string" != "str""ing"
43.  error
44.else
45.  error
46.endif
47
48# There is no = operator for strings.
49.if !("value" = "value")
50.  error
51.else
52.  error
53.endif
54
55# There is no === operator for strings either.
56.if !("value" === "value")
57.  error
58.else
59.  error
60.endif
61
62# A variable expression can be enclosed in double quotes.
63.if ${:Uword} != "${:Uword}"
64.  error
65.endif
66
67# Between 2003-01-01 (maybe even earlier) and 2020-10-30, adding one of the
68# characters " \t!=><" directly after a variable expression resulted in a
69# "Malformed conditional", even though the string was well-formed.
70.if ${:Uword } != "${:Uword} "
71.  error
72.endif
73# Some other characters worked though, and some didn't.
74# Those that are mentioned in is_separator didn't work.
75.if ${:Uword0} != "${:Uword}0"
76.  error
77.endif
78.if ${:Uword&} != "${:Uword}&"
79.  error
80.endif
81.if ${:Uword!} != "${:Uword}!"
82.  error
83.endif
84.if ${:Uword<} != "${:Uword}<"
85.  error
86.endif
87
88# Adding another variable expression to the string literal works though.
89.if ${:Uword} != "${:Uwo}${:Urd}"
90.  error
91.endif
92
93# Adding a space at the beginning of the quoted variable expression works
94# though.
95.if ${:U word } != " ${:Uword} "
96.  error
97.endif
98
99# If at least one side of the comparison is a string literal, the string
100# comparison is performed.
101.if 12345 != "12345"
102.  error
103.endif
104
105# If at least one side of the comparison is a string literal, the string
106# comparison is performed.  The ".0" in the left-hand side makes the two
107# sides of the equation unequal.
108.if 12345.0 == "12345"
109.  error
110.endif
111
112# Strings cannot be compared relationally, only for equality.
113.if "string" < "string"
114.  error
115.else
116.  error
117.endif
118
119# Strings cannot be compared relationally, only for equality.
120.if "string" <= "string"
121.  error
122.else
123.  error
124.endif
125
126# Strings cannot be compared relationally, only for equality.
127.if "string" > "string"
128.  error
129.else
130.  error
131.endif
132
133# Strings cannot be compared relationally, only for equality.
134.if "string" >= "string"
135.  error
136.else
137.  error
138.endif
139
140# Two variables with different values compare unequal.
141VAR1=	value1
142VAR2=	value2
143.if ${VAR1} != ${VAR2}
144.else
145.  error
146.endif
147