1 # $NetBSD: cond-cmp-string.mk,v 1.13 2020/11/15 14:07:53 rillig Exp $
3 # Tests for string comparisons in .if conditions.
5 # This is a simple comparison of string literals.
6 # Nothing surprising here.
11 # The right-hand side of the comparison may be written without quotes.
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.
22 # The left-hand side of the comparison requires that any variable expression
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.
29 # See ApplyModifier_Defined and VEF_DEF.
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"
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"
48 # There is no = operator for strings.
49 .if !("value" = "value")
55 # There is no === operator for strings either.
56 .if !("value" === "value")
62 # A variable expression can be enclosed in double quotes.
63 .if ${:Uword} != "${:Uword}"
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} "
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"
78 .if ${:Uword&} != "${:Uword}&"
81 .if ${:Uword!} != "${:Uword}!"
84 .if ${:Uword<} != "${:Uword}<"
88 # Adding another variable expression to the string literal works though.
89 .if ${:Uword} != "${:Uwo}${:Urd}"
93 # Adding a space at the beginning of the quoted variable expression works
95 .if ${:U word } != " ${:Uword} "
99 # If at least one side of the comparison is a string literal, the string
100 # comparison is performed.
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"