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|
# $NetBSD: cond-cmp-string.mk,v 1.14 2021/01/19 19:54:57 rillig Exp $
#
# Tests for string comparisons in .if conditions.
# This is a simple comparison of string literals.
# Nothing surprising here.
.if "str" != "str"
. error
.endif
# The right-hand side of the comparison may be written without quotes.
.if "str" != str
. error
.endif
# The left-hand side of the comparison must be enclosed in quotes.
# This one is not enclosed in quotes and thus generates an error message.
.if str != str
. error
.endif
# The left-hand side of the comparison requires that any variable expression
# is defined.
#
# The variable named "" is never defined, nevertheless it can be used as a
# starting point for variable expressions. Applying the :U modifier to such
# an undefined expression turns it into a defined expression.
#
# See ApplyModifier_Defined and VEF_DEF.
.if ${:Ustr} != "str"
. error
.endif
# Any character in a string literal may be escaped using a backslash.
# This means that "\n" does not mean a newline but a simple "n".
.if "string" != "\s\t\r\i\n\g"
. error
.endif
# It is not possible to concatenate two string literals to form a single
# string. In C, Python and the shell this is possible, but not in make.
.if "string" != "str""ing"
. error
.else
. error
.endif
# There is no = operator for strings.
.if !("value" = "value")
. error
.else
. error
.endif
# There is no === operator for strings either.
.if !("value" === "value")
. error
.else
. error
.endif
# A variable expression can be enclosed in double quotes.
.if ${:Uword} != "${:Uword}"
. error
.endif
# Between 2003-01-01 (maybe even earlier) and 2020-10-30, adding one of the
# characters " \t!=><" directly after a variable expression resulted in a
# "Malformed conditional", even though the string was well-formed.
.if ${:Uword } != "${:Uword} "
. error
.endif
# Some other characters worked though, and some didn't.
# Those that are mentioned in is_separator didn't work.
.if ${:Uword0} != "${:Uword}0"
. error
.endif
.if ${:Uword&} != "${:Uword}&"
. error
.endif
.if ${:Uword!} != "${:Uword}!"
. error
.endif
.if ${:Uword<} != "${:Uword}<"
. error
.endif
# Adding another variable expression to the string literal works though.
.if ${:Uword} != "${:Uwo}${:Urd}"
. error
.endif
# Adding a space at the beginning of the quoted variable expression works
# though.
.if ${:U word } != " ${:Uword} "
. error
.endif
# If at least one side of the comparison is a string literal, the string
# comparison is performed.
.if 12345 != "12345"
. error
.endif
# If at least one side of the comparison is a string literal, the string
# comparison is performed. The ".0" in the left-hand side makes the two
# sides of the equation unequal.
.if 12345.0 == "12345"
. error
.endif
# Strings cannot be compared relationally, only for equality.
.if "string" < "string"
. error
.else
. error
.endif
# Strings cannot be compared relationally, only for equality.
.if "string" <= "string"
. error
.else
. error
.endif
# Strings cannot be compared relationally, only for equality.
.if "string" > "string"
. error
.else
. error
.endif
# Strings cannot be compared relationally, only for equality.
.if "string" >= "string"
. error
.else
. error
.endif
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