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cond-cmp-string.mk revision 1.18 
      1 # $NetBSD: cond-cmp-string.mk,v 1.18 2023/11/19 21:47:52 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 # expect+1: Malformed conditional (str != str)
     19 .if str != str
     20 .  error
     21 .endif
     22 
     23 # The left-hand side of the comparison requires that any expression
     24 # is defined.
     25 #
     26 # The variable named "" is never defined, nevertheless it can be used as a
     27 # starting point for expressions.  Applying the :U modifier to such
     28 # an undefined expression turns it into a defined expression.
     29 #
     30 # See ApplyModifier_Defined and DEF_DEFINED.
     31 .if ${:Ustr} != "str"
     32 .  error
     33 .endif
     34 
     35 # Any character in a string literal may be escaped using a backslash.
     36 # This means that "\n" does not mean a newline but a simple "n".
     37 .if "string" != "\s\t\r\i\n\g"
     38 .  error
     39 .endif
     40 
     41 # It is not possible to concatenate two string literals to form a single
     42 # string.  In C, Python and the shell this is possible, but not in make.
     43 # expect+1: Malformed conditional ("string" != "str""ing")
     44 .if "string" != "str""ing"
     45 .  error
     46 .else
     47 .  error
     48 .endif
     49 
     50 # There is no = operator for strings.
     51 # expect+1: Malformed conditional (!("value" = "value"))
     52 .if !("value" = "value")
     53 .  error
     54 .else
     55 .  error
     56 .endif
     57 
     58 # There is no === operator for strings either.
     59 # expect+1: Malformed conditional (!("value" === "value"))
     60 .if !("value" === "value")
     61 .  error
     62 .else
     63 .  error
     64 .endif
     65 
     66 # An expression can be enclosed in double quotes.
     67 .if ${:Uword} != "${:Uword}"
     68 .  error
     69 .endif
     70 
     71 # Between 2003-01-01 (maybe even earlier) and 2020-10-30, adding one of the
     72 # characters " \t!=><" directly after an expression resulted in a
     73 # "Malformed conditional", even though the string was well-formed.
     74 .if ${:Uword } != "${:Uword} "
     75 .  error
     76 .endif
     77 # Some other characters worked though, and some didn't.
     78 # Those that are mentioned in is_separator didn't work.
     79 .if ${:Uword0} != "${:Uword}0"
     80 .  error
     81 .endif
     82 .if ${:Uword&} != "${:Uword}&"
     83 .  error
     84 .endif
     85 .if ${:Uword!} != "${:Uword}!"
     86 .  error
     87 .endif
     88 .if ${:Uword<} != "${:Uword}<"
     89 .  error
     90 .endif
     91 
     92 # Adding another expression to the string literal works though.
     93 .if ${:Uword} != "${:Uwo}${:Urd}"
     94 .  error
     95 .endif
     96 
     97 # Adding a space at the beginning of the quoted expression works
     98 # though.
     99 .if ${:U word } != " ${:Uword} "
    100 .  error
    101 .endif
    102 
    103 # If at least one side of the comparison is a string literal, the string
    104 # comparison is performed.
    105 .if 12345 != "12345"
    106 .  error
    107 .endif
    108 
    109 # If at least one side of the comparison is a string literal, the string
    110 # comparison is performed.  The ".0" in the left-hand side makes the two
    111 # sides of the equation unequal.
    112 .if 12345.0 == "12345"
    113 .  error
    114 .endif
    115 
    116 # Strings cannot be compared relationally, only for equality.
    117 # expect+1: Comparison with '<' requires both operands 'string' and 'string' to be numeric
    118 .if "string" < "string"
    119 .  error
    120 .else
    121 .  error
    122 .endif
    123 
    124 # Strings cannot be compared relationally, only for equality.
    125 # expect+1: Comparison with '<=' requires both operands 'string' and 'string' to be numeric
    126 .if "string" <= "string"
    127 .  error
    128 .else
    129 .  error
    130 .endif
    131 
    132 # Strings cannot be compared relationally, only for equality.
    133 # expect+1: Comparison with '>' requires both operands 'string' and 'string' to be numeric
    134 .if "string" > "string"
    135 .  error
    136 .else
    137 .  error
    138 .endif
    139 
    140 # Strings cannot be compared relationally, only for equality.
    141 # expect+1: Comparison with '>=' requires both operands 'string' and 'string' to be numeric
    142 .if "string" >= "string"
    143 .  error
    144 .else
    145 .  error
    146 .endif
    147 
    148 # Two variables with different values compare unequal.
    149 VAR1=	value1
    150 VAR2=	value2
    151 .if ${VAR1} != ${VAR2}
    152 .else
    153 .  error
    154 .endif
    155