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cond-cmp-string.mk revision 1.13 
      1 # $NetBSD: cond-cmp-string.mk,v 1.13 2020/11/15 14:07:53 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 VEF_DEF.
     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