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cond-token-string.mk revision 1.6 
      1 # $NetBSD: cond-token-string.mk,v 1.6 2022/05/08 06:57:00 rillig Exp $
      2 #
      3 # Tests for quoted string literals in .if conditions.
      4 #
      5 # See also:
      6 #	cond-token-plain.mk
      7 #		Covers string literals without quotes (called "bare words").
      8 
      9 # TODO: Implementation
     10 
     11 # Cover the code in CondParser_String that frees the memory after parsing
     12 # a variable expression based on an undefined variable.
     13 .if "" != "${:Uvalue:Z}"
     14 .  error
     15 .else
     16 .  error
     17 .endif
     18 
     19 .if x${:Uvalue}
     20 .  error
     21 .else
     22 .  info xvalue is not defined.
     23 .endif
     24 
     25 # The 'x' produces a "Malformed conditional" since the left-hand side of a
     26 # comparison in an .if directive must be either a variable expression, a
     27 # quoted string literal or a number that starts with a digit.
     28 .if x${:Uvalue} == ""
     29 .  error
     30 .else
     31 .  error
     32 .endif
     33 
     34 # In plain words, a '\' can be used to escape any character, just as in
     35 # double-quoted string literals.  See CondParser_String.
     36 .if \x${:Uvalue} == "xvalue"
     37 .  info Expected.
     38 .else
     39 .  error
     40 .endif
     41 
     42 .MAKEFLAGS: -dc
     43 
     44 # A string in quotes is checked whether it is not empty.
     45 .if "UNDEF"
     46 .  info The string literal "UNDEF" is not empty.
     47 .else
     48 .  error
     49 .endif
     50 
     51 # A space is not empty as well.
     52 # This differs from many other places where whitespace is trimmed.
     53 .if " "
     54 .  info The string literal " " is not empty, even though it consists of $\
     55 	whitespace only.
     56 .else
     57 .  error
     58 .endif
     59 
     60 .if "${UNDEF}"
     61 .  error
     62 .else
     63 .  info An undefined variable in quotes expands to an empty string, which $\
     64 	then evaluates to false.
     65 .endif
     66 
     67 .if "${:Uvalue}"
     68 .  info A nonempty variable expression evaluates to true.
     69 .else
     70 .  error
     71 .endif
     72 
     73 .if "${:U}"
     74 .  error
     75 .else
     76 .  info An empty variable evaluates to false.
     77 .endif
     78 
     79 # A non-empty string evaluates to true, no matter if it's a literal string or
     80 # if it contains variable expressions.  The parentheses are not necessary for
     81 # the parser, in this case their only purpose is to make the code harder to
     82 # read for humans.
     83 VAR=	value
     84 .if ("${VAR}")
     85 .else
     86 .  error
     87 .endif
     88 
     89 # In the conditions in .if directives, the left-hand side of a comparison must
     90 # be enclosed in quotes.  The right-hand side does not need to be enclosed in
     91 # quotes.
     92 .if "quoted" == quoted
     93 .else
     94 .  error
     95 .endif
     96 
     97 .MAKEFLAGS: -d0
     98 
     99 all: .PHONY
    100