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      1 # $NetBSD: cond-func-exists.mk,v 1.8 2025/01/10 23:00:38 rillig Exp $
      2 #
      3 # Tests for the exists() function in .if conditions.
      4 
      5 .if !exists(.)
      6 .  error
      7 .endif
      8 
      9 # The argument to the function must not be enclosed in quotes.
     10 # Neither double quotes nor single quotes are allowed.
     11 .if exists(".")
     12 .  error
     13 .endif
     14 
     15 .if exists('.')
     16 .  error
     17 .endif
     18 
     19 # The only way to escape characters that would otherwise influence the parser
     20 # is to enclose them in an expression.  For function arguments,
     21 # neither the backslash nor the dollar sign act as escape character.
     22 .if exists(\.)
     23 .  error
     24 .endif
     25 
     26 .if !exists(${:U.})
     27 .  error
     28 .endif
     29 
     30 # The argument to the function can have several expressions.
     31 # See cond-func.mk for the characters that cannot be used directly.
     32 .if !exists(${.PARSEDIR}/${.PARSEFILE})
     33 .  error
     34 .endif
     35 
     36 # Whitespace is trimmed on both sides of the function argument.
     37 .if !exists(	.	)
     38 .  error
     39 .endif
     40 
     41 # Expressions in the argument of a function call don't have to be defined.
     42 .if exists(${UNDEF})
     43 .  error
     44 .endif
     45 
     46 # The exists function does not really look up the file in the file system,
     47 # instead it uses a cache that is preloaded very early, before parsing the
     48 # first makefile.  At that time, the file did not exist yet.
     49 _!=	> cond-func-exists.just-created
     50 .if exists(cond-func-exists.just-created)
     51 .  error
     52 .endif
     53 _!=	rm cond-func-exists.just-created
     54 
     55 all:
     56 	@:;
     57