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cond-func.mk revision 1.4 
      1 # $NetBSD: cond-func.mk,v 1.4 2020/10/24 08:46:08 rillig Exp $
      2 #
      3 # Tests for those parts of the functions in .if conditions that are common
      4 # among several functions.
      5 #
      6 # The below test uses the function defined(...) since it has no side-effects,
      7 # the other functions (except empty(...)) would work equally well.
      8 
      9 DEF=			defined
     10 ${:UA B}=		variable name with spaces
     11 ${:UVAR(value)}=	variable name with parentheses
     12 ${:UVAR{value}}=	variable name with braces
     13 
     14 .if !defined(DEF)
     15 .  error
     16 .endif
     17 
     18 # Horizontal whitespace (space tab) after the opening parenthesis is ignored.
     19 .if !defined( 	DEF)
     20 .  error
     21 .endif
     22 
     23 # Horizontal whitespace (space tab) before the closing parenthesis is ignored.
     24 .if !defined(DEF 	)
     25 .  error
     26 .endif
     27 
     28 # The argument of a function must not directly contain whitespace.
     29 .if !defined(A B)
     30 .  error
     31 .endif
     32 
     33 # If necessary, the whitespace can be generated by a variable expression.
     34 .if !defined(${:UA B})
     35 .  error
     36 .endif
     37 
     38 # Characters that could be mistaken for operators must not appear directly
     39 # in a function argument.  As with whitespace, these can be generated
     40 # indirectly.
     41 #
     42 # It's not entirely clear why these characters are forbidden.
     43 # The most plausible reason seems to be typo detection.
     44 .if !defined(A&B)
     45 .  error
     46 .endif
     47 .if !defined(A|B)
     48 .  error
     49 .endif
     50 
     51 # Even parentheses may appear in variable names.
     52 # They must be balanced though.
     53 .if !defined(VAR(value))
     54 .  error
     55 .endif
     56 
     57 # Braces do not have any special meaning when parsing arguments.
     58 .if !defined(VAR{value})
     59 .  error
     60 .endif
     61 
     62 # There may be spaces around the operators and parentheses, and even
     63 # inside the parentheses.  The spaces inside the parentheses are not
     64 # allowed for the empty() function (see cond-func-empty.mk), therefore
     65 # they are typically omitted for the other functions as well.
     66 .if ! defined ( DEF )
     67 .  error
     68 .endif
     69 
     70 all:
     71 	@:;
     72