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directive-ifndef.mk revision 1.9 
      1 # $NetBSD: directive-ifndef.mk,v 1.9 2023/10/19 18:24:33 rillig Exp $
      2 #
      3 # Tests for the .ifndef directive, which can be used for multiple-inclusion
      4 # guards.  In contrast to C, where #ifndef and #define nicely line up the
      5 # macro name, there is no such syntax in make.  Therefore, it is more
      6 # common to use .if !defined(GUARD) instead.
      7 #
      8 # See also:
      9 #	directive-include-guard.mk
     10 
     11 .ifndef GUARD
     12 GUARD=	# defined
     13 # expect+1: guarded section
     14 .  info guarded section
     15 .endif
     16 
     17 .ifndef GUARD
     18 GUARD=	# defined
     19 .  info guarded section
     20 .endif
     21 
     22 .if !defined(GUARD)
     23 GUARD=	# defined
     24 .  info guarded section
     25 .endif
     26 
     27 
     28 # The '.ifndef' directive can be used with multiple arguments, even negating
     29 # them.  Since these conditions are confusing for humans, they should be
     30 # replaced with easier-to-understand plain '.if' directives.
     31 DEFINED=
     32 .ifndef UNDEFINED && UNDEFINED
     33 .else
     34 .  error
     35 .endif
     36 .ifndef UNDEFINED && DEFINED
     37 .  error
     38 .endif
     39 .ifndef DEFINED && DEFINED
     40 .  error
     41 .endif
     42 .ifndef !UNDEFINED && !UNDEFINED
     43 .  error
     44 .endif
     45 .ifndef !UNDEFINED && !DEFINED
     46 .  error
     47 .endif
     48 .ifndef !DEFINED && !DEFINED
     49 .else
     50 .  error
     51 .endif
     52 
     53 
     54 # The negation from the 'if-not-defined' directive only applies to bare words,
     55 # but not to numbers, quoted strings or expressions.  Those are evaluated
     56 # without extra negation, just like in a plain '.if' directive.
     57 .ifndef 0
     58 .  error
     59 .endif
     60 .ifndef 1
     61 .else
     62 .  error
     63 .endif
     64 .ifndef ""
     65 .  error
     66 .endif
     67 .ifndef "word"
     68 .else
     69 .  error
     70 .endif
     71 .ifndef ${:UUNDEFINED}
     72 .else
     73 .  error
     74 .endif
     75 .ifndef ${:UDEFINED}
     76 .  error
     77 .endif
     78 .ifndef ${:U0}
     79 .  error
     80 .endif
     81 .ifndef ${:U1}
     82 .else
     83 .  error
     84 .endif
     85 
     86 
     87 all:
     88