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var-op-append.mk revision 1.7 
      1 # $NetBSD: var-op-append.mk,v 1.7 2020/10/30 20:36:33 rillig Exp $
      2 #
      3 # Tests for the += variable assignment operator, which appends to a variable,
      4 # creating it if necessary.
      5 
      6 # Appending to an undefined variable is possible.
      7 # The variable is created, and no extra space is added before the value.
      8 VAR+=	one
      9 .if ${VAR} != "one"
     10 .  error
     11 .endif
     12 
     13 # Appending to an existing variable adds a single space and the value.
     14 VAR+=	two
     15 .if ${VAR} != "one two"
     16 .  error
     17 .endif
     18 
     19 # Appending an empty string nevertheless adds a single space.
     20 VAR+=	# empty
     21 .if ${VAR} != "one two "
     22 .  error
     23 .endif
     24 
     25 # Variable names may contain '+', and this character is also part of the
     26 # '+=' assignment operator.  As far as possible, the '+' is interpreted as
     27 # part of the assignment operator.
     28 #
     29 # See Parse_DoVar
     30 C++=	value
     31 .if ${C+} != "value" || defined(C++)
     32 .  error
     33 .endif
     34 
     35 # Try out how often the variable name is expanded when appending to a
     36 # nonexistent variable.
     37 # As of 2020-10-30, that's two times.
     38 # XXX: That's one time too often.
     39 # See Var_Append, the call to Var_Set.
     40 .MAKEFLAGS: -dv
     41 VAR.${:U\$\$\$\$\$\$\$\$}+=	dollars
     42 .MAKEFLAGS: -d0
     43 .if ${VAR.${:U\$\$\$\$}} != "dollars"
     44 .  error
     45 .endif
     46 
     47 all:
     48 	@:;
     49