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varname.mk revision 1.5 
      1  1.5  rillig # $NetBSD: varname.mk,v 1.5 2020/11/02 22:16:24 rillig Exp $
      2  1.1  rillig #
      3  1.2  rillig # Tests for special variables, such as .MAKE or .PARSEDIR.
      4  1.5  rillig # And for variable names in general.
      5  1.1  rillig 
      6  1.5  rillig .MAKEFLAGS: -dv
      7  1.5  rillig 
      8  1.5  rillig # In variable names, braces are allowed, but they must be balanced.
      9  1.5  rillig # Parentheses and braces may be mixed.
     10  1.5  rillig VAR{{{}}}=	3 braces
     11  1.5  rillig .if "${VAR{{{}}}}" != "3 braces"
     12  1.5  rillig .  error
     13  1.5  rillig .endif
     14  1.5  rillig 
     15  1.5  rillig # In variable expressions, the parser works differently.  It doesn't treat
     16  1.5  rillig # braces and parentheses equally, therefore the first closing brace already
     17  1.5  rillig # marks the end of the variable name.
     18  1.5  rillig VARNAME=	VAR(((
     19  1.5  rillig ${VARNAME}=	3 open parentheses
     20  1.5  rillig .if "${VAR(((}}}}" != "3 open parentheses}}}"
     21  1.5  rillig .  error
     22  1.5  rillig .endif
     23  1.5  rillig 
     24  1.5  rillig # In the above test, the variable name is constructed indirectly.  Neither
     25  1.5  rillig # of the following expressions produces the intended effect.
     26  1.5  rillig # TODO: explain what happens in the parser here.
     27  1.5  rillig ${VAR(((}=	try1
     28  1.5  rillig ${VAR\(\(\(}=	try2
     29  1.5  rillig ${VAR\(\(\(}=	try3
     30  1.5  rillig 
     31  1.5  rillig .MAKEFLAGS: -d0
     32  1.1  rillig 
     33  1.1  rillig all:
     34