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varname-dot-parsedir.mk revision 1.4 
      1  1.4  rillig # $NetBSD: varname-dot-parsedir.mk,v 1.4 2020/09/12 11:55:28 rillig Exp $
      2  1.1  rillig #
      3  1.3  rillig # Tests for the special .PARSEDIR variable, which contains the directory part
      4  1.3  rillig # of the file that is currently parsed.
      5  1.1  rillig 
      6  1.3  rillig # The .PARSEDIR may be absolute or relative, therefore there is not much that
      7  1.3  rillig # can be tested here.
      8  1.3  rillig .if !${.PARSEDIR:tA:M*/unit-tests}
      9  1.3  rillig .  error
     10  1.3  rillig .endif
     11  1.3  rillig 
     12  1.3  rillig # During parsing, it is possible to undefine .PARSEDIR.
     13  1.3  rillig # Not that anyone would ever want to do this, but there's code in parse.c,
     14  1.3  rillig # function PrintLocation, that explicitly handles this situation.
     15  1.4  rillig .if !defined(.PARSEDIR)
     16  1.4  rillig .  error
     17  1.4  rillig .endif
     18  1.3  rillig .undef .PARSEDIR
     19  1.4  rillig .if defined(.PARSEDIR)
     20  1.4  rillig .  error
     21  1.4  rillig .endif
     22  1.3  rillig 
     23  1.4  rillig # The variable .PARSEDIR is indirectly used by the .info directive,
     24  1.4  rillig # via PrintLocation.
     25  1.4  rillig #
     26  1.3  rillig # The .rawout file contains the full path to the current directory.
     27  1.3  rillig # In the .out file, it is filtered out.
     28  1.3  rillig .info At this point, .PARSEDIR is undefined.
     29  1.3  rillig 
     30  1.3  rillig # There is absolutely no point in faking the location of the file that is
     31  1.3  rillig # being parsed.  Technically, it's possible though.
     32  1.3  rillig .PARSEDIR = /fake-absolute-path
     33  1.3  rillig .info The location can be faked.
     34  1.3  rillig 
     35  1.3  rillig # After including another file, .PARSEDIR is reset.
     36  1.3  rillig .include "/dev/null"
     37  1.3  rillig .info The location is no longer fake.
     38  1.1  rillig 
     39  1.1  rillig all:
     40  1.4  rillig 	@echo At run time, .PARSEDIR is ${.PARSEDIR:Uundefined}.
     41