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