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varname-dot-parsedir.mk revision 1.8 
      1  1.8  rillig # $NetBSD: varname-dot-parsedir.mk,v 1.8 2023/06/21 07:30:50 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  1.8  rillig #
      6  1.8  rillig # See also
      7  1.8  rillig #	varname-dot-includedfromdir.mk
      8  1.8  rillig #	varname-dot-includedfromfile.mk
      9  1.8  rillig #	varname-dot-parsefile.mk
     10  1.8  rillig #
     11  1.8  rillig # History
     12  1.8  rillig #	.PARSEDIR and .PARSEFILE were added on 1999-08-09.
     13  1.1  rillig 
     14  1.3  rillig # The .PARSEDIR may be absolute or relative, therefore there is not much that
     15  1.3  rillig # can be tested here.
     16  1.3  rillig .if !${.PARSEDIR:tA:M*/unit-tests}
     17  1.3  rillig .  error
     18  1.3  rillig .endif
     19  1.3  rillig 
     20  1.3  rillig # During parsing, it is possible to undefine .PARSEDIR.
     21  1.3  rillig # Not that anyone would ever want to do this, but there's code in parse.c,
     22  1.3  rillig # function PrintLocation, that explicitly handles this situation.
     23  1.4  rillig .if !defined(.PARSEDIR)
     24  1.4  rillig .  error
     25  1.4  rillig .endif
     26  1.3  rillig .undef .PARSEDIR
     27  1.4  rillig .if defined(.PARSEDIR)
     28  1.4  rillig .  error
     29  1.4  rillig .endif
     30  1.3  rillig 
     31  1.4  rillig # The variable .PARSEDIR is indirectly used by the .info directive,
     32  1.4  rillig # via PrintLocation.
     33  1.4  rillig #
     34  1.3  rillig # The .rawout file contains the full path to the current directory.
     35  1.3  rillig # In the .out file, it is filtered out.
     36  1.7  rillig # expect+1: At this point, .PARSEDIR is undefined.
     37  1.3  rillig .info At this point, .PARSEDIR is undefined.
     38  1.3  rillig 
     39  1.3  rillig # There is absolutely no point in faking the location of the file that is
     40  1.5  rillig # being parsed.  Technically, it's possible though, but only if the file
     41  1.5  rillig # being parsed is a relative pathname.  See PrintLocation for details.
     42  1.6  rillig .PARSEDIR=	/fake-absolute-path
     43  1.5  rillig .info The location can be faked in some cases.
     44  1.3  rillig 
     45  1.3  rillig # After including another file, .PARSEDIR is reset.
     46  1.3  rillig .include "/dev/null"
     47  1.7  rillig # expect+1: The location is no longer fake.
     48  1.3  rillig .info The location is no longer fake.
     49  1.1  rillig 
     50  1.1  rillig all:
     51  1.4  rillig 	@echo At run time, .PARSEDIR is ${.PARSEDIR:Uundefined}.
     52