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varname-dot-parsefile.mk revision 1.5 
      1 # $NetBSD: varname-dot-parsefile.mk,v 1.5 2020/10/24 08:50:17 rillig Exp $
      2 #
      3 # Tests for the special .PARSEFILE variable, which contains the basename part
      4 # of the file that is currently parsed.
      5 
      6 .if ${.PARSEFILE} != "varname-dot-parsefile.mk"
      7 .  error
      8 .endif
      9 
     10 # During parsing, it is possible to undefine .PARSEFILE.
     11 # Not that anyone would ever want to do this, but there's code in parse.c,
     12 # function PrintLocation, that explicitly handles this situation.
     13 .if !defined(.PARSEFILE)
     14 .  error
     15 .endif
     16 .undef .PARSEFILE
     17 .if defined(.PARSEFILE)
     18 .  error
     19 .endif
     20 
     21 # The variable .PARSEFILE is indirectly used by the .info directive,
     22 # via PrintLocation.
     23 .info At this point, .PARSEFILE is undefined.
     24 
     25 # There is absolutely no point in faking the location of the file that is
     26 # being parsed.  Technically, it's possible though, but only if the file
     27 # being parsed is a relative pathname.  See PrintLocation for details.
     28 .PARSEFILE=	fake-parsefile
     29 .info The location can be faked in some cases.
     30 
     31 # After including another file, .PARSEFILE is reset.
     32 .include "/dev/null"
     33 .info The location is no longer fake.
     34 
     35 all:
     36 	@echo At run time, .PARSEFILE is ${.PARSEFILE:Uundefined}.
     37