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      1 # $NetBSD: varname-makefile.mk,v 1.3 2020/11/09 22:36:44 rillig Exp $
      2 #
      3 # Tests for the special MAKEFILE variable, which contains the current
      4 # makefile from the -f command line option.
      5 #
      6 # When there are multiple -f options, the variable MAKEFILE is set
      7 # again for each of these makefiles, before the file is parsed.
      8 # Including a file via .include does not influence the MAKEFILE
      9 # variable though.
     10 
     11 .if ${MAKEFILE:T} != "varname-makefile.mk"
     12 .  error
     13 .endif
     14 
     15 # This variable lives in the "Internal" namespace.
     16 # TODO: Why does it do that, and what consequences does this have?
     17 
     18 # Deleting the variable does not work since this variable does not live in
     19 # the "Global" namespace but in "Internal", which is kind of a child
     20 # namespace.
     21 #
     22 .undef MAKEFILE
     23 .if ${MAKEFILE:T} != "varname-makefile.mk"
     24 .  error
     25 .endif
     26 
     27 # Overwriting this variable is possible since the "Internal" namespace
     28 # serves as a fallback for the "Global" namespace (see VarFind).
     29 #
     30 MAKEFILE=	overwritten
     31 .if ${MAKEFILE:T} != "overwritten"
     32 .  error
     33 .endif
     34 
     35 # When the overwritten value is deleted, the fallback value becomes
     36 # visible again.
     37 #
     38 .undef MAKEFILE
     39 .if ${MAKEFILE:T} != "varname-makefile.mk"
     40 .  error
     41 .endif
     42 
     43 all:
     44 	# MAKEFILE is the file that appeared last in the command line.
     45 	: In the end, MAKEFILE is ${MAKEFILE}.
     46 
     47 # Additional makefiles can be added while reading a makefile.  They will be
     48 # read in order.
     49 .MAKEFLAGS: -f /dev/null
     50