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opt-define.mk revision 1.3 
      1 # $NetBSD: opt-define.mk,v 1.3 2022/01/23 16:09:38 rillig Exp $
      2 #
      3 # Tests for the -D command line option, which defines global variables to the
      4 # value 1, like in the C preprocessor.
      5 
      6 .MAKEFLAGS: -DVAR
      7 
      8 # The variable has the exact value "1", not "1.0".
      9 .if ${VAR} != "1"
     10 .  error
     11 .endif
     12 
     13 # The variable can be overwritten by assigning another value to it.  This
     14 # would not be possible if the variable had been specified on the command line
     15 # as 'VAR=1' instead of '-DVAR'.
     16 VAR=		overwritten
     17 .if ${VAR} != "overwritten"
     18 .  error
     19 .endif
     20 
     21 # The variable can be undefined.  If the variable had been defined in the
     22 # "Internal" scope instead, undefining it would have no effect.
     23 .undef VAR
     24 .if defined(VAR)
     25 .  error
     26 .endif
     27 
     28 all: .PHONY
     29