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      1 # $NetBSD: opt-define.mk,v 1.4 2022/06/12 14:27:06 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" or in the "Command" scope instead, undefining it would have no
     23 # effect.
     24 .undef VAR
     25 .if defined(VAR)
     26 .  error
     27 .endif
     28 
     29 # The C preprocessor allows to define a macro with a specific value.  Make
     30 # behaves differently, it defines a variable with the name 'VAR=value' and the
     31 # value 1.
     32 .MAKEFLAGS: -DVAR=value
     33 .if defined(VAR)
     34 .  error
     35 .endif
     36 .if ${VAR=value} != "1"
     37 .  error
     38 .endif
     39 
     40 all: .PHONY
     41