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      1  1.4  rillig # $NetBSD: opt-define.mk,v 1.4 2022/06/12 14:27:06 rillig Exp $
      2  1.1  rillig #
      3  1.3  rillig # Tests for the -D command line option, which defines global variables to the
      4  1.3  rillig # value 1, like in the C preprocessor.
      5  1.1  rillig 
      6  1.3  rillig .MAKEFLAGS: -DVAR
      7  1.1  rillig 
      8  1.3  rillig # The variable has the exact value "1", not "1.0".
      9  1.3  rillig .if ${VAR} != "1"
     10  1.3  rillig .  error
     11  1.3  rillig .endif
     12  1.3  rillig 
     13  1.3  rillig # The variable can be overwritten by assigning another value to it.  This
     14  1.3  rillig # would not be possible if the variable had been specified on the command line
     15  1.3  rillig # as 'VAR=1' instead of '-DVAR'.
     16  1.3  rillig VAR=		overwritten
     17  1.3  rillig .if ${VAR} != "overwritten"
     18  1.3  rillig .  error
     19  1.3  rillig .endif
     20  1.3  rillig 
     21  1.3  rillig # The variable can be undefined.  If the variable had been defined in the
     22  1.4  rillig # "Internal" or in the "Command" scope instead, undefining it would have no
     23  1.4  rillig # effect.
     24  1.3  rillig .undef VAR
     25  1.3  rillig .if defined(VAR)
     26  1.3  rillig .  error
     27  1.3  rillig .endif
     28  1.3  rillig 
     29  1.4  rillig # The C preprocessor allows to define a macro with a specific value.  Make
     30  1.4  rillig # behaves differently, it defines a variable with the name 'VAR=value' and the
     31  1.4  rillig # value 1.
     32  1.4  rillig .MAKEFLAGS: -DVAR=value
     33  1.4  rillig .if defined(VAR)
     34  1.4  rillig .  error
     35  1.4  rillig .endif
     36  1.4  rillig .if ${VAR=value} != "1"
     37  1.4  rillig .  error
     38  1.4  rillig .endif
     39  1.4  rillig 
     40  1.3  rillig all: .PHONY
     41