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'. 16VAR= 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 28all: .PHONY 29