tests/make: demonstrate what happens for 'make -DVAR=value'
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# $NetBSD: opt-define.mk,v 1.3 2022/01/23 16:09:38 rillig Exp $
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# $NetBSD: opt-define.mk,v 1.4 2022/06/12 14:27:06 rillig Exp $
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#
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# Tests for the -D command line option, which defines global variables to the
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# value 1, like in the C preprocessor.
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@ -19,10 +19,22 @@ VAR= overwritten
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.endif
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# The variable can be undefined. If the variable had been defined in the
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# "Internal" scope instead, undefining it would have no effect.
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# "Internal" or in the "Command" scope instead, undefining it would have no
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# effect.
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.undef VAR
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.if defined(VAR)
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. error
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.endif
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# The C preprocessor allows to define a macro with a specific value. Make
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# behaves differently, it defines a variable with the name 'VAR=value' and the
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# value 1.
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.MAKEFLAGS: -DVAR=value
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.if defined(VAR)
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. error
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.endif
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.if ${VAR=value} != "1"
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. error
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.endif
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all: .PHONY
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