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tests/make: demonstrate what happens for 'make -DVAR=value'

This commit is contained in:
rillig 2022-06-12 14:27:06 +00:00
parent 67f66322f4
commit c697d06cb5
1 changed files with 14 additions and 2 deletions
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16
usr.bin/make/unit-tests/opt-define.mk
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@ -1,4 +1,4 @@
# $NetBSD: opt-define.mk,v 1.3 2022/01/23 16:09:38 rillig Exp $
# $NetBSD: opt-define.mk,v 1.4 2022/06/12 14:27:06 rillig Exp $
#
# Tests for the -D command line option, which defines global variables to the
# value 1, like in the C preprocessor.
@ -19,10 +19,22 @@ VAR= overwritten
.endif
# The variable can be undefined. If the variable had been defined in the
# "Internal" scope instead, undefining it would have no effect.
# "Internal" or in the "Command" scope instead, undefining it would have no
# effect.
.undef VAR
.if defined(VAR)
. error
.endif
# The C preprocessor allows to define a macro with a specific value. Make
# behaves differently, it defines a variable with the name 'VAR=value' and the
# value 1.
.MAKEFLAGS: -DVAR=value
.if defined(VAR)
. error
.endif
.if ${VAR=value} != "1"
. error
.endif
all: .PHONY