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Diffstat (limited to 'unit-tests/cmdline-undefined.mk')
| -rw-r--r-- | unit-tests/cmdline-undefined.mk | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/unit-tests/cmdline-undefined.mk b/unit-tests/cmdline-undefined.mk new file mode 100644 index 000000000000..5a3375cbbfb8 --- /dev/null +++ b/unit-tests/cmdline-undefined.mk @@ -0,0 +1,40 @@ +# $NetBSD: cmdline-undefined.mk,v 1.2 2020/11/04 04:49:33 rillig Exp $ +# +# Tests for undefined variable expressions in the command line. + +all: + # When the command line is parsed, variable assignments using the + # '=' assignment operator do get their variable name expanded + # (which probably occurs rarely in practice, if at all), but their + # variable value is not expanded, as usual. + # + @echo 'The = assignment operator' + @${.MAKE} -f ${MAKEFILE} print-undefined \ + CMDLINE='Undefined is $${UNDEFINED}.' + @echo + + # The interesting case is using the ':=' assignment operator, which + # expands its right-hand side. But only those variables that are + # defined. + @echo 'The := assignment operator' + @${.MAKE} -f ${MAKEFILE} print-undefined \ + CMDLINE:='Undefined is $${UNDEFINED}.' + @echo + +.if make(print-undefined) + +.MAKEFLAGS: MAKEFLAGS_ASSIGN='Undefined is $${UNDEFINED}.' +.MAKEFLAGS: MAKEFLAGS_SUBST:='Undefined is $${UNDEFINED}.' + +.info From the command line: ${CMDLINE} +.info From .MAKEFLAGS '=': ${MAKEFLAGS_ASSIGN} +.info From .MAKEFLAGS ':=': ${MAKEFLAGS_SUBST} + +UNDEFINED?= now defined + +.info From the command line: ${CMDLINE} +.info From .MAKEFLAGS '=': ${MAKEFLAGS_ASSIGN} +.info From .MAKEFLAGS ':=': ${MAKEFLAGS_SUBST} + +print-undefined: +.endif |