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make(1): add more tests for ':=' assignments

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rillig 2020-12-27 21:19:13 +00:00
parent ef6e52b452
commit 12e256c877
1 changed files with 31 additions and 1 deletions
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32
usr.bin/make/unit-tests/var-op-expand.mk
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@ -1,4 +1,4 @@
# $NetBSD: var-op-expand.mk,v 1.5 2020/12/27 20:45:52 rillig Exp $
# $NetBSD: var-op-expand.mk,v 1.6 2020/12/27 21:19:13 rillig Exp $
#
# Tests for the := variable assignment operator, which expands its
# right-hand side.
@ -86,6 +86,36 @@ UNDEF= Uwas undefined
.endif
# In variable assignments using the ':=' operator, undefined variables are
# preserved, no matter how indirectly they are referenced.
.undef REF3
REF2= <${REF3}>
REF= ${REF2}
VAR:= ${REF}
REF3= too late
.if ${VAR} != "<too late>"
. error
.endif
# In variable assignments using the ':=' operator, '$$' are preserved, no
# matter how indirectly they are referenced.
REF2= REF2:$$ $$$$
REF= REF:$$ $$$$ ${REF2}
VAR:= VAR:$$ $$$$ ${REF}
.if ${VAR} != "VAR:\$ \$\$ REF:\$ \$\$ REF2:\$ \$\$"
. error
.endif
# In variable assignments using the ':=' operator, '$$' are preserved in the
# expressions of the top level, but not in expressions that are nested.
VAR:= top:$$ ${:Unest1\:\$\$} ${:Unest2${:U\:\$\$}}
.if ${VAR} != "top:\$ nest1:\$ nest2:\$"
. error
.endif
# XXX: edge case: When a variable name refers to an undefined variable, the
# behavior differs between the '=' and the ':=' assignment operators.
# This bug exists since var.c 1.42 from 2000-05-11.