[src/trunk]: src/usr.bin/make/unit-tests make(1): add tests for appending to ...

[rillig <rillig%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/89c94112a1dd
branches:  trunk
changeset: 1012242:89c94112a1dd
user:      rillig <rillig%NetBSD.org@localhost>
date:      Sun Jul 26 10:59:56 2020 +0000

description:
make(1): add tests for appending to a variable

diffstat:

 usr.bin/make/unit-tests/varmisc.mk |  43 +++++++++++++++++++++++++++++++++++++-
 1 files changed, 42 insertions(+), 1 deletions(-)

diffs (54 lines):

diff -r 30e5eb524c8d -r 89c94112a1dd usr.bin/make/unit-tests/varmisc.mk
--- a/usr.bin/make/unit-tests/varmisc.mk        Sun Jul 26 10:58:59 2020 +0000
+++ b/usr.bin/make/unit-tests/varmisc.mk        Sun Jul 26 10:59:56 2020 +0000
@@ -1,4 +1,4 @@
-# $Id: varmisc.mk,v 1.12 2020/07/26 10:48:21 rillig Exp $
+# $Id: varmisc.mk,v 1.13 2020/07/26 10:59:56 rillig Exp $
 #
 # Miscellaneous variable tests.
 
@@ -98,3 +98,44 @@
 .for val in ${SD_VALUES}
        @printf '%s: %-8s = %s\n' $@ ${val} ${SD.${val}:Q}
 .endfor
+
+# Appending to an undefined variable does not add a space in front.
+.undef APPENDED
+APPENDED+=     value
+.if ${APPENDED} != "value"
+.error "${APPENDED}"
+.endif
+
+# Appending to an empty variable adds a space between the old value
+# and the additional value.
+APPENDED=      # empty
+APPENDED+=     value
+.if ${APPENDED} != " value"
+.error "${APPENDED}"
+.endif
+
+# Appending to parameterized variables works as well.
+PARAM=         param
+VAR.${PARAM}=  1
+VAR.${PARAM}+= 2
+.if ${VAR.param} != "1 2"
+.error "${VAR.param}"
+.endif
+
+# The variable name can contain arbitrary characters.
+# If the expanded variable name ends in a +, this still does not influence
+# the parser. The assignment operator is still a simple assignment.
+# Therefore, there is no need to add a space between the variable name
+# and the assignment operator.
+PARAM=         +
+VAR.${PARAM}=  1
+VAR.${PARAM}+= 2
+.if ${VAR.+} != "1 2"
+.error "${VAR.+}"
+.endif
+.for param in + ! ?
+VAR.${param}=  ${param}
+.endfor
+.if ${VAR.+} != "+" || ${VAR.!} != "!" || ${VAR.?} != "?"
+.error "${VAR.+}" "${VAR.!}" "${VAR.?}"
+.endif