[src/trunk]: src/usr.bin/make/unit-tests make(1): add test for the .newline v...

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

details:   https://anonhg.NetBSD.org/src/rev/9f4073bd756c
branches:  trunk
changeset: 1013015:9f4073bd756c
user:      rillig <rillig%NetBSD.org@localhost>
date:      Wed Aug 19 05:51:18 2020 +0000

description:
make(1): add test for the .newline variable

diffstat:

 usr.bin/make/unit-tests/varname-dot-newline.exp |   3 +++
 usr.bin/make/unit-tests/varname-dot-newline.mk  |  21 ++++++++++++++++++---
 2 files changed, 21 insertions(+), 3 deletions(-)

diffs (38 lines):

diff -r 01e7cb675913 -r 9f4073bd756c usr.bin/make/unit-tests/varname-dot-newline.exp
--- a/usr.bin/make/unit-tests/varname-dot-newline.exp   Wed Aug 19 05:40:06 2020 +0000
+++ b/usr.bin/make/unit-tests/varname-dot-newline.exp   Wed Aug 19 05:51:18 2020 +0000
@@ -1,1 +1,4 @@
+make: "varname-dot-newline.mk" line 16: The .newline variable can be overwritten.  Just don't do that.
+first
+second
 exit status 0
diff -r 01e7cb675913 -r 9f4073bd756c usr.bin/make/unit-tests/varname-dot-newline.mk
--- a/usr.bin/make/unit-tests/varname-dot-newline.mk    Wed Aug 19 05:40:06 2020 +0000
+++ b/usr.bin/make/unit-tests/varname-dot-newline.mk    Wed Aug 19 05:51:18 2020 +0000
@@ -1,8 +1,23 @@
-# $NetBSD: varname-dot-newline.mk,v 1.2 2020/08/16 14:25:16 rillig Exp $
+# $NetBSD: varname-dot-newline.mk,v 1.3 2020/08/19 05:51:18 rillig Exp $
 #
 # Tests for the special .newline variable.
+#
+# Contrary to the special variable named "" that is used in expressions like
+# ${:Usome-value}, the variable ".newline" is not protected against
+# modification.  Nobody exploits that though.
 
-# TODO: Implementation
+NEWLINE:=      ${.newline}
+
+.newline=      overwritten
+
+.if ${.newline} == ${NEWLINE}
+.info The .newline variable cannot be overwritten.  Good.
+.else
+.info The .newline variable can be overwritten.  Just don't do that.
+.endif
+
+# Restore the original value.
+.newline=      ${NEWLINE}
 
 all:
-       @:;
+       @echo 'first${.newline}second'