From a017c69c8113e908ac5a403ffca434001236cc7b Mon Sep 17 00:00:00 2001
From: rillig <rillig@NetBSD.org>
Date: Tue, 16 Feb 2021 18:02:19 +0000
Subject: [PATCH] make: demonstrate inconsistency in .undef of an exported
 variable

---
 usr.bin/make/unit-tests/directive-undef.exp |  1 +
 usr.bin/make/unit-tests/directive-undef.mk  | 21 +++++++++++++++++++--
 2 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/usr.bin/make/unit-tests/directive-undef.exp b/usr.bin/make/unit-tests/directive-undef.exp
index d64cb8b5afe0..bb3c7e5b47c3 100644
--- a/usr.bin/make/unit-tests/directive-undef.exp
+++ b/usr.bin/make/unit-tests/directive-undef.exp
@@ -1,5 +1,6 @@
 make: "directive-undef.mk" line 29: The .undef directive requires an argument
 make: "directive-undef.mk" line 86: Unknown modifier 'Z'
+make: "directive-undef.mk" line 103: warning: UT_EXPORTED is still listed in .MAKE.EXPORTED even though spaceit is not exported anymore.
 make: Fatal errors encountered -- cannot continue
 make: stopped in unit-tests
 exit status 1
diff --git a/usr.bin/make/unit-tests/directive-undef.mk b/usr.bin/make/unit-tests/directive-undef.mk
index b9a69f733517..41ea6b5bf8fa 100644
--- a/usr.bin/make/unit-tests/directive-undef.mk
+++ b/usr.bin/make/unit-tests/directive-undef.mk
@@ -1,4 +1,4 @@
-# $NetBSD: directive-undef.mk,v 1.9 2020/12/22 20:10:21 rillig Exp $
+# $NetBSD: directive-undef.mk,v 1.10 2021/02/16 18:02:19 rillig Exp $
 #
 # Tests for the .undef directive.
 #
@@ -86,5 +86,22 @@ ${DOLLAR}=	dollar
 .undef ${VARNAMES:L:Z}
 
 
+UT_EXPORTED=	exported-value
+.export UT_EXPORTED
+.if ${:!echo "\${UT_EXPORTED:-not-exported}"!} != "exported-value"
+.  error
+.endif
+.if !${.MAKE.EXPORTED:MUT_EXPORTED}
+.  error
+.endif
+.undef UT_EXPORTED		# XXX: does not update .MAKE.EXPORTED
+.if ${:!echo "\${UT_EXPORTED:-not-exported}"!} != "not-exported"
+.  error
+.endif
+.if ${.MAKE.EXPORTED:MUT_EXPORTED}
+.  warning UT_EXPORTED is still listed in .MAKE.EXPORTED even though $\
+	   it is not exported anymore.
+.endif
+
+
 all:
-	@:;