[src/trunk]: src/usr.bin/make/unit-tests make(1): add test for undefined vari...

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

details:   https://anonhg.NetBSD.org/src/rev/d42a81270f9e
branches:  trunk
changeset: 948249:d42a81270f9e
user:      rillig <rillig%NetBSD.org@localhost>
date:      Tue Dec 22 19:38:44 2020 +0000

description:
make(1): add test for undefined variable in dependency declaration

diffstat:

 usr.bin/make/unit-tests/depsrc.exp |   3 +++
 usr.bin/make/unit-tests/depsrc.mk  |  17 ++++++++++++++++-
 2 files changed, 19 insertions(+), 1 deletions(-)

diffs (38 lines):

diff -r 544e10a781a7 -r d42a81270f9e usr.bin/make/unit-tests/depsrc.exp
--- a/usr.bin/make/unit-tests/depsrc.exp        Tue Dec 22 17:50:55 2020 +0000
+++ b/usr.bin/make/unit-tests/depsrc.exp        Tue Dec 22 19:38:44 2020 +0000
@@ -1,1 +1,4 @@
+: 'Undefined variables are expanded directly in the dependency'
+: 'declaration.  They are not preserved and maybe expanded later.'
+: 'This is in contrast to local variables such as ${.TARGET}.'
 exit status 0
diff -r 544e10a781a7 -r d42a81270f9e usr.bin/make/unit-tests/depsrc.mk
--- a/usr.bin/make/unit-tests/depsrc.mk Tue Dec 22 17:50:55 2020 +0000
+++ b/usr.bin/make/unit-tests/depsrc.mk Tue Dec 22 19:38:44 2020 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: depsrc.mk,v 1.3 2020/11/15 20:20:58 rillig Exp $
+# $NetBSD: depsrc.mk,v 1.4 2020/12/22 19:38:44 rillig Exp $
 #
 # Tests for special sources (those starting with a dot, followed by
 # uppercase letters) in dependency declarations, such as .PHONY.
@@ -7,5 +7,20 @@
 
 # TODO: Test 'target: ${:U.SILENT}'
 
+# Demonstrate when exactly undefined variables are expanded in a dependency
+# declaration.
+target: .PHONY source-${DEFINED_LATER}
+#
+DEFINED_LATER= later
+#
+source-: .PHONY
+       : 'Undefined variables are expanded directly in the dependency'
+       : 'declaration.  They are not preserved and maybe expanded later.'
+       : 'This is in contrast to local variables such as $${.TARGET}.'
+source-later: .PHONY
+       : 'Undefined variables are tried to be expanded in a dependency'
+       : 'declaration.  If that fails because the variable is undefined,'
+       : 'the expression is preserved and tried to be expanded later.'
+
 all:
        @:;