[PATCH] tests: add _AR override coverage

There were no tests for per-target _AR settings, so add some.

* t/ar_override.sh: New test.
---
 t/ar_override.sh | 50 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 t/ar_override.sh

diff --git a/t/ar_override.sh b/t/ar_override.sh
new file mode 100644
index 000000000000..4f4024989aec
--- /dev/null
+++ b/t/ar_override.sh
@@ -0,0 +1,50 @@
+#! /bin/sh
+# Copyright (C) 2009-2022 Free Software Foundation, Inc.
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+# Test to make sure _AR variables are detected and used as documented.
+
+. test-init.sh
+
+cat >> configure.ac << 'END'
+AC_PROG_CC
+AM_PROG_AR
+AC_PROG_RANLIB
+AC_OUTPUT
+END
+
+cat > Makefile.am << 'END'
+EXTRA_LIBRARIES = libfoo.a libbar.a
+libfoo_a_SOURCES = foo.c
+libfoo_a_AR = $(AR)
+libbar_a_SOURCES = bar.c
+END
+
+$ACLOCAL
+$AUTOMAKE -a
+
+# We should use libfoo_a_AR not AR ARFLAGS.
+grep '.\$(libfoo_a_AR) *libfoo.a' Makefile.in
+grep '.\$(AR).*libfoo.a' Makefile.in && exit 1
+grep '.\$(ARFLAGS).*libfoo.a' Makefile.in && exit 1
+grep '^ *libfoo_a_AR *=.*\$(ARFLAGS)' Makefile.in && exit 1
+
+# We should use default AR ARFLAGS.
+grep '^ *libbar_a_AR *=.*\$(ARFLAGS)' Makefile.in
+
+# Silent make rules should use AM_V_AR.
+grep '.\$(AM_V_AR)\$(libbar_a_AR)' Makefile.in
+
+exit 0
-- 
2.33.0