Add C++ "save gdb-index" test

I found a bug in the new DWARF reader series, related to the handling
of enumerator names.  This bug caused a crash, so this patch adds a
regression test for this particular case.  I'm checking this in.

1 files changed, 35 insertions, 0 deletions

diff --git a/gdb/testsuite/gdb.dwarf2/gdb-index-cxx.exp b/gdb/testsuite/gdb.dwarf2/gdb-index-cxx.exp
new file mode 100644
index 0000000..26ecdec
--- /dev/null
+++ b/gdb/testsuite/gdb.dwarf2/gdb-index-cxx.exp
@@ -0,0 +1,35 @@
+# Copyright 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 <http://www.gnu.org/licenses/>.
+
+load_lib dwarf.exp
+
+standard_testfile index.cc
+
+if {[prepare_for_testing "failed to prepare" "${testfile}" \
+	 [list ${srcfile}]]} {
+    return -1
+}
+
+# The bug was that gdb would crash when saving.
+set output_dir [standard_output_file ""]
+set cmd "save gdb-index"
+gdb_test_multiple "$cmd $output_dir" $cmd {
+    -re -wrap "Cannot use an index to create the index.*" {
+	unsupported $gdb_test_name
+    }
+    -re "^$cmd \[^\r\n\]*\r\n$gdb_prompt $" {
+	pass $gdb_test_name
+    }
+}