[gdb/testsuite] Add test-case gold-gdb-index.exp

There's a PR binutils/15646 - "gold-generated .gdb_index has duplicated
symbols that gdb-generated index doesn't", and gdb contains a workaround,
added in commit 8943b87476 "Work around gold/15646".

Add a test-case testing this workaround.

Tested on x86_64-linux.

gdb/testsuite/ChangeLog:

2020-05-26  Tom de Vries  <tdevries@suse.de>

	* gdb.base/gold-gdb-index-2.c: New test.
	* gdb.base/gold-gdb-index.c: New test.
	* gdb.base/gold-gdb-index.exp: New file.
	* gdb.base/gold-gdb-index.h: New test.

1 files changed, 25 insertions, 0 deletions

diff --git a/gdb/testsuite/gdb.base/gold-gdb-index.h b/gdb/testsuite/gdb.base/gold-gdb-index.h
new file mode 100644
index 0000000..81ebb7b
--- /dev/null
+++ b/gdb/testsuite/gdb.base/gold-gdb-index.h
@@ -0,0 +1,25 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+   Copyright 2020 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/>.  */
+
+namespace N1
+{
+  class C1
+  {
+   public:
+    static void baz () {}
+  };
+}