[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.

5 files changed, 132 insertions, 0 deletions

diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index e4124bf..5c29730 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,3 +1,10 @@
+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.
+
 2020-05-25  Tom de Vries  <tdevries@suse.de>
 
 	* boards/gold-gdb-index.exp: New file.
diff --git a/gdb/testsuite/gdb.base/gold-gdb-index-2.c b/gdb/testsuite/gdb.base/gold-gdb-index-2.c
new file mode 100644
index 0000000..2df637b
--- /dev/null
+++ b/gdb/testsuite/gdb.base/gold-gdb-index-2.c
@@ -0,0 +1,23 @@
+/* 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/>.  */
+
+#include "gold-gdb-index.h"
+
+namespace N1
+{
+  void bar () { C1::baz (); }
+}
diff --git a/gdb/testsuite/gdb.base/gold-gdb-index.c b/gdb/testsuite/gdb.base/gold-gdb-index.c
new file mode 100644
index 0000000..e0f8c2e
--- /dev/null
+++ b/gdb/testsuite/gdb.base/gold-gdb-index.c
@@ -0,0 +1,29 @@
+/* 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/>.  */
+
+#include "gold-gdb-index.h"
+
+namespace N1
+{
+  void foo () { C1::baz (); }
+}
+
+int
+main ()
+{
+  return 0;
+}
diff --git a/gdb/testsuite/gdb.base/gold-gdb-index.exp b/gdb/testsuite/gdb.base/gold-gdb-index.exp
new file mode 100644
index 0000000..e42bf43
--- /dev/null
+++ b/gdb/testsuite/gdb.base/gold-gdb-index.exp
@@ -0,0 +1,48 @@
+# 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/>.  */
+
+# This tests the gdb workaround for PR binutils/15646.
+
+standard_testfile .c gold-gdb-index-2.c
+
+if {[prepare_for_testing "failed to prepare" $testfile "$srcfile $srcfile2" \
+	 {debug c++ additional_flags=-fuse-ld=gold \
+	      additional_flags=-Wl,--gdb-index \
+	      additional_flags=-ggnu-pubnames}]} {
+    return -1
+}
+
+if { [readnow] } {
+    return -1
+}
+
+gdb_test_no_output "set auto-solib-add off"
+
+if ![runto_main] then {
+    fail "can't run to main"
+    return 0
+}
+
+gdb_test_no_output "set breakpoint pending off"
+gdb_test "break N1::misspelled" "Function \"N1::misspelled\" not defined\."
+
+gdb_test_multiple "maint info symtabs" "" {
+    -re -wrap "\{ symtab \[^\r\n\]*gold-gdb-index-2.c.*" {
+	fail $gdb_test_name
+    }
+    -re -wrap "" {
+	pass $gdb_test_name
+    }
+}
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 () {}
+  };
+}