https://sourceware.org/ml/gdb-patches/2013-07/msg00469.html

Hi.
This patch adds the missing calls to check_typedef
and adds a testcase to show the issue.

The PR is not closeable yet, but the remaining issues are more cleanups
than actual bug fixes.

Regression tested on amd64-linux.

I will check this in in a few days if there are no objections.

[The multiple calls to check_typedef (value_type (*argp)) are
bothersome, but the code is simpler this way, and I expect
resolving the rest of the issues in 15695 to potentially change this
code significantly.]

---

commit cbb25189b69e501ddca64917d810b54bb1466c93
Author: Doug Evans <dje@google.com>
Date:   Thu Aug 1 23:59:47 2013 +0000

    	PR symtab/15695
    	* valops.c (value_struct_elt): Add missing call to check_typedef.
    	(value_find_oload_method_list): Ditto.
    
    	testsuite/
    	* gdb.base/func-ptr.exp: New file.
    	* gdb.base/func-ptr.c: New file.

2013-08-01  Doug Evans  <dje@google.com>
 
	PR symtab/15695
	* valops.c (value_struct_elt): Add missing call to check_typedef.
	(value_find_oload_method_list): Ditto.

2013-08-01  Doug Evans  <dje@google.com>

	PR symtab/15695
	* gdb.base/func-ptr.exp: New file.
	* gdb.base/func-ptr.c: New file.

Index: gdb-7.6.1/gdb/testsuite/gdb.base/func-ptr.c
===================================================================
--- /dev/null
+++ gdb-7.6.1/gdb/testsuite/gdb.base/func-ptr.c
@@ -0,0 +1,30 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+   Copyright 2013 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/>.  */
+
+void
+bar ()
+{
+}
+
+typedef void foo (void);
+foo *pbar = bar;
+
+int
+main ()
+{
+  return 0;
+}
Index: gdb-7.6.1/gdb/testsuite/gdb.base/func-ptr.exp
===================================================================
--- /dev/null
+++ gdb-7.6.1/gdb/testsuite/gdb.base/func-ptr.exp
@@ -0,0 +1,30 @@
+# Copyright 2013 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 testcase exercises bug 15695.
+# Trying to print foo->bar if foo is a pointer to a typedef of a pointer
+# to a function will put gdb into an infinite loop.
+
+if { [prepare_for_testing func-ptr.exp "func-ptr" {func-ptr.c} {debug}] } {
+    return -1
+}
+
+if ![runto_main] {
+    fail "Can't run to main"
+    return 0
+}
+
+# This would put gdb into an infinite loop.
+gdb_test "print pbar->baz" "Attempt to extract .*"
Index: gdb-7.6.1/gdb/valops.c
===================================================================
--- gdb-7.6.1.orig/gdb/valops.c
+++ gdb-7.6.1/gdb/valops.c
@@ -2450,7 +2450,7 @@ value_struct_elt (struct value **argp, s
     {
       *argp = value_ind (*argp);
       /* Don't coerce fn pointer to fn and then back again!  */
-      if (TYPE_CODE (value_type (*argp)) != TYPE_CODE_FUNC)
+      if (TYPE_CODE (check_typedef (value_type (*argp))) != TYPE_CODE_FUNC)
 	*argp = coerce_array (*argp);
       t = check_typedef (value_type (*argp));
     }
@@ -2614,7 +2614,7 @@ value_find_oload_method_list (struct val
     {
       *argp = value_ind (*argp);
       /* Don't coerce fn pointer to fn and then back again!  */
-      if (TYPE_CODE (value_type (*argp)) != TYPE_CODE_FUNC)
+      if (TYPE_CODE (check_typedef (value_type (*argp))) != TYPE_CODE_FUNC)
 	*argp = coerce_array (*argp);
       t = check_typedef (value_type (*argp));
     }