gdb/

* Makefile.in: Add gdb-dlfcn.c and gdb-dlfcn.h to build system.
	* config.in: Add new #define HAVE_LIBDL.
	* configure.ac: Add check for -ldl.
	* configure: Re-generated by autoconf.
	* gdb-dlfcn.c: New file.
	* gdb-dlfcn.h: New file.

gdb/gdb-dlfcn.h

@@ -0,0 +1,51 @@
+/* Platform independent shared object routines for GDB.
+
+   Copyright (C) 2011 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   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/>.  */
+
+#ifndef GDB_DLFCN_H
+#define GDB_DLFCN_H
+
+#include "defs.h"
+
+/* Load the dynamic library file named FILENAME, and return a handle
+   for that dynamic library.  Return NULL if the loading fails for any
+   reason.  */
+
+void *gdb_dlopen (const char *filename);
+
+/* Return the address of the symbol named SYMBOL inside the shared
+   library whose handle is HANDLE.  Return NULL when the symbol could
+   not be found.  */
+
+void *gdb_dlsym (void *handle, const char *symbol);
+
+/* Install a cleanup routine which closes the handle HANDLE.  */
+
+struct cleanup *make_cleanup_dlclose (void *handle);
+
+/* Cleanup the shared object pointed to by HANDLE. Return 0 on success
+   and nonzero on failure.  */
+
+int gdb_dlclose (void *handle);
+
+/* Return non-zero if the dynamic library functions are available on
+   this platform.  */
+
+int is_dl_available(void);
+
+#endif /* GDB_DLFCN_H */