Move gthr to toplevel libgcc

	gcc:
	* gthr-single.h, gthr.h: Move to ../libgcc.
	* gthr-aix.h: Move to ../libgcc/config/rs6000.
	* gthr-dce.h: Move to ../libgcc/config/pa.
	* gthr-lynx.h: Move to ../libgcc/config.
	* gthr-mipssde.h: Move to ../libgcc/config/mips.
	* gthr-posix.h: Move to ../libgcc/config.
	* gthr-rtems.h: Likewise.
	* gthr-tpf.h: Move to ../libgcc/config/s390.
	* gthr-vxworks.h: Move to ../libgcc/config.
	* gthr-win32.h: Move to ../libgcc/config/i386.
	* configure.ac (gthread_flags): Remove
	(gthr-default.h): Don't create.
	(thread_file): Don't substitute.
	* configure: Regenerate.
	* Makefile.in (GCC_THREAD_FILE): Remove.
	(GTHREAD_FLAGS): Remove.
	(libgcc.mvars): Remove GTHREAD_FLAGS.
	* config/t-vxworks (EXTRA_HEADERS): Remove.

	gcc/po:
	* EXCLUDES (gthr-aix.h, gthr-dce.h, gthr-posix.c, gthr-posix.h)
	(gthr-rtems.h, gthr-single.h, gthr-solaris.h, gthr-vxworks.h)
	(gthr-win32.h, gthr.h): Remove.

	libgcc:
	* gthr-single.h, gthr.h: New files.
	* config/gthr-lynx.h, config/gthr-posix.h., config/gthr-rtems.h,
	config/gthr-vxworks.h, config/i386/gthr-win32.h,
	config/mips/gthr-mipssde.h, config/pa/gthr-dce.h,
	config/rs6000/gthr-aix.h, config/s390/gthr-tpf.h: New files.
	* config/i386/gthr-win32.c: Include "gthr-win32.h".
	* configure.ac (thread_header): New variable.
	Set it depending on target_thread_file.
	(gthr-default.h): Link from $thread_header.
	* configure: Regenerate.
	* Makefile.in (LIBGCC2_CFLAGS): Remove $(GTHREAD_FLAGS).

	libgfortran:
	* Makefile.am (AM_CPPFLAGS): Add
	-I$(srcdir)/$(MULTISRCTOP)../libgcc, -I$(MULTIBUILDTOP)../libgcc.
	* Makefile.in: Regenerate.
	* acinclude.m4 (LIBGFOR_CHECK_GTHR_DEFAULT): Remove.
	* configure.ac (LIBGFOR_CHECK_GTHR_DEFAULT): Likewise.
	* configure: Regenerate.
	* config.h.in: Regenerate.

	libobjc:
	* Makefile.in (INCLUDES): Add -I$(MULTIBUILDTOP)../libgcc.
	* configure.ac (target_thread_file, HAVE_GTHR_DEFAULT): Remove.
	* configure: Regenerate.
	* config.h.in: Regenerate.

	libstdc++-v3:
	* acinclude.m4 (GLIBCXX_CONFIGURE): Determine and substitute
	toplevel_builddir.
	(GLIBCXX_ENABLE_THREADS): Remove glibcxx_thread_h,
	HAVE_GTHR_DEFAULT, enable_thread.
	(GLIBCXX_CHECK_GTHREADS): Reflect gthr move to libgcc.
	* include/Makefile.am (thread_host_headers): Remove
	${host_builddir}/gthr-tpf.h.
	(${host_builddir}/gthr.h): Reflect gthr move to libgcc.
	Use $<.
	(${host_builddir}/gthr-single.h): Likewise.
	(${host_builddir}/gthr-posix.h): Likewise.
	(${host_builddir}/gthr-tpf.h): Remove.
	(${host_builddir}/gthr-default.h): Likewise.
	* configure, config.h.in: Regenerate.
	* Makefile.in, doc/Makefile.in, include/Makefile.in,
	libsupc++/Makefile.in, po/Makefile.in, python/Makefile.in,
	src/Makefile.intestsuite/Makefile.in: Regenerate.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@180776 138bc75d-0d04-0410-961f-82ee72b054a4

16 files changed, 3603 insertions, 22 deletions

diff --git a/libgcc/ChangeLog b/libgcc/ChangeLog
index c169190c397..1bbe29afd05 100644
--- a/libgcc/ChangeLog
+++ b/libgcc/ChangeLog
@@ -1,5 +1,19 @@
 2011-11-02  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
 
+	* gthr-single.h, gthr.h: New files.
+	* config/gthr-lynx.h, config/gthr-posix.h., config/gthr-rtems.h,
+	config/gthr-vxworks.h, config/i386/gthr-win32.h,
+	config/mips/gthr-mipssde.h, config/pa/gthr-dce.h,
+	config/rs6000/gthr-aix.h, config/s390/gthr-tpf.h: New files.
+	* config/i386/gthr-win32.c: Include "gthr-win32.h".
+	* configure.ac (thread_header): New variable.
+	Set it depending on target_thread_file.
+	(gthr-default.h): Link from $thread_header.
+	* configure: Regenerate.
+	* Makefile.in (LIBGCC2_CFLAGS): Remove $(GTHREAD_FLAGS).
+
+2011-11-02  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
+
 	* configure.ac (tm_file_): New variable.
 	Determine from tm_file.
 	(tm_file, tm_defines): Substitute.
diff --git a/libgcc/Makefile.in b/libgcc/Makefile.in
index 2ea6ca69d64..8f0c02ff3ec 100644
--- a/libgcc/Makefile.in
+++ b/libgcc/Makefile.in
@@ -223,8 +223,7 @@ endif
 #
 LIBGCC2_DEBUG_CFLAGS = -g
 LIBGCC2_CFLAGS = -O2 $(LIBGCC2_INCLUDES) $(GCC_CFLAGS) $(HOST_LIBGCC2_CFLAGS) \
-		 $(LIBGCC2_DEBUG_CFLAGS) $(GTHREAD_FLAGS) \
-		 -DIN_LIBGCC2 \
+		 $(LIBGCC2_DEBUG_CFLAGS) -DIN_LIBGCC2 \
 		 -fbuilding-libgcc -fno-stack-protector \
 		 $(INHIBIT_LIBC_CFLAGS)
 
diff --git a/libgcc/config/gthr-lynx.h b/libgcc/config/gthr-lynx.h
new file mode 100644
index 00000000000..c98c2e6693e
--- /dev/null
+++ b/libgcc/config/gthr-lynx.h
@@ -0,0 +1,61 @@
+/* Threads compatibility routines for libgcc2 and libobjc for
+   LynxOS.  */
+/* Compile this one with gcc.  */
+/* Copyright (C) 2004, 2008, 2009, 2011 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC 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, or (at your option) any later
+version.
+
+GCC 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.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+#ifndef GCC_GTHR_LYNX_H
+#define GCC_GTHR_LYNX_H
+
+#ifdef _MULTITHREADED
+
+/* Using the macro version of pthread_setspecific leads to a
+   compilation error.  Instead we have two choices either kill all
+   macros in pthread.h with defining _POSIX_THREADS_CALLS or undefine
+   individual macros where we should fall back on the function
+   implementation.  We choose the second approach.  */
+
+#include <pthread.h>
+#undef pthread_setspecific
+
+/* When using static libc on LynxOS, we cannot define pthread_create
+   weak.  If the multi-threaded application includes iostream.h,
+   gthr-posix.h is included and pthread_create will be defined weak.
+   If pthread_create is weak its defining module in libc is not
+   necessarily included in the link and the symbol is resolved to zero.
+   Therefore the first call to it will crash.
+
+   Since -mthreads is a multilib switch on LynxOS we know that at this
+   point we are compiling for multi-threaded.  Omitting the weak
+   definitions at this point should have no effect.  */
+
+#undef  GTHREAD_USE_WEAK
+#define GTHREAD_USE_WEAK 0
+
+#include "config/gthr-posix.h"
+
+#else
+#include "gthr-single.h"
+#endif
+
+#endif /* GCC_GTHR_LYNX_H */
diff --git a/libgcc/config/gthr-posix.h b/libgcc/config/gthr-posix.h
new file mode 100644
index 00000000000..46054f6a7c2
--- /dev/null
+++ b/libgcc/config/gthr-posix.h
@@ -0,0 +1,879 @@
+/* Threads compatibility routines for libgcc2 and libobjc.  */
+/* Compile this one with gcc.  */
+/* Copyright (C) 1997, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
+   2008, 2009, 2010, 2011 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC 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, or (at your option) any later
+version.
+
+GCC 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.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+#ifndef GCC_GTHR_POSIX_H
+#define GCC_GTHR_POSIX_H
+
+/* POSIX threads specific definitions.
+   Easy, since the interface is just one-to-one mapping.  */
+
+#define __GTHREADS 1
+#define __GTHREADS_CXX0X 1
+
+/* Some implementations of <pthread.h> require this to be defined.  */
+#if !defined(_REENTRANT) && defined(__osf__)
+#define _REENTRANT 1
+#endif
+
+#include <pthread.h>
+
+#if ((defined(_LIBOBJC) || defined(_LIBOBJC_WEAK)) \
+     || !defined(_GTHREAD_USE_MUTEX_TIMEDLOCK))
+# include <unistd.h>
+# if defined(_POSIX_TIMEOUTS) && _POSIX_TIMEOUTS >= 0
+#  define _GTHREAD_USE_MUTEX_TIMEDLOCK 1
+# else
+#  define _GTHREAD_USE_MUTEX_TIMEDLOCK 0
+# endif
+#endif
+
+typedef pthread_t __gthread_t;
+typedef pthread_key_t __gthread_key_t;
+typedef pthread_once_t __gthread_once_t;
+typedef pthread_mutex_t __gthread_mutex_t;
+typedef pthread_mutex_t __gthread_recursive_mutex_t;
+typedef pthread_cond_t __gthread_cond_t;
+typedef struct timespec __gthread_time_t;
+
+/* POSIX like conditional variables are supported.  Please look at comments
+   in gthr.h for details. */
+#define __GTHREAD_HAS_COND	1
+
+#define __GTHREAD_MUTEX_INIT PTHREAD_MUTEX_INITIALIZER
+#define __GTHREAD_ONCE_INIT PTHREAD_ONCE_INIT
+#if defined(PTHREAD_RECURSIVE_MUTEX_INITIALIZER)
+#define __GTHREAD_RECURSIVE_MUTEX_INIT PTHREAD_RECURSIVE_MUTEX_INITIALIZER
+#elif defined(PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP)
+#define __GTHREAD_RECURSIVE_MUTEX_INIT PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP
+#else
+#define __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION __gthread_recursive_mutex_init_function
+#endif
+#define __GTHREAD_COND_INIT PTHREAD_COND_INITIALIZER
+#define __GTHREAD_TIME_INIT {0,0}
+
+#if SUPPORTS_WEAK && GTHREAD_USE_WEAK
+# ifndef __gthrw_pragma
+#  define __gthrw_pragma(pragma)
+# endif
+# define __gthrw2(name,name2,type) \
+  static __typeof(type) name __attribute__ ((__weakref__(#name2))); \
+  __gthrw_pragma(weak type)
+# define __gthrw_(name) __gthrw_ ## name
+#else
+# define __gthrw2(name,name2,type)
+# define __gthrw_(name) name
+#endif
+
+/* Typically, __gthrw_foo is a weak reference to symbol foo.  */
+#define __gthrw(name) __gthrw2(__gthrw_ ## name,name,name)
+
+/* On Tru64, /usr/include/pthread.h uses #pragma extern_prefix "__" to
+   map a subset of the POSIX pthread API to mangled versions of their
+   names.  */
+#if defined(__osf__) && defined(_PTHREAD_USE_MANGLED_NAMES_)
+#define __gthrw3(name) __gthrw2(__gthrw_ ## name, __ ## name, name)
+__gthrw3(pthread_once)
+__gthrw3(pthread_getspecific)
+__gthrw3(pthread_setspecific)
+
+__gthrw3(pthread_create)
+__gthrw3(pthread_join)
+__gthrw3(pthread_detach)
+__gthrw3(pthread_equal)
+__gthrw3(pthread_self)
+__gthrw3(pthread_cancel)
+__gthrw3(sched_yield)
+
+__gthrw3(pthread_mutex_lock)
+__gthrw3(pthread_mutex_trylock)
+#if _GTHREAD_USE_MUTEX_TIMEDLOCK
+__gthrw3(pthread_mutex_timedlock)
+#endif
+__gthrw3(pthread_mutex_unlock)
+__gthrw3(pthread_mutex_init)
+__gthrw3(pthread_mutex_destroy)
+
+__gthrw3(pthread_cond_broadcast)
+__gthrw3(pthread_cond_signal)
+__gthrw3(pthread_cond_wait)
+__gthrw3(pthread_cond_timedwait)
+__gthrw3(pthread_cond_destroy)
+#else
+__gthrw(pthread_once)
+__gthrw(pthread_getspecific)
+__gthrw(pthread_setspecific)
+
+__gthrw(pthread_create)
+__gthrw(pthread_join)
+__gthrw(pthread_equal)
+__gthrw(pthread_self)
+__gthrw(pthread_detach)
+#ifndef __BIONIC__
+__gthrw(pthread_cancel)
+#endif
+__gthrw(sched_yield)
+
+__gthrw(pthread_mutex_lock)
+__gthrw(pthread_mutex_trylock)
+#if _GTHREAD_USE_MUTEX_TIMEDLOCK
+__gthrw(pthread_mutex_timedlock)
+#endif
+__gthrw(pthread_mutex_unlock)
+__gthrw(pthread_mutex_init)
+__gthrw(pthread_mutex_destroy)
+
+__gthrw(pthread_cond_broadcast)
+__gthrw(pthread_cond_signal)
+__gthrw(pthread_cond_wait)
+__gthrw(pthread_cond_timedwait)
+__gthrw(pthread_cond_destroy)
+#endif
+
+__gthrw(pthread_key_create)
+__gthrw(pthread_key_delete)
+__gthrw(pthread_mutexattr_init)
+__gthrw(pthread_mutexattr_settype)
+__gthrw(pthread_mutexattr_destroy)
+
+
+#if defined(_LIBOBJC) || defined(_LIBOBJC_WEAK)
+/* Objective-C.  */
+#if defined(__osf__) && defined(_PTHREAD_USE_MANGLED_NAMES_)
+__gthrw3(pthread_cond_init)
+__gthrw3(pthread_exit)
+#else
+__gthrw(pthread_cond_init)
+__gthrw(pthread_exit)
+#endif /* __osf__ && _PTHREAD_USE_MANGLED_NAMES_ */
+#ifdef _POSIX_PRIORITY_SCHEDULING
+#ifdef _POSIX_THREAD_PRIORITY_SCHEDULING
+__gthrw(sched_get_priority_max)
+__gthrw(sched_get_priority_min)
+#endif /* _POSIX_THREAD_PRIORITY_SCHEDULING */
+#endif /* _POSIX_PRIORITY_SCHEDULING */
+__gthrw(pthread_attr_destroy)
+__gthrw(pthread_attr_init)
+__gthrw(pthread_attr_setdetachstate)
+#ifdef _POSIX_THREAD_PRIORITY_SCHEDULING
+__gthrw(pthread_getschedparam)
+__gthrw(pthread_setschedparam)
+#endif /* _POSIX_THREAD_PRIORITY_SCHEDULING */
+#endif /* _LIBOBJC || _LIBOBJC_WEAK */
+
+#if SUPPORTS_WEAK && GTHREAD_USE_WEAK
+
+/* On Solaris 2.6 up to 9, the libc exposes a POSIX threads interface even if
+   -pthreads is not specified.  The functions are dummies and most return an
+   error value.  However pthread_once returns 0 without invoking the routine
+   it is passed so we cannot pretend that the interface is active if -pthreads
+   is not specified.  On Solaris 2.5.1, the interface is not exposed at all so
+   we need to play the usual game with weak symbols.  On Solaris 10 and up, a
+   working interface is always exposed.  On FreeBSD 6 and later, libc also
+   exposes a dummy POSIX threads interface, similar to what Solaris 2.6 up
+   to 9 does.  FreeBSD >= 700014 even provides a pthread_cancel stub in libc,
+   which means the alternate __gthread_active_p below cannot be used there.  */
+
+#if defined(__FreeBSD__) || (defined(__sun) && defined(__svr4__))
+
+static volatile int __gthread_active = -1;
+
+static void
+__gthread_trigger (void)
+{
+  __gthread_active = 1;
+}
+
+static inline int
+__gthread_active_p (void)
+{
+  static pthread_mutex_t __gthread_active_mutex = PTHREAD_MUTEX_INITIALIZER;
+  static pthread_once_t __gthread_active_once = PTHREAD_ONCE_INIT;
+
+  /* Avoid reading __gthread_active twice on the main code path.  */
+  int __gthread_active_latest_value = __gthread_active;
+
+  /* This test is not protected to avoid taking a lock on the main code
+     path so every update of __gthread_active in a threaded program must
+     be atomic with regard to the result of the test.  */
+  if (__builtin_expect (__gthread_active_latest_value < 0, 0))
+    {
+      if (__gthrw_(pthread_once))
+	{
+	  /* If this really is a threaded program, then we must ensure that
+	     __gthread_active has been set to 1 before exiting this block.  */
+	  __gthrw_(pthread_mutex_lock) (&__gthread_active_mutex);
+	  __gthrw_(pthread_once) (&__gthread_active_once, __gthread_trigger);
+	  __gthrw_(pthread_mutex_unlock) (&__gthread_active_mutex);
+	}
+
+      /* Make sure we'll never enter this block again.  */
+      if (__gthread_active < 0)
+	__gthread_active = 0;
+
+      __gthread_active_latest_value = __gthread_active;
+    }
+
+  return __gthread_active_latest_value != 0;
+}
+
+#else /* neither FreeBSD nor Solaris */
+
+static inline int
+__gthread_active_p (void)
+{
+/* Android's C library does not provide pthread_cancel, check for
+   `pthread_create' instead.  */
+#ifndef __BIONIC__
+  static void *const __gthread_active_ptr
+    = __extension__ (void *) &__gthrw_(pthread_cancel);
+#else
+  static void *const __gthread_active_ptr
+    = __extension__ (void *) &__gthrw_(pthread_create);
+#endif
+  return __gthread_active_ptr != 0;
+}
+
+#endif /* FreeBSD or Solaris */
+
+#else /* not SUPPORTS_WEAK */
+
+/* Similar to Solaris, HP-UX 11 for PA-RISC provides stubs for pthread
+   calls in shared flavors of the HP-UX C library.  Most of the stubs
+   have no functionality.  The details are described in the "libc cumulative
+   patch" for each subversion of HP-UX 11.  There are two special interfaces
+   provided for checking whether an application is linked to a shared pthread
+   library or not.  However, these interfaces aren't available in early
+   libpthread libraries.  We also need a test that works for archive
+   libraries.  We can't use pthread_once as some libc versions call the
+   init function.  We also can't use pthread_create or pthread_attr_init
+   as these create a thread and thereby prevent changing the default stack
+   size.  The function pthread_default_stacksize_np is available in both
+   the archive and shared versions of libpthread.   It can be used to
+   determine the default pthread stack size.  There is a stub in some
+   shared libc versions which returns a zero size if pthreads are not
+   active.  We provide an equivalent stub to handle cases where libc
+   doesn't provide one.  */
+
+#if defined(__hppa__) && defined(__hpux__)
+
+static volatile int __gthread_active = -1;
+
+static inline int
+__gthread_active_p (void)
+{
+  /* Avoid reading __gthread_active twice on the main code path.  */
+  int __gthread_active_latest_value = __gthread_active;
+  size_t __s;
+
+  if (__builtin_expect (__gthread_active_latest_value < 0, 0))
+    {
+      pthread_default_stacksize_np (0, &__s);
+      __gthread_active = __s ? 1 : 0;
+      __gthread_active_latest_value = __gthread_active;
+    }
+
+  return __gthread_active_latest_value != 0;
+}
+
+#else /* not hppa-hpux */
+
+static inline int
+__gthread_active_p (void)
+{
+  return 1;
+}
+
+#endif /* hppa-hpux */
+
+#endif /* SUPPORTS_WEAK */
+
+#ifdef _LIBOBJC
+
+/* This is the config.h file in libobjc/ */
+#include <config.h>
+
+#ifdef HAVE_SCHED_H
+# include <sched.h>
+#endif
+
+/* Key structure for maintaining thread specific storage */
+static pthread_key_t _objc_thread_storage;
+static pthread_attr_t _objc_thread_attribs;
+
+/* Thread local storage for a single thread */
+static void *thread_local_storage = NULL;
+
+/* Backend initialization functions */
+
+/* Initialize the threads subsystem.  */
+static inline int
+__gthread_objc_init_thread_system (void)
+{
+  if (__gthread_active_p ())
+    {
+      /* Initialize the thread storage key.  */
+      if (__gthrw_(pthread_key_create) (&_objc_thread_storage, NULL) == 0)
+	{
+	  /* The normal default detach state for threads is
+	   * PTHREAD_CREATE_JOINABLE which causes threads to not die
+	   * when you think they should.  */
+	  if (__gthrw_(pthread_attr_init) (&_objc_thread_attribs) == 0
+	      && __gthrw_(pthread_attr_setdetachstate) (&_objc_thread_attribs,
+					      PTHREAD_CREATE_DETACHED) == 0)
+	    return 0;
+	}
+    }
+
+  return -1;
+}
+
+/* Close the threads subsystem.  */
+static inline int
+__gthread_objc_close_thread_system (void)
+{
+  if (__gthread_active_p ()
+      && __gthrw_(pthread_key_delete) (_objc_thread_storage) == 0
+      && __gthrw_(pthread_attr_destroy) (&_objc_thread_attribs) == 0)
+    return 0;
+
+  return -1;
+}
+
+/* Backend thread functions */
+
+/* Create a new thread of execution.  */
+static inline objc_thread_t
+__gthread_objc_thread_detach (void (*func)(void *), void *arg)
+{
+  objc_thread_t thread_id;
+  pthread_t new_thread_handle;
+
+  if (!__gthread_active_p ())
+    return NULL;
+
+  if (!(__gthrw_(pthread_create) (&new_thread_handle, &_objc_thread_attribs,
+				  (void *) func, arg)))
+    thread_id = (objc_thread_t) new_thread_handle;
+  else
+    thread_id = NULL;
+
+  return thread_id;
+}
+
+/* Set the current thread's priority.  */
+static inline int
+__gthread_objc_thread_set_priority (int priority)
+{
+  if (!__gthread_active_p ())
+    return -1;
+  else
+    {
+#ifdef _POSIX_PRIORITY_SCHEDULING
+#ifdef _POSIX_THREAD_PRIORITY_SCHEDULING
+      pthread_t thread_id = __gthrw_(pthread_self) ();
+      int policy;
+      struct sched_param params;
+      int priority_min, priority_max;
+
+      if (__gthrw_(pthread_getschedparam) (thread_id, &policy, &params) == 0)
+	{
+	  if ((priority_max = __gthrw_(sched_get_priority_max) (policy)) == -1)
+	    return -1;
+
+	  if ((priority_min = __gthrw_(sched_get_priority_min) (policy)) == -1)
+	    return -1;
+
+	  if (priority > priority_max)
+	    priority = priority_max;
+	  else if (priority < priority_min)
+	    priority = priority_min;
+	  params.sched_priority = priority;
+
+	  /*
+	   * The solaris 7 and several other man pages incorrectly state that
+	   * this should be a pointer to policy but pthread.h is universally
+	   * at odds with this.
+	   */
+	  if (__gthrw_(pthread_setschedparam) (thread_id, policy, &params) == 0)
+	    return 0;
+	}
+#endif /* _POSIX_THREAD_PRIORITY_SCHEDULING */
+#endif /* _POSIX_PRIORITY_SCHEDULING */
+      return -1;
+    }
+}
+
+/* Return the current thread's priority.  */
+static inline int
+__gthread_objc_thread_get_priority (void)
+{
+#ifdef _POSIX_PRIORITY_SCHEDULING
+#ifdef _POSIX_THREAD_PRIORITY_SCHEDULING
+  if (__gthread_active_p ())
+    {
+      int policy;
+      struct sched_param params;
+
+      if (__gthrw_(pthread_getschedparam) (__gthrw_(pthread_self) (), &policy, &params) == 0)
+	return params.sched_priority;
+      else
+	return -1;
+    }
+  else
+#endif /* _POSIX_THREAD_PRIORITY_SCHEDULING */
+#endif /* _POSIX_PRIORITY_SCHEDULING */
+    return OBJC_THREAD_INTERACTIVE_PRIORITY;
+}
+
+/* Yield our process time to another thread.  */
+static inline void
+__gthread_objc_thread_yield (void)
+{
+  if (__gthread_active_p ())
+    __gthrw_(sched_yield) ();
+}
+
+/* Terminate the current thread.  */
+static inline int
+__gthread_objc_thread_exit (void)
+{
+  if (__gthread_active_p ())
+    /* exit the thread */
+    __gthrw_(pthread_exit) (&__objc_thread_exit_status);
+
+  /* Failed if we reached here */
+  return -1;
+}
+
+/* Returns an integer value which uniquely describes a thread.  */
+static inline objc_thread_t
+__gthread_objc_thread_id (void)
+{
+  if (__gthread_active_p ())
+    return (objc_thread_t) __gthrw_(pthread_self) ();
+  else
+    return (objc_thread_t) 1;
+}
+
+/* Sets the thread's local storage pointer.  */
+static inline int
+__gthread_objc_thread_set_data (void *value)
+{
+  if (__gthread_active_p ())
+    return __gthrw_(pthread_setspecific) (_objc_thread_storage, value);
+  else
+    {
+      thread_local_storage = value;
+      return 0;
+    }
+}
+
+/* Returns the thread's local storage pointer.  */
+static inline void *
+__gthread_objc_thread_get_data (void)
+{
+  if (__gthread_active_p ())
+    return __gthrw_(pthread_getspecific) (_objc_thread_storage);
+  else
+    return thread_local_storage;
+}
+
+/* Backend mutex functions */
+
+/* Allocate a mutex.  */
+static inline int
+__gthread_objc_mutex_allocate (objc_mutex_t mutex)
+{
+  if (__gthread_active_p ())
+    {
+      mutex->backend = objc_malloc (sizeof (pthread_mutex_t));
+
+      if (__gthrw_(pthread_mutex_init) ((pthread_mutex_t *) mutex->backend, NULL))
+	{
+	  objc_free (mutex->backend);
+	  mutex->backend = NULL;
+	  return -1;
+	}
+    }
+
+  return 0;
+}
+
+/* Deallocate a mutex.  */
+static inline int
+__gthread_objc_mutex_deallocate (objc_mutex_t mutex)
+{
+  if (__gthread_active_p ())
+    {
+      int count;
+
+      /*
+       * Posix Threads specifically require that the thread be unlocked
+       * for __gthrw_(pthread_mutex_destroy) to work.
+       */
+
+      do
+	{
+	  count = __gthrw_(pthread_mutex_unlock) ((pthread_mutex_t *) mutex->backend);
+	  if (count < 0)
+	    return -1;
+	}
+      while (count);
+
+      if (__gthrw_(pthread_mutex_destroy) ((pthread_mutex_t *) mutex->backend))
+	return -1;
+
+      objc_free (mutex->backend);
+      mutex->backend = NULL;
+    }
+  return 0;
+}
+
+/* Grab a lock on a mutex.  */
+static inline int
+__gthread_objc_mutex_lock (objc_mutex_t mutex)
+{
+  if (__gthread_active_p ()
+      && __gthrw_(pthread_mutex_lock) ((pthread_mutex_t *) mutex->backend) != 0)
+    {
+      return -1;
+    }
+
+  return 0;
+}
+
+/* Try to grab a lock on a mutex.  */
+static inline int
+__gthread_objc_mutex_trylock (objc_mutex_t mutex)
+{
+  if (__gthread_active_p ()
+      && __gthrw_(pthread_mutex_trylock) ((pthread_mutex_t *) mutex->backend) != 0)
+    {
+      return -1;
+    }
+
+  return 0;
+}
+
+/* Unlock the mutex */
+static inline int
+__gthread_objc_mutex_unlock (objc_mutex_t mutex)
+{
+  if (__gthread_active_p ()
+      && __gthrw_(pthread_mutex_unlock) ((pthread_mutex_t *) mutex->backend) != 0)
+    {
+      return -1;
+    }
+
+  return 0;
+}
+
+/* Backend condition mutex functions */
+
+/* Allocate a condition.  */
+static inline int
+__gthread_objc_condition_allocate (objc_condition_t condition)
+{
+  if (__gthread_active_p ())
+    {
+      condition->backend = objc_malloc (sizeof (pthread_cond_t));
+
+      if (__gthrw_(pthread_cond_init) ((pthread_cond_t *) condition->backend, NULL))
+	{
+	  objc_free (condition->backend);
+	  condition->backend = NULL;
+	  return -1;
+	}
+    }
+
+  return 0;
+}
+
+/* Deallocate a condition.  */
+static inline int
+__gthread_objc_condition_deallocate (objc_condition_t condition)
+{
+  if (__gthread_active_p ())
+    {
+      if (__gthrw_(pthread_cond_destroy) ((pthread_cond_t *) condition->backend))
+	return -1;
+
+      objc_free (condition->backend);
+      condition->backend = NULL;
+    }
+  return 0;
+}
+
+/* Wait on the condition */
+static inline int
+__gthread_objc_condition_wait (objc_condition_t condition, objc_mutex_t mutex)
+{
+  if (__gthread_active_p ())
+    return __gthrw_(pthread_cond_wait) ((pthread_cond_t *) condition->backend,
+			      (pthread_mutex_t *) mutex->backend);
+  else
+    return 0;
+}
+
+/* Wake up all threads waiting on this condition.  */
+static inline int
+__gthread_objc_condition_broadcast (objc_condition_t condition)
+{
+  if (__gthread_active_p ())
+    return __gthrw_(pthread_cond_broadcast) ((pthread_cond_t *) condition->backend);
+  else
+    return 0;
+}
+
+/* Wake up one thread waiting on this condition.  */
+static inline int
+__gthread_objc_condition_signal (objc_condition_t condition)
+{
+  if (__gthread_active_p ())
+    return __gthrw_(pthread_cond_signal) ((pthread_cond_t *) condition->backend);
+  else
+    return 0;
+}
+
+#else /* _LIBOBJC */
+
+static inline int
+__gthread_create (__gthread_t *__threadid, void *(*__func) (void*),
+		  void *__args)
+{
+  return __gthrw_(pthread_create) (__threadid, NULL, __func, __args);
+}
+
+static inline int
+__gthread_join (__gthread_t __threadid, void **__value_ptr)
+{
+  return __gthrw_(pthread_join) (__threadid, __value_ptr);
+}
+
+static inline int
+__gthread_detach (__gthread_t __threadid)
+{
+  return __gthrw_(pthread_detach) (__threadid);
+}
+
+static inline int
+__gthread_equal (__gthread_t __t1, __gthread_t __t2)
+{
+  return __gthrw_(pthread_equal) (__t1, __t2);
+}
+
+static inline __gthread_t
+__gthread_self (void)
+{
+  return __gthrw_(pthread_self) ();
+}
+
+static inline int
+__gthread_yield (void)
+{
+  return __gthrw_(sched_yield) ();
+}
+
+static inline int
+__gthread_once (__gthread_once_t *__once, void (*__func) (void))
+{
+  if (__gthread_active_p ())
+    return __gthrw_(pthread_once) (__once, __func);
+  else
+    return -1;
+}
+
+static inline int
+__gthread_key_create (__gthread_key_t *__key, void (*__dtor) (void *))
+{
+  return __gthrw_(pthread_key_create) (__key, __dtor);
+}
+
+static inline int
+__gthread_key_delete (__gthread_key_t __key)
+{
+  return __gthrw_(pthread_key_delete) (__key);
+}
+
+static inline void *
+__gthread_getspecific (__gthread_key_t __key)
+{
+  return __gthrw_(pthread_getspecific) (__key);
+}
+
+static inline int
+__gthread_setspecific (__gthread_key_t __key, const void *__ptr)
+{
+  return __gthrw_(pthread_setspecific) (__key, __ptr);
+}
+
+static inline int
+__gthread_mutex_destroy (__gthread_mutex_t *__mutex)
+{
+  if (__gthread_active_p ())
+    return __gthrw_(pthread_mutex_destroy) (__mutex);
+  else
+    return 0;
+}
+
+static inline int
+__gthread_mutex_lock (__gthread_mutex_t *__mutex)
+{
+  if (__gthread_active_p ())
+    return __gthrw_(pthread_mutex_lock) (__mutex);
+  else
+    return 0;
+}
+
+static inline int
+__gthread_mutex_trylock (__gthread_mutex_t *__mutex)
+{
+  if (__gthread_active_p ())
+    return __gthrw_(pthread_mutex_trylock) (__mutex);
+  else
+    return 0;
+}
+
+#if _GTHREAD_USE_MUTEX_TIMEDLOCK
+static inline int
+__gthread_mutex_timedlock (__gthread_mutex_t *__mutex,
+			   const __gthread_time_t *__abs_timeout)
+{
+  if (__gthread_active_p ())
+    return __gthrw_(pthread_mutex_timedlock) (__mutex, __abs_timeout);
+  else
+    return 0;
+}
+#endif
+
+static inline int
+__gthread_mutex_unlock (__gthread_mutex_t *__mutex)
+{
+  if (__gthread_active_p ())
+    return __gthrw_(pthread_mutex_unlock) (__mutex);
+  else
+    return 0;
+}
+
+#ifndef PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP
+static inline int
+__gthread_recursive_mutex_init_function (__gthread_recursive_mutex_t *__mutex)
+{
+  if (__gthread_active_p ())
+    {
+      pthread_mutexattr_t __attr;
+      int __r;
+
+      __r = __gthrw_(pthread_mutexattr_init) (&__attr);
+      if (!__r)
+	__r = __gthrw_(pthread_mutexattr_settype) (&__attr,
+						   PTHREAD_MUTEX_RECURSIVE);
+      if (!__r)
+	__r = __gthrw_(pthread_mutex_init) (__mutex, &__attr);
+      if (!__r)
+	__r = __gthrw_(pthread_mutexattr_destroy) (&__attr);
+      return __r;
+    }
+  return 0;
+}
+#endif
+
+static inline int
+__gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *__mutex)
+{
+  return __gthread_mutex_lock (__mutex);
+}
+
+static inline int
+__gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *__mutex)
+{
+  return __gthread_mutex_trylock (__mutex);
+}
+
+#if _GTHREAD_USE_MUTEX_TIMEDLOCK
+static inline int
+__gthread_recursive_mutex_timedlock (__gthread_recursive_mutex_t *__mutex,
+				     const __gthread_time_t *__abs_timeout)
+{
+  return __gthread_mutex_timedlock (__mutex, __abs_timeout);
+}
+#endif
+
+static inline int
+__gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *__mutex)
+{
+  return __gthread_mutex_unlock (__mutex);
+}
+
+static inline int
+__gthread_cond_broadcast (__gthread_cond_t *__cond)
+{
+  return __gthrw_(pthread_cond_broadcast) (__cond);
+}
+
+static inline int
+__gthread_cond_signal (__gthread_cond_t *__cond)
+{
+  return __gthrw_(pthread_cond_signal) (__cond);
+}
+
+static inline int
+__gthread_cond_wait (__gthread_cond_t *__cond, __gthread_mutex_t *__mutex)
+{
+  return __gthrw_(pthread_cond_wait) (__cond, __mutex);
+}
+
+static inline int
+__gthread_cond_timedwait (__gthread_cond_t *__cond, __gthread_mutex_t *__mutex,
+			  const __gthread_time_t *__abs_timeout)
+{
+  return __gthrw_(pthread_cond_timedwait) (__cond, __mutex, __abs_timeout);
+}
+
+static inline int
+__gthread_cond_wait_recursive (__gthread_cond_t *__cond,
+			       __gthread_recursive_mutex_t *__mutex)
+{
+  return __gthread_cond_wait (__cond, __mutex);
+}
+
+static inline int
+__gthread_cond_timedwait_recursive (__gthread_cond_t *__cond,
+				    __gthread_recursive_mutex_t *__mutex,
+				    const __gthread_time_t *__abs_timeout)
+{
+  return __gthread_cond_timedwait (__cond, __mutex, __abs_timeout);
+}
+
+static inline int
+__gthread_cond_destroy (__gthread_cond_t* __cond)
+{
+  return __gthrw_(pthread_cond_destroy) (__cond);
+}
+
+#endif /* _LIBOBJC */
+
+#endif /* ! GCC_GTHR_POSIX_H */
diff --git a/libgcc/config/gthr-rtems.h b/libgcc/config/gthr-rtems.h
new file mode 100644
index 00000000000..c5bd52292cf
--- /dev/null
+++ b/libgcc/config/gthr-rtems.h
@@ -0,0 +1,157 @@
+/* RTEMS threads compatibility routines for libgcc2 and libobjc.
+   by: Rosimildo da Silva( rdasilva@connecttel.com ) */
+/* Compile this one with gcc.  */
+/* Copyright (C) 1997, 1999, 2000, 2002, 2003, 2005, 2008, 2009
+   Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC 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, or (at your option) any later
+version.
+
+GCC 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.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+#ifndef GCC_GTHR_RTEMS_H
+#define GCC_GTHR_RTEMS_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define __GTHREADS 1
+
+#define __GTHREAD_ONCE_INIT  0
+#define __GTHREAD_MUTEX_INIT_FUNCTION  rtems_gxx_mutex_init
+#define __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION  rtems_gxx_recursive_mutex_init
+
+/* Avoid dependency on rtems specific headers.  */
+typedef void *__gthread_key_t;
+typedef int   __gthread_once_t;
+typedef void *__gthread_mutex_t;
+typedef void *__gthread_recursive_mutex_t;
+
+/*
+ * External functions provided by RTEMS. They are very similar to their POSIX
+ * counterparts. A "Wrapper API" is being use to avoid dependency on any RTEMS
+ * header files.
+ */
+
+/* generic per task variables */
+extern int rtems_gxx_once (__gthread_once_t *__once, void (*__func) (void));
+extern int rtems_gxx_key_create (__gthread_key_t *__key, void (*__dtor) (void *));
+extern int rtems_gxx_key_delete (__gthread_key_t __key);
+extern void *rtems_gxx_getspecific (__gthread_key_t __key);
+extern int rtems_gxx_setspecific (__gthread_key_t __key, const void *__ptr);
+
+/* mutex support */
+extern void rtems_gxx_mutex_init (__gthread_mutex_t *__mutex);
+extern int rtems_gxx_mutex_destroy (__gthread_mutex_t *__mutex);
+extern int rtems_gxx_mutex_lock (__gthread_mutex_t *__mutex);
+extern int rtems_gxx_mutex_trylock (__gthread_mutex_t *__mutex);
+extern int rtems_gxx_mutex_unlock (__gthread_mutex_t *__mutex);
+
+/* recursive mutex support */
+extern void rtems_gxx_recursive_mutex_init (__gthread_recursive_mutex_t *__mutex);
+extern int rtems_gxx_recursive_mutex_lock (__gthread_recursive_mutex_t *__mutex);
+extern int rtems_gxx_recursive_mutex_trylock (__gthread_recursive_mutex_t *__mutex);
+extern int rtems_gxx_recursive_mutex_unlock (__gthread_recursive_mutex_t *__mutex);
+
+/* RTEMS threading is always active */
+static inline int
+__gthread_active_p (void)
+{
+  return 1;
+}
+
+/* Wrapper calls */
+static inline int
+__gthread_once (__gthread_once_t *__once, void (*__func) (void))
+{
+   return rtems_gxx_once( __once, __func );
+}
+
+static inline int
+__gthread_key_create (__gthread_key_t *__key, void (*__dtor) (void *))
+{
+  return rtems_gxx_key_create( __key, __dtor );
+}
+
+static inline int
+__gthread_key_delete (__gthread_key_t __key)
+{
+  return rtems_gxx_key_delete (__key);
+}
+
+static inline void *
+__gthread_getspecific (__gthread_key_t __key)
+{
+  return rtems_gxx_getspecific (__key);
+}
+
+static inline int
+__gthread_setspecific (__gthread_key_t __key, const void *__ptr)
+{
+  return rtems_gxx_setspecific (__key, __ptr);
+}
+
+static inline int
+__gthread_mutex_destroy (__gthread_mutex_t *__mutex)
+{
+  return rtems_gxx_mutex_destroy (__mutex);
+}
+
+static inline int
+__gthread_mutex_lock (__gthread_mutex_t *__mutex)
+{
+    return rtems_gxx_mutex_lock (__mutex);
+}
+
+static inline int
+__gthread_mutex_trylock (__gthread_mutex_t *__mutex)
+{
+    return rtems_gxx_mutex_trylock (__mutex);
+}
+
+static inline int
+__gthread_mutex_unlock (__gthread_mutex_t *__mutex)
+{
+    return rtems_gxx_mutex_unlock( __mutex );
+}
+
+static inline int
+__gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *__mutex)
+{
+    return rtems_gxx_recursive_mutex_lock (__mutex);
+}
+
+static inline int
+__gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *__mutex)
+{
+    return rtems_gxx_recursive_mutex_trylock (__mutex);
+}
+
+static inline int
+__gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *__mutex)
+{
+    return rtems_gxx_recursive_mutex_unlock( __mutex );
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* ! GCC_GTHR_RTEMS_H */
diff --git a/libgcc/config/gthr-vxworks.h b/libgcc/config/gthr-vxworks.h
new file mode 100644
index 00000000000..2346b528660
--- /dev/null
+++ b/libgcc/config/gthr-vxworks.h
@@ -0,0 +1,170 @@
+/* Threads compatibility routines for libgcc2 and libobjc for VxWorks.  */
+/* Compile this one with gcc.  */
+/* Copyright (C) 1997, 1999, 2000, 2008, 2009, 2011
+   Free Software Foundation, Inc.
+   Contributed by Mike Stump <mrs@wrs.com>.
+
+This file is part of GCC.
+
+GCC 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, or (at your option) any later
+version.
+
+GCC 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.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+#ifndef GCC_GTHR_VXWORKS_H
+#define GCC_GTHR_VXWORKS_H
+
+#ifdef _LIBOBJC
+
+/* libobjc requires the optional pthreads component.  */
+#include "config/gthr-posix.h"
+
+#else
+#ifdef __cplusplus
+#define UNUSED(x)
+#else
+#define UNUSED(x) x __attribute__((unused))
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define __GTHREADS 1
+#define __gthread_active_p() 1
+
+/* Mutexes are easy, except that they need to be initialized at runtime.  */
+
+#include <semLib.h>
+
+typedef SEM_ID __gthread_mutex_t;
+/* All VxWorks mutexes are recursive.  */
+typedef SEM_ID __gthread_recursive_mutex_t;
+#define __GTHREAD_MUTEX_INIT_FUNCTION __gthread_mutex_init_function
+#define __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION __gthread_recursive_mutex_init_function
+
+static inline void
+__gthread_mutex_init_function (__gthread_mutex_t *mutex)
+{
+  *mutex = semMCreate (SEM_Q_PRIORITY | SEM_INVERSION_SAFE | SEM_DELETE_SAFE);
+}
+
+static inline int
+__gthread_mutex_destroy (__gthread_mutex_t * UNUSED(mutex))
+{
+  return 0;
+}
+
+static inline int
+__gthread_mutex_lock (__gthread_mutex_t *mutex)
+{
+  return semTake (*mutex, WAIT_FOREVER);
+}
+
+static inline int
+__gthread_mutex_trylock (__gthread_mutex_t *mutex)
+{
+  return semTake (*mutex, NO_WAIT);
+}
+
+static inline int
+__gthread_mutex_unlock (__gthread_mutex_t *mutex)
+{
+  return semGive (*mutex);
+}
+
+static inline void
+__gthread_recursive_mutex_init_function (__gthread_recursive_mutex_t *mutex)
+{
+  __gthread_mutex_init_function (mutex);
+}
+
+static inline int
+__gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *mutex)
+{
+  return __gthread_mutex_lock (mutex);
+}
+
+static inline int
+__gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *mutex)
+{
+  return __gthread_mutex_trylock (mutex);
+}
+
+static inline int
+__gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *mutex)
+{
+  return __gthread_mutex_unlock (mutex);
+}
+
+/* pthread_once is complicated enough that it's implemented
+   out-of-line.  See config/vxlib.c.  */
+
+typedef struct
+{
+#if !defined(__RTP__)
+#if defined(__PPC__)
+  __attribute ((aligned (__alignof (unsigned))))
+#endif
+  volatile unsigned char busy;
+#endif
+  volatile unsigned char done;
+#if !defined(__RTP__) && defined(__PPC__)
+  /* PPC's test-and-set implementation requires a 4 byte aligned
+     object, of which it only sets the first byte.  We use padding
+     here, in order to maintain some amount of backwards
+     compatibility.  Without this padding, gthread_once objects worked
+     by accident because they happen to be static objects and the ppc
+     port automatically increased their alignment to 4 bytes.  */
+  unsigned char pad1;
+  unsigned char pad2;
+#endif
+}
+__gthread_once_t;
+
+#if defined (__RTP__)
+# define __GTHREAD_ONCE_INIT { 0 }
+#elif defined (__PPC__)
+# define __GTHREAD_ONCE_INIT { 0, 0, 0, 0 }
+#else
+# define __GTHREAD_ONCE_INIT { 0, 0 }
+#endif
+
+extern int __gthread_once (__gthread_once_t *__once, void (*__func)(void));
+
+/* Thread-specific data requires a great deal of effort, since VxWorks
+   is not really set up for it.  See config/vxlib.c for the gory
+   details.  All the TSD routines are sufficiently complex that they
+   need to be implemented out of line.  */
+
+typedef unsigned int __gthread_key_t;
+
+extern int __gthread_key_create (__gthread_key_t *__keyp, void (*__dtor)(void *));
+extern int __gthread_key_delete (__gthread_key_t __key);
+
+extern void *__gthread_getspecific (__gthread_key_t __key);
+extern int __gthread_setspecific (__gthread_key_t __key, void *__ptr);
+
+#undef UNUSED
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* not _LIBOBJC */
+
+#endif /* gthr-vxworks.h */
diff --git a/libgcc/config/i386/gthr-win32.c b/libgcc/config/i386/gthr-win32.c
index 46ecb0d4b26..ab1b69fd4cf 100644
--- a/libgcc/config/i386/gthr-win32.c
+++ b/libgcc/config/i386/gthr-win32.c
@@ -1,7 +1,8 @@
 /* Implementation of W32-specific threads compatibility routines for
    libgcc2.  */
 
-/* Copyright (C) 1999, 2000, 2002, 2004, 2008, 2009 Free Software Foundation, Inc.
+/* Copyright (C) 1999, 2000, 2002, 2004, 2008, 2009, 2011
+   Free Software Foundation, Inc.
    Contributed by Mumit Khan <khan@xraylith.wisc.edu>.
    Modified and moved to separate file by Danny Smith
    <dannysmith@users.sourceforge.net>.
@@ -33,7 +34,7 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 #endif
 #undef  __GTHREAD_I486_INLINE_LOCK_PRIMITIVES
 #define __GTHREAD_I486_INLINE_LOCK_PRIMITIVES
-#include <gthr-win32.h>
+#include "gthr-win32.h"
 
 /* Windows32 threads specific definitions. The windows32 threading model
    does not map well into pthread-inspired gcc's threading model, and so 
diff --git a/libgcc/config/i386/gthr-win32.h b/libgcc/config/i386/gthr-win32.h
new file mode 100644
index 00000000000..53f8396cc81
--- /dev/null
+++ b/libgcc/config/i386/gthr-win32.h
@@ -0,0 +1,772 @@
+/* Threads compatibility routines for libgcc2 and libobjc.  */
+/* Compile this one with gcc.  */
+
+/* Copyright (C) 1999, 2000, 2002, 2003, 2004, 2005, 2008, 2009
+   Free Software Foundation, Inc.
+   Contributed by Mumit Khan <khan@xraylith.wisc.edu>.
+
+This file is part of GCC.
+
+GCC 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, or (at your option) any later
+version.
+
+GCC 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.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+#ifndef GCC_GTHR_WIN32_H
+#define GCC_GTHR_WIN32_H
+
+/* Make sure CONST_CAST2 (origin in system.h) is declared.  */
+#ifndef CONST_CAST2
+#define CONST_CAST2(TOTYPE,FROMTYPE,X) ((__extension__(union {FROMTYPE _q; TOTYPE _nq;})(X))._nq)
+#endif
+
+/* Windows32 threads specific definitions. The windows32 threading model
+   does not map well into pthread-inspired gcc's threading model, and so
+   there are caveats one needs to be aware of.
+
+   1. The destructor supplied to __gthread_key_create is ignored for
+      generic x86-win32 ports. This will certainly cause memory leaks
+      due to unreclaimed eh contexts (sizeof (eh_context) is at least
+      24 bytes for x86 currently).
+
+      This memory leak may be significant for long-running applications
+      that make heavy use of C++ EH.
+
+      However, Mingw runtime (version 0.3 or newer) provides a mechanism
+      to emulate pthreads key dtors; the runtime provides a special DLL,
+      linked in if -mthreads option is specified, that runs the dtors in
+      the reverse order of registration when each thread exits. If
+      -mthreads option is not given, a stub is linked in instead of the
+      DLL, which results in memory leak. Other x86-win32 ports can use
+      the same technique of course to avoid the leak.
+
+   2. The error codes returned are non-POSIX like, and cast into ints.
+      This may cause incorrect error return due to truncation values on
+      hw where sizeof (DWORD) > sizeof (int).
+
+   3. We are currently using a special mutex instead of the Critical
+      Sections, since Win9x does not support TryEnterCriticalSection
+      (while NT does).
+
+   The basic framework should work well enough. In the long term, GCC
+   needs to use Structured Exception Handling on Windows32.  */
+
+#define __GTHREADS 1
+
+#include <errno.h>
+#ifdef __MINGW32__
+#include <_mingw.h>
+#endif
+
+#ifndef __UNUSED_PARAM
+#define __UNUSED_PARAM(x) x
+#endif
+
+#ifdef _LIBOBJC
+
+/* This is necessary to prevent windef.h (included from windows.h) from
+   defining its own BOOL as a typedef.  */
+#ifndef __OBJC__
+#define __OBJC__
+#endif
+#include <windows.h>
+/* Now undef the windows BOOL.  */
+#undef BOOL
+
+/* Key structure for maintaining thread specific storage */
+static DWORD	__gthread_objc_data_tls = (DWORD) -1;
+
+/* Backend initialization functions */
+
+/* Initialize the threads subsystem.  */
+int
+__gthread_objc_init_thread_system (void)
+{
+  /* Initialize the thread storage key.  */
+  if ((__gthread_objc_data_tls = TlsAlloc ()) != (DWORD) -1)
+    return 0;
+  else
+    return -1;
+}
+
+/* Close the threads subsystem.  */
+int
+__gthread_objc_close_thread_system (void)
+{
+  if (__gthread_objc_data_tls != (DWORD) -1)
+    TlsFree (__gthread_objc_data_tls);
+  return 0;
+}
+
+/* Backend thread functions */
+
+/* Create a new thread of execution.  */
+objc_thread_t
+__gthread_objc_thread_detach (void (*func)(void *arg), void *arg)
+{
+  DWORD	thread_id = 0;
+  HANDLE win32_handle;
+
+  if (!(win32_handle = CreateThread (NULL, 0, (LPTHREAD_START_ROUTINE) func,
+				     arg, 0, &thread_id)))
+    thread_id = 0;
+
+  return (objc_thread_t) (INT_PTR) thread_id;
+}
+
+/* Set the current thread's priority.  */
+int
+__gthread_objc_thread_set_priority (int priority)
+{
+  int sys_priority = 0;
+
+  switch (priority)
+    {
+    case OBJC_THREAD_INTERACTIVE_PRIORITY:
+      sys_priority = THREAD_PRIORITY_NORMAL;
+      break;
+    default:
+    case OBJC_THREAD_BACKGROUND_PRIORITY:
+      sys_priority = THREAD_PRIORITY_BELOW_NORMAL;
+      break;
+    case OBJC_THREAD_LOW_PRIORITY:
+      sys_priority = THREAD_PRIORITY_LOWEST;
+      break;
+    }
+
+  /* Change priority */
+  if (SetThreadPriority (GetCurrentThread (), sys_priority))
+    return 0;
+  else
+    return -1;
+}
+
+/* Return the current thread's priority.  */
+int
+__gthread_objc_thread_get_priority (void)
+{
+  int sys_priority;
+
+  sys_priority = GetThreadPriority (GetCurrentThread ());
+
+  switch (sys_priority)
+    {
+    case THREAD_PRIORITY_HIGHEST:
+    case THREAD_PRIORITY_TIME_CRITICAL:
+    case THREAD_PRIORITY_ABOVE_NORMAL:
+    case THREAD_PRIORITY_NORMAL:
+      return OBJC_THREAD_INTERACTIVE_PRIORITY;
+
+    default:
+    case THREAD_PRIORITY_BELOW_NORMAL:
+      return OBJC_THREAD_BACKGROUND_PRIORITY;
+
+    case THREAD_PRIORITY_IDLE:
+    case THREAD_PRIORITY_LOWEST:
+      return OBJC_THREAD_LOW_PRIORITY;
+    }
+
+  /* Couldn't get priority.  */
+  return -1;
+}
+
+/* Yield our process time to another thread.  */
+void
+__gthread_objc_thread_yield (void)
+{
+  Sleep (0);
+}
+
+/* Terminate the current thread.  */
+int
+__gthread_objc_thread_exit (void)
+{
+  /* exit the thread */
+  ExitThread (__objc_thread_exit_status);
+
+  /* Failed if we reached here */
+  return -1;
+}
+
+/* Returns an integer value which uniquely describes a thread.  */
+objc_thread_t
+__gthread_objc_thread_id (void)
+{
+  return (objc_thread_t) (INT_PTR) GetCurrentThreadId ();
+}
+
+/* Sets the thread's local storage pointer.  */
+int
+__gthread_objc_thread_set_data (void *value)
+{
+  if (TlsSetValue (__gthread_objc_data_tls, value))
+    return 0;
+  else
+    return -1;
+}
+
+/* Returns the thread's local storage pointer.  */
+void *
+__gthread_objc_thread_get_data (void)
+{
+  DWORD lasterror;
+  void *ptr;
+
+  lasterror = GetLastError ();
+
+  ptr = TlsGetValue (__gthread_objc_data_tls);          /* Return thread data.  */
+
+  SetLastError (lasterror);
+
+  return ptr;
+}
+
+/* Backend mutex functions */
+
+/* Allocate a mutex.  */
+int
+__gthread_objc_mutex_allocate (objc_mutex_t mutex)
+{
+  if ((mutex->backend = (void *) CreateMutex (NULL, 0, NULL)) == NULL)
+    return -1;
+  else
+    return 0;
+}
+
+/* Deallocate a mutex.  */
+int
+__gthread_objc_mutex_deallocate (objc_mutex_t mutex)
+{
+  CloseHandle ((HANDLE) (mutex->backend));
+  return 0;
+}
+
+/* Grab a lock on a mutex.  */
+int
+__gthread_objc_mutex_lock (objc_mutex_t mutex)
+{
+  int status;
+
+  status = WaitForSingleObject ((HANDLE) (mutex->backend), INFINITE);
+  if (status != WAIT_OBJECT_0 && status != WAIT_ABANDONED)
+    return -1;
+  else
+    return 0;
+}
+
+/* Try to grab a lock on a mutex.  */
+int
+__gthread_objc_mutex_trylock (objc_mutex_t mutex)
+{
+  int status;
+
+  status = WaitForSingleObject ((HANDLE) (mutex->backend), 0);
+  if (status != WAIT_OBJECT_0 && status != WAIT_ABANDONED)
+    return -1;
+  else
+    return 0;
+}
+
+/* Unlock the mutex */
+int
+__gthread_objc_mutex_unlock (objc_mutex_t mutex)
+{
+  if (ReleaseMutex ((HANDLE) (mutex->backend)) == 0)
+    return -1;
+  else
+    return 0;
+}
+
+/* Backend condition mutex functions */
+
+/* Allocate a condition.  */
+int
+__gthread_objc_condition_allocate (objc_condition_t __UNUSED_PARAM(condition))
+{
+  /* Unimplemented.  */
+  return -1;
+}
+
+/* Deallocate a condition.  */
+int
+__gthread_objc_condition_deallocate (objc_condition_t __UNUSED_PARAM(condition))
+{
+  /* Unimplemented.  */
+  return -1;
+}
+
+/* Wait on the condition */
+int
+__gthread_objc_condition_wait (objc_condition_t __UNUSED_PARAM(condition),
+			       objc_mutex_t __UNUSED_PARAM(mutex))
+{
+  /* Unimplemented.  */
+  return -1;
+}
+
+/* Wake up all threads waiting on this condition.  */
+int
+__gthread_objc_condition_broadcast (objc_condition_t __UNUSED_PARAM(condition))
+{
+  /* Unimplemented.  */
+  return -1;
+}
+
+/* Wake up one thread waiting on this condition.  */
+int
+__gthread_objc_condition_signal (objc_condition_t __UNUSED_PARAM(condition))
+{
+  /* Unimplemented.  */
+  return -1;
+}
+
+#else /* _LIBOBJC */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef unsigned long __gthread_key_t;
+
+typedef struct {
+  int done;
+  long started;
+} __gthread_once_t;
+
+typedef struct {
+  long counter;
+  void *sema;
+} __gthread_mutex_t;
+
+typedef struct {
+  long counter;
+  long depth;
+  unsigned long owner;
+  void *sema;
+} __gthread_recursive_mutex_t;
+
+#define __GTHREAD_ONCE_INIT {0, -1}
+#define __GTHREAD_MUTEX_INIT_FUNCTION __gthread_mutex_init_function
+#define __GTHREAD_MUTEX_INIT_DEFAULT {-1, 0}
+#define __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION \
+  __gthread_recursive_mutex_init_function
+#define __GTHREAD_RECURSIVE_MUTEX_INIT_DEFAULT {-1, 0, 0, 0}
+
+#if defined (_WIN32) && !defined(__CYGWIN__)
+#define MINGW32_SUPPORTS_MT_EH 1
+/* Mingw runtime >= v0.3 provides a magic variable that is set to nonzero
+   if -mthreads option was specified, or 0 otherwise. This is to get around
+   the lack of weak symbols in PE-COFF.  */
+extern int _CRT_MT;
+extern int __mingwthr_key_dtor (unsigned long, void (*) (void *));
+#endif /* _WIN32 && !__CYGWIN__ */
+
+/* The Windows95 kernel does not export InterlockedCompareExchange.
+   This provides a substitute.   When building apps that reference
+   gthread_mutex_try_lock, the  __GTHREAD_I486_INLINE_LOCK_PRIMITIVES
+   macro  must be defined if Windows95 is a target.  Currently
+   gthread_mutex_try_lock is not referenced by libgcc or libstdc++.  */
+#ifdef __GTHREAD_I486_INLINE_LOCK_PRIMITIVES
+static inline long
+__gthr_i486_lock_cmp_xchg(long *__dest, long __xchg, long __comperand)
+{
+  long result;
+  __asm__ __volatile__ ("\n\
+	lock\n\
+	cmpxchg{l} {%4, %1|%1, %4}\n"
+	: "=a" (result), "=m" (*__dest)
+	: "0" (__comperand), "m" (*__dest), "r" (__xchg)
+	: "cc");
+  return result;
+}
+#define __GTHR_W32_InterlockedCompareExchange __gthr_i486_lock_cmp_xchg
+#else  /* __GTHREAD_I486_INLINE_LOCK_PRIMITIVES */
+#define __GTHR_W32_InterlockedCompareExchange InterlockedCompareExchange
+#endif /* __GTHREAD_I486_INLINE_LOCK_PRIMITIVES */
+
+static inline int
+__gthread_active_p (void)
+{
+#ifdef MINGW32_SUPPORTS_MT_EH
+  return _CRT_MT;
+#else
+  return 1;
+#endif
+}
+
+#if __GTHREAD_HIDE_WIN32API
+
+/* The implementations are in config/i386/gthr-win32.c in libgcc.a.
+   Only stubs are exposed to avoid polluting the C++ namespace with
+   windows api definitions.  */
+
+extern int __gthr_win32_once (__gthread_once_t *, void (*) (void));
+extern int __gthr_win32_key_create (__gthread_key_t *, void (*) (void*));
+extern int __gthr_win32_key_delete (__gthread_key_t);
+extern void * __gthr_win32_getspecific (__gthread_key_t);
+extern int __gthr_win32_setspecific (__gthread_key_t, const void *);
+extern void __gthr_win32_mutex_init_function (__gthread_mutex_t *);
+extern int __gthr_win32_mutex_lock (__gthread_mutex_t *);
+extern int __gthr_win32_mutex_trylock (__gthread_mutex_t *);
+extern int __gthr_win32_mutex_unlock (__gthread_mutex_t *);
+extern void
+  __gthr_win32_recursive_mutex_init_function (__gthread_recursive_mutex_t *);
+extern int __gthr_win32_recursive_mutex_lock (__gthread_recursive_mutex_t *);
+extern int
+  __gthr_win32_recursive_mutex_trylock (__gthread_recursive_mutex_t *);
+extern int __gthr_win32_recursive_mutex_unlock (__gthread_recursive_mutex_t *);
+extern void __gthr_win32_mutex_destroy (__gthread_mutex_t *);
+
+static inline int
+__gthread_once (__gthread_once_t *__once, void (*__func) (void))
+{
+  if (__gthread_active_p ())
+    return __gthr_win32_once (__once, __func);
+  else
+    return -1;
+}
+
+static inline int
+__gthread_key_create (__gthread_key_t *__key, void (*__dtor) (void *))
+{
+  return __gthr_win32_key_create (__key, __dtor);
+}
+
+static inline int
+__gthread_key_delete (__gthread_key_t __key)
+{
+  return __gthr_win32_key_delete (__key);
+}
+
+static inline void *
+__gthread_getspecific (__gthread_key_t __key)
+{
+  return __gthr_win32_getspecific (__key);
+}
+
+static inline int
+__gthread_setspecific (__gthread_key_t __key, const void *__ptr)
+{
+  return __gthr_win32_setspecific (__key, __ptr);
+}
+
+static inline void
+__gthread_mutex_init_function (__gthread_mutex_t *__mutex)
+{
+  __gthr_win32_mutex_init_function (__mutex);
+}
+
+static inline void
+__gthread_mutex_destroy (__gthread_mutex_t *__mutex)
+{
+  __gthr_win32_mutex_destroy (__mutex);
+}
+
+static inline int
+__gthread_mutex_lock (__gthread_mutex_t *__mutex)
+{
+  if (__gthread_active_p ())
+    return __gthr_win32_mutex_lock (__mutex);
+  else
+    return 0;
+}
+
+static inline int
+__gthread_mutex_trylock (__gthread_mutex_t *__mutex)
+{
+  if (__gthread_active_p ())
+    return __gthr_win32_mutex_trylock (__mutex);
+  else
+    return 0;
+}
+
+static inline int
+__gthread_mutex_unlock (__gthread_mutex_t *__mutex)
+{
+  if (__gthread_active_p ())
+    return __gthr_win32_mutex_unlock (__mutex);
+  else
+    return 0;
+}
+
+static inline void
+__gthread_recursive_mutex_init_function (__gthread_recursive_mutex_t *__mutex)
+{
+   __gthr_win32_recursive_mutex_init_function (__mutex);
+}
+
+static inline int
+__gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *__mutex)
+{
+  if (__gthread_active_p ())
+    return __gthr_win32_recursive_mutex_lock (__mutex);
+  else
+    return 0;
+}
+
+static inline int
+__gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *__mutex)
+{
+  if (__gthread_active_p ())
+    return __gthr_win32_recursive_mutex_trylock (__mutex);
+  else
+    return 0;
+}
+
+static inline int
+__gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *__mutex)
+{
+  if (__gthread_active_p ())
+    return __gthr_win32_recursive_mutex_unlock (__mutex);
+  else
+    return 0;
+}
+
+#else /* ! __GTHREAD_HIDE_WIN32API */
+
+#include <windows.h>
+#include <errno.h>
+
+static inline int
+__gthread_once (__gthread_once_t *__once, void (*__func) (void))
+{
+  if (! __gthread_active_p ())
+    return -1;
+  else if (__once == NULL || __func == NULL)
+    return EINVAL;
+
+  if (! __once->done)
+    {
+      if (InterlockedIncrement (&(__once->started)) == 0)
+	{
+	  (*__func) ();
+	  __once->done = TRUE;
+	}
+      else
+	{
+	  /* Another thread is currently executing the code, so wait for it
+	     to finish; yield the CPU in the meantime.  If performance
+	     does become an issue, the solution is to use an Event that
+	     we wait on here (and set above), but that implies a place to
+	     create the event before this routine is called.  */
+	  while (! __once->done)
+	    Sleep (0);
+	}
+    }
+
+  return 0;
+}
+
+/* Windows32 thread local keys don't support destructors; this leads to
+   leaks, especially in threaded applications making extensive use of
+   C++ EH. Mingw uses a thread-support DLL to work-around this problem.  */
+static inline int
+__gthread_key_create (__gthread_key_t *__key,
+		      void (*__dtor) (void *) __attribute__((unused)))
+{
+  int __status = 0;
+  DWORD __tls_index = TlsAlloc ();
+  if (__tls_index != 0xFFFFFFFF)
+    {
+      *__key = __tls_index;
+#ifdef MINGW32_SUPPORTS_MT_EH
+      /* Mingw runtime will run the dtors in reverse order for each thread
+         when the thread exits.  */
+      __status = __mingwthr_key_dtor (*__key, __dtor);
+#endif
+    }
+  else
+    __status = (int) GetLastError ();
+  return __status;
+}
+
+static inline int
+__gthread_key_delete (__gthread_key_t __key)
+{
+  return (TlsFree (__key) != 0) ? 0 : (int) GetLastError ();
+}
+
+static inline void *
+__gthread_getspecific (__gthread_key_t __key)
+{
+  DWORD __lasterror;
+  void *__ptr;
+
+  __lasterror = GetLastError ();
+
+  __ptr = TlsGetValue (__key);
+
+  SetLastError (__lasterror);
+
+  return __ptr;
+}
+
+static inline int
+__gthread_setspecific (__gthread_key_t __key, const void *__ptr)
+{
+  if (TlsSetValue (__key, CONST_CAST2(void *, const void *, __ptr)) != 0)
+    return 0;
+  else
+    return GetLastError ();
+}
+
+static inline void
+__gthread_mutex_init_function (__gthread_mutex_t *__mutex)
+{
+  __mutex->counter = -1;
+  __mutex->sema = CreateSemaphore (NULL, 0, 65535, NULL);
+}
+
+static inline void
+__gthread_mutex_destroy (__gthread_mutex_t *__mutex)
+{
+  CloseHandle ((HANDLE) __mutex->sema);
+}
+
+static inline int
+__gthread_mutex_lock (__gthread_mutex_t *__mutex)
+{
+  int __status = 0;
+
+  if (__gthread_active_p ())
+    {
+      if (InterlockedIncrement (&__mutex->counter) == 0 ||
+	  WaitForSingleObject (__mutex->sema, INFINITE) == WAIT_OBJECT_0)
+	__status = 0;
+      else
+	{
+	  /* WaitForSingleObject returns WAIT_FAILED, and we can only do
+	     some best-effort cleanup here.  */
+	  InterlockedDecrement (&__mutex->counter);
+	  __status = 1;
+	}
+    }
+  return __status;
+}
+
+static inline int
+__gthread_mutex_trylock (__gthread_mutex_t *__mutex)
+{
+  int __status = 0;
+
+  if (__gthread_active_p ())
+    {
+      if (__GTHR_W32_InterlockedCompareExchange (&__mutex->counter, 0, -1) < 0)
+	__status = 0;
+      else
+	__status = 1;
+    }
+  return __status;
+}
+
+static inline int
+__gthread_mutex_unlock (__gthread_mutex_t *__mutex)
+{
+  if (__gthread_active_p ())
+    {
+      if (InterlockedDecrement (&__mutex->counter) >= 0)
+	return ReleaseSemaphore (__mutex->sema, 1, NULL) ? 0 : 1;
+    }
+  return 0;
+}
+
+static inline void
+__gthread_recursive_mutex_init_function (__gthread_recursive_mutex_t *__mutex)
+{
+  __mutex->counter = -1;
+  __mutex->depth = 0;
+  __mutex->owner = 0;
+  __mutex->sema = CreateSemaphore (NULL, 0, 65535, NULL);
+}
+
+static inline int
+__gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *__mutex)
+{
+  if (__gthread_active_p ())
+    {
+      DWORD __me = GetCurrentThreadId();
+      if (InterlockedIncrement (&__mutex->counter) == 0)
+	{
+	  __mutex->depth = 1;
+	  __mutex->owner = __me;
+	}
+      else if (__mutex->owner == __me)
+	{
+	  InterlockedDecrement (&__mutex->counter);
+	  ++(__mutex->depth);
+	}
+      else if (WaitForSingleObject (__mutex->sema, INFINITE) == WAIT_OBJECT_0)
+	{
+	  __mutex->depth = 1;
+	  __mutex->owner = __me;
+	}
+      else
+	{
+	  /* WaitForSingleObject returns WAIT_FAILED, and we can only do
+	     some best-effort cleanup here.  */
+	  InterlockedDecrement (&__mutex->counter);
+	  return 1;
+	}
+    }
+  return 0;
+}
+
+static inline int
+__gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *__mutex)
+{
+  if (__gthread_active_p ())
+    {
+      DWORD __me = GetCurrentThreadId();
+      if (__GTHR_W32_InterlockedCompareExchange (&__mutex->counter, 0, -1) < 0)
+	{
+	  __mutex->depth = 1;
+	  __mutex->owner = __me;
+	}
+      else if (__mutex->owner == __me)
+	++(__mutex->depth);
+      else
+	return 1;
+    }
+  return 0;
+}
+
+static inline int
+__gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *__mutex)
+{
+  if (__gthread_active_p ())
+    {
+      --(__mutex->depth);
+      if (__mutex->depth == 0)
+	{
+	  __mutex->owner = 0;
+
+	  if (InterlockedDecrement (&__mutex->counter) >= 0)
+	    return ReleaseSemaphore (__mutex->sema, 1, NULL) ? 0 : 1;
+	}
+    }
+  return 0;
+}
+
+#endif /*  __GTHREAD_HIDE_WIN32API */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _LIBOBJC */
+
+#endif /* ! GCC_GTHR_WIN32_H */
diff --git a/libgcc/config/mips/gthr-mipssde.h b/libgcc/config/mips/gthr-mipssde.h
new file mode 100644
index 00000000000..34f9b6cf54b
--- /dev/null
+++ b/libgcc/config/mips/gthr-mipssde.h
@@ -0,0 +1,230 @@
+/* MIPS SDE threads compatibility routines for libgcc2 and libobjc.  */
+/* Compile this one with gcc.  */
+/* Copyright (C) 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
+   Contributed by Nigel Stephens <nigel@mips.com>
+
+This file is part of GCC.
+
+GCC 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, or (at your option) any later
+version.
+
+GCC 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.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+#ifndef GCC_GTHR_MIPSSDE_H
+#define GCC_GTHR_MIPSSDE_H
+
+/* MIPS SDE threading API specific definitions.
+   Easy, since the interface is pretty much one-to-one.  */
+
+#define __GTHREADS 1
+
+#include <sdethread.h>
+#include <unistd.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef __sdethread_key_t __gthread_key_t;
+typedef __sdethread_once_t __gthread_once_t;
+typedef __sdethread_mutex_t __gthread_mutex_t;
+
+typedef struct {
+  long depth;
+  __sdethread_t owner;
+  __sdethread_mutex_t actual;
+} __gthread_recursive_mutex_t;
+
+#define __GTHREAD_MUTEX_INIT __SDETHREAD_MUTEX_INITIALIZER("gthr")
+#define __GTHREAD_ONCE_INIT __SDETHREAD_ONCE_INIT
+static inline int
+__gthread_recursive_mutex_init_function(__gthread_recursive_mutex_t *__mutex);
+#define __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION __gthread_recursive_mutex_init_function
+
+#if SUPPORTS_WEAK && GTHREAD_USE_WEAK
+# define __gthrw(name) \
+  static __typeof(name) __gthrw_ ## name __attribute__ ((__weakref__(#name)));
+# define __gthrw_(name) __gthrw_ ## name
+#else
+# define __gthrw(name)
+# define __gthrw_(name) name
+#endif
+
+__gthrw(__sdethread_once)
+__gthrw(__sdethread_key_create)
+__gthrw(__sdethread_key_delete)
+__gthrw(__sdethread_getspecific)
+__gthrw(__sdethread_setspecific)
+
+__gthrw(__sdethread_self)
+
+__gthrw(__sdethread_mutex_lock)
+__gthrw(__sdethread_mutex_trylock)
+__gthrw(__sdethread_mutex_unlock)
+
+__gthrw(__sdethread_mutex_init)
+
+__gthrw(__sdethread_threading)
+
+#if SUPPORTS_WEAK && GTHREAD_USE_WEAK
+
+static inline int
+__gthread_active_p (void)
+{
+  return !!(void *)&__sdethread_threading;
+}
+
+#else /* not SUPPORTS_WEAK */
+
+static inline int
+__gthread_active_p (void)
+{
+  return 1;
+}
+
+#endif /* SUPPORTS_WEAK */
+
+static inline int
+__gthread_once (__gthread_once_t *__once, void (*__func) (void))
+{
+  if (__gthread_active_p ())
+    return __gthrw_(__sdethread_once) (__once, __func);
+  else
+    return -1;
+}
+
+static inline int
+__gthread_key_create (__gthread_key_t *__key, void (*__dtor) (void *))
+{
+  return __gthrw_(__sdethread_key_create) (__key, __dtor);
+}
+
+static inline int
+__gthread_key_delete (__gthread_key_t __key)
+{
+  return __gthrw_(__sdethread_key_delete) (__key);
+}
+
+static inline void *
+__gthread_getspecific (__gthread_key_t __key)
+{
+  return __gthrw_(__sdethread_getspecific) (__key);
+}
+
+static inline int
+__gthread_setspecific (__gthread_key_t __key, const void *__ptr)
+{
+  return __gthrw_(__sdethread_setspecific) (__key, __ptr);
+}
+
+static inline int
+__gthread_mutex_destroy (__gthread_mutex_t * UNUSED(__mutex))
+{
+  return 0;
+}
+
+static inline int
+__gthread_mutex_lock (__gthread_mutex_t *__mutex)
+{
+  if (__gthread_active_p ())
+    return __gthrw_(__sdethread_mutex_lock) (__mutex);
+  else
+    return 0;
+}
+
+static inline int
+__gthread_mutex_trylock (__gthread_mutex_t *__mutex)
+{
+  if (__gthread_active_p ())
+    return __gthrw_(__sdethread_mutex_trylock) (__mutex);
+  else
+    return 0;
+}
+
+static inline int
+__gthread_mutex_unlock (__gthread_mutex_t *__mutex)
+{
+  if (__gthread_active_p ())
+    return __gthrw_(__sdethread_mutex_unlock) (__mutex);
+  else
+    return 0;
+}
+
+static inline int
+__gthread_recursive_mutex_init_function (__gthread_recursive_mutex_t *__mutex)
+{
+  __mutex->depth = 0;
+  __mutex->owner = __gthrw_(__sdethread_self) ();
+  return __gthrw_(__sdethread_mutex_init) (&__mutex->actual, NULL);
+}
+
+static inline int
+__gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *__mutex)
+{
+  if (__gthread_active_p ())
+    {
+      __sdethread_t __me = __gthrw_(__sdethread_self) ();
+
+      if (__mutex->owner != __me)
+	{
+	  __gthrw_(__sdethread_mutex_lock) (&__mutex->actual);
+	  __mutex->owner = __me;
+	}
+
+      __mutex->depth++;
+    }
+  return 0;
+}
+
+static inline int
+__gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *__mutex)
+{
+  if (__gthread_active_p ())
+    {
+      __sdethread_t __me = __gthrw_(__sdethread_self) ();
+
+      if (__mutex->owner != __me)
+	{
+	  if (__gthrw_(__sdethread_mutex_trylock) (&__mutex->actual))
+	    return 1;
+	  __mutex->owner = __me;
+	}
+
+      __mutex->depth++;
+    }
+  return 0;
+}
+
+static inline int
+__gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *__mutex)
+{
+  if (__gthread_active_p ())
+    {
+      if (--__mutex->depth == 0)
+	{
+	   __mutex->owner = (__sdethread_t) 0;
+	   __gthrw_(__sdethread_mutex_unlock) (&__mutex->actual);
+	}
+    }
+  return 0;
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* ! GCC_GTHR_MIPSSDE_H */
diff --git a/libgcc/config/pa/gthr-dce.h b/libgcc/config/pa/gthr-dce.h
new file mode 100644
index 00000000000..d32155a9352
--- /dev/null
+++ b/libgcc/config/pa/gthr-dce.h
@@ -0,0 +1,563 @@
+/* Threads compatibility routines for libgcc2 and libobjc.  */
+/* Compile this one with gcc.  */
+/* Copyright (C) 1997, 1999, 2000, 2001, 2004, 2005, 2008, 2009
+   Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC 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, or (at your option) any later
+version.
+
+GCC 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.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+#ifndef GCC_GTHR_DCE_H
+#define GCC_GTHR_DCE_H
+
+/* If _DCE_THREADS is not defined, then we're building the single
+   threaded version of the libraries and do not want to reference
+   anything related to pthreads or dce.  */
+#ifndef _DCE_THREADS
+#include "gthr-single.h"
+#else
+/* DCE threads interface.
+   DCE threads are based on POSIX threads draft 4, and many things
+   have changed since then.  */
+
+/* Make sure CONST_CAST2 (original in system.h) is defined.  */
+#ifndef CONST_CAST2
+#ifdef __cplusplus
+#define CONST_CAST2(TOTYPE,FROMTYPE,X) (const_cast<TOTYPE> (X))
+#else
+#define CONST_CAST2(TOTYPE,FROMTYPE,X) ((__extension__(union {FROMTYPE _q; TOTYPE _nq;})(X))._nq)
+#endif
+#endif
+
+#define __GTHREADS 1
+
+#include <pthread.h>
+
+typedef pthread_key_t __gthread_key_t;
+typedef pthread_once_t __gthread_once_t;
+typedef pthread_mutex_t __gthread_mutex_t;
+typedef pthread_mutex_t __gthread_recursive_mutex_t;
+
+#define __GTHREAD_ONCE_INIT pthread_once_init
+
+#define __GTHREAD_MUTEX_INIT_FUNCTION __gthread_mutex_init_function
+#define __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION __gthread_recursive_mutex_init_function
+
+#define __GTHREAD_MUTEX_INIT_DEFAULT pthread_once_init
+
+#if SUPPORTS_WEAK && GTHREAD_USE_WEAK
+# define __gthrw(name) \
+  static __typeof(name) __gthrw_ ## name __attribute__ ((__weakref__(#name)));
+# define __gthrw_(name) __gthrw_ ## name
+#else
+# define __gthrw(name)
+# define __gthrw_(name) name
+#endif
+
+__gthrw(pthread_once)
+__gthrw(pthread_keycreate)
+__gthrw(pthread_getspecific)
+__gthrw(pthread_setspecific)
+__gthrw(pthread_create)
+__gthrw(pthread_mutex_init)
+__gthrw(pthread_mutex_destroy)
+__gthrw(pthread_mutex_lock)
+__gthrw(pthread_mutex_trylock)
+__gthrw(pthread_mutex_unlock)
+__gthrw(pthread_mutexattr_create)
+__gthrw(pthread_mutexattr_setkind_np)
+__gthrw(pthread_mutexattr_delete)
+
+#ifdef _LIBOBJC
+/* Objective-C.  */
+__gthrw(pthread_cond_broadcast)
+__gthrw(pthread_cond_destroy)
+__gthrw(pthread_cond_init)
+__gthrw(pthread_cond_signal)
+__gthrw(pthread_cond_wait)
+__gthrw(pthread_exit)
+
+#ifdef pthread_getunique_np
+# define __gthrw_pthread_getunique_np pthread_getunique_np
+#else
+__gthrw(pthread_getunique_np)
+# define __gthrw_pthread_getunique_np __gthrw_(pthread_getunique_np)
+#endif
+
+__gthrw(pthread_mutex_destroy)
+__gthrw(pthread_self)
+__gthrw(pthread_yield)
+#endif
+
+#if SUPPORTS_WEAK && GTHREAD_USE_WEAK
+
+static inline int
+__gthread_active_p (void)
+{
+  static void *const __gthread_active_ptr = (void *) &__gthrw_(pthread_create);
+  return __gthread_active_ptr != 0;
+}
+
+#else /* not SUPPORTS_WEAK */
+
+static inline int
+__gthread_active_p (void)
+{
+  return 1;
+}
+
+#endif /* SUPPORTS_WEAK */
+
+#ifdef _LIBOBJC
+
+/* Key structure for maintaining thread specific storage */
+static pthread_key_t _objc_thread_storage;
+
+/* Thread local storage for a single thread */
+static void *thread_local_storage = NULL;
+
+/* Backend initialization functions */
+
+/* Initialize the threads subsystem.  */
+static inline int
+__gthread_objc_init_thread_system (void)
+{
+  if (__gthread_active_p ())
+    /* Initialize the thread storage key.  */
+    return __gthrw_(pthread_keycreate) (&_objc_thread_storage, NULL);
+  else
+    return -1;
+}
+
+/* Close the threads subsystem.  */
+static inline int
+__gthread_objc_close_thread_system (void)
+{
+  if (__gthread_active_p ())
+    return 0;
+  else
+    return -1;
+}
+
+/* Backend thread functions */
+
+/* Create a new thread of execution.  */
+static inline objc_thread_t
+__gthread_objc_thread_detach (void (*func)(void *), void *arg)
+{
+  objc_thread_t thread_id;
+  pthread_t new_thread_handle;
+
+  if (!__gthread_active_p ())
+    return NULL;
+
+  if (!(__gthrw_(pthread_create) (&new_thread_handle, pthread_attr_default,
+			(void *) func, arg)))
+    {
+      /* ??? May not work! (64bit) */
+      thread_id = *(objc_thread_t *) &new_thread_handle;
+      pthread_detach (&new_thread_handle); /* Fully detach thread.  */
+    }
+  else
+    thread_id = NULL;
+
+  return thread_id;
+}
+
+/* Set the current thread's priority.  */
+static inline int
+__gthread_objc_thread_set_priority (int priority)
+{
+  int sys_priority = 0;
+
+  if (!__gthread_active_p ())
+    return -1;
+
+  switch (priority)
+    {
+    case OBJC_THREAD_INTERACTIVE_PRIORITY:
+      sys_priority = (PRI_FG_MIN_NP + PRI_FG_MAX_NP) / 2;
+      break;
+    default:
+    case OBJC_THREAD_BACKGROUND_PRIORITY:
+      sys_priority = (PRI_BG_MIN_NP + PRI_BG_MAX_NP) / 2;
+      break;
+    case OBJC_THREAD_LOW_PRIORITY:
+      sys_priority = (PRI_BG_MIN_NP + PRI_BG_MAX_NP) / 2;
+      break;
+    }
+
+  /* Change the priority.  */
+  if (pthread_setprio (__gthrw_(pthread_self) (), sys_priority) >= 0)
+    return 0;
+  else
+    /* Failed */
+    return -1;
+}
+
+/* Return the current thread's priority.  */
+static inline int
+__gthread_objc_thread_get_priority (void)
+{
+  int sys_priority;
+
+  if (__gthread_active_p ())
+    {
+      if ((sys_priority = pthread_getprio (__gthrw_(pthread_self) ())) >= 0)
+	{
+	  if (sys_priority >= PRI_FG_MIN_NP
+	      && sys_priority <= PRI_FG_MAX_NP)
+	    return OBJC_THREAD_INTERACTIVE_PRIORITY;
+	  if (sys_priority >= PRI_BG_MIN_NP
+	      && sys_priority <= PRI_BG_MAX_NP)
+	    return OBJC_THREAD_BACKGROUND_PRIORITY;
+	  return OBJC_THREAD_LOW_PRIORITY;
+	}
+
+      /* Failed */
+      return -1;
+    }
+  else
+    return OBJC_THREAD_INTERACTIVE_PRIORITY;
+}
+
+/* Yield our process time to another thread.  */
+static inline void
+__gthread_objc_thread_yield (void)
+{
+  if (__gthread_active_p ())
+    __gthrw_(pthread_yield) ();
+}
+
+/* Terminate the current thread.  */
+static inline int
+__gthread_objc_thread_exit (void)
+{
+  if (__gthread_active_p ())
+    /* exit the thread */
+    __gthrw_(pthread_exit) (&__objc_thread_exit_status);
+
+  /* Failed if we reached here */
+  return -1;
+}
+
+/* Returns an integer value which uniquely describes a thread.  */
+static inline objc_thread_t
+__gthread_objc_thread_id (void)
+{
+  if (__gthread_active_p ())
+    {
+      pthread_t self = __gthrw_(pthread_self) ();
+
+      return (objc_thread_t) __gthrw_pthread_getunique_np (&self);
+    }
+  else
+    return (objc_thread_t) 1;
+}
+
+/* Sets the thread's local storage pointer.  */
+static inline int
+__gthread_objc_thread_set_data (void *value)
+{
+  if (__gthread_active_p ())
+    return __gthrw_(pthread_setspecific) (_objc_thread_storage, value);
+  else
+    {
+      thread_local_storage = value;
+      return 0;
+    }
+}
+
+/* Returns the thread's local storage pointer.  */
+static inline void *
+__gthread_objc_thread_get_data (void)
+{
+  void *value = NULL;
+
+  if (__gthread_active_p ())
+    {
+      if (!(__gthrw_(pthread_getspecific) (_objc_thread_storage, &value)))
+	return value;
+
+      return NULL;
+    }
+  else
+    return thread_local_storage;
+}
+
+/* Backend mutex functions */
+
+/* Allocate a mutex.  */
+static inline int
+__gthread_objc_mutex_allocate (objc_mutex_t mutex)
+{
+  if (__gthread_active_p ())
+    {
+      mutex->backend = objc_malloc (sizeof (pthread_mutex_t));
+
+      if (__gthrw_(pthread_mutex_init) ((pthread_mutex_t *) mutex->backend,
+			      pthread_mutexattr_default))
+	{
+	  objc_free (mutex->backend);
+	  mutex->backend = NULL;
+	  return -1;
+	}
+    }
+
+  return 0;
+}
+
+/* Deallocate a mutex.  */
+static inline int
+__gthread_objc_mutex_deallocate (objc_mutex_t mutex)
+{
+  if (__gthread_active_p ())
+    {
+      if (__gthrw_(pthread_mutex_destroy) ((pthread_mutex_t *) mutex->backend))
+	return -1;
+
+      objc_free (mutex->backend);
+      mutex->backend = NULL;
+    }
+
+  return 0;
+}
+
+/* Grab a lock on a mutex.  */
+static inline int
+__gthread_objc_mutex_lock (objc_mutex_t mutex)
+{
+  if (__gthread_active_p ())
+    return __gthrw_(pthread_mutex_lock) ((pthread_mutex_t *) mutex->backend);
+  else
+    return 0;
+}
+
+/* Try to grab a lock on a mutex.  */
+static inline int
+__gthread_objc_mutex_trylock (objc_mutex_t mutex)
+{
+  if (__gthread_active_p ()
+      && __gthrw_(pthread_mutex_trylock) ((pthread_mutex_t *) mutex->backend) != 1)
+    return -1;
+
+  return 0;
+}
+
+/* Unlock the mutex */
+static inline int
+__gthread_objc_mutex_unlock (objc_mutex_t mutex)
+{
+  if (__gthread_active_p ())
+    return __gthrw_(pthread_mutex_unlock) ((pthread_mutex_t *) mutex->backend);
+  else
+    return 0;
+}
+
+/* Backend condition mutex functions */
+
+/* Allocate a condition.  */
+static inline int
+__gthread_objc_condition_allocate (objc_condition_t condition
+				   __attribute__ ((__unused__)))
+{
+  if (__gthread_active_p ())
+    /* Unimplemented.  */
+    return -1;
+  else
+    return 0;
+}
+
+/* Deallocate a condition.  */
+static inline int
+__gthread_objc_condition_deallocate (objc_condition_t condition
+				     __attribute__ ((__unused__)))
+{
+  if (__gthread_active_p ())
+    /* Unimplemented.  */
+    return -1;
+  else
+    return 0;
+}
+
+/* Wait on the condition */
+static inline int
+__gthread_objc_condition_wait (objc_condition_t condition
+			       __attribute__ ((__unused__)),
+			       objc_mutex_t mutex __attribute__ ((__unused__)))
+{
+  if (__gthread_active_p ())
+    /* Unimplemented.  */
+    return -1;
+  else
+    return 0;
+}
+
+/* Wake up all threads waiting on this condition.  */
+static inline int
+__gthread_objc_condition_broadcast (objc_condition_t condition
+				    __attribute__ ((__unused__)))
+{
+  if (__gthread_active_p ())
+    /* Unimplemented.  */
+    return -1;
+  else
+    return 0;
+}
+
+/* Wake up one thread waiting on this condition.  */
+static inline int
+__gthread_objc_condition_signal (objc_condition_t condition
+				 __attribute__ ((__unused__)))
+{
+  if (__gthread_active_p ())
+    /* Unimplemented.  */
+    return -1;
+  else
+    return 0;
+}
+
+#else /* _LIBOBJC */
+
+static inline int
+__gthread_once (__gthread_once_t *__once, void (*__func) (void))
+{
+  if (__gthread_active_p ())
+    return __gthrw_(pthread_once) (__once, __func);
+  else
+    return -1;
+}
+
+static inline int
+__gthread_key_create (__gthread_key_t *__key, void (*__dtor) (void *))
+{
+  return __gthrw_(pthread_keycreate) (__key, __dtor);
+}
+
+static inline int
+__gthread_key_delete (__gthread_key_t __key __attribute__ ((__unused__)))
+{
+  /* Operation is not supported.  */
+  return -1;
+}
+
+static inline void *
+__gthread_getspecific (__gthread_key_t __key)
+{
+  void *__ptr;
+  if (__gthrw_(pthread_getspecific) (__key, &__ptr) == 0)
+    return __ptr;
+  else
+    return 0;
+}
+
+static inline int
+__gthread_setspecific (__gthread_key_t __key, const void *__ptr)
+{
+  return __gthrw_(pthread_setspecific)
+    (__key, CONST_CAST2(void *, const void *, __ptr));
+}
+
+static inline void
+__gthread_mutex_init_function (__gthread_mutex_t *__mutex)
+{
+  if (__gthread_active_p ())
+    __gthrw_(pthread_mutex_init) (__mutex, pthread_mutexattr_default);
+}
+
+static inline int
+__gthread_mutex_destroy (__gthread_mutex_t *__mutex)
+{
+  if (__gthread_active_p ())
+    return __gthrw_(pthread_mutex_destroy) (__mutex);
+  else
+    return 0;
+}
+
+static inline int
+__gthread_mutex_lock (__gthread_mutex_t *__mutex)
+{
+  if (__gthread_active_p ())
+    return __gthrw_(pthread_mutex_lock) (__mutex);
+  else
+    return 0;
+}
+
+static inline int
+__gthread_mutex_trylock (__gthread_mutex_t *__mutex)
+{
+  if (__gthread_active_p ())
+    return __gthrw_(pthread_mutex_trylock) (__mutex);
+  else
+    return 0;
+}
+
+static inline int
+__gthread_mutex_unlock (__gthread_mutex_t *__mutex)
+{
+  if (__gthread_active_p ())
+    return __gthrw_(pthread_mutex_unlock) (__mutex);
+  else
+    return 0;
+}
+
+static inline int
+__gthread_recursive_mutex_init_function (__gthread_recursive_mutex_t *__mutex)
+{
+  if (__gthread_active_p ())
+    {
+      pthread_mutexattr_t __attr;
+      int __r;
+
+      __r = __gthrw_(pthread_mutexattr_create) (&__attr);
+      if (!__r)
+	__r = __gthrw_(pthread_mutexattr_setkind_np) (&__attr,
+						      MUTEX_RECURSIVE_NP);
+      if (!__r)
+	__r = __gthrw_(pthread_mutex_init) (__mutex, __attr);
+      if (!__r)
+	__r = __gthrw_(pthread_mutexattr_delete) (&__attr);
+      return __r;
+    }
+  return 0;
+}
+
+static inline int
+__gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *__mutex)
+{
+  return __gthread_mutex_lock (__mutex);
+}
+
+static inline int
+__gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *__mutex)
+{
+  return __gthread_mutex_trylock (__mutex);
+}
+
+static inline int
+__gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *__mutex)
+{
+  return __gthread_mutex_unlock (__mutex);
+}
+
+#endif /* _LIBOBJC */
+
+#endif
+#endif /* ! GCC_GTHR_DCE_H */
diff --git a/libgcc/config/rs6000/gthr-aix.h b/libgcc/config/rs6000/gthr-aix.h
new file mode 100644
index 00000000000..342f09187f0
--- /dev/null
+++ b/libgcc/config/rs6000/gthr-aix.h
@@ -0,0 +1,35 @@
+/* Threads compatibility routines for libgcc2 and libobjc.  */
+/* Compile this one with gcc.  */
+/* Copyright (C) 2000, 2009, 2011 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC 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, or (at your option) any later
+version.
+
+GCC 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.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+#ifndef GCC_GTHR_AIX_H
+#define GCC_GTHR_AIX_H
+
+#ifdef _THREAD_SAFE
+#include "config/gthr-posix.h"
+#else
+#include "gthr-single.h"
+#endif
+
+#endif /* GCC_GTHR_AIX_H */
diff --git a/libgcc/config/s390/gthr-tpf.h b/libgcc/config/s390/gthr-tpf.h
new file mode 100644
index 00000000000..fb23e91cfcd
--- /dev/null
+++ b/libgcc/config/s390/gthr-tpf.h
@@ -0,0 +1,229 @@
+/* Threads compatibility routines for libgcc2 and libobjc.
+   Compile this one with gcc.
+   Copyright (C) 2004, 2005, 2008, 2009 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC 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, or (at your option) any later
+version.
+
+GCC 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.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+/* TPF needs its own version of gthr-*.h because TPF always links to
+   the thread library.  However, for performance reasons we still do not
+   want to issue thread api calls unless a check is made to see that we
+   are running as a thread.  */
+
+#ifndef GCC_GTHR_TPF_H
+#define GCC_GTHR_TPF_H
+
+/* POSIX threads specific definitions.
+   Easy, since the interface is just one-to-one mapping.  */
+
+#define __GTHREADS 1
+
+/* Some implementations of <pthread.h> require this to be defined.  */
+#ifndef _REENTRANT
+#define _REENTRANT 1
+#endif
+
+#include <pthread.h>
+#include <unistd.h>
+
+typedef pthread_key_t __gthread_key_t;
+typedef pthread_once_t __gthread_once_t;
+typedef pthread_mutex_t __gthread_mutex_t;
+typedef pthread_mutex_t __gthread_recursive_mutex_t;
+
+#if defined(PTHREAD_RECURSIVE_MUTEX_INITIALIZER)
+#define __GTHREAD_RECURSIVE_MUTEX_INIT PTHREAD_RECURSIVE_MUTEX_INITIALIZER
+#elif defined(PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP)
+#define __GTHREAD_RECURSIVE_MUTEX_INIT PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP
+#endif
+
+#define __GTHREAD_MUTEX_INIT PTHREAD_MUTEX_INITIALIZER
+#define __GTHREAD_ONCE_INIT PTHREAD_ONCE_INIT
+#define __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION __gthread_recursive_mutex_init_function
+
+#define NOTATHREAD   00
+#define ECBBASEPTR (unsigned long int) *(unsigned int *)0x00000514u
+#define ECBPG2PTR  ECBBASEPTR + 0x1000
+#define CE2THRCPTR *((unsigned char *)(ECBPG2PTR + 16))
+#define __tpf_pthread_active() (CE2THRCPTR != NOTATHREAD)
+
+#if SUPPORTS_WEAK && GTHREAD_USE_WEAK
+# define __gthrw(name) \
+  static __typeof(name) __gthrw_ ## name __attribute__ ((__weakref__(#name)));
+# define __gthrw_(name) __gthrw_ ## name
+#else
+# define __gthrw(name)
+# define __gthrw_(name) name
+#endif
+
+__gthrw(pthread_once)
+__gthrw(pthread_key_create)
+__gthrw(pthread_key_delete)
+__gthrw(pthread_getspecific)
+__gthrw(pthread_setspecific)
+__gthrw(pthread_create)
+
+__gthrw(pthread_mutex_lock)
+__gthrw(pthread_mutex_trylock)
+__gthrw(pthread_mutex_unlock)
+__gthrw(pthread_mutexattr_init)
+__gthrw(pthread_mutexattr_settype)
+__gthrw(pthread_mutexattr_destroy)
+__gthrw(pthread_mutex_init)
+__gthrw(pthread_mutex_destroy)
+
+static inline int
+__gthread_active_p (void)
+{
+  return 1;
+}
+
+static inline int
+__gthread_once (__gthread_once_t *__once, void (*__func) (void))
+{
+  if (__tpf_pthread_active ())
+    return __gthrw_(pthread_once) (__once, __func);
+  else
+    return -1;
+}
+
+static inline int
+__gthread_key_create (__gthread_key_t *__key, void (*__dtor) (void *))
+{
+  if (__tpf_pthread_active ())
+    return __gthrw_(pthread_key_create) (__key, __dtor);
+  else
+    return -1;
+}
+
+static inline int
+__gthread_key_delete (__gthread_key_t __key)
+{
+  if (__tpf_pthread_active ())
+    return __gthrw_(pthread_key_delete) (__key);
+  else
+    return -1;
+}
+
+static inline void *
+__gthread_getspecific (__gthread_key_t __key)
+{
+  if (__tpf_pthread_active ())
+    return __gthrw_(pthread_getspecific) (__key);
+  else
+    return NULL;
+}
+
+static inline int
+__gthread_setspecific (__gthread_key_t __key, const void *__ptr)
+{
+  if (__tpf_pthread_active ())
+    return __gthrw_(pthread_setspecific) (__key, __ptr);
+  else
+    return -1;
+}
+
+static inline int
+__gthread_mutex_destroy (__gthread_mutex_t *__mutex)
+{
+  if (__tpf_pthread_active ())
+    return __gthrw_(pthread_mutex_destroy) (__mutex);
+  else
+    return 0;
+}
+
+static inline int
+__gthread_mutex_lock (__gthread_mutex_t *__mutex)
+{
+  if (__tpf_pthread_active ())
+    return __gthrw_(pthread_mutex_lock) (__mutex);
+  else
+    return 0;
+}
+
+static inline int
+__gthread_mutex_trylock (__gthread_mutex_t *__mutex)
+{
+  if (__tpf_pthread_active ())
+    return __gthrw_(pthread_mutex_trylock) (__mutex);
+  else
+    return 0;
+}
+
+static inline int
+__gthread_mutex_unlock (__gthread_mutex_t *__mutex)
+{
+  if (__tpf_pthread_active ())
+    return __gthrw_(pthread_mutex_unlock) (__mutex);
+  else
+    return 0;
+}
+
+static inline int
+__gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *__mutex)
+{
+  if (__tpf_pthread_active ())
+    return __gthread_mutex_lock (__mutex);
+  else
+    return 0;
+}
+
+static inline int
+__gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *__mutex)
+{
+  if (__tpf_pthread_active ())
+    return __gthread_mutex_trylock (__mutex);
+  else
+    return 0;
+}
+
+static inline int
+__gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *__mutex)
+{
+  if (__tpf_pthread_active ())
+    return __gthread_mutex_unlock (__mutex);
+  else
+    return 0;
+}
+
+static inline int
+__gthread_recursive_mutex_init_function (__gthread_recursive_mutex_t *__mutex)
+{
+  if (__tpf_pthread_active ())
+    {
+      pthread_mutexattr_t __attr;
+      int __r;
+
+      __r = __gthrw_(pthread_mutexattr_init) (&__attr);
+      if (!__r)
+	__r = __gthrw_(pthread_mutexattr_settype) (&__attr,
+						   PTHREAD_MUTEX_RECURSIVE);
+      if (!__r)
+	__r = __gthrw_(pthread_mutex_init) (__mutex, &__attr);
+      if (!__r)
+	__r = __gthrw_(pthread_mutexattr_destroy) (&__attr);
+      return __r;
+    }
+  return 0;
+}
+
+
+#endif /* ! GCC_GTHR_TPF_H */
diff --git a/libgcc/configure b/libgcc/configure
index 63b91b47a55..0d91645ed67 100644
--- a/libgcc/configure
+++ b/libgcc/configure
@@ -2273,7 +2273,7 @@ case $host_os in *\ *) host_os=`echo "$host_os" | sed 's/ /-/g'`;; esac
 
 
 
-  # FIXME: Do we need something for CFLAGS below?
+
 
 case "${host}" in
     # PIC is the default on some targets or must not be used.
@@ -2288,24 +2288,23 @@ case "${host}" in
     hppa*64*-*-hpux*)
 	# PIC is the default for 64-bit PA HP-UX.
 	;;
-    i3456786-*-cygwin* | i3456786-*-mingw* | x86_64-*-mingw*)
+    i[34567]86-*-cygwin* | i[34567]86-*-mingw* | x86_64-*-mingw*)
 	;;
-    i3456786-*-interix3*)
+    i[34567]86-*-interix3*)
 	# Interix 3.x gcc -fpic/-fPIC options generate broken code.
 	# Instead, we relocate shared libraries at runtime.
 	;;
-    i3456786-*-nto-qnx*)
+    i[34567]86-*-nto-qnx*)
 	# QNX uses GNU C++, but need to define -shared option too, otherwise
 	# it will coredump.
 	PICFLAG='-fPIC -shared'
 	;;
-    i3456786-pc-msdosdjgpp*)
+    i[34567]86-pc-msdosdjgpp*)
 	# DJGPP does not support shared libraries at all.
 	;;
     ia64*-*-hpux*)
 	# On IA64 HP-UX, PIC is the default but the pic flag
 	# sets the default TLS model and affects inlining.
-	# FIXME: Still in gcc 4.7?
 	PICFLAG=-fPIC
 	;;
     mips-sgi-irix6*)
@@ -2317,7 +2316,7 @@ case "${host}" in
 
     # Some targets support both -fPIC and -fpic, but prefer the latter.
     # FIXME: Why?
-    i3456786-*-* | x86_64-*-*)
+    i[34567]86-*-* | x86_64-*-*)
 	PICFLAG=-fpic
 	;;
     m68k-*-*)
@@ -2327,7 +2326,7 @@ case "${host}" in
 	PICFLAG=-fpic
 	;;
     # FIXME: Override -fPIC default in libgcc only?
-    sh-*-linux* | sh2346lbe*-*-linux*)
+    sh-*-linux* | sh[2346lbe]*-*-linux*)
 	PICFLAG=-fpic
 	;;
     # FIXME: Simplify to sh*-*-netbsd*?
@@ -2335,22 +2334,22 @@ case "${host}" in
       sh64-*-netbsd* | sh64l*-*-netbsd*)
 	PICFLAG=-fpic
 	;;
-    sparc*-*-*)
-	# FIXME: This could be done everywhere -fpic and -fPIC differ.
-	case "${CFLAGS}" in
-	    *-fpic*)
-		PICFLAG=-fpic
-		;;
-	    *)
-		PICFLAG=-fPIC
-		;;
-	esac ;;
     # Default to -fPIC unless specified otherwise.
     *)
 	PICFLAG=-fPIC
 	;;
 esac
 
+# If the user explicitly uses -fpic/-fPIC, keep that.
+case "${CFLAGS}" in
+    *-fpic*)
+	PICFLAG=-fpic
+	;;
+    *-fPIC*)
+	PICFLAG=-fPIC
+	;;
+esac
+
 
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for --enable-version-specific-runtime-libs" >&5
@@ -4797,6 +4796,20 @@ tm_file="${tm_file_}"
 
 
 
+# Map from thread model to thread header.
+case $target_thread_file in
+    aix)	thread_header=config/rs6000/gthr-aix.h ;;
+    dce)	thread_header=config/pa/gthr-dce.h ;;
+    lynx)	thread_header=config/gthr-lynx.h ;;
+    mipssde)	thread_header=config/mips/gthr-mipssde.h ;;
+    posix)	thread_header=config/gthr-posix.h ;;
+    rtems)	thread_header=config/gthr-rtems.h ;;
+    single)	thread_header=gthr-single.h ;;
+    tpf)	thread_header=config/s390/gthr-tpf.h ;;
+    vxworks)	thread_header=config/gthr-vxworks.h ;;
+    win32)	thread_header=config/i386/gthr-win32.h ;;
+esac
+
 # Substitute configuration variables
 
 
@@ -4809,6 +4822,8 @@ ac_config_links="$ac_config_links md-unwind-support.h:config/$md_unwind_header"
 
 ac_config_links="$ac_config_links sfp-machine.h:config/$sfp_machine_header"
 
+ac_config_links="$ac_config_links gthr-default.h:$thread_header"
+
 
 # We need multilib support.
 ac_config_files="$ac_config_files Makefile"
@@ -5538,6 +5553,7 @@ do
     "unwind.h") CONFIG_LINKS="$CONFIG_LINKS unwind.h:$unwind_header" ;;
     "md-unwind-support.h") CONFIG_LINKS="$CONFIG_LINKS md-unwind-support.h:config/$md_unwind_header" ;;
     "sfp-machine.h") CONFIG_LINKS="$CONFIG_LINKS sfp-machine.h:config/$sfp_machine_header" ;;
+    "gthr-default.h") CONFIG_LINKS="$CONFIG_LINKS gthr-default.h:$thread_header" ;;
     "Makefile") CONFIG_FILES="$CONFIG_FILES Makefile" ;;
     "default") CONFIG_COMMANDS="$CONFIG_COMMANDS default" ;;
 
diff --git a/libgcc/configure.ac b/libgcc/configure.ac
index 303a95ff54b..a505257ac23 100644
--- a/libgcc/configure.ac
+++ b/libgcc/configure.ac
@@ -364,6 +364,20 @@ tm_file="${tm_file_}"
 AC_SUBST(tm_file)
 AC_SUBST(tm_defines)
 
+# Map from thread model to thread header.
+case $target_thread_file in
+    aix)	thread_header=config/rs6000/gthr-aix.h ;;
+    dce)	thread_header=config/pa/gthr-dce.h ;;
+    lynx)	thread_header=config/gthr-lynx.h ;;
+    mipssde)	thread_header=config/mips/gthr-mipssde.h ;;
+    posix)	thread_header=config/gthr-posix.h ;;
+    rtems)	thread_header=config/gthr-rtems.h ;;
+    single)	thread_header=gthr-single.h ;;
+    tpf)	thread_header=config/s390/gthr-tpf.h ;;
+    vxworks)	thread_header=config/gthr-vxworks.h ;;
+    win32)	thread_header=config/i386/gthr-win32.h ;;
+esac
+
 # Substitute configuration variables
 AC_SUBST(cpu_type)
 AC_SUBST(extra_parts)
@@ -372,6 +386,7 @@ AC_CONFIG_LINKS([enable-execute-stack.c:$enable_execute_stack])
 AC_CONFIG_LINKS([unwind.h:$unwind_header])
 AC_CONFIG_LINKS([md-unwind-support.h:config/$md_unwind_header])
 AC_CONFIG_LINKS([sfp-machine.h:config/$sfp_machine_header])
+AC_CONFIG_LINKS([gthr-default.h:$thread_header])
 
 # We need multilib support.
 AC_CONFIG_FILES([Makefile])
diff --git a/libgcc/gthr-single.h b/libgcc/gthr-single.h
new file mode 100644
index 00000000000..357528ad1f1
--- /dev/null
+++ b/libgcc/gthr-single.h
@@ -0,0 +1,292 @@
+/* Threads compatibility routines for libgcc2 and libobjc.  */
+/* Compile this one with gcc.  */
+/* Copyright (C) 1997, 1999, 2000, 2004, 2008, 2009
+   Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC 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, or (at your option) any later
+version.
+
+GCC 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.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+#ifndef GCC_GTHR_SINGLE_H
+#define GCC_GTHR_SINGLE_H
+
+/* Just provide compatibility for mutex handling.  */
+
+typedef int __gthread_key_t;
+typedef int __gthread_once_t;
+typedef int __gthread_mutex_t;
+typedef int __gthread_recursive_mutex_t;
+
+#define __GTHREAD_ONCE_INIT 0
+#define __GTHREAD_MUTEX_INIT 0
+#define __GTHREAD_RECURSIVE_MUTEX_INIT 0
+
+#define UNUSED __attribute__((unused))
+
+#ifdef _LIBOBJC
+
+/* Thread local storage for a single thread */
+static void *thread_local_storage = NULL;
+
+/* Backend initialization functions */
+
+/* Initialize the threads subsystem.  */
+static inline int
+__gthread_objc_init_thread_system (void)
+{
+  /* No thread support available */
+  return -1;
+}
+
+/* Close the threads subsystem.  */
+static inline int
+__gthread_objc_close_thread_system (void)
+{
+  /* No thread support available */
+  return -1;
+}
+
+/* Backend thread functions */
+
+/* Create a new thread of execution.  */
+static inline objc_thread_t
+__gthread_objc_thread_detach (void (* func)(void *), void * arg UNUSED)
+{
+  /* No thread support available */
+  return NULL;
+}
+
+/* Set the current thread's priority.  */
+static inline int
+__gthread_objc_thread_set_priority (int priority UNUSED)
+{
+  /* No thread support available */
+  return -1;
+}
+
+/* Return the current thread's priority.  */
+static inline int
+__gthread_objc_thread_get_priority (void)
+{
+  return OBJC_THREAD_INTERACTIVE_PRIORITY;
+}
+
+/* Yield our process time to another thread.  */
+static inline void
+__gthread_objc_thread_yield (void)
+{
+  return;
+}
+
+/* Terminate the current thread.  */
+static inline int
+__gthread_objc_thread_exit (void)
+{
+  /* No thread support available */
+  /* Should we really exit the program */
+  /* exit (&__objc_thread_exit_status); */
+  return -1;
+}
+
+/* Returns an integer value which uniquely describes a thread.  */
+static inline objc_thread_t
+__gthread_objc_thread_id (void)
+{
+  /* No thread support, use 1.  */
+  return (objc_thread_t) 1;
+}
+
+/* Sets the thread's local storage pointer.  */
+static inline int
+__gthread_objc_thread_set_data (void *value)
+{
+  thread_local_storage = value;
+  return 0;
+}
+
+/* Returns the thread's local storage pointer.  */
+static inline void *
+__gthread_objc_thread_get_data (void)
+{
+  return thread_local_storage;
+}
+
+/* Backend mutex functions */
+
+/* Allocate a mutex.  */
+static inline int
+__gthread_objc_mutex_allocate (objc_mutex_t mutex UNUSED)
+{
+  return 0;
+}
+
+/* Deallocate a mutex.  */
+static inline int
+__gthread_objc_mutex_deallocate (objc_mutex_t mutex UNUSED)
+{
+  return 0;
+}
+
+/* Grab a lock on a mutex.  */
+static inline int
+__gthread_objc_mutex_lock (objc_mutex_t mutex UNUSED)
+{
+  /* There can only be one thread, so we always get the lock */
+  return 0;
+}
+
+/* Try to grab a lock on a mutex.  */
+static inline int
+__gthread_objc_mutex_trylock (objc_mutex_t mutex UNUSED)
+{
+  /* There can only be one thread, so we always get the lock */
+  return 0;
+}
+
+/* Unlock the mutex */
+static inline int
+__gthread_objc_mutex_unlock (objc_mutex_t mutex UNUSED)
+{
+  return 0;
+}
+
+/* Backend condition mutex functions */
+
+/* Allocate a condition.  */
+static inline int
+__gthread_objc_condition_allocate (objc_condition_t condition UNUSED)
+{
+  return 0;
+}
+
+/* Deallocate a condition.  */
+static inline int
+__gthread_objc_condition_deallocate (objc_condition_t condition UNUSED)
+{
+  return 0;
+}
+
+/* Wait on the condition */
+static inline int
+__gthread_objc_condition_wait (objc_condition_t condition UNUSED,
+			       objc_mutex_t mutex UNUSED)
+{
+  return 0;
+}
+
+/* Wake up all threads waiting on this condition.  */
+static inline int
+__gthread_objc_condition_broadcast (objc_condition_t condition UNUSED)
+{
+  return 0;
+}
+
+/* Wake up one thread waiting on this condition.  */
+static inline int
+__gthread_objc_condition_signal (objc_condition_t condition UNUSED)
+{
+  return 0;
+}
+
+#else /* _LIBOBJC */
+
+static inline int
+__gthread_active_p (void)
+{
+  return 0;
+}
+
+static inline int
+__gthread_once (__gthread_once_t *__once UNUSED, void (*__func) (void) UNUSED)
+{
+  return 0;
+}
+
+static inline int UNUSED
+__gthread_key_create (__gthread_key_t *__key UNUSED, void (*__func) (void *) UNUSED)
+{
+  return 0;
+}
+
+static int UNUSED
+__gthread_key_delete (__gthread_key_t __key UNUSED)
+{
+  return 0;
+}
+
+static inline void *
+__gthread_getspecific (__gthread_key_t __key UNUSED)
+{
+  return 0;
+}
+
+static inline int
+__gthread_setspecific (__gthread_key_t __key UNUSED, const void *__v UNUSED)
+{
+  return 0;
+}
+
+static inline int
+__gthread_mutex_destroy (__gthread_mutex_t *__mutex UNUSED)
+{
+  return 0;
+}
+
+static inline int
+__gthread_mutex_lock (__gthread_mutex_t *__mutex UNUSED)
+{
+  return 0;
+}
+
+static inline int
+__gthread_mutex_trylock (__gthread_mutex_t *__mutex UNUSED)
+{
+  return 0;
+}
+
+static inline int
+__gthread_mutex_unlock (__gthread_mutex_t *__mutex UNUSED)
+{
+  return 0;
+}
+
+static inline int
+__gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *__mutex)
+{
+  return __gthread_mutex_lock (__mutex);
+}
+
+static inline int
+__gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *__mutex)
+{
+  return __gthread_mutex_trylock (__mutex);
+}
+
+static inline int
+__gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *__mutex)
+{
+  return __gthread_mutex_unlock (__mutex);
+}
+
+#endif /* _LIBOBJC */
+
+#undef UNUSED
+
+#endif /* ! GCC_GTHR_SINGLE_H */
diff --git a/libgcc/gthr.h b/libgcc/gthr.h
new file mode 100644
index 00000000000..607c26eb563
--- /dev/null
+++ b/libgcc/gthr.h
@@ -0,0 +1,148 @@
+/* Threads compatibility routines for libgcc2.  */
+/* Compile this one with gcc.  */
+/* Copyright (C) 1997, 1998, 2004, 2008, 2009, 2011
+   Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC 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, or (at your option) any later
+version.
+
+GCC 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.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+#ifndef GCC_GTHR_H
+#define GCC_GTHR_H
+
+#ifndef HIDE_EXPORTS
+#pragma GCC visibility push(default)
+#endif
+
+/* If this file is compiled with threads support, it must
+       #define __GTHREADS 1
+   to indicate that threads support is present.  Also it has define
+   function
+     int __gthread_active_p ()
+   that returns 1 if thread system is active, 0 if not.
+
+   The threads interface must define the following types:
+     __gthread_key_t
+     __gthread_once_t
+     __gthread_mutex_t
+     __gthread_recursive_mutex_t
+
+   The threads interface must define the following macros:
+
+     __GTHREAD_ONCE_INIT
+     		to initialize __gthread_once_t
+     __GTHREAD_MUTEX_INIT
+     		to initialize __gthread_mutex_t to get a fast
+		non-recursive mutex.
+     __GTHREAD_MUTEX_INIT_FUNCTION
+     		some systems can't initialize a mutex without a
+		function call.  On such systems, define this to a
+		function which looks like this:
+		  void __GTHREAD_MUTEX_INIT_FUNCTION (__gthread_mutex_t *)
+		Don't define __GTHREAD_MUTEX_INIT in this case
+     __GTHREAD_RECURSIVE_MUTEX_INIT
+     __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION
+     		as above, but for a recursive mutex.
+
+   The threads interface must define the following static functions:
+
+     int __gthread_once (__gthread_once_t *once, void (*func) ())
+
+     int __gthread_key_create (__gthread_key_t *keyp, void (*dtor) (void *))
+     int __gthread_key_delete (__gthread_key_t key)
+
+     void *__gthread_getspecific (__gthread_key_t key)
+     int __gthread_setspecific (__gthread_key_t key, const void *ptr)
+
+     int __gthread_mutex_destroy (__gthread_mutex_t *mutex);
+
+     int __gthread_mutex_lock (__gthread_mutex_t *mutex);
+     int __gthread_mutex_trylock (__gthread_mutex_t *mutex);
+     int __gthread_mutex_unlock (__gthread_mutex_t *mutex);
+
+     int __gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *mutex);
+     int __gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *mutex);
+     int __gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *mutex);
+
+   The following are supported in POSIX threads only. They are required to
+   fix a deadlock in static initialization inside libsupc++. The header file
+   gthr-posix.h defines a symbol __GTHREAD_HAS_COND to signify that these extra
+   features are supported.
+
+   Types:
+     __gthread_cond_t
+
+   Macros:
+     __GTHREAD_COND_INIT
+     __GTHREAD_COND_INIT_FUNCTION
+
+   Interface:
+     int __gthread_cond_broadcast (__gthread_cond_t *cond);
+     int __gthread_cond_wait (__gthread_cond_t *cond, __gthread_mutex_t *mutex);
+     int __gthread_cond_wait_recursive (__gthread_cond_t *cond,
+					__gthread_recursive_mutex_t *mutex);
+
+   All functions returning int should return zero on success or the error
+   number.  If the operation is not supported, -1 is returned.
+
+   If the following are also defined, you should
+     #define __GTHREADS_CXX0X 1
+   to enable the c++0x thread library.
+
+   Types:
+     __gthread_t
+     __gthread_time_t
+
+   Interface:
+     int __gthread_create (__gthread_t *thread, void *(*func) (void*),
+                           void *args);
+     int __gthread_join (__gthread_t thread, void **value_ptr);
+     int __gthread_detach (__gthread_t thread);
+     int __gthread_equal (__gthread_t t1, __gthread_t t2);
+     __gthread_t __gthread_self (void);
+     int __gthread_yield (void);
+
+     int __gthread_mutex_timedlock (__gthread_mutex_t *m,
+                                    const __gthread_time_t *abs_timeout);
+     int __gthread_recursive_mutex_timedlock (__gthread_recursive_mutex_t *m,
+                                          const __gthread_time_t *abs_time);
+
+     int __gthread_cond_signal (__gthread_cond_t *cond);
+     int __gthread_cond_timedwait (__gthread_cond_t *cond,
+                                   __gthread_mutex_t *mutex,
+                                   const __gthread_time_t *abs_timeout);
+     int __gthread_cond_timedwait_recursive (__gthread_cond_t *cond,
+                                             __gthread_recursive_mutex_t *mutex,
+                                             const __gthread_time_t *abs_time)
+
+*/
+
+#if SUPPORTS_WEAK
+#ifndef GTHREAD_USE_WEAK
+#define GTHREAD_USE_WEAK 1
+#endif
+#endif
+#include "gthr-default.h"
+
+#ifndef HIDE_EXPORTS
+#pragma GCC visibility pop
+#endif
+
+#endif /* ! GCC_GTHR_H */