gcc: Switch GCC to the posix thread model.

Change from the RTEMS thread model to the POSIX model. Do not enable
the weak support as it fails to link in the posix parts from the
RTEMS library. No weak support requires libstdc++'s makefile be
updated to handle RTEMS.

tools/4.11/gcc/gcc-rtems-thread-model-posix-1.diff

@@ -0,0 +1,101 @@
+diff --git a/gcc/config.gcc b/gcc/config.gcc
+index ef37e61..6e03865 100644
+--- a/gcc/config.gcc
++++ b/gcc/config.gcc
+@@ -763,7 +763,7 @@ case ${target} in
+   ;;
+ *-*-rtems*)
+   case ${enable_threads} in
+-    yes) thread_file='rtems' ;;
++    yes) thread_file='posix' ;;
+   esac
+   extra_options="${extra_options} rtems.opt"
+   default_use_cxa_atexit=yes
+diff --git a/libgcc/config/t-rtems b/libgcc/config/t-rtems
+index 85f1da9..11e0c64 100644
+--- a/libgcc/config/t-rtems
++++ b/libgcc/config/t-rtems
+@@ -1,4 +1,4 @@
+ # If we are building next to newlib, this will let us find the RTEMS
+ # limits.h when building libgcc2.  Otherwise, newlib must be installed
+ # first.
+-LIBGCC2_INCLUDES = -I$(srcdir)/../newlib/libc/sys/rtems/include
++LIBGCC2_INCLUDES = -I$(srcdir)/../newlib/libc/sys/rtems/include -I$(srcdir)/../newlib/libc/sys/rtems
+diff --git a/libgcc/gthr-posix.h b/libgcc/gthr-posix.h
+index f0d8cd7..653a7fc 100644
+--- a/libgcc/gthr-posix.h
++++ b/libgcc/gthr-posix.h
+@@ -110,7 +110,9 @@ __gthrw(pthread_detach)
+ #ifndef __BIONIC__
+ __gthrw(pthread_cancel)
+ #endif
++#ifndef __rtems__
+ __gthrw(sched_yield)
++#endif
+ 
+ __gthrw(pthread_mutex_lock)
+ __gthrw(pthread_mutex_trylock)
+@@ -447,8 +449,10 @@ __gthread_objc_thread_get_priority (void)
+ static inline void
+ __gthread_objc_thread_yield (void)
+ {
++#ifndef __rtems__
+   if (__gthread_active_p ())
+     __gthrw_(sched_yield) ();
++#endif
+ }
+ 
+ /* Terminate the current thread.  */
+@@ -689,7 +693,11 @@ __gthread_self (void)
+ static inline int
+ __gthread_yield (void)
+ {
++#ifndef __rtems__
+   return __gthrw_(sched_yield) ();
++#else
++  return 0;
++#endif
+ }
+ 
+ static inline int
+diff --git a/libgcc/gthr.h b/libgcc/gthr.h
+index 0edb583..672f69d 100644
+--- a/libgcc/gthr.h
++++ b/libgcc/gthr.h
+@@ -135,8 +135,10 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+ #if SUPPORTS_WEAK
+ /* The pe-coff weak support isn't fully compatible to ELF's weak.
+    For static libraries it might would work, but as we need to deal
+-   with shared versions too, we disable it for mingw-targets.  */
+-#ifdef __MINGW32__
++   with shared versions too, we disable it for mingw-targets.
++
++   RTEMS is always threaded so disable weak support.  */
++#if defined(__MINGW32__) || defined(__rtems__)
+ #undef GTHREAD_USE_WEAK
+ #define GTHREAD_USE_WEAK 0
+ #endif
+diff --git a/libstdc++-v3/include/Makefile.am b/libstdc++-v3/include/Makefile.am
+index 5971af3..b8f2842 100644
+--- a/libstdc++-v3/include/Makefile.am
++++ b/libstdc++-v3/include/Makefile.am
+@@ -1139,6 +1139,7 @@ ${host_builddir}/gthr.h: ${toplevel_srcdir}/libgcc/gthr.h stamp-${host_alias}
+ 	    -e '/^#/s/\(${uppercase}${uppercase}*\)/_GLIBCXX_\1/g' \
+ 	    -e 's/_GLIBCXX_SUPPORTS_WEAK/__GXX_WEAK__/g' \
+ 	    -e 's/_GLIBCXX___MINGW32_GLIBCXX___/__MINGW32__/g' \
++	    -e 's/_GLIBCXX___rtems_GLIBCXX___/__rtems__/g' \
+ 	    -e 's,^#include "\(.*\)",#include <bits/\1>,g' \
+ 	    < $< > $@
+ 
+diff --git a/libstdc++-v3/include/Makefile.in b/libstdc++-v3/include/Makefile.in
+index aa8ef43..1536a7f 100644
+--- a/libstdc++-v3/include/Makefile.in
++++ b/libstdc++-v3/include/Makefile.in
+@@ -1545,6 +1545,7 @@ ${host_builddir}/gthr.h: ${toplevel_srcdir}/libgcc/gthr.h stamp-${host_alias}
+ 	    -e '/^#/s/\(${uppercase}${uppercase}*\)/_GLIBCXX_\1/g' \
+ 	    -e 's/_GLIBCXX_SUPPORTS_WEAK/__GXX_WEAK__/g' \
+ 	    -e 's/_GLIBCXX___MINGW32_GLIBCXX___/__MINGW32__/g' \
++	    -e 's/_GLIBCXX___rtems_GLIBCXX___/__rtems__/g' \
+ 	    -e 's,^#include "\(.*\)",#include <bits/\1>,g' \
+ 	    < $< > $@
+