2013-07-02 Joey Ye <joey.ye@arm.com>

Lite exit support.
        * README: Add information about lite-exit.
        * acconfig.h (_LITE_EXIT): New macro.
        * configure.in (enable-lite-exit): New option.
        (_LITE_EXIT): Define new macro.
        * configure: Regenerated.
        * newlib.hin (_LITE_EXIT): New macro.
        * libc/stdlib/__atexit.c [_LITE_EXIT]: Add dummy explicit
        reference to __call_exitprocs.
        * libc/stdlib/cxa_atexit.c [_LITE_EXIT]: Make __register_exitproc a
        weak reference.
        * libc/stdlib/exit.c (exit)[_LITE_EXIT]: Remove TWS and weakly reference
        __call_exitprocs.

newlib/configure

@@ -794,6 +794,7 @@ enable_newlib_fseek_optimization
 enable_newlib_wide_orient
 enable_newlib_nano_malloc
 enable_newlib_unbuf_stream_opt
+enable_lite_exit
 enable_multilib
 enable_target_optspace
 enable_malloc_debugging
@@ -1462,6 +1463,7 @@ Optional Features:
   --disable-newlib-wide-orient    Turn off wide orientation in streamio
   --enable-newlib-nano-malloc    use small-footprint nano-malloc implementation
   --disable-newlib-unbuf-stream-opt    disable unbuffered stream optimization in streamio
+  --enable-lite-exit	enable light weight exit
   --enable-multilib         build many library versions (default)
   --enable-target-optspace  optimize for space
   --enable-malloc-debugging indicate malloc debugging requested
@@ -2425,6 +2427,19 @@ else
   newlib_unbuf_stream_opt=yes
 fi
 
+# Check whether --enable-lite-exit was given.
+if test "${enable_lite_exit+set}" = set; then :
+  enableval=$enable_lite_exit; if test "${lite_exit+set}" != set; then
+  case "${enableval}" in
+    yes) lite_exit=yes ;;
+    no)  lite_exit=no  ;;
+    *)   as_fn_error $? "bad value ${enableval} for lite-exit option" "$LINENO" 5 ;;
+  esac
+ fi
+else
+  lite_exit=no
+fi
+
 
 # Make sure we can run config.sub.
 $SHELL "$ac_aux_dir/config.sub" sun4 >/dev/null 2>&1 ||
@@ -11725,7 +11740,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 11698 "configure"
+#line 11743 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -11831,7 +11846,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 11804 "configure"
+#line 11849 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -12341,6 +12356,13 @@ _ACEOF
 
 fi
 
+if test "${lite_exit}" = "yes"; then
+cat >>confdefs.h <<_ACEOF
+#define _LITE_EXIT 1
+_ACEOF
+
+fi
+
 
 if test "x${iconv_encodings}" != "x" \
    || test "x${iconv_to_encodings}" != "x" \