* configure.in (enable-newlib-global-atexit): New option.

* configure: Regenerated.
	* newlib.hin (_REENT_GLOBAL_ATEXIT): Place-holder.
	* README (enable-newlib-global-atexit): Description for
	new option.

newlib/ChangeLog

@@ -1,3 +1,11 @@
+2013-10-18  Joey Ye  <joey.ye@arm.com>
+
+	* configure.in (enable-newlib-global-atexit): New option.
+	* configure: Regenerated.
+	* newlib.hin (_REENT_GLOBAL_ATEXIT): Place-holder.
+	* README (enable-newlib-global-atexit): Description for
+	new option.
+
 2013-10-18  Sebastian Huber <sebastian.huber@embedded-brains.de>
 
 	* libc/include/sys/unistd.h (MAXPATHLEN): Delete.

newlib/README

@@ -288,6 +288,12 @@ One feature can be enabled by specifying `--enable-FEATURE=yes' or
      Disable dynamic allocation of atexit entries.
      Most hosts and targets have it enabled in configure.host.
 
+`--enable-newlib-global-atexit'
+     Enable atexit data structure as global variable.  By doing so it is
+     move out of _reent structure, and can be garbage collected if atexit
+     is not referenced.
+     Disabled by default.
+
 `--enable-newlib-reent-small'
      Enable small reentrant struct support.
      Disabled by default.

newlib/configure

@@ -788,6 +788,7 @@ enable_newlib_iconv_from_encodings
 enable_newlib_iconv_to_encodings
 enable_newlib_iconv_external_ccs
 enable_newlib_atexit_dynamic_alloc
+enable_newlib_global_atexit
 enable_newlib_reent_small
 enable_newlib_fvwrite_in_streamio
 enable_newlib_fseek_optimization
@@ -1457,6 +1458,7 @@ Optional Features:
   --enable-newlib-iconv-to-encodings   enable specific comma-separated list of \"to\" iconv encodings to be built-in
   --enable-newlib-iconv-external-ccs     enable capabilities to load external CCS files for iconv
   --disable-newlib-atexit-dynamic-alloc    disable dynamic allocation of atexit entries
+  --enable-newlib-global-atexit	enable atexit data structure as global
   --enable-newlib-reent-small   enable small reentrant struct support
   --disable-newlib-fvwrite-in-streamio    disable iov in streamio
   --disable-newlib-fseek-optimization    disable fseek optimization
@@ -2352,6 +2354,19 @@ else
   newlib_atexit_dynamic_alloc=${newlib_atexit_dynamic_alloc}
 fi
 
+# Check whether --enable-newlib-global-atexit was given.
+if test "${enable_newlib_global_atexit+set}" = set; then :
+  enableval=$enable_newlib_global_atexit; if test "${newlib_global_atexit+set}" != set; then
+  case "${enableval}" in
+    yes) newlib_global_atexit=yes ;;
+    no)  newlib_global_atexit=no  ;;
+    *)   as_fn_error $? "bad value ${enableval} for newlib-global-atexit option" "$LINENO" 5 ;;
+  esac
+ fi
+else
+  newlib_global_atexit=no
+fi
+
 # Check whether --enable-newlib-reent-small was given.
 if test "${enable_newlib_reent_small+set}" = set; then :
   enableval=$enable_newlib_reent_small; case "${enableval}" in
@@ -12321,6 +12336,13 @@ _ACEOF
 
 fi
 
+if test "${newlib_global_atexit}" = "yes"; then
+cat >>confdefs.h <<_ACEOF
+#define _REENT_GLOBAL_ATEXIT 1
+_ACEOF
+
+fi
+
 if test "${newlib_fvwrite_in_streamio}" = "yes"; then
 cat >>confdefs.h <<_ACEOF
 #define _FVWRITE_IN_STREAMIO 1

newlib/configure.in

@@ -115,6 +115,19 @@ AC_ARG_ENABLE(newlib-atexit-dynamic-alloc,
   esac
  fi], [newlib_atexit_dynamic_alloc=${newlib_atexit_dynamic_alloc}])dnl
 
+dnl Support --enable-newlib-global-atexit
+dnl Enable atexit data structure as global variables to save memory usage in
+dnl _reent.
+AC_ARG_ENABLE(newlib-global-atexit,
+[  --enable-newlib-global-atexit	enable atexit data structure as global],
+[if test "${newlib_global_atexit+set}" != set; then
+  case "${enableval}" in
+    yes) newlib_global_atexit=yes ;;
+    no)  newlib_global_atexit=no  ;;
+    *)   AC_MSG_ERROR(bad value ${enableval} for newlib-global-atexit option) ;;
+  esac
+ fi], [newlib_global_atexit=no])dnl
+
 dnl Support --enable-newlib-reent-small
 AC_ARG_ENABLE(newlib-reent-small,
 [  --enable-newlib-reent-small   enable small reentrant struct support],
@@ -383,6 +396,10 @@ if test "${newlib_atexit_dynamic_alloc}" = "yes"; then
 AC_DEFINE_UNQUOTED(_ATEXIT_DYNAMIC_ALLOC)
 fi
 
+if test "${newlib_global_atexit}" = "yes"; then
+AC_DEFINE_UNQUOTED(_REENT_GLOBAL_ATEXIT)
+fi
+
 if test "${newlib_fvwrite_in_streamio}" = "yes"; then
 AC_DEFINE_UNQUOTED(_FVWRITE_IN_STREAMIO)
 fi

newlib/newlib.hin

@@ -73,6 +73,9 @@
 /* Define if lite version of exit supported.  */
 #undef _LITE_EXIT
 
+/* Define if declare atexit data as global.  */
+#undef _REENT_GLOBAL_ATEXIT
+
 /*
  * Iconv encodings enabled ("to" direction)
  */