config.gcc (*-*-rtems*): Use __cxa_atexit by default.

2013-07-31  Sebastian Huber  <sebastian.huber@embedded-brains.de>

	* config.gcc (*-*-rtems*): Use __cxa_atexit by default.
	* config/rs6000/rtems.h (TARGET_LIBGCC_SDATA_SECTION): Define.

From-SVN: r201370

gcc/ChangeLog

+2013-07-31  Sebastian Huber  <sebastian.huber@embedded-brains.de>
+
+	* config.gcc (*-*-rtems*): Use __cxa_atexit by default.
+	* config/rs6000/rtems.h (TARGET_LIBGCC_SDATA_SECTION): Define.
+
 2013-07-31  Jan-Benedict Glaw  <jbglaw@lug-owl.de>
 
 	* gen-pass-instances.awk: Fix offset of substr().

gcc/config.gcc

@@ -760,6 +760,7 @@ case ${target} in
     yes) thread_file='rtems' ;;
   esac
   extra_options="${extra_options} rtems.opt"
+  default_use_cxa_atexit=yes
   use_gcc_stdint=wrap
   ;;
 *-*-uclinux*)

gcc/config/rs6000/rtems.h

@@ -34,6 +34,9 @@
     }                                     \
   while (0)
 
+#undef TARGET_LIBGCC_SDATA_SECTION
+#define TARGET_LIBGCC_SDATA_SECTION ".sdata"
+
 #undef CPP_OS_DEFAULT_SPEC
 #define CPP_OS_DEFAULT_SPEC "%(cpp_os_rtems)"