config.gcc: Add aarch64-*-rtems*.

2016-02-26  Joel Sherrill <joel@rtems.org>

	* config.gcc: Add aarch64-*-rtems*.
	* gcc/config/aarch64/rtems.h: New file.

From-SVN: r233760

gcc/ChangeLog

+2016-02-26  Joel Sherrill <joel@rtems.org>
+
+	* config.gcc: Add aarch64-*-rtems*.
+	* gcc/config/aarch64/rtems.h: New file.
+
 2016-02-26  Segher Boessenkool  <segher@kernel.crashing.org>
 
 	PR target/69946

gcc/config.gcc

@@ -906,11 +906,18 @@ case ${target} in
 esac
 
 case ${target} in
-aarch64*-*-elf)
+aarch64*-*-elf | aarch64*-*-rtems*)
 	tm_file="${tm_file} dbxelf.h elfos.h newlib-stdint.h"
 	tm_file="${tm_file} aarch64/aarch64-elf.h aarch64/aarch64-elf-raw.h"
 	tmake_file="${tmake_file} aarch64/t-aarch64"
-	use_gcc_stdint=wrap
+	case $target in
+	aarch64-*-elf*)
+		use_gcc_stdint=wrap
+		;;
+	aarch64-*-rtems*)
+	  	tm_file="${tm_file} rtems.h aarch64/rtems.h"
+		;;
+	esac
 	case $target in
 	aarch64_be-*)
 		tm_defines="${tm_defines} TARGET_BIG_ENDIAN_DEFAULT=1"

gcc/config/aarch64/rtems.h

+/* Definitions for RTEMS based AARCH64 system.
+   Copyright (C) 2016 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.
+ 
+   You should have received a copy of the GNU General Public License
+   along with GCC; see the file COPYING3.  If not see
+   <http://www.gnu.org/licenses/>.  */
+
+#define HAS_INIT_SECTION
+
+#undef TARGET_OS_CPP_BUILTINS
+#define TARGET_OS_CPP_BUILTINS()		\
+    do {					\
+	builtin_define ("__rtems__");		\
+	builtin_define ("__USE_INIT_FINI__");	\
+	builtin_assert ("system=rtems");	\
+    } while (0)