[PATCH] RTEMS/EPIPHANY: Add RTEMS support

[Sebastian Huber <sebastian dot huber at embedded-brains dot de>]

gcc/
	config.gcc (epiphany-*-elf*): Add (epiphany-*-rtems*)
	configuration.
	config/epiphany/rtems.h: New file.

libgcc/
	config.host (epiphany-*-elf*): Add (epiphany-*-rtems*)
	configuration.
---
 gcc/config.gcc              | 16 ++++++++++++----
 gcc/config/epiphany/rtems.h | 28 ++++++++++++++++++++++++++++
 libgcc/config.host          |  4 ++--
 3 files changed, 42 insertions(+), 6 deletions(-)
 create mode 100644 gcc/config/epiphany/rtems.h

diff --git a/gcc/config.gcc b/gcc/config.gcc
index f19a469d101..d4970a2b7af 100644
--- a/gcc/config.gcc
+++ b/gcc/config.gcc
@@ -1269,11 +1269,19 @@ crisv32-*-linux* | cris-*-linux*)
 		;;
 	esac
 	;;
-epiphany-*-elf )
-	tm_file="dbxelf.h elfos.h newlib-stdint.h ${tm_file}"
-	tmake_file="epiphany/t-epiphany"
+epiphany-*-elf | epiphany-*-rtems*)
+	tm_file="${tm_file} dbxelf.h elfos.h"
+	tmake_file="${tmake_file} epiphany/t-epiphany"
+	case ${target} in
+	epiphany*-*-rtems*)
+	  tm_file="${tm_file} rtems.h epiphany/rtems.h newlib-stdint.h"
+	  ;;
+	*)
+	  tm_file="${tm_file} newlib-stdint.h"
+	  ;;
+	esac
 	extra_options="${extra_options} fused-madd.opt"
-	extra_objs="$extra_objs mode-switch-use.o resolve-sw-modes.o"
+	extra_objs="${extra_objs} mode-switch-use.o resolve-sw-modes.o"
 	tm_defines="${tm_defines} EPIPHANY_STACK_OFFSET=${with_stack_offset:-8}"
 	extra_headers="epiphany_intrinsics.h"
 	;;
diff --git a/gcc/config/epiphany/rtems.h b/gcc/config/epiphany/rtems.h
new file mode 100644
index 00000000000..a9971f8c0b6
--- /dev/null
+++ b/gcc/config/epiphany/rtems.h
@@ -0,0 +1,28 @@
+/* Definitions for RTEMS based EPIPHANY systems.
+   Copyright (C) 2018 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)
diff --git a/libgcc/config.host b/libgcc/config.host
index 4c10aa0307c..96d55a4aaa8 100644
--- a/libgcc/config.host
+++ b/libgcc/config.host
@@ -507,8 +507,8 @@ cris-*-elf)
 cris-*-linux* | crisv32-*-linux*)
 	tmake_file="$tmake_file cris/t-cris t-softfp-sfdf t-softfp cris/t-linux"
 	;;
-epiphany-*-elf*)
-	tmake_file="epiphany/t-epiphany t-fdpbit epiphany/t-custom-eqsf"
+epiphany-*-elf* | epiphany-*-rtems*)
+	tmake_file="$tmake_file epiphany/t-epiphany t-fdpbit epiphany/t-custom-eqsf"
 	extra_parts="$extra_parts crti.o crtint.o crtrunc.o crtm1reg-r43.o crtm1reg-r63.o crtn.o"
 	;;
 fr30-*-elf)
-- 
2.12.3