zephyr: xtensa: enable multilib to build for call0 ABI

This enables multilib builds for Zephyr Xtensa toolchains
supporting both CALL0 and Windowed ABIs.

Signed-off-by: Daniel Leung <daniel.leung@intel.com>

Author: dcpleung

gcc/config.gcc

@@ -3600,6 +3600,11 @@ xstormy16-*-elf)
 	extra_options=stormy16/stormy16.opt
 	tmake_file="stormy16/t-stormy16"
 	;;
+xtensa*-*_zephyr-elf*)
+	tm_file="${tm_file} elfos.h newlib-stdint.h xtensa/elf.h"
+	extra_options="${extra_options} xtensa/elf.opt"
+	tmake_file="${tmake_file} xtensa/t-zephyr"
+	;;
 xtensa*-*-elf*)
 	tm_file="${tm_file} elfos.h newlib-stdint.h xtensa/elf.h"
 	extra_options="${extra_options} xtensa/elf.opt"

gcc/config/xtensa/t-zephyr

@@ -0,0 +1,23 @@
+# Copyright (C) 2016, 2023 Intel Corporation.
+#
+# 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/>.
+#
+
+MULTILIB_OPTIONS += mabi=call0
+MULTILIB_DIRNAMES += call0
+#MULTILIB_MATCHES = mabi=call0
+#MULTILIB_EXCEPTIONS =

libgcc/config.host

@@ -1531,6 +1531,11 @@ visium-*-elf*)
 xstormy16-*-elf)
 	tmake_file="stormy16/t-stormy16 t-fdpbit"
 	;;
+xtensa*-*_zephyr-elf*)
+	tmake_file="$tmake_file xtensa/t-xtensa xtensa/t-elf"
+	extra_parts="$extra_parts crti.o crtn.o"
+	tmake_file="${tmake_file} xtensa/t-zephyr"
+	;;
 xtensa*-*-elf*)
 	tmake_file="$tmake_file xtensa/t-xtensa xtensa/t-elf"
 	extra_parts="$extra_parts crti.o crtn.o"