[gcc r13-8614] RTEMS: Add multilib configuration for aarch64

[Sebastian Huber <sh@gcc.gnu.org>]

https://gcc.gnu.org/g:b68995dcafa3412bcf0bfd19947758d807527dd2

commit r13-8614-gb68995dcafa3412bcf0bfd19947758d807527dd2
Author: Sebastian Huber <sebastian.huber@embedded-brains.de>
Date:   Mon Mar 25 08:00:02 2024 +0100

    RTEMS: Add multilib configuration for aarch64
    
    Add a multilib with workarounds for Cortex-A53 errata.
    
    gcc/ChangeLog:
    
            * config.gcc (aarch64-*-rtems*): Add target makefile fragment
            t-aarch64-rtems.
            * config/aarch64/t-aarch64-rtems: New file.
    
    (cherry picked from commit ddee4376d15ddde9280c9a6725ddd76bf33f2871)

Diff:
---
 gcc/config.gcc                     |  1 +
 gcc/config/aarch64/t-aarch64-rtems | 42 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 43 insertions(+)

diff --git a/gcc/config.gcc b/gcc/config.gcc
index 648b3dc2110..c3b73d05eb7 100644
--- a/gcc/config.gcc
+++ b/gcc/config.gcc
@@ -1139,6 +1139,7 @@ aarch64*-*-elf | aarch64*-*-fuchsia* | aarch64*-*-rtems*)
                 ;;
 	aarch64-*-rtems*)
 		tm_file="${tm_file} aarch64/rtems.h rtems.h"
+		tmake_file="${tmake_file} aarch64/t-aarch64-rtems"
 		;;
 	esac
 	case $target in
diff --git a/gcc/config/aarch64/t-aarch64-rtems b/gcc/config/aarch64/t-aarch64-rtems
new file mode 100644
index 00000000000..7598d636165
--- /dev/null
+++ b/gcc/config/aarch64/t-aarch64-rtems
@@ -0,0 +1,42 @@
+# Multilibs for aarch64 RTEMS targets.
+#
+# Copyright (C) 2024 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/>.
+
+MULTILIB_OPTIONS  =
+MULTILIB_DIRNAMES =
+MULTILIB_REQUIRED =
+
+MULTILIB_OPTIONS  += mabi=ilp32
+MULTILIB_DIRNAMES += ilp32
+
+MULTILIB_OPTIONS  += mno-outline-atomics
+MULTILIB_DIRNAMES += nooa
+
+MULTILIB_OPTIONS  += mcpu=cortex-a53
+MULTILIB_DIRNAMES += a53
+
+MULTILIB_OPTIONS  += mfix-cortex-a53-835769
+MULTILIB_DIRNAMES += fix835769
+
+MULTILIB_OPTIONS  += mfix-cortex-a53-843419
+MULTILIB_DIRNAMES += fix843419
+
+MULTILIB_REQUIRED += mabi=ilp32
+MULTILIB_REQUIRED += mabi=ilp32/mno-outline-atomics/mcpu=cortex-a53/mfix-cortex-a53-835769/mfix-cortex-a53-843419
+MULTILIB_REQUIRED += mno-outline-atomics/mcpu=cortex-a53/mfix-cortex-a53-835769/mfix-cortex-a53-843419