Index: gcc/config/aarch64/openbsd.h
--- gcc/config/aarch64/openbsd.h.orig
+++ gcc/config/aarch64/openbsd.h
@@ -0,0 +1,116 @@
+/* Definitions of target machine for GNU compiler, OpenBSD/aarch64 ELF version.
+   Copyright (C) 2002 Free Software Foundation, Inc.
+
+This file is part of GNU CC.
+
+GNU CC 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 2, or (at your option)
+any later version.
+
+GNU CC 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 GNU CC; see the file COPYING.  If not, write to
+the Free Software Foundation, 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+/* Run-time Target Specification.  */
+//#undef TARGET_VERSION
+//#define TARGET_VERSION fputs (" (OpenBSD/arm)", stderr);
+
+/* This is used in ASM_FILE_START.  */
+//#undef ARM_OS_NAME
+//#define ARM_OS_NAME "OpenBSD"
+
+/* This defaults us to little-endian.  */
+#ifndef TARGET_ENDIAN_DEFAULT
+#define TARGET_ENDIAN_DEFAULT 0
+#endif
+
+#undef MULTILIB_DEFAULTS
+
+#define TARGET_OS_CPP_BUILTINS()	\
+  do					\
+    {					\
+      builtin_define ("__GXX_MERGED_TYPEINFO_NAMES=0"); \
+      OPENBSD_OS_CPP_BUILTINS_ELF();	\
+    }					\
+  while (0)
+
+#undef SUBTARGET_CPP_SPEC
+#define SUBTARGET_CPP_SPEC OBSD_CPP_SPEC
+
+#define LINK_SPEC \
+  "%{!shared:%{!nostdlib:%{!r:%{!e*:-e __start}}}} \
+   %{shared:-shared} %{R*} \
+   %{static:-Bstatic} \
+   %{!static:-Bdynamic} \
+   %{rdynamic:-export-dynamic} \
+   %{assert*} \
+   %{!static:-dynamic-linker /usr/libexec/ld.so} \
+   %{!nostdlib:-L/usr/lib}"
+
+#define OPENBSD_ENTRY_POINT "__start"
+
+/* Make GCC agree with <machine/_types.h>.  */
+
+#undef SIZE_TYPE
+#define SIZE_TYPE "long unsigned int"
+
+#undef PTRDIFF_TYPE
+#define PTRDIFF_TYPE "long int"
+
+#undef INTMAX_TYPE
+#define INTMAX_TYPE "long long int"
+
+#undef UINTMAX_TYPE
+#define UINTMAX_TYPE "long long unsigned int"
+
+#undef WCHAR_TYPE
+#define WCHAR_TYPE "int"
+
+#undef WCHAR_TYPE_SIZE
+#define WCHAR_TYPE_SIZE 32
+
+/* Provide a STARTFILE_SPEC appropriate for OpenBSD ELF.  Here we
+   provide support for the special GCC option -static.  On ELF
+   targets, we also add the crtbegin.o file, which provides part
+   of the support for getting C++ file-scope static objects
+   constructed before entering "main".  */
+
+#define OPENBSD_STARTFILE_SPEC	\
+  "%{!shared:			\
+     %{pg:gcrt0%O%s}		\
+     %{!pg:			\
+       %{p:gcrt0%O%s}		\
+       %{!p:%{!static:crt0%O%s} %{static:%{nopie:crt0%O%s} \
+        %{!nopie:rcrt0%O%s}}}}} \
+   %:if-exists(crti%O%s)	\
+   %{static:%:if-exists-else(crtbeginT%O%s crtbegin%O%s)} \
+   %{!static: \
+     %{!shared:crtbegin%O%s} %{shared:crtbeginS%O%s}}"
+
+#undef STARTFILE_SPEC
+#define STARTFILE_SPEC OPENBSD_STARTFILE_SPEC
+
+/* Provide an ENDFILE_SPEC appropriate for OpenBSD ELF.  Here we
+add crtend.o, which provides part of the support for getting
+C++ file-scope static objects deconstructed after exiting "main".  */
+
+#define OPENBSD_ENDFILE_SPEC     \
+  "%{!shared:crtend%O%s} %{shared:crtendS%O%s} \
+   %:if-exists(crtn%O%s)"
+
+#undef ENDFILE_SPEC
+#define ENDFILE_SPEC OPENBSD_ENDFILE_SPEC
+
+/* Remove -mcpu=native handling which is Linux specific */
+#undef DRIVER_SELF_SPECS
+#define DRIVER_SELF_SPECS ""
+
+/* dito */
+#undef EXTRA_SPEC_FUNCTIONS