--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/config/arc/linux.h	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,93 @@
+/* Target macros for arc*-*-linux targets.
+
+   Copyright (C) 2017 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/>.  */
+
+/* Enable DWARF 2 exceptions.  */
+#undef DWARF2_UNWIND_INFO
+#define DWARF2_UNWIND_INFO 1
+
+#define TARGET_OS_CPP_BUILTINS()		\
+  do						\
+    {						\
+      GNU_USER_TARGET_OS_CPP_BUILTINS ();	\
+    }						\
+  while (0)
+
+#define GLIBC_DYNAMIC_LINKER   "/lib/ld-linux.so.2"
+#define UCLIBC_DYNAMIC_LINKER  "/lib/ld-uClibc.so.0"
+
+/* Note that the default is to link against dynamic libraries, if they are
+   available.  Override with -static.  */
+#undef LINK_SPEC
+#define LINK_SPEC "%{h*} \
+  %{static:-Bstatic} \
+  %{shared:-shared} \
+  %{symbolic:-Bsymbolic} \
+  %{!static: \
+    %{rdynamic:-export-dynamic} \
+    %{!shared:-dynamic-linker " GNU_USER_DYNAMIC_LINKER "}} \
+  -X \
+  %{mbig-endian:-EB} %{EB} %{EL} \
+  %{!z:-z max-page-size=0x2000 -z common-page-size=0x2000} \
+  %{mcpu=nps400:-marclinux_nps; :-marclinux}"
+
+#undef STARTFILE_SPEC
+#define STARTFILE_SPEC							\
+  LINUX_OR_ANDROID_LD (GNU_USER_TARGET_STARTFILE_SPEC, ANDROID_STARTFILE_SPEC)
+
+#undef ENDFILE_SPEC
+#define ENDFILE_SPEC							\
+  LINUX_OR_ANDROID_LD (GNU_USER_TARGET_ENDFILE_SPEC, ANDROID_ENDFILE_SPEC)
+
+#undef LIB_SPEC
+#define LIB_SPEC  \
+  "%{pthread:-lpthread} \
+   %{shared:-lc} \
+   %{!shared:%{profile:-lc_p}%{!profile:-lc}}"
+
+#define TARGET_ASM_FILE_END file_end_indicate_exec_stack
+
+/* No SDATA default for linux.  */
+#undef TARGET_SDATA_DEFAULT
+#define TARGET_SDATA_DEFAULT 0
+
+/* We have medium calls.  */
+#undef TARGET_MMEDIUM_CALLS_DEFAULT
+#define TARGET_MMEDIUM_CALLS_DEFAULT 1
+
+/* We do not have any MULTILIB_OPTIONS specified, so there are no
+   MULTILIB_DEFAULTS.  */
+#undef  MULTILIB_DEFAULTS
+
+/* Linux toolchains use r25 as the thread pointer register.  */
+#undef TARGET_ARC_TP_REGNO_DEFAULT
+#define TARGET_ARC_TP_REGNO_DEFAULT 25
+
+#undef SUBTARGET_CPP_SPEC
+#define SUBTARGET_CPP_SPEC "\
+   %{pthread:-D_REENTRANT} \
+"
+
+/* Indexed loads are default off.  */
+#undef TARGET_INDEXED_LOADS_DEFAULT
+#define TARGET_INDEXED_LOADS_DEFAULT 0
+
+/* Pre/post modify with register displacement are default off.  */
+#undef TARGET_AUTO_MODIFY_REG_DEFAULT
+#define TARGET_AUTO_MODIFY_REG_DEFAULT 0