--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/config/i386/cygwin-w64.h	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,84 @@
+/* Operating system specific defines to be used when targeting GCC for
+   hosting on Windows 32/64 via Cygwin runtime, using GNU tools and
+   the Windows API Library.
+   Copyright (C) 2013-2017 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 multilib.  */
+
+#undef ASM_SPEC
+#define ASM_SPEC "%{m32:--32} %{m64:--64}"
+
+/* To implement C++ function replacement we always wrap the cxx
+   malloc-like operators.  See N2800 #17.6.4.6 [replacement.functions] */
+#undef CXX_WRAP_SPEC_LIST
+#define CXX_WRAP_SPEC_LIST " \
+  --wrap _Znwm \
+  --wrap _Znam \
+  --wrap _ZdlPv \
+  --wrap _ZdaPv \
+  --wrap _ZnwmRKSt9nothrow_t \
+  --wrap _ZnamRKSt9nothrow_t \
+  --wrap _ZdlPvRKSt9nothrow_t \
+  --wrap _ZdaPvRKSt9nothrow_t \
+"
+
+#undef SPEC_32
+#undef SPEC_64
+#define SPEC_32 "m32"
+#define SPEC_64 "!m32"
+
+#undef SUB_LINK_ENTRY32
+#undef SUB_LINK_ENTRY64
+#define SUB_LINK_ENTRY32 "-e __cygwin_dll_entry@12"
+#define SUB_LINK_ENTRY64 "-e _cygwin_dll_entry"
+
+#undef SUB_LINK_SPEC
+#undef SUB_LINK_ENTRY
+#define SUB_LINK_SPEC "%{" SPEC_64 ":-m i386pep} %{" SPEC_32 ":-m i386pe}"
+#define SUB_LINK_ENTRY "%{" SPEC_64 ":" SUB_LINK_ENTRY64 "} %{" SPEC_32 ":" SUB_LINK_ENTRY32 "}"
+
+#undef MULTILIB_DEFAULTS
+#define MULTILIB_DEFAULTS { "m64" }
+
+#undef LINK_SPEC
+#define LINK_SPEC SUB_LINK_SPEC "\
+  %{mwindows:--subsystem windows} \
+  %{mconsole:--subsystem console} \
+  " CXX_WRAP_SPEC " \
+  %{shared: %{mdll: %eshared and mdll are not compatible}} \
+  %{shared: --shared} %{mdll:--dll} \
+  %{static:-Bstatic} %{!static:-Bdynamic} \
+  %{shared|mdll: " SUB_LINK_ENTRY " --enable-auto-image-base} \
+  %(shared_libgcc_undefs) \
+  --dll-search-prefix=cyg \
+  %{!shared: %{!mdll: %{" SPEC_32 ":--large-address-aware} --tsaware}}"
+
+/* Cygwin64 will have a 64-bit long type. */
+#undef LONG_TYPE_SIZE
+#undef LONG_TYPE_SIZE
+#define LONG_TYPE_SIZE (TARGET_64BIT ? 64 : 32)
+
+/* Override default "long long unsigned int" from cygming.h. */
+#undef SIZE_TYPE
+#define SIZE_TYPE (TARGET_64BIT ? "long unsigned int" : "unsigned int")
+#undef PTRDIFF_TYPE
+#define PTRDIFF_TYPE (TARGET_64BIT ? "long int" : "int")
+
+#undef LIBGCC_SONAME
+#define LIBGCC_SONAME "cyggcc_s-seh-1.dll"