--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/config/libstdc++-raw-cxx.m4	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,30 @@
+# 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/>.
+
+# Define flags, LIBSTDCXX_RAW_CXX_CXXFLAGS and # LIBSTDCXX_RAW_CXX_LDFLAGS,
+# for libstdc++-v3 header files to compile and link libraries in C++ with
+# raw_cxx=true.
+AC_DEFUN([GCC_LIBSTDCXX_RAW_CXX_FLAGS], [
+  AC_REQUIRE([ACX_NONCANONICAL_TARGET])
+  LIBSTDCXX_RAW_CXX_CXXFLAGS="\
+    -I\$(top_builddir)/../libstdc++-v3/include \
+    -I\$(top_builddir)/../libstdc++-v3/include/\$(target_noncanonical) \
+    -I\$(top_srcdir)/../libstdc++-v3/libsupc++"
+  LIBSTDCXX_RAW_CXX_LDFLAGS="\
+    \$(top_builddir)/../libstdc++-v3/src/libstdc++.la"
+  AC_SUBST(LIBSTDCXX_RAW_CXX_CXXFLAGS)
+  AC_SUBST(LIBSTDCXX_RAW_CXX_LDFLAGS)
+])