--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/ada/errno.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,67 @@
+/****************************************************************************
+ *                                                                          *
+ *                 GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS                 *
+ *                                                                          *
+ *                                E R R N O                                 *
+ *                                                                          *
+ *                          C Implementation File                           *
+ *                                                                          *
+ *           Copyright (C) 1992-2012, Free Software Foundation, Inc.        *
+ *                                                                          *
+ * GNAT is free software;  you can  redistribute it  and/or modify it under *
+ * terms of the  GNU General Public License as published  by the Free Soft- *
+ * ware  Foundation;  either version 3,  or (at your option) any later ver- *
+ * sion.  GNAT is distributed in the hope that it will be useful, but WITH- *
+ * OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY *
+ * or FITNESS FOR A PARTICULAR PURPOSE.                                     *
+ *                                                                          *
+ * As a special exception under Section 7 of GPL version 3, you are granted *
+ * additional permissions described in the GCC Runtime Library Exception,   *
+ * version 3.1, as published by the Free Software Foundation.               *
+ *                                                                          *
+ * You should have received a copy of the GNU General Public License and    *
+ * a copy of the GCC Runtime Library Exception along with this program;     *
+ * see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    *
+ * <http://www.gnu.org/licenses/>.                                          *
+ *                                                                          *
+ * GNAT was originally developed  by the GNAT team at  New York University. *
+ * Extensive contributions were provided by Ada Core Technologies Inc.      *
+ *                                                                          *
+ ****************************************************************************/
+
+/* This file provides access to the C-language errno to the Ada interface
+   for POSIX.  It is not possible in general to import errno, even in
+   Ada compilers that allow (as GNAT does) the importation of variables,
+   as it may be defined using a macro.
+*/
+
+
+#define _REENTRANT
+#define _THREAD_SAFE
+
+#ifdef MaRTE
+
+/* MaRTE OS provides its own implementation of errno related functionality. We
+   want to ensure the use of the MaRTE version for tasking programs (the MaRTE
+   library will not be linked if no tasking constructs are used), so we use the
+   weak symbols mechanism to use the MaRTE version whenever is available. */
+
+#pragma weak __get_errno
+#pragma weak __set_errno
+
+#endif
+
+#include <errno.h>
+int
+__get_errno(void)
+{
+  return errno;
+}
+
+#ifndef __ANDROID__
+void
+__set_errno(int err)
+{
+  errno = err;
+}
+#endif