--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/ada/libgnat/a-calcon.ads	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,113 @@
+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT RUN-TIME COMPONENTS                         --
+--                                                                          --
+--              A D A . C A L E N D A R . C O N V E R S I O N S             --
+--                                                                          --
+--                                 S p e c                                  --
+--                                                                          --
+--          Copyright (C) 2008-2017, 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 package provides various routines for conversion between Ada and Unix
+--  time models - Time, Duration, struct tm and struct timespec.
+
+with Interfaces.C;
+
+package Ada.Calendar.Conversions is
+
+   function To_Ada_Time (Unix_Time : Interfaces.C.long) return Time;
+   --  Convert a time value represented as number of seconds since the
+   --  Unix Epoch to a time value relative to an Ada implementation-defined
+   --  Epoch. The units of the result are nanoseconds on all targets. Raises
+   --  Time_Error if the result cannot fit into a Time value.
+
+   function To_Ada_Time
+     (tm_year  : Interfaces.C.int;
+      tm_mon   : Interfaces.C.int;
+      tm_day   : Interfaces.C.int;
+      tm_hour  : Interfaces.C.int;
+      tm_min   : Interfaces.C.int;
+      tm_sec   : Interfaces.C.int;
+      tm_isdst : Interfaces.C.int) return Time;
+   --  Convert a time value expressed in Unix-like fields of struct tm into
+   --  a Time value relative to the Ada Epoch. The ranges of the formals are
+   --  as follows:
+
+   --     tm_year   --  years since 1900
+   --     tm_mon    --  months since January [0 .. 11]
+   --     tm_day    --  day of the month [1 .. 31]
+   --     tm_hour   --  hours since midnight [0 .. 24]
+   --     tm_min    --  minutes after the hour [0 .. 59]
+   --     tm_sec    --  seconds after the minute [0 .. 60]
+   --     tm_isdst  --  Daylight Savings Time flag [-1 .. 1]
+
+   --  The returned value is in UTC and may or may not contain leap seconds
+   --  depending on whether binder flag "-y" was used. Raises Time_Error if
+   --  the input values are out of the defined ranges or if tm_sec equals 60
+   --  and the instance in time is not a leap second occurrence.
+
+   function To_Duration
+     (tv_sec  : Interfaces.C.long;
+      tv_nsec : Interfaces.C.long) return Duration;
+   --  Convert an elapsed time value expressed in Unix-like fields of struct
+   --  timespec into a Duration value. The expected ranges are:
+
+   --     tv_sec   -  seconds
+   --     tv_nsec  -  nanoseconds
+
+   procedure To_Struct_Timespec
+     (D       : Duration;
+      tv_sec  : out Interfaces.C.long;
+      tv_nsec : out Interfaces.C.long);
+   --  Convert a Duration value into the constituents of struct timespec.
+   --  Formal tv_sec denotes seconds and tv_nsecs denotes nanoseconds.
+
+   procedure To_Struct_Tm
+     (T       : Time;
+      tm_year : out Interfaces.C.int;
+      tm_mon  : out Interfaces.C.int;
+      tm_day  : out Interfaces.C.int;
+      tm_hour : out Interfaces.C.int;
+      tm_min  : out Interfaces.C.int;
+      tm_sec  : out Interfaces.C.int);
+   --  Convert a Time value set in the Ada Epoch into the constituents of
+   --  struct tm. The ranges of the out formals are as follows:
+
+   --     tm_year   --  years since 1900
+   --     tm_mon    --  months since January [0 .. 11]
+   --     tm_day    --  day of the month [1 .. 31]
+   --     tm_hour   --  hours since midnight [0 .. 24]
+   --     tm_min    --  minutes after the hour [0 .. 59]
+   --     tm_sec    --  seconds after the minute [0 .. 60]
+   --     tm_isdst  --  Daylight Savings Time flag [-1 .. 1]
+
+   --  The input date is considered to be in UTC
+
+   function To_Unix_Time (Ada_Time : Time) return Interfaces.C.long;
+   --  Convert a time value represented as number of time units since the Ada
+   --  implementation-defined Epoch to a value relative to the Unix Epoch. The
+   --  units of the result are seconds. Raises Time_Error if the result cannot
+   --  fit into a Time value.
+
+end Ada.Calendar.Conversions;