--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/ada/libgnat/s-scaval.ads	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,93 @@
+------------------------------------------------------------------------------
+--                                                                          --
+--                          GNAT RUN-TIME COMPONENTS                        --
+--                                                                          --
+--                  S Y S T E M . S C A L A R _ V A L U E S                 --
+--                                                                          --
+--                                 S p e c                                  --
+--                                                                          --
+--          Copyright (C) 2001-2017, 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 defines the constants used for initializing scalar values
+--  when pragma Initialize_Scalars is used. The actual values are defined
+--  in the binder generated file. This package contains the Ada names that
+--  are used by the generated code, which are linked to the actual values
+--  by the use of pragma Import.
+
+package System.Scalar_Values is
+
+   --  Note: logically this package should be Pure since it can be accessed
+   --  from pure units, but the IS_xxx variables below get set at run time,
+   --  so they have to be library level variables. In fact we only ever
+   --  access this from generated code, and the compiler knows that it is
+   --  OK to access this unit from generated code.
+
+   type Byte1 is mod 2 **  8;
+   type Byte2 is mod 2 ** 16;
+   type Byte4 is mod 2 ** 32;
+   type Byte8 is mod 2 ** 64;
+
+   --  The explicit initializations here are not really required, since these
+   --  variables are always set by System.Scalar_Values.Initialize.
+
+   IS_Is1 : Byte1 := 0;  -- Initialize 1 byte signed
+   IS_Is2 : Byte2 := 0;  -- Initialize 2 byte signed
+   IS_Is4 : Byte4 := 0;  -- Initialize 4 byte signed
+   IS_Is8 : Byte8 := 0;  -- Initialize 8 byte signed
+   --  For the above cases, the undefined value (set by the binder -Sin switch)
+   --  is the largest negative number (1 followed by all zero bits).
+
+   IS_Iu1 : Byte1 := 0;  -- Initialize 1 byte unsigned
+   IS_Iu2 : Byte2 := 0;  -- Initialize 2 byte unsigned
+   IS_Iu4 : Byte4 := 0;  -- Initialize 4 byte unsigned
+   IS_Iu8 : Byte8 := 0;  -- Initialize 8 byte unsigned
+   --  For the above cases, the undefined value (set by the binder -Sin switch)
+   --  is the largest unsigned number (all 1 bits).
+
+   IS_Iz1 : Byte1 := 0;  -- Initialize 1 byte zeroes
+   IS_Iz2 : Byte2 := 0;  -- Initialize 2 byte zeroes
+   IS_Iz4 : Byte4 := 0;  -- Initialize 4 byte zeroes
+   IS_Iz8 : Byte8 := 0;  -- Initialize 8 byte zeroes
+   --  For the above cases, the undefined value (set by the binder -Sin switch)
+   --  is the zero (all 0 bits). This is used when zero is known to be an
+   --  invalid value.
+
+   --  The float definitions are aliased, because we use overlays to set them
+
+   IS_Isf : aliased Short_Float     := 0.0;  -- Initialize short float
+   IS_Ifl : aliased Float           := 0.0;  -- Initialize float
+   IS_Ilf : aliased Long_Float      := 0.0;  -- Initialize long float
+   IS_Ill : aliased Long_Long_Float := 0.0;  -- Initialize long long float
+
+   procedure Initialize (Mode1 : Character; Mode2 : Character);
+   --  This procedure is called from the binder when Initialize_Scalars mode
+   --  is active. The arguments are the two characters from the -S switch,
+   --  with letters forced upper case. So for example if -S5a is given, then
+   --  Mode1 will be '5' and Mode2 will be 'A'. If the parameters are EV,
+   --  then this routine reads the environment variable GNAT_INIT_SCALARS.
+   --  The possible settings are the same as those for the -S switch (except
+   --  for EV), i.e. IN/LO/HO/xx, xx = 2 hex digits. If no -S switch is given
+   --  then the default of IN (invalid values) is passed on the call.
+
+end System.Scalar_Values;