[Bug ada/114065] gnat build with -D_TIME_BITS=64 -D_FILE_OFFSET_BITS=64 fails on 32bit archs

["nicolas at debian dot org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114065

Nicolas Boulenguez <nicolas at debian dot org> changed:

           What    |Removed                     |Added
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  Attachment #57926|0                           |1
        is obsolete|                            |

--- Comment #22 from Nicolas Boulenguez <nicolas at debian dot org> ---
Created attachment 58028
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=58028&action=edit
merge all definitions and conversions for timeval and timespec

Hello.

Moving the definitions into System.CRTL was a bad idea because they are needed
before the target libgnat is built.
The attached version 6 creates a new System.C_Time unit.

It also adds a script testing the C_Time functions against handwritten results
on 32 combinations of type sizes for Duration, time_t and suseconds_t.

With the first four patches applied, gcc-13.2.0 (with Debian patches) builds on
x86_64-linux-gnu and arm-linux-gnueabihf.

The following program then gives the correct date on x86_64-linux-gnu but
random dates or Time_Error on arm-linux-gnueabihf.
So the original issue remains.
--
with Ada.Calendar, Ada.Text_IO;
procedure Demo is
   Y : Ada.Calendar.Year_Number;
   M : Ada.Calendar.Month_Number;
   D : Ada.Calendar.Day_Number;
   S : Duration;
   H, Min : Integer;
begin
   Ada.Calendar.Split (Ada.Calendar.Clock, Y, M, D, S);
   H := Integer ((S / 3_600) - 0.5);
   S := S - 3600 * Duration (H);
   Min := Integer ((S / 60) - 0.5);
   S := S - 60 * Duration (Min);
   Ada.Text_IO.Put_Line (Y'Img & M'Img & D'Img & H'Img & Min'Img & S'Img);
end Demo;
--

The commits are rebased on the trunk, with only trivial changes but untested.