Please revert the patches in bug #54040 and #59346 and special case x32

[Svante Signell]

In reply to the thread ending with:
http://gcc.gnu.org/ml/gcc-patches/2013-11/msg02069.html

and bugs:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54040
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59346

Changing s-osinte-posix.adb

-  tv_nsec => long (Long_Long_Integer (F * 10#1#E9)));
+  tv_nsec => time_t (Long_Long_Integer (F * 10#1#E9)));

breaks the build for kFreeBSD and Hurd too (in addition to hpux and solaris).

Note that POSIX specified tv_nsec to be long (i.e. 64 bit), see:
http://pubs.opengroup.org/onlinepubs/009695299/basedefs/time.h.html
The <time.h> header shall declare the structure timespec, which has at
least the following members:
time_t  tv_sec    Seconds. 
long    tv_nsec   Nanoseconds.

Additionally Linux/kFreeBSD/Hurd all defines struct timespec in time.h as follows:
/* POSIX.1b structure for a time value.  This is like a `struct timeval'
but
   has nanoseconds instead of microseconds.  */
struct timespec
  {
    __time_t tv_sec;            /* Seconds.  */
    __syscall_slong_t tv_nsec;  /* Nanoseconds.  */
  };

So defining tv_nsec to be time_t is completely wrong. The problem seems
to be present only for the x32 architecture, so why not make a special-case
solution for that arch. Obviously x32 is non-POSIX compliant since long
is 32 bits, resulting in tv_nsec being 32 bits where it needs to be 64
bits. Isn't it possible to handle the differences for x32 with a
s-osinte-linux-x32.ads file, even with s-osinte-posix.adb stays intact?

Then ther changes would be limited to:
        * s-linux-x32.ads: New file.
        * s-osprim-x32.adb: Likewise.
        * gcc-interface/Makefile.in (LIBGNAT_TARGET_PAIRS): Replace
        s-linux.ads with s-linux-x32.ads, s-osprim-posix.adb with
        s-osprim-x32.adb for x32.
and the rest would be obsolete:
        * s-linux.ads (time_t): New type.
        * s-linux-alpha.ads (time_t):  Likewise.
        * s-linux-hppa.ads (time_t):  Likewise.
        * s-linux-mipsel.ads (time_t):  Likewise.
        * s-linux-sparc.ads (time_t):  Likewise.
        * s-osinte-linux.ads (time_t): Mark it private.  Replace long
        with System.Linux.time_t.
        (timespec): Replace long with time_t.
        * s-osinte-posix.adb (To_Timespec): Likewise.
        * s-taprop-linux.adb (timeval): Replace C.long with
        System.OS_Interface.time_t.
and
       * s-osinte-hpux.ads (timespec): Change type of tv_nsec field to time_t.
       * s-osinte-kfreebsd-gnu.ads (timespec): Likewise.
       * s-osinte-solaris-posix.ads (timespec): Likewise.

Possible content in s-osinte-linux-x32.ads would be:
   type tv_nsec_t is private;
   type tv_nsec_t is new Long_Long_Integer;
   type timespec is record
      tv_sec  : time_t;
      tv_nsec : tv_nsec_t;
   end record;
   pragma Convention (C, timespec);