s-winext.ads: Replace representation clause by pragma Pack.

	* s-winext.ads: Replace representation clause by pragma Pack. Gives
	equivalent representation, but has the advantage of allowing
	compilation of this file under 64 bits platforms.

	* s-os_lib.adb (Normalize_Pathname): Mark Cur_Dir constant.

	* s-osinte-irix.ads: (Alternate_Stack_Size): Add dummy declaration.

	* adaint.c: 
	Don't define dummy implementation of convert_addresses on ppc-linux.

From-SVN: r135649

gcc/ada/adaint.c

@@ -2882,6 +2882,7 @@ _flush_cache()
       && defined (__SVR4)) \
       && ! (defined (linux) && (defined (i386) || defined (__x86_64__))) \
       && ! (defined (linux) && defined (__ia64__)) \
+      && ! (defined (linux) && defined (powerpc)) \
       && ! defined (__FreeBSD__) \
       && ! defined (__hpux__) \
       && ! defined (__APPLE__) \

gcc/ada/s-os_lib.adb

@@ -1896,7 +1896,7 @@ package body System.OS_Lib is
         and then Path_Buffer (2) /= Directory_Separator
       then
          declare
-            Cur_Dir : String := Get_Directory ("");
+            Cur_Dir : constant String := Get_Directory ("");
             --  Get the current directory to get the drive letter
 
          begin

gcc/ada/s-osinte-irix.ads

@@ -261,6 +261,13 @@ package System.OS_Interface is
 
    PTHREAD_CREATE_DETACHED : constant := 1;
 
+   -----------
+   -- Stack --
+   -----------
+
+   Alternate_Stack_Size : constant := 0;
+   --  No alternate signal stack is used on this platform
+
    ---------------------------------------
    -- Nonstandard Thread Initialization --
    ---------------------------------------

gcc/ada/s-winext.ads

@@ -98,37 +98,7 @@ package System.Win32.Ext is
       wReserved1        : WORD;
    end record;
    pragma Convention (C, DCB);
-
-   for DCB use record
-      DCBLENGTH         at  0 range 0 .. 31;
-      BaudRate          at  4 range 0 .. 31;
-      fBinary           at  8 range 0 .. 0;
-      fParity           at  8 range 1 .. 1;
-      fOutxCtsFlow      at  8 range 2 .. 2;
-      fOutxDsrFlow      at  8 range 3 .. 3;
-      fDtrControl       at  8 range 4 .. 5;
-      fDsrSensitivity   at  8 range 6 .. 6;
-      fTXContinueOnXoff at  8 range 7 .. 7;
-      fOutX             at  9 range 0 .. 0;
-      fInX              at  9 range 1 .. 1;
-      fErrorChar        at  9 range 2 .. 2;
-      fNull             at  9 range 3 .. 3;
-      fRtsControl       at  9 range 4 .. 5;
-      fAbortOnError     at  9 range 6 .. 6;
-      fDummy2           at  9 range 7 .. 23;
-      wReserved         at 12 range 0 .. 15;
-      XonLim            at 14 range 0 .. 15;
-      XoffLim           at 16 range 0 .. 15;
-      ByteSize          at 18 range 0 .. 7;
-      Parity            at 19 range 0 .. 7;
-      StopBits          at 20 range 0 .. 7;
-      XonChar           at 21 range 0 .. 7;
-      XoffChar          at 22 range 0 .. 7;
-      ErrorChar         at 23 range 0 .. 7;
-      EofChar           at 24 range 0 .. 7;
-      EvtChar           at 25 range 0 .. 7;
-      wReserved1        at 26 range 0 .. 15;
-   end record;
+   pragma Pack (DCB);
 
    type COMMTIMEOUTS is record
       ReadIntervalTimeout         : DWORD;