--- gcc/ada/targparm.ads.orig	Wed Dec 19 16:22:26 2007
+++ gcc/ada/targparm.ads	Wed Feb 13 20:02:42 2008
@@ -381,9 +381,11 @@
    --  allows that standard format to be modified.
 
    Duration_32_Bits_On_Target : Boolean := False;
+   --  Default_Duration_Delta_Microseconds : Pos := 1_000;
    --  If True, then Duration is represented in 32 bits and the delta and
-   --  small values are set to 20.0*(10**(-3)) (i.e. it is a count in units
-   --  of 20 milliseconds.
+   --  and small values are set to Duration_Delta_Microseconds*(10**(-6))
+   --  (i.e. for Duration_Delta_Microseconds = 20000 it is a count in
+   --  units of 20 milliseconds.
 
    ------------------------------------
    -- Back-End Code Generation Flags --
--- gcc/ada/switch-c.adb.orig	Thu Dec 13 10:20:52 2007
+++ gcc/ada/switch-c.adb	Wed Feb 13 20:08:37 2008
@@ -345,6 +345,19 @@
 
                      return;
 
+                  --  -gnated switch (Duration'Delta)
+
+                  when 'd' =>
+                     Ptr := Ptr + 1;
+
+                     --  Possible '=' sign between -gnated and the value
+                     if Ptr <= Max and then Switch_Chars (Ptr) = '=' then
+                        Ptr := Ptr + 1;
+                     end if;
+
+                     Scan_Pos (Switch_Chars, Max, Ptr,
+                               Opt.Duration_Delta_Microseconds, C);
+
                   --  -gnateD switch (preprocessing symbol definition)
 
                   when 'D' =>
--- gcc/ada/opt.ads.orig	Thu Dec 13 10:22:25 2007
+++ gcc/ada/opt.ads	Wed Feb 13 20:14:03 2008
@@ -360,6 +360,10 @@
    --  Set to True (by -gnatL) to dump source text intermingled with generated
    --  code. Effective only if either of Debug/Print_Generated_Code is true.
 
+   Duration_Delta_Microseconds : Pos := 1_000;
+   --  GNAT
+   --  set to the time tick on the target
+
    Dynamic_Elaboration_Checks : Boolean := False;
    --  GNAT
    --  Set True for dynamic elaboration checking mode, as set by the -gnatE
--- gcc/ada/cstand.adb.orig	Mon Sep 10 12:47:10 2007
+++ gcc/ada/cstand.adb	Wed Feb 13 20:02:42 2008
@@ -1209,7 +1209,8 @@
          if Duration_32_Bits_On_Target then
             Dlo := Intval (Type_Low_Bound (Standard_Integer_32));
             Dhi := Intval (Type_High_Bound (Standard_Integer_32));
-            Delta_Val := UR_From_Components (UI_From_Int (20), Uint_3, 10);
+            Delta_Val := UR_From_Components
+              (UI_From_Int (Duration_Delta_Microseconds), Uint_6, 10);
 
          --  In standard 64-bit mode, the size is 64-bits and the delta and
          --  small values are set to nanoseconds (1.0**(10.0**(-9))