system-freebsd-x86_64.ads (Backend_Overflow_Checks): Set true True.

2011-08-29  Thomas Quinot  <quinot@adacore.com>

	* system-freebsd-x86_64.ads (Backend_Overflow_Checks): Set true True.
	Remove unused variables.

From-SVN: r178229

gcc/ada/ChangeLog

+2011-08-29  Thomas Quinot  <quinot@adacore.com>
+
+	* system-freebsd-x86_64.ads (Backend_Overflow_Checks): Set true True.
+	Remove unused variables.
+
 2011-08-29  Ed Schonberg  <schonberg@adacore.com>
 
 	* sem_res.adb: Remove Build_Explicit_Dereference.

gcc/ada/system-freebsd-x86_64.ads

@@ -7,7 +7,7 @@
 --                                 S p e c                                  --
 --                         (FreeBSD/x86_64 Version)                         --
 --                                                                          --
---          Copyright (C) 1992-2009, Free Software Foundation, Inc.         --
+--          Copyright (C) 1992-2011, Free Software Foundation, Inc.         --
 --                                                                          --
 -- This specification is derived from the Ada Reference Manual for use with --
 -- GNAT. The copyright notice above, and the license provisions that follow --
@@ -116,7 +116,7 @@ private
    --  of the individual switch values.
 
    Backend_Divide_Checks     : constant Boolean := False;
-   Backend_Overflow_Checks   : constant Boolean := False;
+   Backend_Overflow_Checks   : constant Boolean := True;
    Command_Line_Args         : constant Boolean := True;
    Configurable_Run_Time     : constant Boolean := False;
    Denorm                    : constant Boolean := True;
@@ -131,7 +131,6 @@ private
    Stack_Check_Default       : constant Boolean := False;
    Stack_Check_Probes        : constant Boolean := True;
    Stack_Check_Limits        : constant Boolean := False;
-   Support_64_Bit_Divides    : constant Boolean := True;
    Support_Aggregates        : constant Boolean := True;
    Support_Composite_Assign  : constant Boolean := True;
    Support_Composite_Compare : constant Boolean := True;
@@ -140,6 +139,5 @@ private
    Suppress_Standard_Library : constant Boolean := False;
    Use_Ada_Main_Program_Name : constant Boolean := False;
    ZCX_By_Default            : constant Boolean := True;
-   GCC_ZCX_Support           : constant Boolean := True;
 
 end System;