[Ada]: Remove __gl_zero_cost_exceptions in the binder generated file

[Arnaud Charlet]

This variable wasn't used anymore.
No functional change. 

Tested on x86_64-pc-linux-gnu, committed on trunk

2012-10-04  Tristan Gingold  <gingold@adacore.com>

	* init.c (__gl_zero_cost_exceptions): Comment it as not used
	anymore.
	* bindgen.adb (Gen_Adainit): Do not emit Zero_Cost_Exceptions
	anymore.

-------------- next part --------------
Index: bindgen.adb
===================================================================
--- bindgen.adb	(revision 192066)
+++ bindgen.adb	(working copy)
@@ -137,7 +137,6 @@
    --     Num_Interrupt_States          : Integer;
    --     Unreserve_All_Interrupts      : Integer;
    --     Exception_Tracebacks          : Integer;
-   --     Zero_Cost_Exceptions          : Integer;
    --     Detect_Blocking               : Integer;
    --     Default_Stack_Size            : Integer;
    --     Leap_Seconds_Support          : Integer;
@@ -216,9 +215,6 @@
    --  tracebacks are provided by default, so a value of zero for this
    --  parameter does not necessarily mean no trace backs are available.
 
-   --  Zero_Cost_Exceptions is set to one if zero cost exceptions are used for
-   --  this partition, and to zero if longjmp/setjmp exceptions are used.
-
    --  Detect_Blocking indicates whether pragma Detect_Blocking is active or
    --  not. A value of zero indicates that the pragma is not present, while a
    --  value of 1 signals its presence in the partition.
@@ -607,9 +603,6 @@
                  """__gl_exception_tracebacks"");");
          end if;
 
-         WBI ("      Zero_Cost_Exceptions : Integer;");
-         WBI ("      pragma Import (C, Zero_Cost_Exceptions, " &
-              """__gl_zero_cost_exceptions"");");
          WBI ("      Detect_Blocking : Integer;");
          WBI ("      pragma Import (C, Detect_Blocking, " &
               """__gl_detect_blocking"");");
@@ -803,17 +796,6 @@
             WBI ("      Exception_Tracebacks := 1;");
          end if;
 
-         Set_String ("      Zero_Cost_Exceptions := ");
-
-         if Zero_Cost_Exceptions_Specified then
-            Set_String ("1");
-         else
-            Set_String ("0");
-         end if;
-
-         Set_String (";");
-         Write_Statement_Buffer;
-
          Set_String ("      Detect_Blocking := ");
 
          if Detect_Blocking then
Index: init.c
===================================================================
--- init.c	(revision 192066)
+++ init.c	(working copy)
@@ -103,12 +103,14 @@
 int   __gl_num_interrupt_states          = 0;
 int   __gl_unreserve_all_interrupts      = 0;
 int   __gl_exception_tracebacks          = 0;
-int   __gl_zero_cost_exceptions          = 0;
 int   __gl_detect_blocking               = 0;
 int   __gl_default_stack_size            = -1;
 int   __gl_leap_seconds_support          = 0;
 int   __gl_canonical_streams             = 0;
 
+/* This value is not used anymore, but kept for bootstrapping purpose.  */
+int   __gl_zero_cost_exceptions          = 0;
+
 /* Indication of whether synchronous signal handler has already been
    installed by a previous call to adainit.  */
 int  __gnat_handler_installed      = 0;