(flag_volatile_global): New variable.

(f_options): Add option for it.

From-SVN: r3678

gcc/toplev.c

@@ -354,6 +354,7 @@ int flag_fast_math = 0;
 /* Nonzero means all references through pointers are volatile.  */
 
 int flag_volatile;
+int flag_volatile_global;
 
 /* Nonzero means just do syntax checking; don't output anything.  */
 
@@ -461,6 +462,7 @@ struct { char *string; int *variable; int on_value;} f_options[] =
 {
   {"float-store", &flag_float_store, 1},
   {"volatile", &flag_volatile, 1},
+  {"volatile-global", &flag_volatile_global, 1},
   {"defer-pop", &flag_defer_pop, 1},
   {"omit-frame-pointer", &flag_omit_frame_pointer, 1},
   {"cse-follow-jumps", &flag_cse_follow_jumps, 1},