Fix bug reported by Thomas Petazzoni <thomas.petazzoni@free-electrons.com>:

 See: http://sourceware.org/ml/crossgcc/2009-05/msg00055.html

      https://bugzilla.redhat.com/show_bug.cgi?id=436037

 Fix from: http://cvs.fedoraproject.org/viewvc/devel/gdb/gdb-6.8-bz436037-reg-no-longer-active.patch?revision=1.1

 diff -d -urpN src.0/gdb/valops.c src.1/gdb/valops.c

 --- src.0/gdb/valops.c	2008-07-27 04:00:03.000000000 +0200

 +++ src.1/gdb/valops.c	2008-07-31 15:17:42.000000000 +0200

 @@ -813,10 +813,18 @@ value_assign (struct value *toval, struc

  	struct frame_info *frame;

  	int value_reg;

 -	/* Figure out which frame this is in currently.  */

 -	frame = frame_find_by_id (VALUE_FRAME_ID (toval));

  	value_reg = VALUE_REGNUM (toval);

 +	/* Figure out which frame this is in currently.  */

 +	frame = frame_find_by_id (VALUE_FRAME_ID (toval));

 +	/* "set $reg+=1" should work on programs with no debug info,

 +	   but frame_find_by_id returns NULL here (RH bug 436037).

 +	   Use current frame, it represents CPU state in this case.

 +	   If frame_find_by_id is changed to do it internally

 +	   (it is contemplated there), remove this.  */

 +	if (!frame)

 +	  frame = get_current_frame ();

 +	/* Probably never happens.  */

  	if (!frame)

  	  error (_("Value being assigned to is no longer active."));