[RFC][BZ #7233] Do not let tr_break call be optimized away.

[Ondřej Bílka]

On Fri, Oct 25, 2013 at 03:46:19PM +0530, Siddhesh Poyarekar wrote:
> On Thu, Oct 17, 2013 at 08:09:04PM +0200, Ondřej Bílka wrote:
> > Hi,
> > 
> > In following bug a gcc optimizes tr_break call in tr_freehook. Adding
> > side effect prevents that.
> 
> So what is the problem with optimizing the call?
> 
> Siddhesh

/* This function is called when the block being alloc'd, realloc'd, or
   freed has an address matching the variable "mallwatch".  In a debugger,
   set "mallwatch" to the address of interest, then put a breakpoint on
   tr_break.  */

debugger will not stop when it is optimized away.