[Ping v2][PATCH] Add patch for debugging compiler ICEs.

Joseph S. Myers joseph@codesourcery.com
Wed Sep 10 16:37:00 GMT 2014


On Wed, 10 Sep 2014, Jakub Jelinek wrote:

> On Tue, Sep 09, 2014 at 10:51:23PM +0000, Joseph S. Myers wrote:
> > On Thu, 28 Aug 2014, Maxim Ostapenko wrote:
> > 
> > > diff --git a/gcc/diagnostic.c b/gcc/diagnostic.c
> > > index 0cc7593..67b8c5b 100644
> > > --- a/gcc/diagnostic.c
> > > +++ b/gcc/diagnostic.c
> > > @@ -492,7 +492,7 @@ diagnostic_action_after_output (diagnostic_context *context,
> > >  	real_abort ();
> > >        diagnostic_finish (context);
> > >        fnotice (stderr, "compilation terminated.\n");
> > > -      exit (FATAL_EXIT_CODE);
> > > +      exit (ICE_EXIT_CODE);
> > 
> > Why?  This is the case for fatal_error.  FATAL_EXIT_CODE seems right for 
> > this, and ICE_EXIT_CODE wrong.
> 
> So that the driver can understand the difference between an ICE and other
> fatal errors (e.g. sorry etc.).
> Users are typically using the driver and for them it matters what exit code
> is returned from the driver, not from cc1/cc1plus etc.

Well, I think the next revision of the patch submission needs more 
explanation in this area.  What exit codes do cc1 and the driver now 
return for (normal error, fatal error, ICE), and what do they return after 
the patch, and how does the change to the fatal_error case avoid incorrect 
changes if either cc1 or the driver called fatal_error (as opposed to 
either cc1 or the driver having an ICE)?  Maybe that explanation should be 
in the form of a comment on this exit call, explaining why the 
counterintuitive use of ICE_EXIT_CODE in the DK_FATAL case is correct.

-- 
Joseph S. Myers
joseph@codesourcery.com



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