[Bug middle-end/51521] [4.7 Regression]: build fails on cris-elf building libstdc++-v3: verify_flow_info failed

["rguenth at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51521

--- Comment #6 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-12-13 14:12:57 UTC ---
(In reply to comment #5)
> (In reply to comment #4)
> > (In reply to comment #3)
> > > Hi Richard,
> > > 
> > > May you please take a look at this message where I describe why I had done the
> > > change:
> > > http://codereview.appspot.com/5486043/#msg6
> > > 
> > > The edge w/o EDGE_FALLTHRU also causes internal errors when I try to split it.
> > > 
> > > > The EDGE_FALLTHRU flag is wrong if any of EDGE_TRUE/FALSE_* is added which
> > > is probably what happens.  Thus the patch was wrong.
> > > 
> > > But when I set EDGE_FALLTHRU there is no EDGE_TRUE/FALSE_* yet (the flags were
> > > 0). So, isn't it who adds EDGE_TRUE/FALSE_* must reset EDGE_FALLTHRU?
> > 
> > See at the single user of the function you changed.  It continues to
> > add BBs and edges.
> > 
> > Please debug the new testsuite failures (which you should have seen during
> > your testing) and see why your flag setting is incorrect.
> 
> 'I've done full 3 stage build for all front-ends, then 'make bootstrap', then
> diff output of 'make check-gcc -j16 RUNTESTFLAGS="dg.exp"''
> 
> That is wrong.  You should do 'make check-gcc -j16', without restricting
> the set of testcases run to dg.exp.

Err, and to C.  The proper way is

make -k check -j16