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Re: New compiler crash for PR8361


Andrew Pinski <pinskia@physics.uc.edu> writes:

> On Thursday, Jul 17, 2003, at 08:17 US/Eastern, Gerald Pfeifer wrote:
> 
> > Normally I'd just file a PR, but PR8361 has a critical example for
> > compile-time performance problems, and since <24 hours (I believe)
> > mainline now crashes while compiling it with -O3.
> 
> In fact there is already a PR for this, PR11545.
> Bug 8361 is already depends on it in bugzilla.
>  From bug 11545:
> Really from bug 11592:
> Doing a regression search, it looks like this problem first appeared
> after the big change on Jul 11 from Geoffrey Keating
> <geoffk@apple.com>:
> 
> 2003-07-11  Geoffrey Keating  <geoffk@apple.com>
> 
> 	* c-decl.c (finish_decl): Handle 'used' here...
> 	* cgraphunit.c (cgraph_finalize_function): ... and here ...
> 	* c-common.c: (handle_used_attribute): ... not here.
>          ...
>          ...
> 
> In particular, i found that if i reverted his change to
> cgraph.h:
> 
> 	* cgraph.h (struct cgraph_node): Add chain_next and chain_prev GTY
> 	options.
> 
> then the crash went away.
> 
> A simple include of iostream causes this segfault (you have to use
> "--param ggc-min-
> expand=0 --param ggc-min-heapsize=0" which forces gc to happen always).

This seems to be a problem with data structure corruption in the
cgraph code.  Jan is looking at it, but you can work around it by
removing the chain_prev option from 'struct cgraph_node'.

-- 
- Geoffrey Keating <geoffk@geoffk.org>


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