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From: "jason at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/60002] ICE: SIGSEGV in skip_artificial_parms_for() with -O2 -fcompare-debug -fdeclone-ctor-dtor -fipa-cp-clone
Date: Fri, 31 Jan 2014 18:09:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60002

--- Comment #3 from Jason Merrill <jason at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #2)
> +  /* The FE might have information and assumptions about the other
> +     arguments.  */
> +  DECL_LANG_SPECIFIC (new_decl) = NULL;

If that passes testing, it's OK.