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From: "alm at sibmail dot ru" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug bootstrap/64919] bootstrap failure of gcc-4.9.2 on ia64-hpux in libgcc
Date: Wed, 29 Jul 2015 04:23:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64919

--- Comment #10 from Alexander <alm at sibmail dot ru> ---
Have you try to examine core (dwarf-4) produced with this gcc configuration?
Trying this has no luck with gdb-7.x (it is not working at all)
One solution for me is a globally fallback to dwarf-2 (and use gdb 6.3).