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Date:      Tue, 8 Dec 2015 19:50:49 +0100
From:      Dimitry Andric <dim@FreeBSD.org>
To:        Ray Newman <ray@woopwoop.com>
Cc:        FreeBSD-current@FreeBSD.org
Subject:   Re: Dwarf problem with gcc and gdb
Message-ID:  <52DCC05E-EC7B-42D2-B46C-EB3816CFA7A1@FreeBSD.org>
In-Reply-To: <CBA7FABE-5869-4A17-8858-D4A9AD14D830@woopwoop.com>
References:  <CBA7FABE-5869-4A17-8858-D4A9AD14D830@woopwoop.com>

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On 08 Dec 2015, at 10:02, Ray Newman <ray@woopwoop.com> wrote:
>=20
> Compiled using gcc (FreeBSD Ports Collection) 4.8.5 on arm (Raspberry =
Pi - several versions); BSDmakefile attached (make test used).
> gdb gives:
> GNU gdb 6.1.1 [FreeBSD]
> Copyright 2004 Free Software Foundation, Inc.
> GDB is free software, covered by the GNU General Public License, and =
you are
> welcome to change it and/or distribute copies of it under certain =
conditions.
> Type "show copying" to see the conditions.
> There is absolutely no warranty for GDB.  Type "show warranty" for =
details.
> This GDB was configured as "armv6-marcel-freebsd"...Dwarf Error: wrong =
version in compilation unit header (is 4, should be 2) [in module =
/home/ray/mumps/mumps]
>=20
> I need to fix this to find the *real* problem.

Since gcc 4.8.0, it defaults to -gdwarf-4.  You must explicitly use
-gdwarf-2, if you want to debug with the version of gdb in base.

Alternatively, use the gdb port, or lldb.

-Dimitry


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