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Date:      Fri, 28 Mar 2014 19:08:03 +0100
From:      Dimitry Andric <dim@FreeBSD.org>
To:        Craig Rodrigues <rodrigc@FreeBSD.org>
Cc:        Larry Baird <lab@maxwell.gta.com>, FreeBSD stable <freebsd-stable@freebsd.org>
Subject:   Re: HEADS UP: merged llvm/clang 3.4
Message-ID:  <2DAD7A95-E396-444A-B380-54259D27039D@FreeBSD.org>
In-Reply-To: <CAG=rPVdEaoQf0jwCAy3NNzUTVGQ8Gr6aTNc0N3mhHpuw_cZqaQ@mail.gmail.com>
References:  <20140328165121.13797.qmail@mailgate.gta.com> <6F2AEDEC-4173-45B0-9C21-1D80E33660F6@FreeBSD.org> <CAG=rPVdEaoQf0jwCAy3NNzUTVGQ8Gr6aTNc0N3mhHpuw_cZqaQ@mail.gmail.com>

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On 28 Mar 2014, at 19:03, Craig Rodrigues <rodrigc@FreeBSD.org> wrote:
> On Fri, Mar 28, 2014 at 10:51 AM, Dimitry Andric <dim@freebsd.org> =
wrote:
>> On 28 Mar 2014, at 17:51, Larry Baird <lab@maxwell.gta.com> wrote:
>> ...
>>> This GDB was configured as "i386-marcel-freebsd"...Dwarf Error: =
wrong version in compilation unit header (is 4, should be 2) [in module =
/usr2/lab/6.2/sw/src/hello]
>>=20
>> The default debug info format for clang 3.4 is now DWARF4, which gdb
>> from base cannot handle.  So please use gdb from ports, which is much
>> better anyway, or compile with -gdwarf-2.
>=20
> Is this also true for kernel debugging with kgdb?

Please read UPDATING, which mentions this.  Another MFC will be done
soon, which automagically sets -gdwarf-2 for kernel builds, until
somebody ports the kgdb extensions to e.g. lldb or ports gdb.

-Dimitry


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