Date: Sat, 12 Jan 2019 19:54:38 +0100 From: Dimitry Andric <dim@FreeBSD.org> To: Oliver Pinter <oliver.pinter@hardenedbsd.org> Cc: current@freebsd.org Subject: Re: dwarf2 today on 13-CURRENT Message-ID: <70C62120-8F26-4EE6-AAA5-EBDAF7F65ACE@FreeBSD.org> In-Reply-To: <CAPQ4ffsAZDdPyArrLAMRM-YTDYP_4Lz9HP=Ve=0UmyfFa4H5Qg@mail.gmail.com> References: <CAPQ4ffsAZDdPyArrLAMRM-YTDYP_4Lz9HP=Ve=0UmyfFa4H5Qg@mail.gmail.com>
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On 12 Jan 2019, at 19:40, Oliver Pinter <oliver.pinter@hardenedbsd.org> =
wrote:
> According the following comment in ${SRCTOP}/sys/conf/kern.mk:
>=20
> #
> # Add -gdwarf-2 when compiling -g. The default starting in clang v3.4
> # and gcc 4.8 is to generate DWARF version 4. However, our tools don't
> # cope well with DWARF 4, so force it to genereate DWARF2, which they
> # understand. Do this unconditionally as it is harmless when not =
needed,
> # but critical for these newer versions.
> #
> .if ${CFLAGS:M-g} !=3D "" && ${CFLAGS:M-gdwarf*} =3D=3D ""
> CFLAGS+=3D -gdwarf-2
> .endif
>=20
> this dwarf2 limitation still exists in today's HEAD?
>=20
> I mean the FreeBSD project switched to elftoolchain and mostly to LLVM
> tools. LLDB is compiled by default on 13-CURRENT (~ HEAD) and the kgdb
> has moved under the libexec directory, to hide them from the common
> usage.
See https://reviews.freebsd.org/D17930, where there is a proposed patch
for this very topic.
-Dimitry
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