Date: Sat, 7 Jun 2014 10:14:15 -0600 From: Warner Losh <imp@bsdimp.com> To: Adrian Chadd <adrian@FreeBSD.org> Cc: "freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org>, Ian Lepore <ian@freebsd.org>, Olavi Kumpulainen <olavi.m.kumpulainen@gmail.com> Subject: Re: C++ exceptions in freebsd-arm doesn't seem to work Message-ID: <EEBA06F7-0CF1-4712-BA61-5951323B541B@bsdimp.com> In-Reply-To: <CAJ-VmomsNogAzk8j6ob8aA%2BmJeiO5TEF=FQnq=mNzsVPyt23xw@mail.gmail.com> References: <BEAC4CFB-EC4F-456D-8173-2E34CCE3A2C1@gmail.com> <1402156516.20883.154.camel@revolution.hippie.lan> <CAJ-VmomsNogAzk8j6ob8aA%2BmJeiO5TEF=FQnq=mNzsVPyt23xw@mail.gmail.com>
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--Apple-Mail=_A8C64F4F-6649-40EC-8046-066E4041FAA2 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=windows-1252 On Jun 7, 2014, at 10:07 AM, Adrian Chadd <adrian@FreeBSD.org> wrote: >> Sadly, all I can do is confirm what you say: C++ exceptions don't = work >> on ARM EABI, not with clang and not with gcc. The only combo that = works >> is gcc and OABI, but with that combo you lose hardware floating = point. >>=20 >> There are rumours that this may be fixed in clang 3.5, but we = apparently >> can't import 3.5 because it can't be bootstrapped using gcc 4.2. I >> haven't had time yet to learn how to build clang 3.5 out-of-tree to >> confirm that exceptions work there. >>=20 >=20 > If only we had a way to tell our build system to build the in-src-tree > compiler suite using an external compiler toolchain. That'd make those > problems go away. We do. It isn=92t perfect, and you=92d have to bootstrap either a new = gcc or a 3.4 clang first to do it though. The automation of the = bootstrapping isn=92t present, and is what I=92m working on=85 Of course, it doesn=92t solve all the problems, just means we have more = tools to deploy. 3.5 is also quite experimental as well. But there=92s been no real talk about the right path forward: just FUD = and hand wringing on the lists. We do need to have a real discussion = about this. Not the lame pot-shots that have happened to date: what = versions do we support upgrading from, what configurations, etc. If we = had that discussion, then we wouldn=92t even need what Adrian suggests. = We=92d just say you have to have FreeBSD 9.2 or newer with clang 3.3 (or = is it clang 3.4) to bootstrap, and if you want to use other tools, you = are on your own. This would break updating from 8.x, but that=92s likely = OK. Be we need to have this discussion. Warner --Apple-Mail=_A8C64F4F-6649-40EC-8046-066E4041FAA2 Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename=signature.asc Content-Type: application/pgp-signature; name=signature.asc Content-Description: Message signed with OpenPGP using GPGMail -----BEGIN PGP SIGNATURE----- Comment: GPGTools - https://gpgtools.org iQIcBAEBCgAGBQJTkzpXAAoJEGwc0Sh9sBEA7XoQALVPY/5QURxbiAmycyO7eegS oS2+szDbEwfnBifMdJcso7tVrv0O6du9qwehWW24RD+2cI4hiUfW3ji5xEYcNr02 mojjjXrCiicwYI0nnGYv1OkL8onlPLJI5N4m4rcMbflv8WqYhVxJGSFfZmpVYvwT JdSAfcyDvv4fvnRyrsNOMp/p3v/SMmUu0xNgxT76eHb3IhJcrKIVqENNqJ1kA7rN c06kzwiXNtoTdCeQs3kix5R3QDy9plTmrAf0Y+TLRRQtVWV+CooxZsfOz9joywV8 ZLOnrC0Lpu7Dd3f+6BO76h881arBDuauFIG1sRmtzb8C8U8hInLVLyVEOT6HgR0d tShzW2tYyY4F9cQEqXdbemqUyqKboEaT8eY2BNx4AW4tSW8qfJnm2QOOJsPkds9U oxBxWtldaq/CfJi3h6j31OahC0a1Nqa5eeUs0tN+9ELaB96jEwQtwrhWGtYucM9i YKTIH4m0vAgJ+so5nVLnPHBP9t6NbzKj6WoMons0BM7BwK+tiUMgAl5E9zWLgpjd GwMOjUd8JMcsC8t9t/HvuTucoGPqnYb+jLeiBYqgij+r1KwOHOksQwM9XBmBlJAO I7GNSFWvry512MpOtGwrvqNi1Zx52GUhIlLWW4MJofTzb2IGYhQaG5aU1x0V83g2 Kpr6ZdNhqlZltSMbdM4G =sSDP -----END PGP SIGNATURE----- --Apple-Mail=_A8C64F4F-6649-40EC-8046-066E4041FAA2--
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