Date: Thu, 18 Dec 2014 07:21:41 -0700 From: Warner Losh <imp@bsdimp.com> To: Dimitry Andric <dim@freebsd.org> Cc: FreeBSD ARM <freebsd-arm@freebsd.org>, FreeBSD-Current <freebsd-current@freebsd.org>, FreeBSD ports <freebsd-ports@freebsd.org>, NGie Cooper <yaneurabeya@gmail.com> Subject: Re: RFT: Please help testing the llvm/clang 3.5.0 import Message-ID: <A8483B90-1D9D-4D3F-952A-8FA467847745@bsdimp.com> In-Reply-To: <D9C5A8D1-2158-4B37-9C9C-067A4DDE6E44@FreeBSD.org> References: <8598B1D4-5485-426F-B6D6-22BF26AC5FE1@FreeBSD.org> <CAGHfRMBPkQiTgW0Eahkoe1QwArBst-BZ-Lawor_CDda1x8K9xg@mail.gmail.com> <D9C5A8D1-2158-4B37-9C9C-067A4DDE6E44@FreeBSD.org>
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--Apple-Mail=_EDB854E8-CC35-4A03-9A15-80A65063E49F Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 > On Dec 18, 2014, at 6:02 AM, Dimitry Andric <dim@freebsd.org> wrote: >=20 > On 18 Dec 2014, at 02:17, NGie Cooper <yaneurabeya@gmail.com> wrote: >>=20 >> On Fri, Nov 28, 2014 at 1:03 PM, Dimitry Andric <dim@freebsd.org> = wrote: > ... >> As a request to speed up the build process further, >> - Would it be [easily] possible in the clang35 branch to bootstrap >> the compiler for a specific architecture? The bootstrap / cross >> compiler for instance always builds N targets instead of building = just >> the desired TARGET/TARGET_ARCH combo. >=20 > It's not very easy, at least not without breaking various parts of our > fragile build system, but I surely want to put something like this on > the TODO list for *after* the import has completed. >=20 > The branch is making progress right now, and I would not want to > complicate matters further by introducing yet another tricky feature. = :) The build system isn=E2=80=99t so much the issue, but you wind up with files that refer to all the architectures. But this is a request for a new feature, not quite in scope for a = compiler upgrade. >> - Could a "MK_CLANG_ALL_TARGETS" or something similar option be >> added to src.opts.mk to fine tune this process for those of us who >> don't want to build a cross-compile toolchain every iteration for our >> target MACHINE/MACHINE_ARCH? >=20 > I would be fine with something like this, as long as it is turned off = by > default, or if it is only used for the bootstrap stages. It is = actually > an extremely useful feature of clang that you can target multiple > architectures with one compiler binary. This is a new feature. Various people have tried in the past to = implement it and compiling just the mips files on mips is straight forward. = However, convincing clang to not reference the other architectures requires more sophistication than we currently have in the clang build process. > A more interesting case would be to remodel the build system so it can > use one toolchain (external, or pkg-ng'd, maybe?) for building an = entire > universe. With clang, that should be relatively easy to do. Another useful new feature. The hard part with this is getting all the = fiddly bits in the tree that depend on default CC producing proper binaries to cooperate.. Doable, but that=E2=80=99s a lot of universe builds. And = today it isn=E2=80=99t very practical because sparc64 and mips are broken... Warner --Apple-Mail=_EDB854E8-CC35-4A03-9A15-80A65063E49F 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 iQIcBAEBCgAGBQJUkuL1AAoJEGwc0Sh9sBEAjZ8QAI6iBNKPSQmhd9pG/LFGfztN cnlt5SdJgHCYuVqncB0/R7yIQiU2xm+kjXemXbd08lUqiXhcxdUQAeusNgVkw3pF BR0kviv0qmWjbtdBkWRjVKbGdfGkk7lJZhKrFzSxEJNrL4/7cm3pvf4jGgX0UNl0 JiL7CQNl5tmeQMsKcy09SzI9MNXFxbhHiKD5majqgx4sFsguqNzZRwnh78Cez8GM CMgVkRfGEY0FG49a+2iUDbq1/J7+tMTew8HpE5wgMsXlnYwi4jjTeZnpnoaq4IEa u4kIedMMbNoGyUTuM5wWN7XUe4RtOWqbye6ZEdtIn7LIPQFkWXU0Wj2nCxjsiMYt Kn+HJRhM2IaJA3RkYJW9o49Ek7841ZbG0zkUBFsRIM0UZstItZnUbUmHBqXG1pcB JSOj+k/Obrn1aXa7va4XQidNwtGi03EHuDJTTk7KqpAwiHb4aqFmPTXzKpKNR37G DZLQKZ32OWAqyr80pKrn33jj9mzq7CYAU8c6SvOWUkL2+W5dn5b5P7evvzmrglsX noRNiiHmRJiDdn1HJemUVWyLlTyHbgm1DtMu/Dc/k40a3pRAv2kAYVNcZ0HpcyP3 sPKI3zeariL5x+bssleP0lUyJNKZcsyr1F9BlLhO2u+hOFbmjHucQgqekuQ/UOpv /teGdffq8+qwuBVpJCFO =7moE -----END PGP SIGNATURE----- --Apple-Mail=_EDB854E8-CC35-4A03-9A15-80A65063E49F--
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