Date: Tue, 1 Jun 2010 11:38:09 +0300 From: Kostik Belousov <kostikbel@gmail.com> To: Lawrence Stewart <lstewart@freebsd.org> Cc: Roman Divacky <rdivacky@freebsd.org>, "James R. Van Artsdalen" <james-freebsd-current@jrv.org>, current@freebsd.org Subject: Re: [TESTING]: ClangBSD branch needs testing before the import to HEAD Message-ID: <20100601083809.GF83316@deviant.kiev.zoral.com.ua> In-Reply-To: <4C04587E.70800@freebsd.org> References: <20100529130240.GA99732@freebsd.org> <20100530135859.GI83316@deviant.kiev.zoral.com.ua> <508DA8CE-749A-46B4-AF0B-392DB08CBBCD@samsco.org> <4C04456D.7080408@jrv.org> <4C04587E.70800@freebsd.org>
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--nQeUMoeVp7j9rzTQ Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Jun 01, 2010 at 10:46:54AM +1000, Lawrence Stewart wrote: > On 06/01/10 09:25, James R. Van Artsdalen wrote: > [snip interesting history] >=20 > >I do suggest modifying the FreeBSD build process so that uname -a shows > >the compiler and its version for both the kernel and userland. >=20 > Reading through this discussion, I wanted to draw attention to this=20 > footnote in James' email. It sounds like a sensible and useful=20 > suggestion that would go some way to addressing Kostik's concerns about= =20 > knowing whether a kernel bug report was related to a gcc or clang built= =20 > kernel. This is unsufficient. What could work is if clang provided some common symbol into all .o files generated by it, e.g. __clang_compiled. And then kernel considered tainted with corresponding banner printed when weak reference to that symbol is resolved to non-zero. This does not handle modules and does not cleanly handle usermode runtime (libc, libthr, rtld etc). I do not care about users busting their systems by using alternative compilers and/or mixed builds. I worry about wasting developers time chasing bugs that are not bugs in the FreeBSD system. As an example see low-visible thread about sig11 during buildworld. --nQeUMoeVp7j9rzTQ Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (FreeBSD) iEYEARECAAYFAkwExvEACgkQC3+MBN1Mb4jzLgCbBgpicmmSqKkO/tuDf9rHI4Qp NpkAoNx6X1W2AojXJUNVZn4wvzNvBflZ =Qky7 -----END PGP SIGNATURE----- --nQeUMoeVp7j9rzTQ--
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