Date: Mon, 7 Mar 2016 11:50:53 -0700 From: Warner Losh <imp@bsdimp.com> To: Dimitry Andric <dim@freebsd.org> Cc: src-committers <src-committers@freebsd.org>, "svn-src-all@freebsd.org" <svn-src-all@freebsd.org>, "svn-src-head@freebsd.org" <svn-src-head@freebsd.org> Subject: Re: svn commit: r296428 - head/sys/boot/common Message-ID: <10F1E4F3-BE8A-4BC3-AFC3-FB4C3A729B60@bsdimp.com> In-Reply-To: <C6FFFB5D-EAE1-4BFA-90EC-6AE2DF67A921@FreeBSD.org> References: <201603061557.u26FvhMi033982@repo.freebsd.org> <56DCD52F.4010709@freebsd.org> <AC0A9708-B618-4D05-8532-BD451AB94A60@FreeBSD.org> <1457365187.13785.174.camel@freebsd.org> <20160307155217.GJ67250@kib.kiev.ua> <CANCZdforb7gAanu4Hys6b2NmhOGVGn7UutsUqav5gGUsqSTMxA@mail.gmail.com> <C6FFFB5D-EAE1-4BFA-90EC-6AE2DF67A921@FreeBSD.org>
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--Apple-Mail=_0F3D2FDE-B021-4B5D-A595-A66AF3B5A464 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 > On Mar 7, 2016, at 10:41 AM, Dimitry Andric <dim@freebsd.org> wrote: >=20 > On 07 Mar 2016, at 17:28, Warner Losh <imp@bsdimp.com> wrote: > ... >> Alternatively, is there a switch to clang 3.8 that says 'Don't = generate the new >> relocation, use the old one instead" which would also be safe and = allow a >> less-bumpy transition? >=20 > On amd64, we actually compile source files for the kernel with > -fno-asynchronous-unwind-tables, which is the flag that ensures object > files do not end up with a .eh_frame section, because the compiler = will > refrain from inserting CFI directives into the assembler. Excellent. > However, this only affects C source files, and we have a number of > hand-written assembler sources in the tree, with CFI directives in = them. > These will always result in .eh_frame sections, unless there is = another > assembler-specific flag of suppressing that. what are the odds of fixing this? Since the vast majority of assembler = code is going to be in the base kernel. The AESNI stuff is the only exception that I can think of=E2=80=A6 Are the CFI directives so that DTRACE works, or is there some other = reason? Warner --Apple-Mail=_0F3D2FDE-B021-4B5D-A595-A66AF3B5A464 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 iQIcBAEBCgAGBQJW3c2NAAoJEGwc0Sh9sBEAUqwP/1SksK5IiSg25Ui0EpcLfOXs C2j33VzFUxTCnPMERgPW+gs5dHHE8MnMWl2LgDGmPeVtTn9R27wjqliOK1z6laOk DkCvveuvQrodaO43ZcBgqWnkyq4feRAMCq0KDVPG+LDFI++7i8Lhfi+WbmGL+q09 l0AnYMLy7nbQD7zqbIg235MyWxf4fuByrw+jWcGje+LrB/P1TgrwtRkOAuGQX7eh ihxYarEd7XF0+H9r5Byk5aXR33XyKIbJQCIAk7Vismom3YkPhHvPSuDGNpkrBf5L T0KhBNdPF/9x5sQUBOIZ4lMxKEnGoUQPgKvAolJxuDZdMUlHfUYQ+QS9uoAQVD8t ySwd8GO/ngqPk0GmzzDwhGiR9hH3ugbhChkxin70jcCf7mZia0ARvFTlgeTbrl1I MLiKJMm5yUTkhGa5CSXWB9/cH1cBTHHNWksjInZ+KXFjgNBTulzWrA+klSaNMjkH gi2Or/hyMrXX0os8zwJI8SAMuQzfPuBHbRnjhHhcKhrpar/QSa9MIR1201/bF7yN 5Nv4dlCTS+6eXsMBH13PnDtF1CESUiMUBZsJX9gNgqQvHqEwqTig3DhyBHR4yytB rJukKlw/1fczz7wxKDKrS416NxdD1iJ0klGpLYlykNxQb3M41menBps7WGYDMTsM p2SBhZEy8AS2ohgC9D5g =kUVS -----END PGP SIGNATURE----- --Apple-Mail=_0F3D2FDE-B021-4B5D-A595-A66AF3B5A464--
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