Date: Fri, 4 Jul 2014 11:18:31 -0700 From: David Wolfskill <david@catwhisker.org> To: Hans Petter Selasky <hps@selasky.org> Cc: stable@freebsd.org, "current@freebsd.org" <current@freebsd.org> Subject: Re: [HEADS-UP] Problem with clang in 9-stable [was: r268244 (stable/9) seems to break "sysctl hw.ncpu"] Message-ID: <20140704181831.GV6056@albert.catwhisker.org> In-Reply-To: <53B6EDD1.8030506@selasky.org> References: <20140704123901.GR6056@albert.catwhisker.org> <53B6E218.5070009@selasky.org> <20140704174705.GS6056@albert.catwhisker.org> <53B6EDD1.8030506@selasky.org>
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--AEkhIf3vy/ReXTu0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Fri, Jul 04, 2014 at 08:09:21PM +0200, Hans Petter Selasky wrote: > Hi, >=20 > Can you try to reproduce this: >=20 > Checkout 9-stable's src/sbin/sysctl only. >=20 > cd /usr/9-stable/src/sbin/sysctl >=20 > env CC=3Dclang make clean all > ./sysctl -n hw.ncpu >=20 > Then: >=20 > env CC=3Dgcc make clean all > ./sysctl -n hw.ncpu >=20 >=20 > clang --version > FreeBSD clang version 3.2 (tags/RELEASE_32/final 170710) 20121221 > Target: x86_64-unknown-freebsd9.1 > Thread model: posix >=20 > gcc --version > gcc (GCC) 4.2.1 20070831 patched [FreeBSD] > Copyright (C) 2007 Free Software Foundation, Inc. > .... Hmm... I should have mentioned this part earlier (sorry!): I've been using clang as the system compiler since about ... autumn 2012 (long ago enough that I forgot that it might be "odd" for stable/9). > When compiling the code with clang, no output is happening. When=20 > compiling with gcc, the FreeBSD 9-stable sysctl operates correctly. How= =20 > do we proceed? >=20 > Can more people check this and reproduce? Well, here's what I see: g1-252(9.3-P)[22] svn co file:///svn/freebsd/src/base/stable/9/sbin/sysctl A sysctl/sysctl.c A sysctl/sysctl.8 A sysctl/Makefile U sysctl Checked out revision 268249. g1-252(9.3-P)[23] cd sysctl/ g1-252(9.3-P)[24] env CC=3Dclang make clean all rm -f sysctl sysctl.o sysctl.8.gz sysctl.8.cat.gz Warning: Object directory not changed from original /tmp/hps/sysctl clang -O2 -pipe -std=3Dgnu99 -Qunused-arguments -fstack-protector -Wsyste= m-headers -Werror -Wall -Wno-format-y2k -W -Wno-unused-parameter -Wstrict-p= rototypes -Wmissing-prototypes -Wpointer-arith -Wno-uninitialized -Wno-poin= ter-sign -Wno-empty-body -Wno-string-plus-int -Wno-unused-const-variable -W= no-tautological-compare -Wno-unused-value -Wno-parentheses-equality -Wno-un= used-function -Wno-enum-conversion -c sysctl.c clang -O2 -pipe -std=3Dgnu99 -Qunused-arguments -fstack-protector -Wsyste= m-headers -Werror -Wall -Wno-format-y2k -W -Wno-unused-parameter -Wstrict-p= rototypes -Wmissing-prototypes -Wpointer-arith -Wno-uninitialized -Wno-poin= ter-sign -Wno-empty-body -Wno-string-plus-int -Wno-unused-const-variable -W= no-tautological-compare -Wno-unused-value -Wno-parentheses-equality -Wno-un= used-function -Wno-enum-conversion -o sysctl sysctl.o=20 gzip -cn sysctl.8 > sysctl.8.gz g1-252(9.3-P)[25] ./sysctl -n hw.ncpu g1-252(9.3-P)[26] env CC=3Dgcc make clean all rm -f sysctl sysctl.o sysctl.8.gz sysctl.8.cat.gz Warning: Object directory not changed from original /tmp/hps/sysctl clang -O2 -pipe -std=3Dgnu99 -Qunused-arguments -fstack-protector -Wsyste= m-headers -Werror -Wall -Wno-format-y2k -W -Wno-unused-parameter -Wstrict-p= rototypes -Wmissing-prototypes -Wpointer-arith -Wno-uninitialized -Wno-poin= ter-sign -Wno-empty-body -Wno-string-plus-int -Wno-unused-const-variable -W= no-tautological-compare -Wno-unused-value -Wno-parentheses-equality -Wno-un= used-function -Wno-enum-conversion -c sysctl.c clang -O2 -pipe -std=3Dgnu99 -Qunused-arguments -fstack-protector -Wsyste= m-headers -Werror -Wall -Wno-format-y2k -W -Wno-unused-parameter -Wstrict-p= rototypes -Wmissing-prototypes -Wpointer-arith -Wno-uninitialized -Wno-poin= ter-sign -Wno-empty-body -Wno-string-plus-int -Wno-unused-const-variable -W= no-tautological-compare -Wno-unused-value -Wno-parentheses-equality -Wno-un= used-function -Wno-enum-conversion -o sysctl sysctl.o=20 gzip -cn sysctl.8 > sysctl.8.gz g1-252(9.3-P)[27] ./sysctl -n hw.ncpu g1-252(9.3-P)[28]=20 > When compiling the -10 and -11 version of sysctl with clang and gcc,=20 > everything is fine! That's moderately seriously kinky.... And not in a Good Way. :-/ > Thank you! At least I have some evidence that I might not be merely hallucinating.... Peace, david --=20 David H. Wolfskill david@catwhisker.org Taliban: Evil cowards with guns afraid of truth from a 14-year old girl. See http://www.catwhisker.org/~david/publickey.gpg for my public key. --AEkhIf3vy/ReXTu0 Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQJ8BAEBCgBmBQJTtu/1XxSAAAAAAC4AKGlzc3Vlci1mcHJAbm90YXRpb25zLm9w ZW5wZ3AuZmlmdGhob3JzZW1hbi5uZXQ4RThEMDY4QTIxMjc1MDZFRDIzODYzRTc4 QTY3RjlDOERFRjQxOTNCAAoJEIpn+cje9Bk7seQP/0e5UCLxIMOv8ugkmuCU6yq/ uxvw/PI62hTyAnZS+97XwlQZcSqxoh33cruzyg6wfsOb8KKhjOE22n29C7Ewa+M7 cXlMDWOTgMdkoicojnf5N1jyZyoAGgtc0MOhh0kw4gcNZWYXwSGkuYlhZf1AkMq4 IZ+hqgSjm5zXpa+KacSmrE05uW06jYrRqq2DvN/oSm0+JhGjKs9CLfR2dl3QgYl9 8tUWHVRwdwpWB66fwSwn/i+saSoKSgqxI+EZzUxj6y8y4Zxfo+ESNemVE/VU7t+v L5REjVfzVdN+EaQcJsmrCjO2DI+vdJ/Ad9X0hdhqJanK1lsGWGeSYN+ZPNTfqPu9 EaJG2q8HCiT9qwU9j9jKk3odf/9ootOUbK/CS0EY3A3zDbuRI3Fh5gxKsGtQL9+8 1mv4VOdTp80XKUiVFj8rXv6doeS/Wt2eiKeSHL2AXFXPBm4PjbnHVrDYTzB8MuKS yC69q2YrTRJJaVZ1rZcRKN0EPZ/u+4Btj1HZZc6n2fEMlBzxWqS4iATrRp4zzcRL Uq+LLVv51FX2qeDkuhTYUFGvfNb/ZZe0gblLbWn/Y1Ujl7vaye6JIxiF4YN0AgOS DiCl6zA9MsQzutIjGisP326m5j0L1VZm146CYT7QyxqRn8s+Fbh2aeHmxj5f/2xp ZwNMBb1lnBF4x6mV5F8U =co+H -----END PGP SIGNATURE----- --AEkhIf3vy/ReXTu0--
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