Date: Thu, 29 Aug 2013 10:14:27 -0600 From: Eric Blake <eblake@redhat.com> Cc: svn-src-head@freebsd.org, libvir-list <libvir-list@redhat.com>, Jason Helfman <jgh@freebsd.org> Subject: Re: [libvirt] FreeBSD, no gcc present libvirt build issue Message-ID: <521F7363.3080804@redhat.com> In-Reply-To: <521F6E54.1070104@redhat.com> References: <CAMuy=%2BiG20hs9b%2BD210=TZ50weyaJoPK8NZ8Mgea8s1A2UDQhw@mail.gmail.com> <521F63F4.4020406@redhat.com> <CAMuy=%2BhO15c_0EdjnMQMtL5OGESfQkkvjZ5oUwRGv2%2B0VB6U0w@mail.gmail.com> <CAMuy=%2BhgHARZyAUgiVaf0hdOSpTQOGRubucCY%2BQ6-kzDN8a5Ng@mail.gmail.com> <521F6C0F.9060007@redhat.com> <521F6E54.1070104@redhat.com>
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[-- Attachment #1 --] On 08/29/2013 09:52 AM, Eric Blake wrote: >>> >>> #define RAND_MAX 0x7ffffffd >> >> Huh? Why is this not 2**n-1? That violates assumptions we have made, >> and is WHY your compile failed. It has nothing to do with clang vs. gcc >> (both compilers would fail), it has to do with your changed system >> header resulting in violating assumptions that hold in ALL OTHER >> IMPLEMENTATIONS, that random numbers are evenly distributed within a >> range of a power of 2. >> > > http://lists.freebsd.org/pipermail/svn-src-head/2013-July/049076.html > > makes it look like the reduction in range was _intentional_? Yuck. A > non-power-of-2 random generator adds needless complexity to the user. > > > I also intend to open a bug against POSIX to request that RAND_MAX be > required to be 2**n-1, rather than relying on the assumption that > everyone so far, until FreeBSD 10, has happened to meet that requirement. http://austingroupbugs.net/view.php?id=743 -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.14 (GNU/Linux) Comment: Public key at http://people.redhat.com/eblake/eblake.gpg Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQEcBAEBCAAGBQJSH3NjAAoJEKeha0olJ0Nqz1gIAKiIF3hO4U9zqq2kpdsfQyFM XzYK0/FrPlQpszBjf0XZ6EiIFfEXUMjY8GB+PvxVN7Nl5ImuzQRuT7HH8b91U4XS bsHKrvtHpqGGiuX1rf1Yk762dRlDqVu+LG0Wmuxy13Jd4IoRaCkZNK9ZdyTamNSp DFSg0tqdIVfNifCFdTzLrBn6OlE+NdfAU+FOS/TMEZcGBmslaYAPbuqiZhvxIdTB 8KcrujuNkhknKtEuheaQj1he3eDCtliohIGiqbwo/Obbq4WqzoAdQY2CmSGv/NvN 0/kNznxFpY4EAcEA5q0JQGzdTP4KdfXiEP7kP3RThNMOhI6q+5sjAJ8rG5D9nyw= =WX7j -----END PGP SIGNATURE-----home | help
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