Further searching has indeed suggested that boost 1.55 is still broken and will remain so (e.g. the bug #793222 discussion), and thus I can see that 1.57/1.58 is needed as you say. In fact 1.58 is available and it's actually just a couple of libreoffice dependencies specifically targeting 1.55 that are causing the hold up in upgrade installation currently (at least here on my systems).
It is indeed unfortunate that packages for the gcc5 transition were pushed to unstable before libreoffice was made ready for it, and worse that this has resulted in security implications for Sid users. I must request that those responsible please tread more carefully in future (no disrespect intended, and do I really appreciate the free time and effort put into these projects). While there may sadly be no specific commitment for keeping unstable secure, it has been my impression that the record for pushing security fixes there is pretty strong. I am sure that many Debian users run Sid in order to have a much more up to date collection of application packages than you get from stable (testing does not seem suitable for normal use, since security updates are frequently delayed due to unstable->testing transitions). It would be very much appreciated if devs/maintainers would please keep this in mind in order to not cause problems like this for such users. On Sat, 2015-08-08 at 00:35 +0200, Matthias Klose wrote: > Control: severity -1 important > > On 08/07/2015 09:11 PM, jnqnfe wrote: > > Control: severity -1 critical > > Control: tag -1 + security > > > > This dependency issue is now blocking installation of security > > updates > > on Sid (which many people use instead of stable, whether they > > should or > > not), specifically the emergency patch to iceweasel (CVE-2015-4495) > > in > > version 38.1.1esr-1. > > this is unfortunate, however there never was and is any commitment of > unstable > getting security fixes. The issue is not fixed by any upload of > boost1.55 built > with GCC 4.9, and it won't build with GCC 5. An update to 1.57 or > 1.58 is > required. If you need to have such an update in testing, then you > should ask > for an upload to testing. > > -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org