On Fri, Dec 03, 2010 at 11:11:18AM +0000, Roger Leigh wrote: > On Fri, Dec 03, 2010 at 11:27:44AM +0100, Joachim Wiedorn wrote: > > Lucas Nussbaum <lu...@lucas-nussbaum.net> wrote on 2010-12-03 10:36: > > > > > No, sorry. I must admit that I didn't spend any time investigating the > > > failures. However, my irssi backlog says the two major changes in Ubuntu > > > that could cause failures are: > > > - --as-needed is now used by default by the linker > > > - python2.7 > > > > Many packages (e.g. xfe, xfce-*) fails with > > "[LD_ERROR] ...: could not read symbols: Invalid operation" > > > > I know that the Xfe package fails because Ubuntu use: > > "-Bsymbolic-functions" by default by the linker. > > > > The reasons for the problems are redefinitions of some library functions > > in the package. See: > > https://bugs.launchpad.net/ubuntu/+source/xfe/+bug/644645 > > > > Unfortunately I don't know any workaround. All upstreams ought to rewrite > > many parts of the source code to work with this default linker config. > > So you're saying Ubuntu is using -Bsymbolic* *by default*? > > If so, that's even more retarded than their recent decision to > enable -Wl,--as-needed by default, and that was a really bad decision > by itself. -Bsymbolic breaks most of the advantages of ELF, since it > prevents LD_PRELOAD and hides things from the global symbol namespace, > even duplicating global stuff so you get bizarre and broken program > behaviour, as you're seeing here...
It doesn't prevent LD_PRELOAD. It does prevent intra-library calls to be rerouted to another library, but it doesn't prevent inter-libraries calls to be rerouted. > http://software.intel.com/en-us/articles/performance-tools-for-software-developers-bsymbolic-can-cause-dangerous-side-effects/ ... which is biased, as perfectly said in the comment. But I do agree that a -Bsymbolic default is dangerous. Upstream may want to use them at their will, but this shouldn't be enforced by the toolchain. Mike -- To UNSUBSCRIBE, email to debian-devel-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/20101203112843.ga4...@glandium.org
