On Thu, Oct 29, 2009 at 4:01 PM, Satish Balay <balay at mcs.anl.gov> wrote:
> On Thu, 29 Oct 2009, Barry Smith wrote: > > > > > On Oct 29, 2009, at 3:52 PM, Lisandro Dalcin wrote: > > > > > On Thu, Oct 29, 2009 at 4:45 PM, Jed Brown <jed at 59a2.org> wrote: > > > > > > > > I realize that the real problem here was OpenCV's libml and the fact > > > > that linkers don't resolve symbols by starting with the most recent > -L > > > > path [*], but we should at least remember that putting > -L{PETSC_LIB_DIR} > > > > at the beginning of the line can completely change the way symbols > are > > > > resolved. > > > > > > > > > > I think that the real problem here is that developers should be > > > smarter and they should not use such short names for a library... "ml" > > > .. just two characters... What "ml" stand for? "mailing list"? the > > > internet country code for Mali at Africa? "milliliter" ? "Markup > > > Language", "ML" the programming language? Well... I'll stop here... > > > :-) > > > > > > IMHO, I think that what Jed suggested in previous mail about using > > > -Wl,-whole-archive ${PETSC_EXTERNAL_LIB} -Wl,-no-whole-archive when > > > --with-shared is in action could be a VERY good idea... Then PETSc > > > link lines will not need to refer at all to these static libs from > > > external packages... > > This works for folks who use PETSc - and nothing else. But once you > have 2 packages doing this [say both add in hypre symbols] - and then > some user wants to use these two packages - you have conflicts. [esp > with multiple copies of global variables etc..] > > The ideal solution is to have every library have its own .so > file.. [but this is not easy] > I am with Satish here. This smells like sticking pregenerated template stuff in libraries, which eventually gets heinous, and everyone always goes back to all headers. I am for keeping each package in its own libraries. Matt > Satish > -- What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead. -- Norbert Wiener -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-dev/attachments/20091029/5d58c8da/attachment.html>