On Wed, Oct 28, 2009 at 7:08 PM, Tim Joseph Dumol <t...@timdumol.com> wrote: > As stated in http://trac.sagemath.org/sage_trac/ticket/7273, PIL has > dependencies on libtiff and libjpeg that can break the build. > > There are several options: > > (1) PIL can be crippled -- have libtiff and libjpeg disabled even if the > local system has them, > > (2) libtiff and libjpeg be included as standard libraries along with PIL, or > > (3) PIL, libtiff, and libjpeg be included as optional libraries.
There are 2 other options: (4) When building *binaries* for distribution, PIL does not link in libtiff and libjpeg, even if the build system has them. When users build Sage themselves, PIL will link in libtiff and libjpeg if the system has them, as it does now. (5) We modify PIL so it gracefully fails if libtiff and libjpeg are not available at runtime, instead of bombing out completely the moment it tries to do anything nontrivial. This is a bog standard thing to do, which is done in *most* Python libraries, and certainly often in Python itself. I'm surprised it isn't done in PIL already. Probably (4) is easier than (5), and would be a good temporary measure, which would allow us to put off (2). I would implement (2) via an environment variable that gets set before building a Sage for distribution. Doing (3) for libtiff and libjpeg is a no brainer. Post the packages to trac and get them refereed. I'm against deprecating PIL to the status of optional. Also, I agree with Marshall -- it would probably be wise at this point to get a handle on porting Sage to Cygwin before adding more and more new components to Sage. Every component has the potential to make porting work more difficult. I can't emphasize this too much. For example, I think Mike Hansen has spent a lot of time today frustrated with the Windows port because we use ECL to build Maxima now, and Maxima (and Fricas) both totally fail to build with ECL on Cygwin, though ECL itself seems to build fine. Amusingly, they fail with the most cryptic error I've ever seen: "no error" !. -- William > > Here are the new packages: > > libtiff: http://sage.math.washington.edu/home/timdumol/libtiff-3.9.1.p0.spkg > > libjpeg: http://sage.math.washington.edu/home/timdumol/libjpeg-7.p0.spkg > > PIL: http://sage.math.washington.edu/home/timdumol/pil-1.1.6.p1.spkg > > Links are also posted in the trac ticket. > > Can we have a vote on what to do? > > - Tim Joseph Dumol <tim (at) timdumol (dot) com> > > > > -- William Stein Associate Professor of Mathematics University of Washington http://wstein.org --~--~---------~--~----~------------~-------~--~----~ To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
