On Tue, Nov 15, 2011 at 10:52 PM, Bill Janssen <bill.jans...@gmail.com> wrote: >> > Again, installing libjpeg.dylib and/or libpng.dylib into $SAGE_LOCAL/ >> > lib has bad side effects on OS X, due to the use of DYLD_LIBRARY_PATH >> > in the Sage framework overall. So, maybe make it an optional spkg, >> > but having it as a required or standard spkg would be bad. >> >> We already install libpng.dylib standard in all copies of Sage on OS >> X. There were issues, but they got sorted out a while ago. >> >> -- William > > The reason this works on OS X is that the Sage version of the library > is called libpng12.dylib, while the system version is libpng.dylib. > This numbering is now built-in to libpng, but not to the jpeg > libraries, so the same process won't protect you. > > Basically, you can't safely override the library names you find in > /System/Library/Frameworks/ApplicationServices.framework/Versions/A/ > Frameworks/ImageIO.framework/Resources/, which are libjp2.dylib, > libjpeg.dylib, libopenexr.dylib, libpng.dylib, libradience.dylib, > libtiff.dylib, and libgif.dylib. By "override", I mean have libraries > with the same name (differing only in case) prior to these libraries > on the DYLD_LIBRARY_PATH. The version of libpng in /System is 1.4.3 > on both my Leopard system and my Lion system. The version in > sage-4.7.2 is 1.2.35. But the library name is different, so there's > no problem.
If all that is the case, why don't you name the jpeg library libjpegsage.dylib or something, and slightly change the PIL build script. > > -- > 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 > -- William Stein 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
