I've been building lots of stuff inside Sage which gets nailed together in various ways. Keeping includes and libraries straight when many libraries are duplicated in Ubuntu has been necessary lately.
Most recently, I have found 2 specific problems and perhaps something more general to consider. I wanted to ask here first because there may be a reason for this First, libpng12.so is the same version as libpng.so in the current ubuntu distro but there is no symbolic link which maps libpng.so to libpng12.so. Building certain packages (VTK for example) gets a little confused having found the header files in sage but by default only finds libpng in /usr/lib I've put a sym-link in sage and it appears OK. Second, is zlib. Again, the versions are the same and in this case the symlinks exist... However, some programs which use zlib don't work properly, in particular git. Git complains: tar...@puget:$ git st git: /home/tarbox/projects/sage/sage-4.1/local/lib/libz.so.1: no version information available (required by git) This one has me a bit boggled... I looked at the docs and there doesn't appear to be a switch which turns on versioning... and the numbering scheme using symlinks is identical. So, this is just weird. More generally, when building larger packages (Qt, VTK) its non- trivial to adjust makefiles... makefiles are generated by other systems. I've been able to add the include path and all "seems" ok but I'll do more testing. However, I noticed that sage sets the environment variable LIBRARY_PATH which is a gcc variable. OTOH, it doesn't set CPATH or C_INCLUDE_PATH or CPLUS_INCLUDE_PATH. This seems inconsistent. LD_LIBRARY_PATH is set, as it would need to be, but that is for ld and I'm not sure that gcc uses it and I've had problems although many of the build systems do take a look and try various "tricks" to help out. Sometimes this helping causes very subtle problems. If there is a reason for this, cool I'd just like to know the logic. If its something which should be looked into / fixed, I'll enter a bug / enhancement into trac. -glenn --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to sage-devel-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
