On Mon, Oct 29, 2012 at 4:36 PM, Alan W. Irwin <ir...@beluga.phys.uvic.ca> wrote: > On 2012-10-29 13:16-0400 David Cole wrote: > >> The bottom line is: we changed where the output files of an >> enable_language call go to make them >> "exact-version-of-CMake-specific". Anybody who was depending on the >> location of those files needs to update their own code accordingly. I >> think the number of people/projects affected by this should be quite >> small... Admittedly: for those that are affected (you, sorry), it's >> annoying, but it should be easy to apply the above type changes and >> have your custom language support files work for older and newer >> versions of CMake. >> >> Please let me know if this seems reasonable to you. > > > Hi Dave: > > You guys have a very good track record for keeping backwards compatibility, > but language support is a really special area with relatively few > groups adding language support externally (although it is clear more > groups than the PLplot group do this). Therefore, I completely > understand why you guys are tempted to go against your track record > and simply make this backwards incompatible change without adding any > complications to keep backwards compatibility. Also, from what you > have said it does seem straightforward (although I haven't tried it > yet) to modify a particular language's support so it works with the > new language support infrastructure as well as the old. > > How about this for a compromise? Add a note to your release notes > that announces this backwards incompatibility introduced into the > language support infrastructure for 2.8.10. That note should include > most of the contents of your e-mail to me about the practical steps > required for external project's language support to work both with old > and new language support infrastructure. Or, better yet, point to a > text file that is part of the 2.8.10 and future releases that contains > this essential information. > > Also _ideally_ you should check that those update instructions actually work > for the simple Ada project that you can easily obtain with > > svn checkout \ > https://plplot.svn.sourceforge.net/svnroot/plplot/branches/test_cmake/test_ada > > I will be applying your instructions to update our D language support > after lunch. If those work, I will follow up by doing the same thing > for Ada (if you don't beat me to it with a patch for how the simple > Ada project can be updated). Presumably I will be able to give you > feedback on your instructions by late this afternoon (evening your > time). At this point I am not actually completely convinced your > instructions will work since both D and Ada language support have been > around a long time and are not nearly as modernized as the core > language support that appears in CMake-2.8.9. With luck, that will > not be an issue for either D or Ada, but we will see. You > might want to consider delaying your release until you get feedback > from me on your instructions, but that decision is up to you. > > > Alan > __________________________ > Alan W. Irwin > > Astronomical research affiliation with Department of Physics and Astronomy, > University of Victoria (astrowww.phys.uvic.ca). > > Programming affiliations with the FreeEOS equation-of-state > implementation for stellar interiors (freeeos.sf.net); the Time > Ephemerides project (timeephem.sf.net); PLplot scientific plotting > software package (plplot.sf.net); the libLASi project > (unifont.org/lasi); the Loads of Linux Links project (loll.sf.net); > and the Linux Brochure Project (lbproject.sf.net). > __________________________ > > Linux-powered Science > __________________________
The release is delayed already... I'm not going to start building the final release until after I hear back from you. There are still several discussions going on around this issue. So.... do let me know your results. Thanks, David -- Powered by www.kitware.com Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Please keep messages on-topic and check the CMake FAQ at: http://www.cmake.org/Wiki/CMake_FAQ Follow this link to subscribe/unsubscribe: http://public.kitware.com/cgi-bin/mailman/listinfo/cmake-developers