Brad, Thanks for the detailed response. This all makes a lot of sense. I’ll have to stew on this a bit and see where it leads me. In general it sounds to me like there is no easy solution here.
Thanks, -Chris > On Jun 21, 2016, at 1:05 PM, Brad King <brad.k...@kitware.com> wrote: > > On 06/21/2016 02:18 PM, Chris Bieneman wrote: >> Our current solution to work with this tool in CMake > > For reference, a quick look at LLVM's `cmake/modules/TableGen.cmake` > indicates that the current solution is based on add_custom_command. > >> The harder part is that our DSL supports C-like includes. > > The add_custom_command signature has an IMPLICIT_DEPENDS option > for this, but it only works for Makefile generators. > >> Our DSL compiler can generate .d files, but hooking that up to >> CMake is a harder problem. > > With some work it may be possible to teach our Ninja generator how > to consume .d files in custom commands. Perhaps such support could > even be extended to the Makefile generators instead of using our > approximate scanning implementation. > > In general implicit dependencies cannot be cleanly supported by > the Visual Studio or Xcode generators. Those environments provide > no hooks for custom build-time dependency scanning. At best one > can have the custom command produce a file as a side effect that > can be consumed by CMake on the next run. This would work for > all generators but causes lots of CMake re-runs. > >> My thought was to try and treat TableGen as a language. >> There are some complications with that because we don’t >> actually have a compiler for it at configuration time. > > I don't think that is a good approach both because we won't > be able to enable the language without the compiler already > existing and because custom languages do not work well in > the IDE generators (and will have the same dependency scanning > problems as above). See above approaches instead. > > -Brad > -- Powered by www.kitware.com Please keep messages on-topic and check the CMake FAQ at: http://www.cmake.org/Wiki/CMake_FAQ Kitware offers various services to support the CMake community. For more information on each offering, please visit: CMake Support: http://cmake.org/cmake/help/support.html CMake Consulting: http://cmake.org/cmake/help/consulting.html CMake Training Courses: http://cmake.org/cmake/help/training.html Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Follow this link to subscribe/unsubscribe: http://public.kitware.com/mailman/listinfo/cmake-developers
