On 30 November 2015 at 18:35, Brad King <brad.k...@kitware.com> wrote: > On 11/30/2015 01:32 PM, Dan Liew wrote: >> It works but only for makefile generators... That's an annoying >> limitation. I'll file a feature request to get this implemented for >> other generators. > > It happens to work for Makefile generators because it was easy to > implement since those generators already do their own scanning. > For other generators it is not possible to implement.
Well I found the open issue [1]. It's been open for a while. It doesn't look completely impossible. For Ninja, it looks like it has some support for compiler generated dependency files [2]. Incorporating that into ``add_custom_command()`` would require an extra call to the host compiler to generate the dependencies when the custom command is invoked. For other generators that are Makefile or Ninja based I guess that approach wouldn't work. There is an alternative which I suggested in the post. Have CMake determine the dependencies of the files passed to ``IMPLICIT_DEPENDS`` at configure time and spit that into the build files of the generator (that would work for any generator). Then have any changes made to the files passed to ``IMPLICIT_DEPENDS`` trigger a reconfigure so that the dependencies can be recomputed. For Makefiles you can don't need to do this and can take the "fast path" instead. [1] https://cmake.org/Bug/view.php?id=13234 [2] https://ninja-build.org/manual.html#_depfile Dan. -- 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
