[cmake-developers] Exported targets with imported dependencies in CMake 3.0

[Jean-Christophe Fillion-Robin]

.. and whenever possible the FindXXX.cmake should defined imported targets.

Jc


On Thu, Mar 6, 2014 at 9:38 AM, Philipp Möller <bootsarehax at gmail.com>wrote:

> Stephen Kelly <steveire at gmail.com> writes:
>
> > Philipp Möller wrote:
> >> It would be great, if I could export imported targets and if CMake could
> >> walk the dependency tree automatically and import those targets on an
> >> as-needed basis.
> >
> > Part of the problem is that the place where you import your dependent
> > targets from (and the locations calculated) are not necessarily the same
> for
> > your downstreams.
>
> I understand the issue and have been fighting it in versions prior 3.0
> as well. It also arises if you simply export targets that have been
> target_link_librarie'd against full library paths returned by a
> find_package.
>
> That's why I thought some build-in functionality could be helpful for
> this, e.g. exporting and imported target would lead to a definition in
> the exports file that automatically triggers a corresponding
> find_package call.
>
> > You export your targets to and -exports file, and presumably you import
> that
> > in a -config file. In the same config file, you should add code to find
> your
> > dependencies too.
> >
> >
> http://www.cmake.org/cmake/help/v3.0/manual/cmake-packages.7.html#creating-packages
> >
> > The find_dependency macro can help with forwarding some find_package
> > arguments.
> >
> >
> http://www.cmake.org/cmake/help/v3.0/module/CMakeFindDependencyMacro.html
>
> The documentation is a little sparse, but I think I understand the
> purpose. I still need to traverse IMPORTED_LINK_INTERFACE_LIBRARIES and
> figure out which of the list members constitutes a target that needs to
> trigger a find_dependency and what a full library path is, correct?
>
> I can also not rely on a find_package call to actually produce imported
> targets and need to ship the code that turns the results of find_package
> in targets.
>
> Thanks for your help,
> Philipp
>
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