[CMake] Super builds and export with Namespace

[Miller Henry]

I have a few different cmake based projects that depend on each other (as a tree, no circular dependencies).  Mostly this works great, but a few people have expressed interested in a superbuild which builds everything together for various purposes.  I can make this work with ExternalProject, but that isn't a useful solution for IDE users.  I'm trying to use add_subdirectory and running into a problem with namespaces in my export files

Currently projectA has
   EXPORT(projectA NameSpace ProjectA_)
Which works great, when projectB wants to link to a library in projectA it is just FIND_PACKAGE(ProjectA) then TARGET_LINK_LIBRARIES(lib ProjectA_LibraryName).  Simple enough without superbuilds.

When I get to a superbuild though I don't know how to handle this.  It is easy to do write some sort of FindProjectA.cmake or ProjectAConfig.cmake file to make the FIND_PACKAGE work in projectB. However I don't know how to get a ProjectA_LibraryName target that I can link to, the superbuild only knows about LibraryName without the namespace.

The only idea I can think of is in the superbuild have a bunch of ADD_LIBRARY (ProjectA_LibraryName ALIAS LibraryName) lines hard coded. This means I have to maintain that file though which I don't like. Does anyone have a better idea?


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