[CMake] include directories not found for object library

[Robert Maynard]

This is scheduled to be fixed in the next release by allowing OBJECT
libraries to be used in target_link_libraries.



On Tue, May 8, 2018 at 7:46 PM Miklos Espak <espakm at gmail.com> wrote:

> Hi,
>
> I have an abstract class that I want to compile into many applications.
> Something like this:
>
> baseapp.h
> baseapp.cpp
> app1.h
> app1.cpp
> app2.h
> app2.cpp
> ...
>
> I thought of making an object library from baseapp because I want to
> compile it only once and it is used only internally.
>
> However, baseapp depends on other libraries, e.g. dcmjpeg, mylib1 and
> mylib2, and the include directories of these of these libraries are not
> found. For regular libraries and executables, the include directories are
> picked up from the target property of the linked libraries, but for object
> libraries you cannot specify target link libraries.
>
> I came up with this:
>
> add_library(baseapp OBJECT baseapp.h baseapp.cpp)
> target_include_directories(baseapp PUBLIC
>   $<TARGET_PROPERTY:dcmjpeg,INCLUDE_DIRECTORIES>
>   $<TARGET_PROPERTY:mylib1,INCLUDE_DIRECTORIES>
>   $<TARGET_PROPERTY:mylib2,INCLUDE_DIRECTORIES>)
>
> This works, but it does not look too pretty to me.
>
> I am wondering if there is a more elegant way.
>
> E.g. would it be a good idea to propagate the include dirs with the
> add_dependencies command? E.g. instead of the above, one could write:
>
> add_dependencies(baseapp dcmjpeg mylib1 mylib2)
>
> Cheers,
> Miklos
>
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