[CMake] Install interface

[Robert Maynard]

Installing interface libraries has no effect without the 'EXPORT'
keyword as they have no artifacts, you will need to install the actual
archives to get any artifacts.

To generate a CMake file containing the correct import targets for
consumers of your project you should like at the 'EXPORT' keyword for
the install command (
https://cmake.org/cmake/help/latest/command/install.html#export )
On Sat, Aug 4, 2018 at 7:13 AM Quaquaraquà <nuquaquaraqua at gmail.com> wrote:
>
> Good morning,
> given the following configuration:
>
> /CMakeLists.txt
> /include/
> /lib1/CMakeLists.txt
> /lib2/CMakeLists.txt
> ...
>
> where each /lib.*/CMakeLists.txt creates its own archive:
>
> add_library(lib.* EXCLUDE_FROM_ALL
>     foo.cpp
>     bar.cpp
> )
> target_link_libraries(lib1 PUBLIC interface)
>
> and the final /CMakeLists.txt should wrap all libraries together::
>
> add_library(interface INTERFACE)
> target_include_directories(interface INTERFACE include/)
> add_subdirectory(lib1 lib2 ...)
> add_library(libcommon INTERFACE)
> target_link_libraries(libcommon INTERFACE lib1 lib2 ...)
>
> I wonder how to create an install target for the final library `libcommon' ?
> This snippet doesn't seem effective with INTERFACE targets:
> install(TARGETS libcommon
>     RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
>     ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
>     LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
> )
>
> Thanks,
> Quack
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