[CMake] Duplicating a shared library and replacing target link libraries

[Chuck Atkins]

>
> The library linking against "originalLibraryForward" has to be
> compiled from the original sources too. Actually performing the

linking step should be sufficient. Is there a way to accomplish that?
>

Object libraries are what you need here.  See
https://cmake.org/cmake/help/v3.7/manual/cmake-buildsystem.7.html#object-libraries
.  Essentially you'll do something like this:

add_library(fooObj OBJECT ${foo_Common_Sources})
add_library(foo     $<TARGET_OBJECTS:fooObj> ${foo_RealOnly_Sources})
add_library(fooMock $<TARGET_OBJECTS:fooObj> ${foo_MockOnly_Sources})


The function does not work when the library passed to
> AddMockedLibrary() uses target_link_libraries() with IMPORTED targets
> from, e. g. calls to find_package(). In order to make creating the
> _MOCK-Library work I have to duplicate the original call to
> find_package() before calling AddMockedLibrary(). Is there a way to
> automate this as well?
>

You might be able to go down the route of creating an INTERFACE library
with all of the common properties necessary for both the actual and mock
libraries.  You could then add the interface lib as a public dependency
with target_link_libraries(foo PUBLIC fooInterface) and
target_link_libraries(fooMock PUBLIC fooInterface).  It's a bit convoluted
but I think it could work well here for you.

- Chuck
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