[CMake] OBJECT Libraries and linking against targets

[Wesley Smith]

Hi,
I understand vaguely why OBJECT libraries can't link against other targets,
but I don't think the restriction in place needs to be so constrained.
Consider the following:

* A target is being create as an OBJECT library
* A number of other targets are defined as INTERFACE target where they only
set include paths, compiler options, etc.

How is it possible to communicate the dependencies expressed in an
INTERFACE target to an OBJECT library?  So far the only method I've found
that works is to use a handful of generator expressions, which seems like a
lot of work for something that would just work if I could "link" the
INTERFACE library against the OBJECT library.

Here's what I have to do:

target_compile_features(tgt PUBLIC
    $<TARGET_PROPERTY:tgt_dep,COMPILE_FEATURES>
)
target_include_directories(tgt PUBLIC
    $<TARGET_PROPERTY:tgt_dep,INCLUDE_DIRECTORIES>
)
target_compile_options(tgt PUBLIC
    $<TARGET_PROPERTY:tgt_dep,COMPILE_OPTIONS>
    $<TARGET_PROPERTY:tgt_dep,COMPILE_FLAGS>
)
target_compile_definitions(tgt PUBLIC
    $<TARGET_PROPERTY:tgt_dep,COMPILE_DEFINITIONS>
)

thanks!
wes
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