[CMake] OBJECT libraries and INTERFACE_SOURCES

[Giovanni Funchal]

Hi,

The help page [1] mentions that:

> Although object libraries may not be named directly in calls to the
> target_link_libraries() command, they can be “linked” indirectly by
> using an Interface Library whose INTERFACE_SOURCES target property
> is set to name $<TARGET_OBJECTS:objlib>.

However, I was unable to get this to work. Doing this:

add_library(lib-obj OBJECT test.cpp)
add_library(lib INTERFACE)
add_dependencies(lib lib-obj)
set_target_properties(lib PROPERTIES INTERFACE_SOURCES
$<TARGET_OBJECTS:lib-obj>)

And then trying to specify lib in link_libraries of an executable yields an
error message "Cannot find source file: ... Tried extensions:... ".

Am I doing something wrong?

Thanks,
-- Giovanni

[1]
https://cmake.org/cmake/help/v3.6/manual/cmake-buildsystem.7.html#object-libraries
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