Package dependency collision

I’m trying to add some conan packages to my cmake project namely opencv & boost. When I do so using the following two cmake function calls:

conan_cmake_run(REQUIRES opencv/4.3.0@channel/user
        BASIC_SETUP CMAKE_TARGETS
        BUILD missing
        PROFILE_AUTO ALL)
conan_cmake_run(REQUIRES boost/1.73.0@channel/user
        BASIC_SETUP CMAKE_TARGETS
        BUILD missing
        PROFILE_AUTO ALL)

I get an error in the second call that looks like this:

 add_library cannot create imported target "CONAN_LIB::zlib_z" because
  another target with the same name already exists.

It seems the problem is that both opencv & boost have a zlib dependency which is being added a second time in the setup of the boost package. It seems quite a common occurrence that multiple packages have a dependency for the same package. What is the recommend way to deal with this in cmake-conan?

[Timen]

thanks for the info! I think this is probably something to add to the Readme, I may open a pr for that later on once I have some more familiarity.

[Timen]

That would probably work as-well but seems less convenient I’ll just stick to either using:

conan_cmake_configure(REQUIRES opencv/4.3.0@channel/user
                                                             boost/1.73.0@channel/user 
                                            GENERATORS cmake_find_package_multi)

or

conan_cmake_configure(REQUIRES opencv/4.3.0@channel/user
                                            GENERATORS cmake_find_package_multi)

Depending on the build configuration.