soci provides CMake targets:

    find_package(soci CONFIG REQUIRED)
    target_link_libraries(main PRIVATE $<IF:$<TARGET_EXISTS:SOCI::soci_core>,SOCI::soci_core,SOCI::soci_core_static>)

    # Linking specific backends (enabled: @backends@)
    target_link_libraries(main PRIVATE $<IF:$<TARGET_EXISTS:SOCI::soci_<BACKEND>,SOCI::soci_<BACKEND>,SOCI::soci_<BACKEND>_static>)