try using extern template

src/c_wrapper/command_queue.cpp

src/c_wrapper/command_queue.h

src/c_wrapper/context.cpp

src/c_wrapper/context.h

src/c_wrapper/device.cpp

src/c_wrapper/device.h

src/c_wrapper/event.cpp

src/c_wrapper/event.h

src/c_wrapper/kernel.cpp

src/c_wrapper/kernel.h

src/c_wrapper/memory_map.cpp

src/c_wrapper/memory_map.h

src/c_wrapper/memory_object.cpp

src/c_wrapper/memory_object.h

src/c_wrapper/platform.cpp

src/c_wrapper/platform.h

src/c_wrapper/program.cpp

src/c_wrapper/program.h

src/c_wrapper/sampler.cpp

src/c_wrapper/sampler.h