Add PIC static library for shared library building.

Author: pmai

CMakeLists.txt

@@ -6,4 +6,8 @@ PROTOBUF_GENERATE_CPP(PROTO_SRC PROTO_HEADER ${OSI_PROTO_FILES})
 add_library(open_simulation_interface STATIC ${PROTO_SRC} ${PROTO_HEADER})
 target_include_directories(open_simulation_interface PUBLIC ${PROTOBUF_INCLUDE_DIR})
 target_link_libraries(open_simulation_interface PUBLIC ${PROTOBUF_LIBRARY})
+add_library(open_simulation_interface_pic STATIC ${PROTO_SRC} ${PROTO_HEADER})
+set_property(TARGET open_simulation_interface_pic PROPERTY POSITION_INDEPENDENT_CODE ON)
+target_include_directories(open_simulation_interface_pic PUBLIC ${PROTOBUF_INCLUDE_DIR})
+target_link_libraries(open_simulation_interface_pic PUBLIC ${PROTOBUF_LIBRARY})
 set (OSI_PROTOBUF_INCLUDE_PATH ${CMAKE_CURRENT_BINARY_DIR} CACHE INTERNAL "[OSI] Path to generated protobuf files for the open simulation interface.")