cmake CMAKE_SHARED_LINKER_FLAGS_INIT examples

cnjinhao/nana build/cmake/shared_libs.cmake :20 

set_target_properties (nana   PROPERTIES
                    OUTPUT_NAME         nana
                    ARCHIVE_OUTPUT_NAME nana
                    LINK_FLAGS "${CMAKE_SHARED_LINKER_FLAGS_INIT} -Wl,--output-def=${CMAKE_CURRENT_BINARY_DIR}/libnana.def"
                    )