This variable is used with CMAKE_<LANG>_LINKER_WRAPPER_FLAG variable to format LINKER: prefix in the link options (see add_link_options() and target_link_options()).
When specified, arguments of the LINKER: prefix will be concatenated using this value as separator.
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https://cmake.org/cmake/help/v3.15/variable/CMAKE_LANG_LINKER_WRAPPER_FLAG_SEP.html