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Handling Compiler Driver Differences ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ To pass options to the linker tool, each compiler driver has its own syntax. The ``LINKER:`` prefix and ``,`` separator can be used to specify, in a portable way, options to pass to the linker tool. ``LINKER:`` is replaced by the appropriate driver option and ``,`` by the appropriate driver separator. The driver prefix and driver separator are given by the values of the :variable:`CMAKE_<LANG>_LINKER_WRAPPER_FLAG` and :variable:`CMAKE_<LANG>_LINKER_WRAPPER_FLAG_SEP` variables. For example, ``"LINKER:-z,defs"`` becomes ``-Xlinker -z -Xlinker defs`` for ``Clang`` and ``-Wl,-z,defs`` for ``GNU GCC``. The ``LINKER:`` prefix can be specified as part of a ``SHELL:`` prefix expression. The ``LINKER:`` prefix supports, as an alternative syntax, specification of arguments using the ``SHELL:`` prefix and space as separator. The previous example then becomes ``"LINKER:SHELL:-z defs"``. .. note:: Specifying the ``SHELL:`` prefix anywhere other than at the beginning of the ``LINKER:`` prefix is not supported.