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