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WINDOWS_EXPORT_ALL_SYMBOLS
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--------------------------
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This property is implemented only for MS-compatible tools on Windows.
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Enable this boolean property to automatically create a module definition
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(``.def``) file with all global symbols found in the input ``.obj`` files
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for a ``SHARED`` library (or executable with :prop_tgt:`ENABLE_EXPORTS`)
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on Windows. The module definition file will be passed to the linker
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causing all symbols to be exported from the ``.dll``.
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For global *data* symbols, ``__declspec(dllimport)`` must still be used when
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compiling against the code in the ``.dll``. All other function symbols will
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be automatically exported and imported by callers. This simplifies porting
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projects to Windows by reducing the need for explicit ``dllexport`` markup,
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even in ``C++`` classes.
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When this property is enabled, zero or more ``.def`` files may also be
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specified as source files of the target. The exports named by these files
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will be merged with those detected from the object files to generate a
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single module definition file to be passed to the linker. This can be
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used to export symbols from a ``.dll`` that are not in any of its object
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files but are added by the linker from dependencies (e.g. ``msvcrt.lib``).
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This property is initialized by the value of
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the :variable:`CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS` variable if it is set
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when a target is created.
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