CMAKE_SHARED_MODULE_PREFIX

The prefix for loadable modules that you link to.

The prefix to use for the name of a loadable module on this platform.

CMAKE_SHARED_MODULE_PREFIX_<LANG> overrides this for language <LANG>.

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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.8/variable/CMAKE_SHARED_MODULE_PREFIX.html