BUNDLE

This target is a CFBundle on the OS X.

If a module library target has this property set to true it will be built as a CFBundle when built on the mac. It will have the directory structure required for a CFBundle and will be suitable to be used for creating Browser Plugins or other application resources.

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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.5/prop_tgt/BUNDLE.html