BUNDLE

From Get docs
Cmake/docs/3.21/prop tgt/bundle


BUNDLE

This target is a CFBundle on the macOS.

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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https://cmake.org/cmake/help/v3.21/prop_tgt/BUNDLE.html