cmake / 3.14.7 / prop_tgt / bundle_extension.html /

BUNDLE_EXTENSION

The file extension used to name a BUNDLE, a FRAMEWORK, or a MACOSX_BUNDLE target on the macOS and iOS.

The default value is bundle, framework, or app for the respective target types.

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https://cmake.org/cmake/help/v3.14/prop_tgt/BUNDLE_EXTENSION.html