[CMake] what options

[Owen Hogarth II]

If you have a cmake project, what's the way to see what type of
configuration options are available?

For example I know that I can pass -DCMAKE_PREFIX_PATH the set where the
project will be installed.

Sometimes project creators add other things, such as building static or
share libraries, SSE, NEON or other flags like those.

Is there a way to have cmake show all of those that the current project has
exposed?
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