meson/docs/markdown/snippets/feature_options.md

New feature option type

A new type of option can be defined in meson_options.txt for the traditional enabled / disabled / auto tristate. The value of this option can be passed to the required keyword argument of functions dependency(), find_library(), find_program() and add_languages().

A new global option auto_features has been added to override the value of all auto features. It is intended to be used by packagers to have full control on which feature must be enabled or disabled.