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descriptor objects.
Build settings are units of configuration i.e. a key/value pair of a setting (e.g. cpu) and a value (e.g. ppc). A build setting descriptor is used to describe what kind of build setting a skylark rule is (if any at all). The BuildSettingDescriptor implementation of the API describes two facets of the build setting rule: the type of the value and whether or not the setting is settable on the command line.
The methods exposed here will eventually be hooked up to a new parameter in the <code> rule() </code> function. Validation for these restrictions will also happen in a later CL attached to the same bug.
PiperOrigin-RevId: 208669663
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juliexxia
cparsons