Module bootstrap::core::build_steps::synthetic_targets
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In some cases, parts of bootstrap need to change part of a target spec just for one or a few steps. Adding these targets to rustc proper would “leak” this implementation detail of bootstrap, and would make it more complex to apply additional changes if the need arises.
To address that problem, this module implements support for “synthetic targets”. Synthetic targets are custom target specs generated using builtin target specs as their base. You can use one of the target specs already defined in this module, or create new ones by adding a new step that calls create_synthetic_target.