Mention `--print cfg` under set configuration options

rust-lang / reference

The Rust Reference

https://doc.rust-lang.org/nightly/reference/

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Mention `--print cfg` under set configuration options #1636

Closed tgross35 closed 1 month ago

tgross35 commented 1 month ago

This often serves as the landing page for information about which target_* configuration options are available. Mention that rustc can print the exact options available for each target.