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Document supported-crate-types print request in unstable book

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Jieyou Xu 2025-03-18 13:37:36 +08:00
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# `print=supported-crate-types`
The tracking issue for this feature is: [#138640](https://github.com/rust-lang/rust/issues/138640).
------------------------
This option of the `--print` flag produces a list of crate types (delimited by newlines) supported for the given target.
The crate type strings correspond to the values accepted by the `--crate-type` flag.
Intended to be used like this:
```bash
rustc --print=supported-crate-types -Zunstable-options --target=x86_64-unknown-linux-gnu
```
Example output for `x86_64-unknown-linux-gnu`:
```text
bin
cdylib
dylib
lib
proc-macro
rlib
staticlib
```