Add a command line flag to mix metadata into the version hash #14471
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Jul 5, 2014
This is an implementation of [RFC 35](https://github.com/rust-lang/rfcs/blob/master/active/0035-remove-crate-id.md). The summary for this PR is the same as that of the RFC, with one addendum: * Removes the `#[crate_id]` attribute and knowledge of versions from rustc. * Added a `#[crate_name]` attribute similar to the old `#[crate_id]` attribute * Output filenames no longer have versions or hashes * Symbols no longer have versions (they still have hashes) * A new flag, `--extern`, is used to override searching for external crates * A new flag, `-C metadata=foo`, used when hashing symbols * [added] An old flag, `--crate-name`, was re purposed to specify the crate name from the command line. I tried to maintain backwards compatibility wherever possible (with warnings being printed). If I missed anywhere, however, please let me know! [breaking-change] Closes #14468 Closes #14469 Closes #14470 Closes #14471
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cc #14470
Cargo wants to be in control of deciding which version of a crate to link to, not rustc. Under the current cargo design, rustc does not need to know about version numbers at all except to frob the symbol hashes a bit. If rustc no longer knows about versioning, then it needs to provide some mechanism for mixing versioning metadata into the version hashes.
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