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Add a 1.45 release note on lto vs. embed-bitcode #74374

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Jul 16, 2020
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Add a 1.45 release note on lto vs. embed-bitcode #74374

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10 changes: 10 additions & 0 deletions RELEASES.md
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Original file line number Diff line number Diff line change
Expand Up @@ -82,6 +82,9 @@ Stabilized APIs
Cargo
-----

- [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
time.][cargo/8066]

Misc
----
- [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
Expand All @@ -97,12 +100,18 @@ Compatibility Notes
- [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
previously undocumented and not intended for public use. Rustdoc still provides
a non-zero exit code on errors.
- [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
flags while cargo is adding `embed-bitcode` itself. The recommended way to
control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
or by setting `CARGO_PROFILE_<name>_LTO` in the environment.

Internals Only
--------------
- [Make clippy a git subtree instead of a git submodule][70655]
- [Unify the undo log of all snapshot types][69464]

[71848]: https://github.com/rust-lang/rust/issues/71848/
[73420]: https://github.com/rust-lang/rust/issues/73420/
[72324]: https://github.com/rust-lang/rust/pull/72324/
[71843]: https://github.com/rust-lang/rust/pull/71843/
Expand All @@ -129,6 +138,7 @@ Internals Only
[69813]: https://github.com/rust-lang/rust/pull/69813/
[69464]: https://github.com/rust-lang/rust/pull/69464/
[68717]: https://github.com/rust-lang/rust/pull/68717/
[cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
[`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
[`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
[`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
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