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Rollup merge of #74374 - cuviper:lto-bitcode-1.45, r=Mark-Simulacrum

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

I added a bullet for Cargo's use of `embed-bitcode`, since that was even noteworthy enough for the Inside Rust blog. Then more importantly, I added a compatibility note for how this may interact poorly with manually enabling LTO.

r? @Mark-Simulacrum
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Manish Goregaokar 2020-07-15 11:01:33 -07:00 committed by GitHub
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@ -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.
@ -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/
@ -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