Merge pull request #215 from rust-lang/wesleywiser-patch-1

Add notes for compiler triage meeting on 2019-10-31

Author: spastorino

content/minutes/triage-meeting/2019-10-31.md

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+---
+title: 2019.10.31
+type: docs
+---
+
+# 2019-10-31
+
+## Announcments
+
+Rust 1.39 ships on Thursday!
+
+## Backport nominations
+
+- "save-analysis: Account for async desugaring in async fn return types" [#65936](https://github.com/rust-lang/rust/pull/65936)
+  - Accepted for beta backport
+
+- "resolve: Turn the "non-empty glob must import something" error into a lint" [#65539](https://github.com/rust-lang/rust/pull/65539)
+  - Accepted for beta backport
+
+## Working group sync
+
+### [wg-pgo](https://rust-lang.github.io/compiler-team/working-groups/pgo/)
+
+- PGO is available in the stable compiler. Docs are in the rustc-guide and the rustc-book
+
+- Unfortunately we don't observe significant performance gains from applying it (except for tiny synthetic test cases).
+
+- [@michaelwoerister] asked for people to try PGO on irlo but haven't gotten a lot of feedback.
+
+- There is one interesting theory that Rust doesn't profit as much as C++ because it defaults to having fewer compilation units and thus can make better inlining decisions in the non-PGO case.
+
+- The working group will probably wind down as [@michaelwoerister] don't have time to pursue further and there are no actual known issues in the implementation.
+
+[Link to full discussion](https://rust-lang.zulipchat.com/#narrow/stream/131828-t-compiler/topic/weekly.20meeting.202019-10-31.20.2354818/near/179539153)
+
+### [wg-pipelining](https://rust-lang.github.io/compiler-team/working-groups/pipelining/)
+
+- Pipelining support has shipped in Rust 1.38.
+
+- The working group is winding down.
+
+[Link to full discussion](https://rust-lang.zulipchat.com/#narrow/stream/131828-t-compiler/topic/weekly.20meeting.202019-10-31.20.2354818/near/179539371)
+
+[@michaelwoerister]: https://github.com/michaelwoerister