Who contributed to Rust on July 26, 2026?

7 developers shipped this update, including 许杰友 Jieyou Xu (Joe), joshlf, bors, Kobzol, glandium, pw0908, and wsmoses.

What were the notable Rust updates?

Implement opt-in debugger discovery for GDB and LLDB in bootstrap, Auto merge of #159455 - Kobzol:bootstrap-discover-lldb, r=jieyouxu, and codegen: handle OperandValue::Uninit in codegen_return_terminator.

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The Wire · Showcase

DEBUGGER DISCOVERY NOW OPT-IN, CODEGEN BUG FIXED

By RepoJournal · Filed 06:58 UTC on July 26, 2026 · About Rust

7 people shipped this

glandium @glandium 2 cited

bors @bors 1 cited

Kobzol @Kobzol 1 cited

pw0908 @pw0908 1 cited

wsmoses @wsmoses 1 cited

许杰友 Jieyou Xu (Joe) @jieyouxu

joshlf @joshlf

GDB and LLDB no longer auto-discover in bootstrap, forcing developers to explicitly configure debuggers or skip debuginfo tests entirely.

The compiler's bootstrap system flipped a critical default: GDB and LLDB debugging is no longer automatically detected [1]. Developers must now opt in using `build.gdb/lldb = "discover"` to run debuginfo tests, though CDB on Windows remains auto-detected [2]. This is a behavioral shift that will surface in CI pipelines and local test runs. In parallel, the codegen layer fixed a latent crash where functions returning entirely-uninitialized values like `MaybeUninit::uninit()` would ICE when hitting the `PassMode::Direct | PassMode::Pair` branch [3]. The bug was introduced when `OperandValue::Uninit` landed to optimize away uninit constant stores but missed one critical path [4]. Over in Enzyme (the autodiff compiler framework), AIR compatibility landed to broaden GPU architecture support [5], paired with CI improvements disabling macOS debug lit tests to preserve limited CI capacity [6]. Across all four repos, 58 commits and 6 PRs shipped in 24 hours.

Action items

→ Update your config.toml to explicitly set debugger discovery if you rely on GDB or LLDB tests rust-lang/rust [plan]
→ Review any CI that expects debuginfo tests to run by default; they will now be skipped rust-lang/rust [monitor]
→ Test codegen fixes on functions returning MaybeUninit values in your codebase rust-lang/rust [monitor]

References

[1] Implement opt-in debugger discovery for GDB and LLDB in bootstrap ↗ rust-lang/rust
[2] Auto merge of #159455 - Kobzol:bootstrap-discover-lldb, r=jieyouxu rust-lang/rust
[3] codegen: handle OperandValue::Uninit in codegen_return_terminator ↗ rust-lang/rust
[4] codegen: handle OperandValue::Uninit in codegen_return_terminator rust-lang/rust
[5] Add AIR compatibility ↗ rust-lang/enzyme
[6] Disable enzyme lit test ci for macos debug ↗ rust-lang/enzyme

Quick answers

What shipped in Rust on July 26, 2026?: GDB and LLDB no longer auto-discover in bootstrap, forcing developers to explicitly configure debuggers or skip debuginfo tests entirely. In total, 58 commits and 6 pull requests landed.
Who contributed to Rust on July 26, 2026?: 7 developers shipped this update, including 许杰友 Jieyou Xu (Joe), joshlf, bors, Kobzol, glandium, pw0908, and wsmoses.
What were the notable Rust updates?: Implement opt-in debugger discovery for GDB and LLDB in bootstrap, Auto merge of #159455 - Kobzol:bootstrap-discover-lldb, r=jieyouxu, and codegen: handle OperandValue::Uninit in codegen_return_terminator.

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