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fix(runtime): #4876 keep js_promise_report_unhandled_rejections alive through auto-optimize LTO #4883

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Merged
proggeramlug merged 1 commit into from
Jun 10, 2026
Merged

fix(runtime): #4876 keep js_promise_report_unhandled_rejections alive through auto-optimize LTO #4883

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21 changes: 21 additions & 0 deletions CHANGELOG.md
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## v0.5.1153 — fix: keep `js_promise_report_unhandled_rejections` alive through auto-optimize LTO (#4876)

**Regression fix (v0.5.1151 → all native links broken).** Codegen emits an
unconditional call to `js_promise_report_unhandled_rejections` in the generated
`_main` (the program-end unhandled-rejection hook from the #4838/#4852 readable
unhandled-rejection work), but the runtime symbol was being dropped by the
auto-optimize whole-program-bitcode internalize+dead-strip pass. The function is
`#[no_mangle] pub extern "C"` and reachable only from generated `.o`, so without a
`#[used]` anchor LTO internalized and stripped it — every native link
(`aarch64-apple-{darwin,ios,tvos}`, `x86_64-unknown-linux-gnu`) failed with
`undefined symbol: js_promise_report_unhandled_rejections`. (Android linked because
it doesn't go through the same auto-optimize bitcode path.)

- **Fix**: added a `#[used] static KEEP_PROMISE_REPORT_UNHANDLED_REJECTIONS` anchor in
`crates/perry-runtime/src/promise/then.rs`, matching the existing keepalive pattern
used for codegen-only FFIs in `error.rs` and `promise/combinators.rs`.
- **Validation**: built perry + runtime/stdlib, cleared `.perry-cache`, compiled a
minimal program with an unhandled `Promise.reject` — the auto-optimize path
(rebuilds runtime+stdlib with LTO) now links cleanly and prints
`Uncaught (in promise) Error: boom` with exit code 1.

## v0.5.1152 — install.sh download/extraction progress + per-distro Linux toolchain docs (#4869)

External contribution from @nglmercer, with a maintainer fixup at review time:
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2 changes: 1 addition & 1 deletion CLAUDE.md
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Expand Up @@ -8,7 +8,7 @@ This file provides guidance to Claude Code (claude.ai/code) when working with co

Perry is a native TypeScript compiler written in Rust that compiles TypeScript source code directly to native executables. It uses SWC for TypeScript parsing and LLVM for code generation.

**Current Version:** 0.5.1152
**Current Version:** 0.5.1153


## TypeScript Parity Status
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