LLD doesn't handle `--warn-unresolved-symbols` the same as GNU LD
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Description
While upgrading tursodb to rust 1.90 I got this linker error on CI:
Running unittests src/lib.rs (target/debug/deps/turso_sync_js-5f98d3f835f912a1)
/home/runner/_work/turso/turso/target/debug/deps/turso_sync_js-5f98d3f835f912a1: symbol lookup error: /home/runner/_work/turso/turso/target/debug/deps/turso_sync_js-5f98d3f835f912a1: undefined symbol: napi_typeof
error: test failed, to rerun pass `-p turso_sync_js --lib`
As David pointed out, the --warn-unresolved-symbols flag is enabled and the error only happens during runtime.
Using the old linker fix the issue. I do not know how to properly debug this so any help would be appreciated :)
Version it worked on
It most recently worked on: 1.88
Version with regression
rustc --version --verbose:
rustc 1.90.0 (1159e78c4 2025-09-14)
binary: rustc
commit-hash: 1159e78c4747b02ef996e55082b704c09b970588
commit-date: 2025-09-14
host: x86_64-unknown-linux-gnu
release: 1.90.0
LLVM version: 20.1.8
@rustbot modify labels: +regression-from-stable-to-stable -regression-untriaged
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reproducing the tursodb CI failure with Rust 1.88 and 1.90, focusing on the --warn-unresolved-symbols linker flag and the napi_typeof runtime error. Compare the behavior with the old linker and GNU LD; done means unresolved symbols are handled consistently and the regression is covered by a reproducible test.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- rust
- Domain
- compilers
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100