rust-lang / rust-lang/rust

rust-lld: error: undefined symbol: __gxx_personality_v0

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A-linkage A-linkers A-lld C-bug regression-untriaged requires-nightly S-has-mcve T-compiler
Dominant language
Rust
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Description

We encountered a bug, where the experimental rust-lld currently activated under nightly linux / x86-64, can't links certain executables in release mode with the "intel_tex_2" crate. Switching to the old linker solves the problem.

I created a small repository which includes a minimal example.

https://github.com/hasenbanck/rust_lld_bug

It will crash when compiled via:

cargo run --release

Normaly it should compile fine, but we instead get the following error:

error: linking with `cc` failed: exit status: 1
  |
  = note: LC_ALL="C" PATH=".....*A LOT OF PATHS*...."
  = note: some arguments are omitted. use `--verbose` to show all linker arguments
  = note: rust-lld: error: undefined symbol: __gxx_personality_v0
          >>> referenced by ispc_texcomp_astc.cpp
          >>>               ispc_texcomp_astc.o:(DW.ref.__gxx_personality_v0) in archive /mnt/c/Development/rust_lld_bug/target/release/deps/libintel_tex_2-2caaaa92d5e41391.rlib
          collect2: error: ld returned 1 exit status

error: could not compile `rust_lld_bug` (bin "rust_lld_bug") due to 1 previous error

We used the nightly toolchain 2025-01-07, but older nightly versions are also affected.
We reproduces this error under WSL Ubuntu 24.04 and Fedora 41 running on bare metal.

The old linker works fine:

RUSTFLAGS="-Z linker-features=-lld" cargo run --release

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start with the minimal reproduction at https://github.com/hasenbanck/rust_lld_bug and run cargo run --release using the affected nightly toolchain. Compare it with RUSTFLAGS="-Z linker-features=-lld" cargo run --release; the issue is done when the release build links successfully with rust-lld without the undefined __gxx_personality_v0 error.

Written by the indexing model from the issue text.

Assessment

Tech stack
rust
Domain
build-system, compilers
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
30/100

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