Linker error when building dylib with "vectorcall" no_mangle fn on x86-64 Linux
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A-linkage
C-bug
O-linux
T-compiler
- Dominant language
- Rust
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- 119k
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Description
Building this file...
#![feature(abi_vectorcall)]
#[no_mangle]
#[inline(never)]
pub extern "vectorcall" fn call_with_42(i: i32) {
assert_eq!(i, 42);
}
with --crate-type=dylib leads to a linker error on my system (x86_64-unknown-linux-gnu):
$ rustc $filename --crate-type=dylib
error: linking with `cc` failed: exit status: 1
|
= note: LC_ALL="C" PATH="/home/r/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/bin:/home/r/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/bin/self-contained:/home/r/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/bin:/home/r/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/bin/self-contained:/home/r/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/bin:/home/r/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/bin/self-contained:/home/r/.opam/coq-8.19/bin:/home/r/bin:/home/r/.cargo/bin:/home/r/.local/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games" VSLANG="1033" "cc" "-Wl,--version-script=/tmp/rustc54p2UM/list" "-Wl,--no-undefined-version" "-m64" "/tmp/rustc54p2UM/symbols.o" "foreign-vectorcall.foreign_vectorcall.e458723e0d9c0914-cgu.0.rcgu.o" "foreign-vectorcall.5inwzblfweptyphk6iy8ows5f.rcgu.rmeta" "foreign-vectorcall.bq1je05mopu28e8i624qzs0l3.rcgu.o" "-Wl,--as-needed" "-Wl,-Bstatic" "/home/r/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-fa4c04b3e3e28f7e.rlib" "/home/r/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libpanic_unwind-eb97e423290e2a73.rlib" "/home/r/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libobject-6a3cbaef857276ba.rlib" "/home/r/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libmemchr-f14799023c8f2a27.rlib" "/home/r/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libaddr2line-ae67f58af1bc202d.rlib" "/home/r/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libgimli-07db6d7d16f60531.rlib" "/home/r/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_demangle-af5f9e36062cdfaa.rlib" "/home/r/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd_detect-f753d0635143b03f.rlib" "/home/r/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libhashbrown-02716de7358d6620.rlib" "/home/r/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_alloc-9099a438c5291bc6.rlib" "/home/r/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libminiz_oxide-4549192a05d95b2c.rlib" "/home/r/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libadler-017f0d0d69a7a874.rlib" "/home/r/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libunwind-ad6115df66a4cafe.rlib" "/home/r/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcfg_if-203703a910c15888.rlib" "/home/r/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/liblibc-fbe0149ad3765332.rlib" "/home/r/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/liballoc-d2c56345f3127d00.rlib" "/home/r/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_core-395a38b8e0851c9b.rlib" "/home/r/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcore-d453bab70303062c.rlib" "/home/r/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcompiler_builtins-d5e57876d7066b4c.rlib" "-Wl,-Bdynamic" "-lgcc_s" "-lutil" "-lrt" "-lpthread" "-lm" "-ldl" "-lc" "-B/home/r/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/bin/gcc-ld" "-B/home/r/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/bin/gcc-ld" "-B/home/r/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/bin/gcc-ld" "-fuse-ld=lld" "-Wl,--eh-frame-hdr" "-Wl,-z,noexecstack" "-L" "/home/r/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-o" "libforeign_vectorcall.so" "-shared" "-Wl,-soname=libforeign_vectorcall.so" "-Wl,-z,relro,-z,now" "-nodefaultlibs"
= note: rust-lld: error: foreign-vectorcall.foreign_vectorcall.e458723e0d9c0914-cgu.0.rcgu.o: symbol call_with_42@@8 has undefined version 8
collect2: error: ld returned 1 exit status
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 running the Rust reproducer with --crate-type=dylib on x86_64-unknown-linux-gnu and inspect the reported rust-lld undefined-version error. Trace how the vectorcall and #[no_mangle] entry point is emitted and linked; done means the reproducer builds successfully without the linker error.
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