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simplicity-sys: tests with test-utils fail to link on Linux since #393 (static library order) #407

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simplicity-sys: tests with test-utils fail to link on Linux since #393 (static library order)#407

Description

@KyrylR
KyrylR
opened on Nov 10, 2026

I have tried to run the https://github.com/apoelstra/local-nix-ci and encountered the issue

Since #393 (82124c7), simplicity-sys's own test binary fails to link on Linux with GNU ld when test-utils is enabled, on Rust 1.88 and newer

If you have Linux you can just run the cd simplicity-sys && cargo test --features test-utils from project root

Commit Rust 1.88, Linux Rust 1.74, Linux
546bafe (parent of 82124c7) passes (12 tests) not tested
82124c7 (#393) link error not tested
7fb2601 (current master) link error passes (14 tests)

Before filing a PR to fix it wanna understand whether anyone else also had the same issue

Activity

  1. delta1 commented on Nov 10, 2026

    @delta1
    delta1
    on Nov 10, 2026
    Contributor

    I can't reproduce this on Debian 13 with Rust 1.99 . Could it be specific to the Nix setup?

  2. apoelstra commented on Nov 10, 2026

    @apoelstra
    apoelstra
    on Nov 10, 2026
    Collaborator

    Lemme try to update my nightly pin and see if it shows up.

  3. KyrylR commented on Nov 11, 2026

    @KyrylR
    KyrylR
    on Nov 11, 2026
    CollaboratorAuthor

    I am on MacOS, I used this command:

    docker run --rm rust:1.88-bookworm bash -c '
  git clone -q https://github.com/BlockstreamResearch/rust-simplicity &&
  cd rust-simplicity && git checkout -q 7fb2601 &&
  cd simplicity-sys && cargo test --features test-utils'

    To reproduce the bug

    Here is the output (part of it):

    ~  ✔ docker run --rm rust:1.88-bookworm bash -c '
  git clone -q https://github.com/BlockstreamResearch/rust-simplicity &&
  cd rust-simplicity && git checkout -q 7fb2601 &&
  cd simplicity-sys && cargo test --features test-utils'
    Updating crates.io index
     Locking 83 packages to latest compatible versions
      Adding base64 v0.22.1 (available: v0.23.1)
      Adding getrandom v0.2.17 (available: v0.4.3)
      Adding logos v0.15.1 (available: v0.16.1)
      Adding miniscript v12.3.8 (available: v13.2.0)
      Adding simplicity-lang v0.3.1 (available: v0.9.0)
 Downloading crates ...
  Downloaded find-msvc-tools v0.1.15
  Downloaded shlex v2.0.1
  Downloaded bitcoin_hashes v1.2.0
  Downloaded bitcoin-internals v0.7.0
  Downloaded hex-conservative v1.3.0
  Downloaded bitcoin-internals v0.6.0
  Downloaded bitcoin-consensus-encoding v1.3.0
  Downloaded arrayvec v0.7.8
  Downloaded cc v1.11.1
   Compiling bitcoin-internals v0.7.0
   Compiling find-msvc-tools v0.1.15
   Compiling bitcoin-internals v0.6.0
   Compiling shlex v2.0.1
   Compiling cc v1.11.1
   Compiling bitcoin-consensus-encoding v1.3.0
   Compiling bitcoin_hashes v1.2.0
   Compiling simplicity-sys v0.8.0 (/rust-simplicity/simplicity-sys)
error: linking with `cc` failed: exit status: 1
  |
  = note:  "cc" "/tmp/rustc35KT3C/symbols.o" "<59 object files omitted>" "-Wl,--as-needed" "-Wl,-Bstatic" "-lRustSimplicityCommon" "-lBitcoinSimplicity" "-lElementsSimplicity" "<sysroot>/lib/rustlib/aarch64-unknown-linux-gnu/lib/{libtest-*,libgetopts-*,libunicode_width-*,librustc_std_workspace_std-*}.rlib" "/rust-simplicity/target/debug/deps/{libbitcoin_hashes-1d310cbc78435774.rlib,libbitcoin_internals-7f113ae3b67ae29c.rlib,libbitcoin_consensus_encoding-b232453a743fc305.rlib,libbitcoin_internals-5c33f7c60c22912d.rlib}.rlib" "<sysroot>/lib/rustlib/aarch64-unknown-linux-gnu/lib/{libstd-*,libpanic_unwind-*,libobject-*,libmemchr-*,libaddr2line-*,libgimli-*,librustc_demangle-*,libstd_detect-*,libhashbrown-*,librustc_std_workspace_alloc-*,libminiz_oxide-*,libadler2-*,libunwind-*,libcfg_if-*,liblibc-*,liballoc-*,librustc_std_workspace_core-*,libcore-*,libcompiler_builtins-*}.rlib" "-Wl,-Bdynamic" "-lgcc_s" "-lutil" "-lrt" "-lpthread" "-lm" "-ldl" "-lc" "-L" "/tmp/rustc35KT3C/raw-dylibs" "-Wl,--eh-frame-hdr" "-Wl,-z,noexecstack" "-L" "/rust-simplicity/target/debug/build/simplicity-sys-86fc4f093920468d/out" "-L" "/rust-simplicity/target/debug/build/simplicity-sys-86fc4f093920468d/out" "-L" "/rust-simplicity/target/debug/build/simplicity-sys-86fc4f093920468d/out" "-L" "<sysroot>/lib/rustlib/aarch64-unknown-linux-gnu/lib" "-o" "/rust-simplicity/target/debug/deps/simplicity_sys-f0cfda2749c1621c" "-Wl,--gc-sections" "-pie" "-Wl,-z,relro,-z,now" "-nodefaultlibs"
  = note: some arguments are omitted. use `--verbose` to show all linker arguments
  = note: /usr/bin/ld: /rust-simplicity/target/debug/build/simplicity-sys-86fc4f093920468d/out/libElementsSimplicity.a(6dfd0380989e1732-primitive.o):(.data.rel.ro.jet_node.0+0x0): undefined reference to `rustsimplicity_0_8_add_16'
          /usr/bin/ld: /rust-simplicity/target/debug/build/simplicity-sys-86fc4f093920468d/out/libElementsSimplicity.a(6dfd0380989e1732-primitive.o):(.data.rel.ro.jet_node.0+0x60): undefined reference to `rustsimplicity_0_8_add_32'


... <a lot of  undefined reference to> ...


licity_0_8_xor_xor_64'
          /usr/bin/ld: /rust-simplicity/target/debug/build/simplicity-sys-86fc4f093920468d/out/libElementsSimplicity.a(6dfd0380989e1732-primitive.o):(.data.rel.ro.jet_node.0+0xb040): undefined reference to `rustsimplicity_0_8_xor_xor_8'
          /usr/bin/ld: /rust-simplicity/target/debug/build/simplicity-sys-86fc4f093920468d/out/libElementsSimplicity.a(6dfd0380989e1732-elementsJets.o): in function `rustsimplicity_0_8_build_taptweak':
          /rust-simplicity/simplicity-sys/depend/simplicity/elements/elementsJets.c:870: undefined reference to `rustsimplicity_0_8_generic_taptweak'
          collect2: error: ld returned 1 exit status

  = note: some `extern` functions couldn't be found; some native libraries may need to be installed or have their path specified
  = note: use the `-l` flag to specify native libraries to link
  = note: use the `cargo:rustc-link-lib` directive to specify the native libraries to link with Cargo (see https://doc.rust-lang.org/cargo/reference/build-scripts.html#rustc-link-lib)

error: could not compile `simplicity-sys` (lib test) due to 1 previous error

What's next:
    Debug this container error with Gordon → docker ai "help me fix this container error"

  4. KyrylR commented on Nov 11, 2026

    @KyrylR
    KyrylR
    on Nov 11, 2026
    CollaboratorAuthor

    I can't reproduce this on Debian 13 with Rust 1.99 . Could it be specific to the Nix setup?

    Tried the (rust 1.99)

    docker run --rm rust:1.99-bookworm bash -c '
  git clone -q https://github.com/BlockstreamResearch/rust-simplicity &&
  cd rust-simplicity && git checkout -q 7fb2601 &&
  cd simplicity-sys && cargo test --features test-utils'

    also fails

    After looking with AI (Opus 5.5) into it, it says the following

    delta1 tested on x86_64, where Rust 1.90+ links with the bundled rust-lld and hides the bug. The bug affects:

    • every Linux target that still links with GNU ld, such as arm64;
    • x86_64 with Rust older than 1.90 (1.88 fails);
    • x86_64 with Rust 1.90+ when rust-lld is turned off, which some distro and Nix toolchains do;
    • anyone whose cc points at GNU ld.

    Nix isn't the cause: it fails in plain Docker images too. andrew-ci ran under Docker on your Mac, so it was arm64 as well.

    On 7fb2601, cd simplicity-sys && cargo test --features test-utils:

    Target Rust Linker Result
    x86_64-linux 1.99.1 rust-lld (default) passes (14)
    x86_64-linux 1.99.1 GNU ld (RUSTFLAGS="-Clinker-features=-lld") link error
    x86_64-linux 1.88 GNU ld (default) link error
    aarch64-linux 1.99.1 GNU ld (default) link error

  5. KyrylR commented on Nov 11, 2026

    @KyrylR
    KyrylR
    on Nov 11, 2026
    CollaboratorAuthor

    Now it looks same weird rabbit hole with linker, do not really see a need to spend time on it

  6. apoelstra commented on Nov 11, 2026

    @apoelstra
    apoelstra
    on Nov 11, 2026
    Collaborator

    A long time ago in Liquid we replaced our linker with gold because of weird linker issues like this.

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