Use mold as the linker in CI

[sunlei]

Pull Request

Use mold as the linker.

• https://github.com/rui314/mold
• Removed unnecessary target configurations
• Utilized actions provided by the mold author https://github.com/rui314/setup-mold
  • Directly symlinked ld to mold
  • mold is only used in the CI environment

Type of change

• New feature (non-breaking change which adds functionality)

How has this change been tested?

Verified mold usage with readelf:
More detail: https://github.com/nautechsystems/nautilus_trader/actions/runs/12972428504/job/36179870352?pr=2254 (Verify mold)

----------
Processing: nautilus_core/target/debug/nautilus

String dump of section '.comment':
  [     0]  mold 2.36.0 (c3a957c4dc0788ba1e05eea8129c0784cf65fc59; compatible with GNU ld)
  [    4f]  GCC: (Ubuntu 13.3.0-6ubuntu2~24.04) 13.3.0
  [    7a]  Ubuntu clang version 18.1.3 (1ubuntu1)
  [    a1]  rustc version 1.84.0 (9fc6b4312 2025-01-07)

----------
Processing: nautilus_core/target/debug/libnautilus_pyo3.so

String dump of section '.comment':
  [     0]  mold 2.36.0 (c3a957c4dc0788ba1e05eea8129c0784cf65fc59; compatible with GNU ld)
  [    4f]  GCC: (Ubuntu 13.3.0-6ubuntu2~24.04) 13.3.0
  [    7a]  Ubuntu clang version 18.1.3 (1ubuntu1)
  [    a1]  rustc version 1.84.0 (9fc6b4312 2025-01-07)

----------
Processing: nautilus_core/target/debug/tardis-http

String dump of section '.comment':
  [     0]  mold 2.36.0 (c3a957c4dc0788ba1e05eea8129c0784cf65fc59; compatible with GNU ld)
  [    4f]  GCC: (Ubuntu 13.3.0-6ubuntu2~24.04) 13.3.0
  [    7a]  Ubuntu clang version 18.1.3 (1ubuntu1)
  [    a1]  rustc version 1.84.0 (9fc6b4312 2025-01-07)

----------
Processing: nautilus_core/target/debug/tardis-csv

String dump of section '.comment':
  [     0]  mold 2.36.0 (c3a957c4dc0788ba1e05eea8129c0784cf65fc59; compatible with GNU ld)
  [    4f]  GCC: (Ubuntu 13.3.0-6ubuntu2~24.04) 13.3.0
  [    7a]  Ubuntu clang version 18.1.3 (1ubuntu1)
  [    a1]  rustc version 1.84.0 (9fc6b4312 2025-01-07)

----------
Processing: nautilus_core/target/debug/libnautilus_cryptography.so

String dump of section '.comment':
  [     0]  mold 2.36.0 (c3a957c4dc0788ba1e05eea8129c0784cf65fc59; compatible with GNU ld)
  [    4f]  GCC: (Ubuntu 13.3.0-6ubuntu2~24.04) 13.3.0
  [    7a]  Ubuntu clang version 18.1.3 (1ubuntu1)
  [    a1]  rustc version 1.84.0 (9fc6b4312 2025-01-07)

----------
Processing: nautilus_core/target/debug/libnautilus_infrastructure.so

String dump of section '.comment':
  [     0]  mold 2.36.0 (c3a957c4dc0788ba1e05eea8129c0784cf65fc59; compatible with GNU ld)
  [    4f]  GCC: (Ubuntu 13.3.0-6ubuntu2~24.04) 13.3.0
  [    7a]  Ubuntu clang version 18.1.3 (1ubuntu1)
  [    a1]  rustc version 1.84.0 (9fc6b4312 2025-01-07)

----------
Processing: nautilus_core/target/debug/libnautilus_risk.so

String dump of section '.comment':
  [     0]  mold 2.36.0 (c3a957c4dc0788ba1e05eea8129c0784cf65fc59; compatible with GNU ld)
  [    4f]  GCC: (Ubuntu 13.3.0-6ubuntu2~24.04) 13.3.0
  [    7a]  rustc version 1.84.0 (9fc6b4312 2025-01-07)

[cjdsellers]

Hi @sunlei

Thanks for looking into this.

I think this is a good change, as we can reasonably expect performance improvements. Since it’s limited to CI, it won’t add complexity to local builds for users installing from source.

Developers more familiar with the codebase can continue experimenting with mold locally to potentially speed up the dev iteration cycle.