[all-commits] [llvm/llvm-project] 74858f: Add Nix recipe for collecting linker reproducers. ...

[Peter Collingbourne via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 74858f366bad87d24f41819b015bcc1043daead7
      https://github.com/llvm/llvm-project/commit/74858f366bad87d24f41819b015bcc1043daead7
  Author: Peter Collingbourne <pcc at google.com>
  Date:   2025-10-09 (Thu, 09 Oct 2025)

  Changed paths:
    A lld/utils/speed-test-reproducers/collect.nix
    A lld/utils/speed-test-reproducers/ld-wrapper.sh

  Log Message:
  -----------
  Add Nix recipe for collecting linker reproducers. (#145789)

As proposed in:

https://discourse.llvm.org/t/improving-the-reproducibility-of-linker-benchmarking/86057

This is a Nix recipe for collecting reproducers for benchmarking
purposes
in a reproducible way. It works by injecting a linker wrapper that
embeds
a reproducer tarball into a non-allocated section of every linked
object,
which generally causes them to be smuggled out of the build tree in a
section of the final binaries.

It may be used in conjunction with the script lld/utils/run_benchmark.py
to measure the relative performance of linker changes or compare
the performance of different linkers.



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