UV `11.0` flash-attn incompatibility

[Samoed]

Summary

I have configured flash attention as described in https://docs.astral.sh/uv/concepts/projects/config/#augmenting-build-dependencies

[project]
name = "uvflash"
version = "0.1.0"
description = "Add your description here"
readme = "README.md"
requires-python = ">=3.14"
dependencies = [
    "torch>=2.11.0",
]

[project.optional-dependencies]
flash_attention = ["flash-attn>=2.6.3"]

[tool.uv.extra-build-dependencies]
flash-attn = [{ requirement = "torch", match-runtime = true }]

And when I try uv sync I get error

  × Failed to download and build `flash-attn==2.8.3`
  ╰─▶ Extra build requirement `torch` was declared with `match-runtime = true`, but `flash-attn` does not declare static metadata, making runtime-matching impossible
  help: `flash-attn` (v2.8.3) was included because `uvflash[flash-attention]` (v0.1.0) depends on `flash-attn>=2.6.3`

But on uv<0.11.0 this worked correctly

Platform

mac, ubuntu, any

Version

0.11.0

Python version

any

[Samoed]

Even with this pyproject

[project]
name = "uvflash"
version = "0.1.0"
description = "Add your description here"
readme = "README.md"
requires-python = ">=3.14"
dependencies = []

[tool.uv.extra-build-dependencies]
flash-attn = [{ requirement = "torch", match-runtime = true }]

Command would fail

uv add torch flash-attn
  × Failed to download and build `flash-attn==2.8.3`
  ╰─▶ Extra build requirement `torch` was declared with `match-runtime = true`, but `flash-attn` does not declare static metadata, making runtime-matching impossible
  help: If you want to add the package regardless of the failed resolution, provide the `--frozen` flag to skip locking and syncing.

[zsol]

I can reproduce this with uv@0.11.0, but uvx uv@0.10.12 add torch flash-attn works fine with the latest example

[konstin]

This is both a significant regression, and something that shouldn't have worked in the first place. The project declares Dynamic: requires-dist, which previously slipped through due to case-sensitivity (#18669, https://inspector.pypi.io/project/flash-attn/2.8.3/packages/3b/b2/8d76c41ad7974ee264754709c22963447f7f8134613fd9ce80984ed0dab7/flash_attn-2.8.3.tar.gz/flash_attn-2.8.3/PKG-INFO#line.23)

[charliermarsh]

Re-reading the spec... shouldn't we just ignore Dynamic for wheels?