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To: Dr Bean via Cygwin <cygwin AT cygwin DOT com>
Subject: RE: rust library returns "Invalid target name: 'x86_64-pc-cygwin'"
Thread-Topic: rust library returns "Invalid target name: 'x86_64-pc-cygwin'"
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Date: Mon, 23 Feb 2026 10:35:09 +0000
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From: "Old, Oliver via Cygwin" <cygwin AT cygwin DOT com>
Reply-To: "Old, Oliver" <Oliver DOT Old AT loewen DOT de>
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Hi Dr Bean,

This is caused by an old version of target-lexicon being pulled in.

v0.13.3 of target-lexicon added support for Cygwin targets.
https://github.com/bytecodealliance/target-lexicon/commit/03a3e6966c6ffa4d5685411a202339627fb28f41

It's a transitive dependency of pyo3-build-config.

You would have to upgrade pydantic to v2.13.0b1 to fix that. They upgraded to
PyO3 v0.28 in that release, which pulls in the fixed version of target-lexicon.
https://github.com/pydantic/pydantic/commit/c42224acb31dd9f374124a74809332246e595194
https://github.com/PyO3/pyo3/commit/30a0209b212721674b619bfe405ae21e4a42a163

Best regards

Oliver Old

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