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ci: use pure-Python PyYAML for Windows Python 3.15 tests
Disable the optional LibYAML extension before test dependency installation. Python 3.15 has no matching PyYAML wheel, and GPU test runners do not configure MSVC. Validated a source-built pure-Python wheel with an unavailable compiler; 268 CI-tool and Core tests plus 55 subtests passed against it.
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‎.github/workflows/test-wheel-windows.yml‎

Lines changed: 3 additions & 1 deletion
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@@ -336,13 +336,15 @@ jobs:
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# TODO: remove allow-prereleases once 3.15 is officially supported
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allow-prereleases: ${{ startsWith(matrix.PY_VER, '3.15') }}
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- name: Enable Scientific Python Nightly Wheels for Python 3.15
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- name: Configure test dependencies for Python 3.15
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if: ${{ (env.TEST_BINDINGS == 'true' || env.TEST_CORE == 'true' || env.TEST_PYTHON == 'true') &&
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startsWith(matrix.PY_VER, '3.15') }}
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shell: bash --noprofile --norc -xeuo pipefail {0}
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run: |
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echo "PIP_EXTRA_INDEX_URL=https://pypi.anaconda.org/scientific-python-nightly-wheels/simple" >> "$GITHUB_ENV"
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echo "PIP_ONLY_BINARY=numpy" >> "$GITHUB_ENV"
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# PyYAML has no cp315 wheels; use its pure-Python build without MSVC.
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echo "PYYAML_FORCE_LIBYAML=0" >> "$GITHUB_ENV"
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- name: Verify LongPathsEnabled
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run: |

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