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ImportError: DLL load failed while importing when libgcc 15.1.0 is installed #1398

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jessegrabowski opened this issue May 11, 2025 · 8 comments · Fixed by #1400
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ImportError: DLL load failed while importing when libgcc 15.1.0 is installed #1398

jessegrabowski opened this issue May 11, 2025 · 8 comments · Fixed by #1400
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bug Something isn't working C-backend compilation

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jessegrabowski commented May 11, 2025 •
edited by maresb
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Description

An update to the libgcc package is causing windows users to be unable to compile pytensor functions. Issue was reported and debugged by user DrEntropy here.

We should do a release ASAP with a version pin. This is also breaking tests on downstream packages (pymc-extras and pytensor-ml)
@jessegrabowski jessegrabowski added bug Something isn't working C-backend compilation labels May 11, 2025
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This also made me realize we don't actually test on windows, which seems wrong?

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@jessegrabowski jessegrabowski changed the title Pin libgcc<15 in requirements Pytensor finds wrong compiler on windows when libgcc>15 is installed May 12, 2025
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Updated this title to reflect what @maresb reported in #1399

@jessegrabowski jessegrabowski mentioned this issue May 12, 2025
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maresb commented May 12, 2025

Making some progress towards figuring out what's going on: #general > random cmake test failures all of a sudden

@maresb maresb changed the title Pytensor finds wrong compiler on windows when libgcc>15 is installed ImportError: DLL load failed while importing when libgcc 15.1.0 is installed May 12, 2025
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maresb commented May 12, 2025

The issue we're hitting: conda-forge/ctng-compilers-feedstock#174

Should be fixed in the latest build by conda-forge/pytensor-suite-feedstock#158

Retroactive fix is incoming

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maresb commented May 12, 2025

Retroactive fix is awaiting review in conda-forge/conda-forge-repodata-patches-feedstock#1024

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maresb commented May 12, 2025

This should alternatively be resolved for future versions by #1400.

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maresb commented May 13, 2025

@DrEntropy, the retroactive fix has been merged, so your original environment specification should now work.

@maresb maresb closed this as completed May 13, 2025
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@DrEntropy, the retroactive fix has been merged, so your original environment specification should now work.

Can confirm, working !

@ricardoV94 ricardoV94 mentioned this issue May 14, 2025
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