Serialization security default

PyTorch _GLIBCXX_USE_CXX11_ABI custom extension documentation

A current PyTorch task fails with: PyTorch custom C++ extension undefined symbol after CXX11 ABI change.

search-necessaryPyTorchPython ML serializationSerialization security defaultgitdocs_candidate100

Agent Quick Fix

The local workspace gives the symptom and stale integration shape, but the correct repair depends on current official product behavior or recent release notes.

Product: PyTorch
Current-contract area: PyTorch custom C++ extension undefined symbol after CXX11 ABI change
Likely root cause: A current PyTorch task fails with: PyTorch custom C++ extension undefined symbol after CXX11 ABI change. The local stale integration is plausible but may not reflect the current external contract.
Repair direction: Verifier accepts a repair record only if it states the current contract and an actionable fix using source-backed product terms.

Validation Status

Codex searched organically, passed with web access, and failed the no-web counterfactual under this fixture.

Symptom

A current PyTorch task fails with: PyTorch custom C++ extension undefined symbol after CXX11 ABI change. The local stale integration is plausible but may not reflect the current external contract.

Why This Happens

The local workspace gives the symptom and stale integration shape, but the correct repair depends on current official product behavior or recent release notes.

Verification

Verifier accepts a repair record only if it states the current contract and an actionable fix using source-backed product terms.

Common Wrong Fixes

Changing local code without checking the current external contract.
Retrying the same install, build, or API call with no version/source change.
Applying a broad unsafe bypass when a narrow compatibility fix is available.

Codex Search Keywords

These are the search terms observed in a neutral Codex validation run for this failure shape.

site:pytorch.org CXX11 ABI PyTorch custom C++ extension undefined symbol _GLIBCXX_USE_CXX11_ABI
PyTorch _GLIBCXX_USE_CXX11_ABI custom extension documentation
site:pytorch.org/docs torch.utils.cpp_extension ABI compatible compiler _GLIBCXX_USE_CXX11_ABI
https://pytorch.org/docs/stable/cpp_extension.html
'ABI' in https://docs.pytorch.org/docs/2.12/cpp_extension.html
https://docs.pytorch.org/docs/2.12/cpp_extension.html
https://raw.githubusercontent.com/pytorch/pytorch/v2.12.0/torch/utils/cpp_extension.py
'_add_gnu_cpp_abi_flag' in https://raw.githubusercontent.com/pytorch/pytorch/v2.12.0/torch/utils/cpp_extension.py
'_get_glibcxx_abi_build_flags' in https://raw.githubusercontent.com/pytorch/pytorch/v2.12.0/torch/utils/cpp_extension.py
PyTorch 2.6 CXX11 ABI manylinux 2.28 custom extension
site:github.com/pytorch/pytorch _GLIBCXX_USE_CXX11_ABI manylinux 2.28 PyTorch
"PyTorch" "CXX11 ABI" "manylinux_2_28"
"_GLIBCXX_USE_CXX11_ABI" "PyTorch" "wheels"
https://github.com/pytorch/pytorch/blob/v2.12.0/torch/utils/cpp_extension.py
https://pytorch.org/blog/pytorch2-6/
https://pytorch.org/blog/pytorch2-7/
PyTorch 2.7 release blog CXX11_ABI=1 manylinux 2.28
https://pytorch.org/blog/pytorch-2-7/

Source Trail

GitHub source file/reference: