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[Bug]: Cygwin builds are broken #28712

Open
@QuLogic

Description

@QuLogic

Bug summary

Seehttps://github.com/matplotlib/matplotlib/actions/runs/10361240536/job/28681178039#step:12:209.

This is mostly just a tracking issue to point people to; the error is in compilingcontourpy, which is tracked here:contourpy/contourpy#409 but due to a pybind11 issue here:pybind/pybind11#5224

Code for reproduction

n/a

Actual outcome

      ccache c++ -Isrc/_contourpy.cpython-39-x86_64-cygwin.dll.p -Isrc -I../src -I/usr/include/python3.9 -I/usr/local/lib/python3.9/site-packages/pybind11/include -fvisibility=hidden -fdiagnostics-color=always -DNDEBUG -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -Werror -std=c++17 -O3 -DCONTOURPY_VERSION=1.2.1 -MD -MQ src/_contourpy.cpython-39-x86_64-cygwin.dll.p/wrap.cpp.o -MF src/_contourpy.cpython-39-x86_64-cygwin.dll.p/wrap.cpp.o.d -o src/_contourpy.cpython-39-x86_64-cygwin.dll.p/wrap.cpp.o -c ../src/wrap.cpp      In file included from /usr/lib/gcc/x86_64-pc-cygwin/12/include/c++/bits/specfun.h:45,                       from /usr/lib/gcc/x86_64-pc-cygwin/12/include/c++/cmath:1935,                       from /usr/lib/gcc/x86_64-pc-cygwin/12/include/c++/math.h:36,                       from /usr/include/python3.9/pyport.h:205,                       from /usr/include/python3.9/Python.h:50,                       from /usr/local/lib/python3.9/site-packages/pybind11/include/pybind11/detail/../detail/common.h:274,                       from /usr/local/lib/python3.9/site-packages/pybind11/include/pybind11/detail/../attr.h:13,                       from /usr/local/lib/python3.9/site-packages/pybind11/include/pybind11/detail/class.h:12,                       from /usr/local/lib/python3.9/site-packages/pybind11/include/pybind11/pybind11.h:13,                       from ../src/common.h:4,                       from ../src/output_array.h:4,                       from ../src/chunk_local.h:4,                       from ../src/base.h:13,                       from ../src/base_impl.h:4,                       from ../src/wrap.cpp:1:      In static member function 'static _Up* std::__copy_move<_IsMove, true, std::random_access_iterator_tag>::__copy_m(_Tp*, _Tp*, _Up*) [with _Tp = pybind11::detail::type_info* const; _Up = pybind11::detail::type_info*; bool _IsMove = false]',          inlined from '_OI std::__copy_move_a2(_II, _II, _OI) [with bool _IsMove = false; _II = pybind11::detail::type_info* const*; _OI = pybind11::detail::type_info**]' at /usr/lib/gcc/x86_64-pc-cygwin/12/include/c++/bits/stl_algobase.h:501:30,          inlined from '_OI std::__copy_move_a1(_II, _II, _OI) [with bool _IsMove = false; _II = pybind11::detail::type_info* const*; _OI = pybind11::detail::type_info**]' at /usr/lib/gcc/x86_64-pc-cygwin/12/include/c++/bits/stl_algobase.h:528:42,          inlined from '_OI std::__copy_move_a(_II, _II, _OI) [with bool _IsMove = false; _II = pybind11::detail::type_info* const*; _OI = pybind11::detail::type_info**]' at /usr/lib/gcc/x86_64-pc-cygwin/12/include/c++/bits/stl_algobase.h:535:31,          inlined from '_OI std::copy(_II, _II, _OI) [with _II = pybind11::detail::type_info* const*; _OI = pybind11::detail::type_info**]' at /usr/lib/gcc/x86_64-pc-cygwin/12/include/c++/bits/stl_algobase.h:626:7,          inlined from 'static _ForwardIterator std::__uninitialized_copy<true>::__uninit_copy(_InputIterator, _InputIterator, _ForwardIterator) [with _InputIterator = pybind11::detail::type_info* const*; _ForwardIterator = pybind11::detail::type_info**]' at /usr/lib/gcc/x86_64-pc-cygwin/12/include/c++/bits/stl_uninitialized.h:147:27,          inlined from '_ForwardIterator std::uninitialized_copy(_InputIterator, _InputIterator, _ForwardIterator) [with _InputIterator = pybind11::detail::type_info* const*; _ForwardIterator = pybind11::detail::type_info**]' at /usr/lib/gcc/x86_64-pc-cygwin/12/include/c++/bits/stl_uninitialized.h:185:15,          inlined from '_ForwardIterator std::__uninitialized_copy_a(_InputIterator, _InputIterator, _ForwardIterator, allocator<_Tp>&) [with _InputIterator = pybind11::detail::type_info* const*; _ForwardIterator = pybind11::detail::type_info**; _Tp = pybind11::detail::type_info*]' at /usr/lib/gcc/x86_64-pc-cygwin/12/include/c++/bits/stl_uninitialized.h:372:37,          inlined from 'void std::vector<_Tp, _Alloc>::_M_assign_aux(_ForwardIterator, _ForwardIterator, std::forward_iterator_tag) [with _ForwardIterator = pybind11::detail::type_info* const*; _Tp = pybind11::detail::type_info*; _Alloc = std::allocator<pybind11::detail::type_info*>]' at /usr/lib/gcc/x86_64-pc-cygwin/12/include/c++/bits/vector.tcc:339:35,          inlined from 'std::vector<_Tp, _Alloc>& std::vector<_Tp, _Alloc>::operator=(std::initializer_list<_Tp>) [with _Tp = pybind11::detail::type_info*; _Alloc = std::allocator<pybind11::detail::type_info*>]' at /usr/lib/gcc/x86_64-pc-cygwin/12/include/c++/bits/stl_vector.h:787:21,          inlined from 'pybind11::detail::generic_type::initialize(const pybind11::detail::type_record&)::<lambda(pybind11::detail::internals&)>' at /usr/local/lib/python3.9/site-packages/pybind11/include/pybind11/pybind11.h:1434:75,          inlined from 'decltype (cb(pybind11::detail::get_internals())) pybind11::detail::with_internals(const F&) [with F = generic_type::initialize(const pybind11::detail::type_record&)::<lambda(internals&)>]' at /usr/local/lib/python3.9/site-packages/pybind11/include/pybind11/detail/../detail/internals.h:626:14,          inlined from 'void pybind11::detail::generic_type::initialize(const pybind11::detail::type_record&)' at /usr/local/lib/python3.9/site-packages/pybind11/include/pybind11/pybind11.h:1426:23:      /usr/lib/gcc/x86_64-pc-cygwin/12/include/c++/bits/stl_algobase.h:434:30: error: 'void* __builtin_memcpy(void*, const void*, long unsigned int)' forming offset 8 is out of the bounds [0, 8] of object '<anonymous>' with type 'pybind11::detail::type_info* const [1]' [-Werror=array-bounds]        434 |             __builtin_memmove(__result, __first, sizeof(_Tp) * _Num);            |             ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~      /usr/local/lib/python3.9/site-packages/pybind11/include/pybind11/pybind11.h: In member function 'void pybind11::detail::generic_type::initialize(const pybind11::detail::type_record&)':      /usr/local/lib/python3.9/site-packages/pybind11/include/pybind11/pybind11.h:1434:75: note: '<anonymous>' declared here       1434 |             internals.registered_types_py[(PyTypeObject *) m_ptr] = {tinfo};            |                                                                           ^      cc1plus: all warnings being treated as errors      ninja: build stopped: subcommand failed.      [end of output]

Expected outcome

Job compiles.

Additional information

Note that Cygwin is disabled onmain as we require Python 3.10 there and only 3.9 is available on Cygwin still.

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Matplotlib Version

v3.9.x branch

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git checkout

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