The netgen code is incorrect, and now pybind detects the problem and rejects the code:
[ 108s] In file included from /home/abuild/rpmbuild/BUILD/netgen-6.2.2602-build/netgen-6.2.2602/libsrc/core/python_ngcore.hpp:5:
[ 108s] /usr/include/pybind11/pybind11.h: In instantiation of ‘pybind11::class_<type_, options>& pybind11::class_<type_, options>::def_property_static(const char*, const pybind11::cpp_function&, const pybind11::cpp_function&, const Extra& ...) [with Extra = {pybind11::is_method, pybind11::return_value_policy, pybind11::keep_alive<0, 1>}; type_ = netgen::Mesh; options = {std::shared_ptr<netgen::Mesh>}]’:
[ 108s] /usr/include/pybind11/pybind11.h:2438:35: required from ‘pybind11::class_<type_, options>& pybind11::class_<type_, options>::def_property(const char*, const pybind11::cpp_function&, const pybind11::cpp_function&, const Extra& ...) [with Extra = {pybind11::return_value_policy, pybind11::keep_alive<0, 1>}; type_ = netgen::Mesh; options = {std::shared_ptr<netgen::Mesh>}]’
[ 108s] 2438 | return def_property_static(name, fget, fset, is_method(*this), extra...);
[ 108s] | ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[ 108s] /usr/include/pybind11/pybind11.h:2417:28: required from ‘pybind11::class_<type_, options>& pybind11::class_<type_, options>::def_property(const char*, const Getter&, const Setter&, const Extra& ...) [with Getter = pybind11::cpp_function; Setter = std::nullptr_t; Extra = {pybind11::return_value_policy, pybind11::keep_alive<0, 1>}; type_ = netgen::Mesh; options = {std::shared_ptr<netgen::Mesh>}]’
[ 108s] 2417 | return def_property(
[ 108s] | ~~~~~~~~~~~~^
[ 108s] 2418 | name, fget, cpp_function(method_adaptor<type>(fset), is_setter()), extra...);
[ 108s] | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[ 108s] /usr/include/pybind11/pybind11.h:2394:28: required from ‘pybind11::class_<type_, options>& pybind11::class_<type_, options>::def_property_readonly(const char*, const pybind11::cpp_function&, const Extra& ...) [with Extra = {pybind11::return_value_policy, pybind11::keep_alive<0, 1>}; type_ = netgen::Mesh; options = {std::shared_ptr<netgen::Mesh>}]’
[ 108s] 2394 | return def_property(name, fget, nullptr, extra...);
[ 108s] | ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[ 108s] /usr/include/pybind11/pybind11.h:2384:37: required from ‘pybind11::class_<type_, options>& pybind11::class_<type_, options>::def_property_readonly(const char*, const Getter&, const Extra& ...) [with Getter = ExportNetgenMeshing(pybind11::module&)::<lambda(netgen::Mesh&)>; Extra = {pybind11::keep_alive<0, 1>}; type_ = netgen::Mesh; options = {std::shared_ptr<netgen::Mesh>}]’
[ 108s] 2384 | return def_property_readonly(name,
[ 108s] | ~~~~~~~~~~~~~~~~~~~~~^~~~~~
[ 108s] 2385 | cpp_function(method_adaptor<type>(fget)),
[ 108s] | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[ 108s] 2386 | return_value_policy::reference_internal,
[ 108s] | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[ 108s] 2387 | extra...);
[ 108s] | ~~~~~~~~~
[ 108s] /home/abuild/rpmbuild/BUILD/netgen-6.2.2602-build/netgen-6.2.2602/libsrc/meshing/python_mesh.cpp:975:27: required from here
[ 108s] 734 | py::class_<Mesh,shared_ptr<Mesh>>(m, "Mesh")
[ 108s] | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
...
[ 108s] /usr/include/pybind11/pybind11.h:2462:25: error: static assertion failed: def_property family does not currently support keep_alive. Use a py::cpp_function instead.
[ 108s] 2462 | static_assert(0 == detail::constexpr_sum(detail::is_keep_alive<Extra>::value...),
[ 108s] | ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[ 108s] /usr/include/pybind11/pybind11.h:2462:25: note: the comparison reduces to ‘(0 == 1)’
[ 108s] make[2]: *** [CMakeFiles/nglib.dir/build.make:1111: CMakeFiles/nglib.dir/libsrc/meshing/python_mesh.cpp.o] Error 1
The netgen code is incorrect, and now pybind detects the problem and rejects the code:
pybind/pybind11#5533