Compiler warning about undeclared string length in python interface

[smoe]

A reminder.

In file included from /usr/include/c++/15/string:56,
                 from /usr/include/c++/15/bits/locale_classes.h:42,
                 from /usr/include/c++/15/bits/ios_base.h:43,
                 from /usr/include/c++/15/ios:46,
                 from /usr/include/c++/15/bits/ostream.h:43,
                 from /usr/include/c++/15/bits/unique_ptr.h:42,
                 from /usr/include/c++/15/memory:80,
                 from /usr/include/boost/config/no_tr1/memory.hpp:21,
                 from /usr/include/boost/get_pointer.hpp:14,
                 from /usr/include/boost/python/object/pointer_holder.hpp:11,
                 from /usr/include/boost/python/to_python_indirect.hpp:10,
                 from /usr/include/boost/python/converter/arg_to_python.hpp:10,
                 from /usr/include/boost/python/call.hpp:15,
                 from /usr/include/boost/python/object_core.hpp:14,
                 from /usr/include/boost/python/object.hpp:9,
                 from emc/pythonplugin/python_plugin.hh:25,
                 from emc/rs274ngc/interp_python.cc:20:
In member function ‘constexpr std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size() const [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’,
    inlined from ‘constexpr std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::length() const [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’ at /usr/include/c++/15/bits/basic_string.h:1176:20,
    inlined from ‘constexpr std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’ at /usr/include/c++/15/bits/basic_string.h:617:20,
    inlined from ‘std::string handle_pyerror()’ at emc/rs274ngc/interp_python.cc:68:54:
/usr/include/c++/15/bits/basic_string.h:1165:19: warning: ‘*(const std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*)((char*)&<unnamed> + offsetof(boost::python::extract<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >,boost::python::extract<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >::<unnamed>.boost::python::converter::extract_rvalue<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >::m_data.boost::python::converter::rvalue_from_python_data<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >::<unnamed>.boost::python::converter::rvalue_from_python_storage<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >::storage)).std::__cxx11::basic_string<char>::_M_string_length’ may be used uninitialized [-Wmaybe-uninitialized]
 1165 |         size_type __sz = _M_string_length;
      |                   ^~~~
emc/rs274ngc/interp_python.cc: In function ‘std::string handle_pyerror()’:
emc/rs274ngc/interp_python.cc:68:54: note: ‘<anonymous>’ declared here
   68 |         return bp::extract<std::string>(bp::str(hexc));
      |                                                      ^
In member function ‘constexpr std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size() const [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’,
    inlined from ‘constexpr std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::length() const [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’ at /usr/include/c++/15/bits/basic_string.h:1176:20,
    inlined from ‘constexpr std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’ at /usr/include/c++/15/bits/basic_string.h:617:20,
    inlined from ‘std::string handle_pyerror()’ at emc/rs274ngc/interp_python.cc:79:46:
/usr/include/c++/15/bits/basic_string.h:1165:19: warning: ‘*(const std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*)((char*)&<unnamed> + offsetof(boost::python::extract<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >,boost::python::extract<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >::<unnamed>.boost::python::converter::extract_rvalue<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >::m_data.boost::python::converter::rvalue_from_python_data<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >::<unnamed>.boost::python::converter::rvalue_from_python_storage<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >::storage)).std::__cxx11::basic_string<char>::_M_string_length’ may be used uninitialized [-Wmaybe-uninitialized]
 1165 |         size_type __sz = _M_string_length;
      |                   ^~~~
emc/rs274ngc/interp_python.cc: In function ‘std::string handle_pyerror()’:
emc/rs274ngc/interp_python.cc:79:46: note: ‘<anonymous>’ declared here
   79 |     return bp::extract<std::string>(formatted);

[smoe]

Also

Compiling realtime objects/hal/components/match8.c
In file included from /usr/include/c++/15/string:56,
                 from /usr/include/c++/15/bits/locale_classes.h:42,
                 from /usr/include/c++/15/bits/ios_base.h:43,
                 from /usr/include/c++/15/ios:46,
                 from /usr/include/c++/15/bits/ostream.h:43,
                 from /usr/include/c++/15/bits/unique_ptr.h:42,
                 from /usr/include/c++/15/memory:80,
                 from /usr/include/boost/config/no_tr1/memory.hpp:21,
                 from /usr/include/boost/get_pointer.hpp:14,
                 from /usr/include/boost/python/object/pointer_holder.hpp:11,
                 from /usr/include/boost/python/to_python_indirect.hpp:10,
                 from /usr/include/boost/python/converter/arg_to_python.hpp:10,
                 from /usr/include/boost/python/call.hpp:15,
                 from /usr/include/boost/python/object_core.hpp:14,
                 from /usr/include/boost/python/object.hpp:9,
                 from emc/pythonplugin/python_plugin.hh:25,
                 from emc/rs274ngc/rs274ngc_pre.cc:69:
In member function ‘constexpr std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size() const [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’,
    inlined from ‘constexpr std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::length() const [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’ at /usr/include/c++/15/bits/basic_string.h:1176:20,
    inlined from ‘constexpr std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’ at /usr/include/c++/15/bits/basic_string.h:617:20,
    inlined from ‘virtual int Interp::init()’ at emc/rs274ngc/rs274ngc_pre.cc:1282:58:
/usr/include/c++/15/bits/basic_string.h:1165:19: warning: ‘*(const std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*)((char*)&<unnamed> + offsetof(boost::python::extract<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >,boost::python::extract<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >::<unnamed>.boost::python::converter::extract_rvalue<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >::m_data.boost::python::converter::rvalue_from_python_data<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >::<unnamed>.boost::python::converter::rvalue_from_python_storage<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >::storage)).std::__cxx11::basic_string<char>::_M_string_length’ may be used uninitialized [-Wmaybe-uninitialized]
 1165 |         size_type __sz = _M_string_length;
      |                   ^~~~
emc/rs274ngc/rs274ngc_pre.cc: In member function ‘virtual int Interp::init()’:
emc/rs274ngc/rs274ngc_pre.cc:1282:65: note: ‘<anonymous>’ declared here
 1282 |               std::string key = bp::extract<std::string>(keys[i]);
      |                 

and

Linking ../rtlib/limit2.so
In file included from /usr/include/c++/15/string:56,
                 from /usr/include/c++/15/bits/locale_classes.h:42,
                 from /usr/include/c++/15/bits/ios_base.h:43,
                 from /usr/include/c++/15/ios:46,
                 from /usr/include/c++/15/bits/ostream.h:43,
                 from /usr/include/c++/15/bits/unique_ptr.h:42,
                 from /usr/include/c++/15/memory:80,
                 from /usr/include/boost/config/no_tr1/memory.hpp:21,
                 from /usr/include/boost/get_pointer.hpp:14,
                 from /usr/include/boost/python/object/pointer_holder.hpp:11,
                 from /usr/include/boost/python/to_python_indirect.hpp:10,
                 from /usr/include/boost/python/converter/arg_to_python.hpp:10,
                 from /usr/include/boost/python/call.hpp:15,
                 from /usr/include/boost/python/object_core.hpp:14,
                 from /usr/include/boost/python/object.hpp:9,
                 from emc/rs274ngc/pyinterp1.cc:23:
In member function ‘constexpr std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size() const [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’,
    inlined from ‘constexpr std::__cxx11::basic_string<_CharT, _Traits, _Alloc>& std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::append(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’ at /usr/include/c++/15/bits/basic_string.h:1536:28,
    inlined from ‘constexpr std::__cxx11::basic_string<_CharT, _Traits, _Alloc>& std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::operator+=(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]’ at /usr/include/c++/15/bits/basic_string.h:1478:28,
    inlined from ‘static void boost::python::map_indexing_suite<Container, NoProxy, DerivedPolicies>::extension_def(Class&) [with Class = boost::python::class_<std::map<const char*, remap_struct, nocase_cmp>, boost::noncopyable_::noncopyable>; Container = std::map<const char*, remap_struct, nocase_cmp>; bool NoProxy = false; DerivedPolicies = boost::python::detail::final_map_derived_policies<std::map<const char*, remap_struct, nocase_cmp>, false>]’ at /usr/include/boost/python/suite/indexing/map_indexing_suite.hpp:77:23:
/usr/include/c++/15/bits/basic_string.h:1165:19: warning: ‘*(const std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*)((char*)&class_name_extractor + offsetof(boost::python::extract<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >,boost::python::extract<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >::<unnamed>.boost::python::converter::extract_rvalue<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >::m_data.boost::python::converter::rvalue_from_python_data<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >::<unnamed>.boost::python::converter::rvalue_from_python_storage<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >::storage)).std::__cxx11::basic_string<char>::_M_string_length’ may be used uninitialized [-Wmaybe-uninitialized]
 1165 |         size_type __sz = _M_string_length;
      |                   ^~~~
In file included from emc/rs274ngc/pyinterp1.cc:24:
/usr/include/boost/python/suite/indexing/map_indexing_suite.hpp: In static member function ‘static void boost::python::map_indexing_suite<Container, NoProxy, DerivedPolicies>::extension_def(Class&) [with Class = boost::python::class_<std::map<const char*, remap_struct, nocase_cmp>, boost::noncopyable_::noncopyable>; Container = std::map<const char*, remap_struct, nocase_cmp>; bool NoProxy = false; DerivedPolicies = boost::python::detail::final_map_derived_policies<std::map<const char*, remap_struct, nocase_cmp>, false>]’:
/usr/include/boost/python/suite/indexing/map_indexing_suite.hpp:76:34: note: ‘class_name_extractor’ declared here
   76 |             extract<std::string> class_name_extractor(class_name);
      |