unable to use boost::flat_map with std::chrono::year_month_day

[ingo-loehken]

maybe a combination of is_trivially_copyable & is_standard_layout can do the same job as deprecated is_pod and do not break the builds ?

Build Output, msvc latest,

boost\1.90.0\include\boost\move\detail\type_traits.hpp(903,30): error C4647: behavior change: __is_pod(std::chrono::year_month_day) has different value in previous versions
1>(compiling source file '/GetVersionDate.cpp')
1>    boost\1.90.0\include\boost\move\detail\type_traits.hpp(903,30):
1>    the template instantiation context (the oldest one first) is
1>        GetVersionDate.cpp(44,65):
1>        see reference to class template instantiation 'boost::container::flat_map<std::string,std::chrono::year_month_day,std::less<Key>,void>' being compiled
1>        with
1>        [
1>            Key=std::string
1>        ]
1>        boost\1.90.0\include\boost\container\flat_map.hpp(178,16):
1>        see reference to class template instantiation 'boost::container::dtl::flat_tree<std::pair<Key,T>,boost::container::dtl::select1st<Key>,Compare,AllocatorOrContainer>' being compiled
1>        with
1>        [
1>            Key=std::string,
1>            T=std::chrono::year_month_day,
1>            Compare=std::less<std::string>,
1>            AllocatorOrContainer=void
1>        ]
1>        boost\1.90.0\include\boost\container\detail\flat_tree.hpp(508,37):
1>        see reference to class template instantiation 'boost::container::vector<Value,AllocatorOrVoid,void>' being compiled
1>        with
1>        [
1>            Value=std::pair<std::string,std::chrono::year_month_day>,
1>            AllocatorOrVoid=void
1>        ]
1>        boost\1.90.0\include\boost\container\vector.hpp(1213,5):
1>        while compiling class template member function 'boost::container::vector<Value,AllocatorOrVoid,void>::~vector(void) noexcept'
1>        with
1>        [
1>            Value=std::pair<std::string,std::chrono::year_month_day>,
1>            AllocatorOrVoid=void
1>        ]
1>            boost\1.90.0\include\boost\container\detail\flat_tree.hpp(577,1):
1>            see the first reference to 'boost::container::vector<Value,AllocatorOrVoid,void>::~vector' in 'boost::container::dtl::flat_tree<std::pair<Key,T>,boost::container::dtl::select1st<Key>,Compare,AllocatorOrContainer>::Data::~Data'
1>        with
1>        [
1>            Value=std::pair<std::string,std::chrono::year_month_day>,
1>            AllocatorOrVoid=void
1>        ]
1>        and
1>        [
1>            Key=std::string,
1>            T=std::chrono::year_month_day,
1>            Compare=std::less<std::string>,
1>            AllocatorOrContainer=void
1>        ]
1>        boost\1.90.0\include\boost\container\vector.hpp(1215,25):
1>        see reference to function template instantiation 'dtl::enable_if_trivially_destructible<I,void>::type boost::container::destroy_alloc_n(Allocator &,I,size_t)' being compiled
1>        boost\1.90.0\include\boost\container\vector.hpp(1215,25):
1>        see reference to class template instantiation 'boost::container::dtl::enable_if_trivially_destructible<T *,void>' being compiled
1>        with
1>        [
1>            T=std::pair<std::string,std::chrono::year_month_day>
1>        ]
1>        lug.boost\1.90.0\include\boost\container\detail\copy_move_algo.hpp(320,69):
1>        see reference to class template instantiation 'boost::move_detail::is_trivially_destructible<std::pair<Key,T>>' being compiled
1>        with
1>        [
1>            Key=std::string,
1>            T=std::chrono::year_month_day
1>        ]
1>        boost\1.90.0\include\boost\container\detail\pair.hpp(641,6):
1>        see reference to class template instantiation 'boost::move_detail::is_trivially_destructible<boost::container::dtl::pair<Key,T>>' being compiled
1>        with
1>        [
1>            Key=std::string,
1>            T=std::chrono::year_month_day
1>        ]
1>        boost\1.90.0\include\boost\container\detail\pair.hpp(636,90):
1>        see reference to class template instantiation 'boost::move_detail::is_trivially_destructible<B>' being compiled
1>        with
1>        [
1>            B=std::chrono::year_month_day
1>        ]
1>        boost\1.90.0\include\boost\move\detail\type_traits.hpp(1033,30):
1>        see reference to class template instantiation 'boost::move_detail::is_pod<T>' being compiled
1>        with
1>        [
1>            T=std::chrono::year_month_day
1>        ]
1>        boost\1.90.0\include\boost\move\detail\type_traits.hpp(907,6):
1>        see reference to class template instantiation 'boost::move_detail::is_pod_noextents_cv<std::chrono::year_month_day>' being compiled

I tried to reproduce the isseu with godbolt, but msvc could not find the header ?