boost-libs: make boost type_traits build with clang 21HEADmain

Recent versions of clang made -Wenum-constexpr-conversion errors into a
hard error, as was announced several versions ago.

Boost type_traits has two instances where it attempts to convert
out-of-range enum values, leading to errors similar to:

    In file included from ../src/lib/dhcpsrv/csv_lease_file6.cc:9:
    In file included from ../src/lib/dhcpsrv/dhcpsrv_log.h:11:
    In file included from ../src/lib/log/macros.h:10:
    In file included from ../src/lib/log/logger.h:19:
    In file included from ../src/lib/log/log_formatter.h:19:
    In file included from /usr/local/include/boost/lexical_cast.hpp:33:
    In file included from /usr/local/include/boost/lexical_cast/try_lexical_convert.hpp:31:
    In file included from /usr/local/include/boost/lexical_cast/detail/converter_numeric.hpp:31:
    In file included from /usr/local/include/boost/type_traits/make_unsigned.hpp:14:
    /usr/local/include/boost/type_traits/is_signed.hpp:37:25: error: in-class initializer for static data member is not a constant expression
       37 |    static const no_cv_t minus_one = (static_cast<no_cv_t>(-1));
          |                         ^           ~~~~~~~~~~~~~~~~~~~~~~~~~~
    /usr/local/include/boost/type_traits/is_signed.hpp:45:60: note: in instantiation of template class 'boost::detail::is_signed_values<isc::dhcp::Lease::Type>' requested here
       45 |    BOOST_STATIC_CONSTANT(bool, value = (!(::boost::detail::is_signed_values<T>::minus_one  > boost::detail::is_signed_values<T>::zero)));
          |                                                            ^
    /usr/local/include/boost/config/detail/suffix.hpp:410:72: note: expanded from macro 'BOOST_STATIC_CONSTANT'
      410 | #     define BOOST_STATIC_CONSTANT(type, assignment) static const type assignment
          |                                                                        ^
    /usr/local/include/boost/type_traits/is_signed.hpp:74:40: note: in instantiation of template class 'boost::detail::is_signed_helper<isc::dhcp::Lease::Type>' requested here
       74 |    BOOST_STATIC_CONSTANT(bool, value = type::value);
          |                                        ^
    /usr/local/include/boost/config/detail/suffix.hpp:410:72: note: expanded from macro 'BOOST_STATIC_CONSTANT'
      410 | #     define BOOST_STATIC_CONSTANT(type, assignment) static const type assignment
          |                                                                        ^
    /usr/local/include/boost/type_traits/is_signed.hpp:79:85: note: in instantiation of template class 'boost::detail::is_signed_impl<isc::dhcp::Lease::Type>' requested here
       79 | template <class T> struct is_signed : public integral_constant<bool, boost::detail::is_signed_impl<T>::value> {};
          |                                                                                     ^
    /usr/local/include/boost/lexical_cast/detail/converter_lexical_streams.hpp:315:44: note: in instantiation of template class 'boost::is_signed<isc::dhcp::Lease::Type>' requested here
      315 |         typename boost::enable_if_c<boost::is_signed<Type>::value && !boost::is_enum<Type>::value, bool>::type
          |                                            ^
    /usr/local/include/boost/lexical_cast/detail/converter_lexical.hpp:449:67: note: while substituting deduced template arguments into function template 'stream_in' [with Type = isc::dhcp::Lease::Type]
      449 |                 -> decltype(std::declval<optimized_src_stream&>().stream_in(std::declval<lcast::exact<T>>()), optimized_src_stream{});
          |                                                                   ^
    /usr/local/include/boost/lexical_cast/detail/converter_lexical.hpp:454:46: note: while substituting explicitly-specified template arguments into function template 'detect_type'
      454 |             using from_src_stream = decltype(detect_type<Source>(1));
          |                                              ^
    /usr/local/include/boost/lexical_cast/try_lexical_convert.hpp:67:20: note: in instantiation of template class 'boost::detail::lexical_converter_impl<std::string, isc::dhcp::Lease::Type>' requested here
       67 |             return caster_type::try_convert(arg, result);
          |                    ^
    /usr/local/include/boost/lexical_cast.hpp:42:41: note: in instantiation of function template specialization 'boost::conversion::detail::try_lexical_convert<std::string, isc::dhcp::Lease::Type>' requested here
       42 |         if (!boost::conversion::detail::try_lexical_convert(arg, result)) {
          |                                         ^
    ../src/lib/util/csv_file.h:243:34: note: in instantiation of function template specialization 'boost::lexical_cast<std::string, isc::dhcp::Lease::Type>' requested here
      243 |             values_[at] = boost::lexical_cast<std::string>(value);
          |                                  ^
    ../src/lib/dhcpsrv/csv_lease_file6.cc:54:9: note: in instantiation of function template specialization 'isc::util::CSVRow::writeAt<isc::dhcp::Lease::Type>' requested here
       54 |     row.writeAt(getColumnIndex("lease_type"), lease.type_);
          |         ^
    /usr/local/include/boost/type_traits/is_signed.hpp:37:38: note: integer value -1 is outside the valid range of values [0, 3] for the enumeration type 'Type'
       37 |    static const no_cv_t minus_one = (static_cast<no_cv_t>(-1));
          |                                      ^

This is while compiling net/kea, but other users of boost type traits
may also have the same issue.

There is an upstream bug report at:
https://github.com/boostorg/type_traits/issues/202

and an outstanding pull request at:
https://github.com/boostorg/type_traits/pull/199

Apply the latter as a diff, to work around the problem. Bump
PORTREVISION to make dependents recompile.

PR:		292071
Approved by:	fluffy (maintainer)
MFH:		2025Q4

0 files changed, 0 insertions, 0 deletions