[Bug 292071] boost-libs: make boost type_traits build with clang 21
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Date: Thu, 01 Jan 2026 02:07:15 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=292071
--- Comment #7 from commit-hook@FreeBSD.org ---
A commit in branch main references this bug:
URL:
https://cgit.FreeBSD.org/ports/commit/?id=ab934769498d910cfb2e9e6493dd1fedc3cbc5f7
commit ab934769498d910cfb2e9e6493dd1fedc3cbc5f7
Author: Dimitry Andric <dim@FreeBSD.org>
AuthorDate: 2025-12-31 14:13:21 +0000
Commit: Dimitry Andric <dim@FreeBSD.org>
CommitDate: 2026-01-01 02:05:54 +0000
boost-libs: make boost type_traits build with clang 21
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
devel/boost-libs/Makefile | 2 +-
.../patch-boost_type__traits_is__signed.hpp (new) | 48 ++++++++++++++++++++++
...patch-boost_type__traits_is__unsigned.hpp (new) | 42 +++++++++++++++++++
3 files changed, 91 insertions(+), 1 deletion(-)
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