Similar to bug 272295, building databases/mysql80-server with clang 16
or higher can result in an error:
/wrkdirs/usr/ports/databases/mysql80-server/work/mysql-8.0.35/boost/boost_1_77_0/boost/mpl/aux_/integral_wrapper.hpp:73:31: error: integer value -1 is outside the valid range of values [0, 3] for the enumeration type 'udt_builtin_mixture_enum' [-Wenum-constexpr-conversion]
73 | typedef AUX_WRAPPER_INST( BOOST_MPL_AUX_STATIC_CAST(AUX_WRAPPER_VALUE_TYPE, (value - 1)) ) prior;
| ^
/wrkdirs/usr/ports/databases/mysql80-server/work/mysql-8.0.35/boost/boost_1_77_0/boost/mpl/aux_/static_cast.hpp:24:47: note: expanded from macro 'BOOST_MPL_AUX_STATIC_CAST'
24 | # define BOOST_MPL_AUX_STATIC_CAST(T, expr) static_cast<T>(expr)
| ^
This is because the vendored copy of boost in mysql80-server is using
undefined behavior in a possibly constexpr context.
Fix this by unconditionally enabling the "boost workaround" for aux
wrapper value types in integral_wrapper.hpp.
PR: 276749
Approved by: joneum (maintainer)
MFH: 2024Q1
