boost1{76..80}: +clang16 doesn't build

[blair (Blair Zajac)]

Trying to build boost176 +clang16 fails:

In file included from libs/python/src/converter/builtin_converters.cpp:21:
In file included from ./boost/cast.hpp:18:
In file included from ./boost/numeric/conversion/cast.hpp:33:
In file included from ./boost/numeric/conversion/converter.hpp:13:
In file included from ./boost/numeric/conversion/conversion_traits.hpp:13:
In file included from ./boost/numeric/conversion/detail/conversion_traits.hpp:18:
In file included from ./boost/numeric/conversion/detail/int_float_mixture.hpp:19:
In file included from ./boost/mpl/integral_c.hpp:32:
./boost/mpl/aux_/integral_wrapper.hpp:73:31: error: integer value -1 is outside the valid range of values [0, 3] for this enumeration type [-Wenum-constexpr-conversion]
    typedef AUX_WRAPPER_INST( BOOST_MPL_AUX_STATIC_CAST(AUX_WRAPPER_VALUE_TYPE, (value - 1)) ) prior;
                              ^

Building with the +clang15 variant compiles fine.

Any suggestions?

[sambthompson (Sam Thompson)]

Found this issue as well when rebuilding mkvtoolnix after the changes discussed in ticket:65895. Relates to a bug fix applied to clang-16 and later, discussed here: ​https://github.com/llvm/llvm-project/issues/50055

Fixed it by cherry-picking this commit ​https://github.com/boostorg/numeric_conversion/commit/50a1eae942effb0a9b90724323ef8f2a67e7984a to the boost176 installation, found on Boost's version of this issue at ​https://github.com/boostorg/mpl/issues/69. This fix didn't land until Boost 1.81, so probably needs application to versions 1.77 thru 1.80 as well if clang16 support is wanted for these earlier versions.

For mkvtoolnix, I also needed the fix for BOOST_NO_CXX98_FUNCTION_BASE found in ​https://github.com/boostorg/config/pull/440, which related to this issue: ​https://github.com/boostorg/container_hash/issues/24. This also didn't land until 1.81.

[sambthompson (Sam Thompson)]

patch file to meet c++17 compliance enforcement of deprecations in clang16

[Christopher Nielsen <mascguy@…>]

In f84fa6745d9d0f9e15b80e384e315e828539ec73/macports-ports (master):

boost1{76..80}: add upstream patch for clang16/cxx17
Fixes: #67324

[chrstphrchvz (Christopher Chavez)]

In 7c8b67b176e40af955155b989241842500d79f5c/macports-ports (master):

mysql8, mysql81: fix LLVM Clang 16 build

See: #67324