Warnings with boost 1.91.0 and clang-21

Here’s the warnings counts (by standards level) from Boost. 1.90.0:
(Apple clang 17):
logs/clang11-build.txt:	34
logs/clang14-build.txt:	40
logs/clang17-build.txt:	40
logs/clang20-build.txt:	44
logs/clang23-build.txt:	48
logs/clang2c-build.txt:	48

Here are the same numbers from Boost 1.91.0
(Apple clang 21)
logs/clang11-build.txt:	79
logs/clang14-build.txt:	91
logs/clang17-build.txt	:91
logs/clang20-build.txt:	99
logs/clang23-build.txt:	103
logs/clang2c-build.txt:	3167


Most of the bugs fall into three bins:
	https://github.com/boostorg/proto/issues/37
	https://github.com/bfgroup/b2/issues/566

	And several libraries (at least regex and spirit) instantiate std::char_traits types that are not ‘characters’

Example:

/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/c++/v1/__fwd/string.h:45:41: warning: 'char_traits<unsigned char>' is deprecated: char_traits<T> for T not equal to char, wchar_t, char8_t, char16_t or char32_t is non-standard and is provided for a temporary period. It will be removed in a future release, so please migrate off of it. [-Wdeprecated-declarations]
   45 | template <class _CharT, class _Traits = char_traits<_CharT>, class _Allocator = allocator<_CharT> >
      |                                         ^
./boost/xpressive/traits/cpp_regex_traits.hpp:321:18: note: in instantiation of default argument for 'basic_string<char_type>' required here
  321 |     typedef std::basic_string<char_type> string_type;
      |                  ^~~~~~~~~~~~~~~~~~~~~~~
./boost/xpressive/traits/cpp_regex_traits.hpp:673:22: note: in instantiation of template class 'boost::xpressive::cpp_regex_traits<unsigned char>' requested here
  673 | inline unsigned char cpp_regex_traits<unsigned char>::hash(unsigned char ch)
      |                      ^

And 

/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/c++/v1/__fwd/string.h:45:41: warning: 'char_traits<unsigned int>' is deprecated: char_traits<T> for T not equal to char, wchar_t, char8_t, char16_t or char32_t is non-standard and is provided for a temporary period. It will be removed in a future release, so please migrate off of it. [-Wdeprecated-declarations]
   45 | template <class _CharT, class _Traits = char_traits<_CharT>, class _Allocator = allocator<_CharT> >
      |                                         ^
./boost/spirit/home/support/utf8.hpp:24:18: note: in instantiation of default argument for 'basic_string<ucs4_char>' required here
   24 |     typedef std::basic_string<ucs4_char> ucs4_string;
      |                  ^~~~~~~~~~~~~~~~~~~~~~~

— Marshall

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