[Bug 282329] Many ports started to fail with: error: implicit instantiation of undefined template 'std::char_traits<unsigned char>'

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=282329

            Bug ID: 282329
           Summary: Many ports started to fail with: error: implicit
                    instantiation of undefined template
                    'std::char_traits<unsigned char>'
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: misc
          Assignee: bugs@FreeBSD.org
          Reporter: yuri@freebsd.org

Examples:
* audio/opustags:
https://pkg-status.freebsd.org/beefy18/data/main-amd64-default/p645a502a4f60_s8b2e7da7085/logs/opustags-1.10.1.log
* www/dpp:
https://pkg-status.freebsd.org/beefy18/data/main-amd64-default/p645a502a4f60_s8b2e7da7085/logs/dpp-discord-10.0.29_1.log
* misc/ola:
https://pkg-status.freebsd.org/beefy18/data/main-amd64-default/p645a502a4f60_s8b2e7da7085/logs/ola-0.10.9_7.log

There are many other examples.

Many C++ ports that were successful started to fail recently with various other
C++ errors that didn't happen before.
The amount of fallout increased significantly.

Perhaps there problems in C++ libraries or compiler?

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