[Bug 273585] walk_cb_call() prints warning polluting program output

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=273585

            Bug ID: 273585
           Summary: walk_cb_call() prints warning polluting program output
           Product: Base System
           Version: 13.2-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: misc
          Assignee: bugs@FreeBSD.org
          Reporter: mkrzewicki@gmail.com

walk_cb_call() from  /lib/libc/stdlib/cxa_thread_atexit_impl.c 
prints a warning at thread exit if the library that registered the action no
longer can be found, no further action is taken, the dtor is then skipped.
The additional output to stderr pollutes the output of binaries checked by e.g.
ctest, throwing the test suite off.
In my case the program is root (CERN's data analysis suite) which features a
C++ interpreter and does a lot of internal lib loading/unloading.

My question is: is this behaviour absolutely required? Or could the printout be
made optional; as in only there in some debug mode, or possibly steered by an
env variable? Patching libc may work for me for now, but would be harder to
justify in a larger prod environment.

thanks,
Mikolaj

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