test failures with python-3.11

[bdubbs]

With Python 3.11.1, the latest stable version, 20 of the boost-1.81.0 regression tests fail. The build procedure used:

./bootstrap.sh --prefix=/usr --with-python=python3 &&
./b2 stage -j4 threading=multi link=shared

Then when running tests:

cd tools/build/test
python3 test_all.py

There are 20 failures like:

core_at_file :FAILED
failure {{{
Could not open '/tmp/tmpb3hkhs8t/on1n2 .txt'
}}}
changes caused by the last build command {{{
Added files : ['on1n2 .txt']
Removed files : []
Modified files: []
Touched files : []
}}}
STDOUT {{{
file: on1n2 .txt
}}}
STDERR {{{
}}}
stacktrace {{{
at line 636 of /build/boost/boost_1_81_0/tools/build/test/BoostBuild.py (fail_test)
from line 590 of /build/boost/boost_1_81_0/tools/build/test/BoostBuild.py (__read)
from line 595 of /build/boost/boost_1_81_0/tools/build/test/BoostBuild.py (read)
from line 775 of /build/boost/boost_1_81_0/tools/build/test/BoostBuild.py (expect_content)
from line 23 of /build/boost/boost_1_81_0/tools/build/test/core_at_file.py ()
from line 241 of (_call_with_frames_removed)
from line 940 of (exec_module)
from line 690 of (_load_unlocked)
from line 1149 of (_find_and_load_unlocked)
from line 1178 of (_find_and_load)
from line 62 of /build/boost/boost_1_81_0/tools/build/test/test_all.py (run_tests)
from line 373 of /build/boost/boost_1_81_0/tools/build/test/test_all.py ()
}}}

With python 3.10 (or python2), all tests pass.

[pyrophorol]

looks to be fixed with boostorg/build@75bfba8 (though I haven't tried building 1.83.0, but with 1.81.0 if I add that sys.version_info check for adding "U" to openMode those 20 errors don't come anymore)

[bdubbs]

Looks good. Closing.