> Actually, test results don't change at all. However, software that otherwise fails to build with "Cannot find an intrinsic module named 'ieee_arithmetic'", now builds successfully.

Test results should definitely change, we’d need to see a before/after list (same build, same revision, without and with patch applied) to know. Run “make check-gfortran”.

All tests in gcc/testsuite/gfortran.dg/ieee/ should be running and running fine (i.e., PASS). You can also grep for “ieee” in the gcc/testsuite/gfortran.sum file created after “make check-gfortran” is run, and report both here. This will help investigate.

Thanks,
FX