==== check1 ====
c++ -O2 -pipe   -MD -MP  -c /home/src/regress/misc/c++abi/nm1.C
nm -C nm1.o | fgrep witness | sort | sed -e 's/.* T witness_//' >nm1.out
diff -I 'OpenBSD' -u nm1.out /home/src/regress/misc/c++abi/nm1.ref