Test -B output
test1:   Done
test2:   Done
test3:   Done
# Meta data file <tmpdir>/obj/output.meta
CMD @{ echo Test -B output;  for i in 1 2 3; do  echo -n "test$i:  "; sleep 0; echo " Done";  done; }
CWD <tmpdir>/obj
TARGET output
-- command output --
Test -B output
test1:   Done
test2:   Done
test3:   Done

Test -j1 output
test1:   Done
test2:   Done
test3:   Done
# Meta data file <tmpdir>/obj/output.meta
CMD @{ echo Test -j1 output;  for i in 1 2 3; do  echo -n "test$i:  "; sleep 0; echo " Done";  done; }
CWD <tmpdir>/obj
TARGET output
-- command output --
Test -j1 output
test1:   Done
test2:   Done
test3:   Done

exit status 0