All the build products in a normal build. One of the infelicities of git is that 'git status' shows the untracked files at the bottom. So if you have lots of unignored stuff floating around, the information about which files you've actually changed or added to the index scrolls right off the screen.
I have just started to read the thread, so don't know if somebody already chimed in.
You can avoid the above situation by adding the folowing to ~/.gitconfig or .git/config
[pager] status = true
I think I used `git config` command for this, but adding by hand would also do.