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Do not include spaces or tabs on blank lines or at the end of lines. Please ensure you remove all instances of these in any patches you submit to GerritGitHub. You can find them with grep or in vim using the following regexps /\[ \t\]$/ or use git git diff --check. Alternatively, if you use vim, you can put this line in your .vimrc file, which will highlight whitespace at the end of lines and spaces followed by tabs in indentation (only works for C/C++ files) let c_space_errors=1. Or you can use this command, which will make tabs and whitespace at the end of lines visible for all files (but a bit more discretely) set list listchars=tab:>\ ,trail:$. In emacs, you can use (whitespace-mode) or (whitespace-visual-mode)depending on the version. You could also consider using (flyspell-prog-mode).
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