title: How to ignore Make output at quickfix in vim?
body: <p>What is the desired behaviour of vim's quickfix feature?
  Should the quickfix window (:copen) only contain compiler errors/warnings or should the whole output be displayed?
  I want the former, since the output of make can be very long, but I get the latter, even with compiler set to gcc and g:compiler_gcc_ignore_unmatched_lines set.
  However, lines inside the quickfix window with warnings/errors are highlighted and :cnext correctly jumps to the next issue.
  Furthermore, Lines without issues have a double pipe symbol prefixed, so it seems that vim properly parses the make output.</p>
  
  <p>Are these lines displayed in addition to the warnings/errors and can be hidden or does the errorformat string not exactly match the make output?</p>
  
  <p>I used the avrdude 5.11.1 sources as an example, but I get the same result with many other projects.</p>
  
  <p>Does setting the compiler automatically adapt the errorformat string or do I have to set that string always manually?</p>
  
  <p>Thanks</p>