unite-quickfixをインストールして.vimrcに
let g:syntastic_always_populate_loc_list=1
を書くだけ.
:Unite location_list
で表示されるよ!
*'syntastic_always_populate_loc_list'*
Default: 0
Enable this option to tell syntastic to always stick any detected errors into the loclist:
>
let g:syntastic_always_populate_loc_list=1
<
とのこと.