How to exclude file patterns in vimgrep?

As of Vim 7.3.570, you can use wildignore to exclude patterns with vimgrep.

For example, to ignore the objd subfolder:

:set wildignore+=objd/**

Additional exclusions can be added by separating patterns with a comma:

:set wildignore+=objd/**,obj/**,*.tmp,test.c

See Vim’s help documentation for a few more details.

:help wildignore