title: adding -gnatp flag to a file/package in GPS
body: <p>I use Ada With GPS (GNAT Programming Studio). The flag &quot;-gnatp&quot; when building will ignore among others constraint errors.</p>
  <p>I know a way to add the flag to all the files, using Edit-&gt;Preferences-&gt;Build target.</p>
  <p>Is there a way to choose when the builder will this flag, meaning setting the flag to a file or a package?</p>