As a special exception, if other files instantiate generics from this unit, or you link this unit with other files to produce an executable, this unit does not by itself cause the resulting executable to be covered by the GNU General Public License. This exception does not however invalidate any other reasons why the executable file might be covered by the GNU Public License.
The GNAT Ada compiler can automate conformance checks for some GPL software license issues via a compiler directive. (Use pragma License (Modified_GPL); to activate the check against the Modified GPL. The GNAT Reference Manual  documents the License  pragma along with other compiler directives.