A commercial license would be required to distribute an app to another party without making the source code available.
GPL v3 does include a system library exception, which covers linking to closed-source system libraries. There are some more details and fine points in the following:
I think this needs to be clarified. The free GPL v3 license allows for internal development, testing, and distribution within an organization (http://www.gnu.org/licenses/gpl-faq.html#InternalDistribution). This would be consistent with the Apple Developer Enterprise program (https://developer.apple.com/programs/enterprise/).
A commercial license would be required to distribute an app to another party without making the source code available.
GPL v3 does include a system library exception, which covers linking to closed-source system libraries. There are some more details and fine points in the following: