Objective-C code coverage: ignore files

I have an test setup in Xcode to generate code coverage while running my tests. (GCOV)

My project uses a library, but my coverage is going down because i do not cover all code in that library.

Now i want to ign开发者_运维知识库ore those files when the coverage files are generated. Is this possible? Or should i just delete the files after the test run with a shell script?