With XCode7, after selecting "Text" from the project menu, I am getting a bunch of these messages:
profiling: /ProjectRoot/ObjectiveC.gcda: cannot merge previous GCDA file: corrupt arc tag (0x00000010)
profiling: /ProjectRoot/ObjectiveC.gcda: cannot merge previous GCDA file: corrupt arc tag (0x00000002)
profiling: /ProjectRoot/ObjectiveC.gcda: cannot merge previous GCDA file: corrupt arc tag (0x2b90598d)
profiling: /ProjectRoot/ObjectiveC.gcda: cannot merge previous GCDA file: corrupt arc tag (0x0000005f)
......... many, many, more.....
Delettig the *.gcda files form the project directory has no effect (they re-appear after the tests are completed).
Turning code coverage off has no effect