关于 was build for newer iOS version than being linked

This appears to be a known bug in Xcode 7.0 and 7.1B1 (bug #21813082).

As a temporary workaround, to suppress extensive warnings, the -w flag can be added to Build Settings -> Other Linker Flags:

Select your Project

Select your Target

Select "Build Settings" tab

Scroll down to "Linking"

Edit "Other Linker Flags" and add "-w"

I've only added this to the Debug build settings and inserted the following to the AppDelegate, just as reminder:

#ifdef DEBUG

#warning Linker warnings suppressed (-w in build settings)

#endif

This at least helps to quickly spot the real warnings instead of having the build results flooded with the same warning for every source (in my case 150+ warnings appeared).