can't link with a main executable file

Question

Changed my deployment target to from 8.0 to 7.0.

Using Xcode 6 with latest iOS8 as base sdk. Getting this error when building for iOS7.1 device:

ld: can't link with a main executable file '/Users/Name/Library/Developer/Xcode/DerivedData/Clumsy_Bird-gotvuaeuyvrkzvfqpzsuxpmifimu/Build/Products/Debug-iphoneos/Clumsy Bird.app/Clumsy Bird' for architecture armv7 clang: error: linker command failed with exit code 1 (use -v to see invocation)

How to solve this?

Answer 1

1. Click your project in Navigator.
2. Select your test target. Switch to general tab if not there.
3. Select your application name from Host Application dropdown.

Answer 2

I had a mismatch in values between on "Build Active Architecture Only" which was "Yes" for my test app, but "No" for my unit test target. Make sure these values are identical.