XCode 6.0.1 is a valid architecture issue; GTLFramework

I am using googleDriveSDK in my application and it compiles fine for xCode 5.1. Build settings:

architecture : armv7 and armv7s

valid architecture : armv7 , armv7s,armv 64.

But in xCode 6.0.1 the assembly gives a linker error. He says GTL frameworks are not available for armv 7s / 64. so I had to change the settings for xCode 6 as

architecture armv7

 and valid architecture : armv7 , armv7s,armv 64.

now it works fine. I tested it on version 5.5s, 5c. But I wonder what happens if I save ARCHS armv7 and VALID ARCHS armv7 armv7s armv64 in build settings? I am confused between what are arches and actual arches.

Am I missing something?