Xcode4 Linking Problem. File was built for archive which is not the architecture being linked (arm6)

Question

Recently, I switched to Xcode4 and when I compile my project I got following error.

ld: warning: ignoring file /Users/myname/Library/Developer/Xcode/DerivedD         


        

Answer 1

I fixed this problem thanks to another thread where they show that armv6/armv7 is actually a little different than what you think it is: Upgrading to xcode 4 error No architectures to compile for