In XCode 5.1, the default arch to build APP is arm64 included, so if you want to have 32-bit build only, steps:
Select on build project and open ARCH
Remove ‘Standard Architect‘
Add ‘amrv7‘
Add ‘amrv7s‘
Clean and build
Do 32-bit build only with XCode 5.1
原文：http://my.oschina.net/justdoit/blog/345568