I have a small prefix header file
#ifndef UP_FOR_IT_PrefixHeader_pch
#define UP_FOR_IT_PrefixHeader_pch
#ifdef __OBJC__
#import
#
Goto Build Settings > Apple LLVM 6.0 - Language > Prefix Header
Add here: $(SRCROOT)/PrefixHeader.pch
If $(SRCROOT) not working for you, set the value of 'Prefix Header' to your PCH file name, with the project name - i.e. for project named 'Test-Project' and PCH file named 'Test-Project-Prefix.pch' and add the complete string 'Test-Project/Test-Project-Prefix.pch'