To do this, you will need to change the project template in the developer directory.
Go to where your templates are located (maybe something like: /Developer/Platforms/iPhoneOS.platform/Developer/Library/Xcode/Project Templates/
, , , .xcodeproj. " ", - project.pbxproj. , .
, (Debug, Release ..), /* Begin XCBuildConfiguration section */.
GCC_VERSION com.apple.compilers.llvm.clang.1_0 (1_0 - LLVM 1.6 Xcode. , GCC_VERSION GCC , , COMPILER_VERSION - ).
(, Xcode, ). LLVM.
, LLVM - 100% .