Previously i worked on one project that is executing fine in Xcode 5.1.1 version. When i run the same code in Xcode 6 with iPhone5(8.0) simulator it is showing clang error. Here i am adding that error. please help me out.
Ld /Users/Anji/Library/Developer/Xcode/DerivedData/EuroTrips-cqammgactoqvmbdefwhycdhgrfkc/Build/Products/Debug-iphonesimulator/EuroTrips.app/EuroTrips normal i386
cd /Users/Anji/ios-trip-europe
export IPHONEOS_DEPLOYMENT_TARGET=4.0
export PATH="/Applications/Xcode 2.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Applications/Xcode 2.app/Contents/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"
/Applications/Xcode\ 2.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -arch i386 -isysroot /Applications/Xcode\ 2.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator8.0.sdk -L/Users/Anji/Library/Developer/Xcode/DerivedData/EuroTrips-cqammgactoqvmbdefwhycdhgrfkc/Build/Products/Debug-iphonesimulator -L/Users/Anji/ios-trip-europe/EuroTrips/Twitter+OAuth/Libraries\ &\ Headers -F/Users/Anji/Library/Developer/Xcode/DerivedData/EuroTrips-cqammgactoqvmbdefwhycdhgrfkc/Build/Products/Debug-iphonesimulator -filelist /Users/Anji/Library/Developer/Xcode/DerivedData/EuroTrips-cqammgactoqvmbdefwhycdhgrfkc/Build/Intermediates/EuroTrips.build/Debug-iphonesimulator/EuroTrips.build/Objects-normal/i386/EuroTrips.LinkFileList -Xlinker -objc_abi_version -Xlinker 2 -fobjc-arc -fobjc-link-runtime -Xlinker -no_implicit_dylibs -mios-simulator-version-min=4.0 -framework Social -weak-lxml2 -weak_framework Accounts -weak_framework Twitter -framework SystemConfiguration -framework MessageUI -lsqlite3.0 -framework CoreLocation -framework MapKit -framework UIKit -framework Foundation -framework CoreGraphics -lOAuth -Xlinker -dependency_info -Xlinker /Users/Anji/Library/Developer/Xcode/DerivedData/EuroTrips-cqammgactoqvmbdefwhycdhgrfkc/Build/Intermediates/EuroTrips.build/Debug-iphonesimulator/EuroTrips.build/Objects-normal/i386/EuroTrips_dependency_info.dat -o /Users/Anji/Library/Developer/Xcode/DerivedData/EuroTrips-cqammgactoqvmbdefwhycdhgrfkc/Build/Products/Debug-iphonesimulator/EuroTrips.app/EuroTrips
ld: -pie can only be used when targeting iOS 4.2 or later
clang: error: linker command failed with exit code 1 (use -v to see invocation)