Im getting this linker error that won't let me compile. It only happens on the simulator.
KEY POINTS:
- Happens only in simulator
- Similar to THIS question, but found no FRAMEWORK_SEARCH_PATHS in my .pbxproj file
- Though my OS is 10.6.2, I had to build target 1.5 to avoid other linker errors
- libxml2.dylib IS required and is in my Frameworks group
- The other cited libraries I have never heard of.
- Tried bringing in those other Libs under frameworks, didn't solve.
Build SpaceTweet of project SpaceTweet with configuration Debug
Ld build/Debug-iphonesimulator/SpaceTweet.app/SpaceTweet normal i386
cd "/Users/Scott/Desktop/iPhone Dev/SpaceTweet(Experimental)"
setenv MACOSX_DEPLOYMENT_TARGET 10.5
setenv PATH "/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"
/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc-4.2 -arch i386 -isysroot /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.1.3.sdk "-L/Users/Scott/Desktop/iPhone Dev/SpaceTweet(Experimental)/build/Debug-iphonesimulator" -L/Users/Scott/Desktop "-L/Users/Scott/Desktop/iPhone Dev/SpaceTweet(Experimental)/../../libYAJLIPhone-0" -L/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS3.0.sdk/usr/lib -L/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.1.3.sdk/usr/lib -L/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.0.sdk/usr/lib "-F/Users/Scott/Desktop/iPhone Dev/SpaceTweet(Experimental)/build/Debug-iphonesimulator" -filelist "/Users/Scott/Desktop/iPhone Dev/SpaceTweet(Experimental)/build/SpaceTweet.build/Debug-iphonesimulator/SpaceTweet.build/Objects-normal/i386/SpaceTweet.LinkFileList" -mmacosx-version-min=10.5 -framework Foundation -framework UIKit -framework CoreGraphics -framework AVFoundation -framework MessageUI -lYAJLIPhone -lxml2 -o "/Users/Scott/Desktop/iPhone Dev/SpaceTweet(Experimental)/build/Debug-iphonesimulator/SpaceTweet.app/SpaceTweet"
ld: warning: in /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS3.0.sdk/usr/lib/libxml2.dylib, missing required architecture i386 in file
ld: warning: in /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS3.0.sdk/usr/lib/libSystem.dylib, missing required architecture i386 in file
ld: in /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS3.0.sdk/usr/lib/libobjc.A.dylib, missing required architecture i386 in file
collect2: ld returned 1 exit status
Command /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc-4.2 failed with exit code 1
CLUE:
Again, MY question is very similar to THIS SOLVED QUESTION except that in my case I did NOT find a FRAMEWORK_SEARCH_PATHS entry in the .pbxproj file in my project bundle and thus could not solve in the manner in which that question was solved.
The problem is this:
-L/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS3.0.sdk/usr/lib
That's telling your Simulator (i386) build to use files from the Device (arm) /usr/lib.
Find in your target where /usr/lib is (just use the Search bubble in the target's Get Info / Build Settings tab) and delete it. The compiler will use the correct platform's usr/lib if it's not told to use the wrong one first.
I have the same issue. And it turns out to run my release version code on debug environment. Click "Edit schema..." and change Build Configuration to Release solved my problem.
I had the same thing happen to me. I deleted and re added all my frameworks and still had the same issue. To get rid of the error finally I had to delete the path pointing to the offending library from Library Search Paths under build settings.
来源：https://stackoverflow.com/questions/2528114/xcode-linker-error-on-iphone-app-only-on-simulator