I cannot compile my project for the device or simulator anymore. I get 13 Apple Mach-O-Linker errors. It all started after I failed attempt to use sharekit. Here is the log from the error:
ld: warning: directory not found for option '-F/Users/bbrandy95/Documents/Broken Brandsonic Web Projects/Brandsonic Web mobile/../../Downloads/0.2.1gm1/iphoneos4.0/System/Library/Frameworks'
Undefined symbols for architecture armv7:
"_OBJC_CLASS_$_NSURLRequest", referenced from:
objc-class-ref in Brandsonic_Web_mobileAppDelegate.o
objc-class-ref in Brandsonic_Web_mobileViewController.o
"_OBJC_CLASS_$_NSAutoreleasePool", referenced from:
objc-class-ref in main.o
"_objc_msgSendSuper2", referenced from:
-[Brandsonic_Web_mobileAppDelegate dealloc] in Brandsonic_Web_mobileAppDelegate.o
-[Brandsonic_Web_mobileViewController didReceiveMemoryWarning] in Brandsonic_Web_mobileViewController.o
-[Brandsonic_Web_mobileViewController dealloc] in Brandsonic_Web_mobileViewController.o
"_objc_setProperty", referenced from:
-[Brandsonic_Web_mobileAppDelegate setWindow:] in Brandsonic_Web_mobileAppDelegate.o
-[Brandsonic_Web_mobileAppDelegate setViewController:] in Brandsonic_Web_mobileAppDelegate.o
"__objc_empty_vtable", referenced from:
_OBJC_CLASS_$_Brandsonic_Web_mobileAppDelegate in Brandsonic_Web_mobileAppDelegate.o
_OBJC_METACLASS_$_Brandsonic_Web_mobileAppDelegate in Brandsonic_Web_mobileAppDelegate.o
_OBJC_CLASS_$_Brandsonic_Web_mobileViewController in Brandsonic_Web_mobileViewController.o
_OBJC_METACLASS_$_Brandsonic_Web_mobileViewController in Brandsonic_Web_mobileViewController.o
_OBJC_METACLASS_$_SecondView in SecondView.o
_OBJC_CLASS_$_SecondView in SecondView.o
"_objc_msgSend", referenced from:
_main in main.o
-[Brandsonic_Web_mobileAppDelegate application:didFinishLaunchingWithOptions:] in Brandsonic_Web_mobileAppDelegate.o
-[Brandsonic_Web_mobileAppDelegate dealloc] in Brandsonic_Web_mobileAppDelegate.o
-[Brandsonic_Web_mobileAppDelegate GOOGLE] in Brandsonic_Web_mobileAppDelegate.o
-[Brandsonic_Web_mobileAppDelegate YOUTUBE] in Brandsonic_Web_mobileAppDelegate.o
-[Brandsonic_Web_mobileAppDelegate WIKI] in Brandsonic_Web_mobileAppDelegate.o
-[Brandsonic_Web_mobileViewController webView:shouldStartLoadWithRequest:navigationType:] in Brandsonic_Web_mobileViewController.o
...
"__objc_empty_cache", referenced from:
_OBJC_CLASS_$_Brandsonic_Web_mobileAppDelegate in Brandsonic_Web_mobileAppDelegate.o
_OBJC_METACLASS_$_Brandsonic_Web_mobileAppDelegate in Brandsonic_Web_mobileAppDelegate.o
_OBJC_CLASS_$_Brandsonic_Web_mobileViewController in Brandsonic_Web_mobileViewController.o
_OBJC_METACLASS_$_Brandsonic_Web_mobileViewController in Brandsonic_Web_mobileViewController.o
_OBJC_METACLASS_$_SecondView in SecondView.o
_OBJC_CLASS_$_SecondView in SecondView.o
"_OBJC_CLASS_$_NSObject", referenced from:
_OBJC_CLASS_$_Brandsonic_Web_mobileAppDelegate in Brandsonic_Web_mobileAppDelegate.o
"___CFConstantStringClassReference", referenced from:
CFString in Brandsonic_Web_mobileAppDelegate.o
CFString in Brandsonic_Web_mobileAppDelegate.o
CFString in Brandsonic_Web_mobileAppDelegate.o
CFString in Brandsonic_Web_mobileViewController.o
CFString in Brandsonic_Web_mobileViewController.o
CFString in Brandsonic_Web_mobileViewController.o
CFString in Brandsonic_Web_mobileViewController.o
...
"_OBJC_CLASS_$_NSKeyedUnarchiver", referenced from:
objc-class-ref in Brandsonic_Web_mobileViewController.o
"_OBJC_CLASS_$_NSUserDefaults", referenced from:
objc-class-ref in Brandsonic_Web_mobileViewController.o
"_OBJC_CLASS_$_NSURL", referenced from:
objc-class-ref in Brandsonic_Web_mobileAppDelegate.o
objc-class-ref in Brandsonic_Web_mobileViewController.o
"_OBJC_METACLASS_$_NSObject", referenced from:
_OBJC_METACLASS_$_Brandsonic_Web_mobileAppDelegate in Brandsonic_Web_mobileAppDelegate.o
_OBJC_METACLASS_$_Brandsonic_Web_mobileViewController in Brandsonic_Web_mobileViewController.o
_OBJC_METACLASS_$_SecondView in SecondView.o
ld: symbol(s) not found for architecture armv7
clang: error: linker command failed with exit code 1 (use -v to see invocation)
'
How do I fix this? Please help.
For every one with an similar error. If that happens you normally can remove the "Path" under Point
target->Build Settings->Library Search Paths
This error can occur when a framework is added to a project more than once.
- You can fix this by removing the duplicate. To find it, select the framework in the Xcode project navigator and choose Show in Finder. Then clean and build your project.
This can also be caused if you're missing framework header files or a reference to them.
- In that case, you should trying removing the SDK or framework and adding it again.
Good luck.
If you installed dependencies using CocoaPods, make sure you open your XCode project by clicking on your .xcworkspace file, and not the .xcodeproj file.
It seems like the project file may have been corrupted somehow.
The most sure way to fix this is to create a new project, and move your files and old info.plist over on top of it.
The next most likely way to fix this is to create a new target in your current project, and see if that will compile (if you have any special flags from the old target you'll want to copy them).
Also you could try compiling for Release vs. Build and if one of them works look at all of the compiler options and see what is different.
If you added a header search path for Sharekit, perhaps try clearing out the whole header search path and see if that fixes things. Also make sure your project is still including frameworks that a brand new project includes (UIKit and NSFoundation, possibly others).
Add the .m file to compile source page.
steps:-
- clicking on he project in the navigation menu
- select the target
- select build phases
- Select the + button and add the file in compile sources.
Hope that helps anyone with this problem
The problems are the spaces in your path:
xcode uses the following switch for the linker:
-F/Users/bbrandy95/Documents/Broken Brandsonic Web Projects/Brandsonic Web mobile/../../Downloads/0.2.1gm1/iphoneos4.0/System/Library/Frameworks
and since it is not quoted it won't work. ( It is looking for the folder "/Users/bbrandy95/Documents/Broken"
You should rename the directories, or look through the project settings and add quotes to the directories. (But this might be tricky to find)
I too had the same problem with 45 same kind errors, when I add the libxml2.dylib into my project the errors disappeared.
In some cases your library Search Path is empty.Because there are many Apple-mac-o linker errors.
See my answer also at.
I had this issue, now for my circumstances selecting a more recent iOS version as the deployment target rectified this for me. My project was set to deploy to iOS 5 by default and changing this to 7 (the most recent) did the trick.
For anyone new to iOS development this can be done by clicking on your XCode project file in the navigator > deployment info > deployment target and selecting the appropriate version from the drop down menu.
I'm sceptical that this will solve some of the issues that others are having but there may be a few people out there in the same boat as me.
It's because the project inserted the core data's xcdatamodeld file in compile sources. Select your project -> Build Phases -> Compile Sources and delete projectName.xcdatamodeld file.
And also check if you have imported .m file instead of .h file, it also gives the same linker error. Check all the #import codes.
And check if you have added core data frame work in library and imported core data .h file. Check for creation of NSManagedObject and import it's file.
Just try it and reply me if still any error.
I had the same problem,
I just simply set the Build Option -> Enable Bitcode to NO
I faced this problem with my self developed cocoapod.
Error was: Apple Mach-O Linker errror
It turned out, that I had defined a protocol and implemented a protocol extension. One method of the protocol extension was public, but the protocol itself was not. And this caused the Apple Mach-O Linker error.
Example:
protocol MyProtocol { var field: String { get} }
extension MyProtocol { public func giveMeSomething() -> String }
public class MyClass: MyProtocol {}
In the description the error mentioned MyClass referenced from MyProtocol -> MyProtocol referenced from giveMeSomething()...
So, the solution was to make Myprotocol also public
Hope that helps someone.
来源：https://stackoverflow.com/questions/8706348/apple-mach-o-linker-errors-and-i-dont-know-what-to-do