The advent of IOS (linker command failed with exit code 1) Error Summary

This article originates from: http://blog.csdn.NET/hengshujiyi/article/details/21182813

Add: I appear this error is a project has two of the same name of the file, as long as the deletion of one is good, may be from the folder is inverted file is a duplicate import error.

This problem usually occurs when you add a third-party library file or when you develop multiple people.

This problem is usually a link error that is caused by a file not being found. We can proceed from the following aspects of the investigation.

1. Take the following error as an example, if you are a multi-person developer, you will find the following error when you complete the synchronization.

1. Undefined Symbols for Architecture armv7:
2. "_objc_class_$_mypagelogviewcontroller", referenced from:
3. Objc-class-ref in BAIDUMOBSTATAPPDELEGATE.O
4. Ld:symbol (s) not found for architecture armv7
5. Clang:error:linker command failed with exit code 1 (use-v to see invocation)

The "Mypagelogviewcontroller" class appears in the error, and you can find the. m file for this class and see his target membeship, as

If it is not checked, click on the check box. And then compile the view.

2. If it is a newly added third-party library and is not a static library

Repeat the first step and then find the Build settings->linking->other Linker Flags

Modify this property to-all_load or-OBJC, depending on the situation. In short, you can try more than a few times.

3. If you are adding a third-party static library (. a file)

1. Undefined Symbols for Architecture armv7:
2. "_objc_class_$_baidumobstat", referenced from:
3. Objc-class-ref in BAIDUMOBSTATAPPDELEGATE.O
4. Objc-class-ref in MYPAGELOGVIEWCONTROLLER.O
5. (Maybe you meant: _objc_class_$_baidumobstatappdelegate)
6. Ld:symbol (s) not found for architecture armv7
7. Clang:error:linker command failed with exit code 1 (use-v to see invocation)

Errors have occurred in all files used in this library, such as the Baidumobstatappdelegate class and the Mypagelogviewcontroller class

This could be a link error caused by this static library path confusion.

Workaround: Build settings->search path->library Search Paths Add the appropriate path to the static library. Such as

If none of the above methods works. You can try a few more ways:

1 to see if there is a newly added file with the same name as the previous file

2, the error message appears in the name of a class, go to the original file to see what the third-party library, the library #import, find out the wrong library, and then follow the official steps to re-add again.

The advent of IOS (linker command failed with exit code 1) Error Summary