How to troubleshoot duplicate symbols for architecture x86_64 compilation errors

Ld:5 duplicate symbols (the attributes that appear here are the key to the problem) _count for architecture x86_64

Clang:error:linker command failed with exit code 1 (use-v to see invocation)

/users/zxtw/library/developer/xcode/deriveddata/fightlandlord-gfkaxalabyaagtcimlrskdbtudbx/build/intermediates /fightlandlord.build/debug-iphonesimulator/fightlandlord.build/objects-normal/i386/viewcontroller.o

A look at the error message indicates a link error. In translation, you can first know that the error message is an error when linking XXXX.O, (. O is a linked file). And then the bottom ld:5 Duplicate symbols for architecture x86_64 It means that there are 5 repeating symbols in the x86-64 architecture (several of us do not need to), repetition is a keyword, and the following two scenarios can cause this error to occur:One: Some files have been imported repeatedly in the project. This is typically imported in a three-party library. Workaround: Simply find the file in the files directory to duplicate the imported file, delete it, or remove the entire tripartite library, re-import it, or import it with cocopods. Two: Needed in some parts of the project Import "XXXX.h" and #import "XXXX.M". Solution: Carefully check the project, find the wrong correction can be.

Three. The property has a problem with the declaration

For example, if this is the case, the problem may appear on the declaration of the property Count

As for the other reasons are still in silent cognition ...

How to troubleshoot duplicate symbols for architecture x86_64 compilation errors