Linker error when building Cocos2d-X project in XCode

cocos2d-x C++
1

Hi,

I am trying to build my project in XCode (this project is an upgrade from Cocos2d-X 2.2.6 to Cocos2d-X 3.10), but I am getting a linker error:

    /proj.ios_mac/build/IgualOuDiferente_Cocos3x.build/Debug-iphonesimulator/MyGame-mobile.build/Objects-normal/i386/AppDelegate-8B40F64EC413FCA2.o
duplicate symbol _main in:
    /proj.ios_mac/build/MyGame.build/Debug-iphonesimulator/MyGame-mobile.build/Objects-normal/i386/MyGame.o
    /proj.ios_mac/build/MyGame.build/Debug-iphonesimulator/MyGame.build/Objects-normal/i386/main.o
ld: 13 duplicate symbols for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)

I am not sure what can I do to fix this…

Note: I was able to successfully build a new cocos 2d project using cocos new.

2

“You have two modules declaring the same class. Perhaps one is no longer needed?
You are importing any header file in both the files .m and .h :frowning: Remove from one place.)
You are importing any .m file somewhere. :- (Import .h file instead of .m file)
You have defined and declared any const variable in outside(above)
the @interface{} in any of .h file, it might being duplicated. :- (Do it
in the .m file.)”


https://www.google.de/#q=duplicate+symbol+_main+in+xcode

3

Hi,

Actually my whole code is written in C++, so I don’t think that I am importing any .m or .cpp files anywhere.

I’ve done some digging in my code I found out that I had 2 AppDelegate.cpp and AppDelegate.h files on the XCode project. Once I deleted them almost all the errors went away except for this one:

duplicate symbol _main in:
    /Users/felipe/Library/Developer/Xcode/DerivedData/IgualOuDiferente_Cocos3x-avmctbgxqubhqqezeuioqyscamrh/Build/Intermediates/IgualOuDiferente_Cocos3x.build/Debug-iphonesimulator/IgualOuDiferente_Cocos3x-mobile.build/Objects-normal/x86_64/main.o
    /Users/felipe/Library/Developer/Xcode/DerivedData/IgualOuDiferente_Cocos3x-avmctbgxqubhqqezeuioqyscamrh/Build/Intermediates/IgualOuDiferente_Cocos3x.build/Debug-iphonesimulator/IgualOuDiferente_Cocos3x-mobile.build/Objects-normal/x86_64/IgualOuDiferente.o
ld: 1 duplicate symbol for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

I am not sure where is the problem with this one, since I don’t import the main class anywhere in the code except on the stubs that were already created by the cocos new process.

4

perhaps you have an incorrect header guard?

you definitely have something defined twice.

5

Hi,

I search my code and I found out that I had a IgualOuDiferente.cpp file which had a main method inside it. I am not quite sure where it came from, but once I commented out the main method, I was able to build it without any problems.

Thanks for the help! :smile: