CODEWITHSUNDEEP
c++ios5xcode4.2
user968597
user968597

Reputation: 1156

How to remove ld: duplicate symbol _ in xcode 4.2 ( c++ code )

I am trying to compile the c++ code in xcode and I am getting following error:

ld: duplicate symbol _selectedFields in Library/Developer/Xcode/DerivedData/ReadHeaderTBL-arftrodtnbtmucbjkejinzonhulu/Build/Intermediates/ReadHeaderTBL.build/Debug-iphonesimulator/ReadHeaderTBL.build/Objects-normal/i386/readingTBLCPP.o and /Library/Developer/Xcode/DerivedData/ReadHeaderTBL-arftrodtnbtmucbjkejinzonhulu/Build/Intermediates/ReadHeaderTBL.build/Debug-iphonesimulator/ReadHeaderTBL.build/Objects-normal/i386/ReadFile.o for architecture i386

The symbol " selectedFields " is declared in one class and invoked from other.

It is declared as:

       std::string selectedFields;

I am not getting the cause for this error.

Upvotes: 0

Views: 242

Answers (1)

john
john

Reputation: 8027

Usually when we get this problem it's because people have declared the variable in a header file. You should define it in a header file

extern std::string selectedFields; // definition

and declare it in one source file

std::string selectedFields; // declaration

If your problem is something else then post the code. It gets a bit dispiriting to have to guess what everyone's problem is because they don't bother to post code.

Upvotes: 2

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