Linking error duplicate symbol _kCHPointerSize with CHDataStructure static lib

Question

I am trying to use the CHDataStructures static library for iPhone in my Xcode project. I included it with # import "CHDataStructures.h" in my class header. However, when I compile my project I get the error:

d: duplicate symbol _kCHPointerSize in /Users/sam/Desktop/Apps/libCHDataStructures.a(Util.o) and /Users/sam/Desktop/Apps/build/Apps.build/Debug-iphonesimulator/Apps.build/Objects-normal/i386/AppsAppDelegate.o collect2: ld returned 1 exit status Command /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/g++-4.2 failed with exit code 1

I am using GCC-4.2 compiler and I have tried LLVM GCC 4.2 as well. I also tried with -ObjC, -all_build, and -force_build flags set in the build setting but it is not compiling. I also tried to clean Target, and also make sure with static lib included with target binary or not. But I couldn't figure out the problem. Can anyone help?

Answer 1

Open Util.h file, replace the line

HIDDEN size_t kCHPointerSize;

with

OBJC_EXPORT size_t kCHPointerSize;

Answer 2

Probably far too late now but I just ran into something similar so if it is still an issue, check your import statements.

It looks like you might be referencing kCHPointerSize in both the AppDelegate and your Util class.

In my case I had imported the same .h file once too often. I removed one of the import statements and the problem was solved.