Linker command failed?

I got the linker warning. How can i fix this?
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator8.0.sdk/usr/lib/system/libsystem_network.dylib. Link against the umbrella framework ‘System.framework’ instead

This is most likely the UNIX linker error caused by some broken libraries that has become apparent in Xcode 6 for iOS. This will be fixed for 0.9 with updated libraries.

However you can temporaility use this fix.
Add this to your main.mm or main.cpp before your main function itself.

extern "C"{
    size_t fwrite$UNIX2003( const void *a, size_t b, size_t c, FILE *d )
    {
        return fwrite(a, b, c, d);
     }
    char* strerror$UNIX2003( int errnum )
    {
        return strerror(errnum);
    }
    time_t mktime$UNIX2003(struct tm * a)
    {
        return mktime(a);
    }
    double strtod$UNIX2003(const char * a, char ** b) {
        return strtod(a, b);
    }
}

I resolved the issue based on the few steps.
I updated the all third party frameworks which support for the Xcode6. After that i can compile the project in Xcode6.