Problem compiling ycm_core

[linhmtran168]

I'm using Mac OSX 10.8.2.
Here is the problem:

[ 91%] Built target BoostParts
[ 92%] Building CXX object ycm/CMakeFiles/ycm_core.dir/LetterNode.cpp.o
In file included from /Users/mb985/.vim/bundle/YouCompleteMe/cpp/ycm/LetterNode.cpp:18:
/Users/mb985/.vim/bundle/YouCompleteMe/cpp/ycm/LetterNode.h:63:8: error: private field
      'is_root_node_' is not used [-Werror,-Wunused-private-field]
  bool is_root_node_;
       ^
1 error generated.
make[3]: *** [ycm/CMakeFiles/ycm_core.dir/LetterNode.cpp.o] Error 1
make[2]: *** [ycm/CMakeFiles/ycm_core.dir/all] Error 2
make[1]: *** [ycm/CMakeFiles/ycm_core.dir/rule] Error 2
make: *** [ycm_core] Error 2

This is the output of cmake command:

$ cmake -G "Unix Makefiles" . ~/.vim/bundle/YouCompleteMe/cpp                         
-- The C compiler identification is Clang 4.2.0
-- The CXX compiler identification is Clang 4.2.0
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
Your C++ compiler supports C++11, compiling in that mode.
-- Found PythonLibs: /usr/lib/libpython2.7.dylib (found suitable version "2.7.2", minimum required is "2") 
NOT using libclang, no semantic completion for C/C++/ObjC will be available
-- Found PythonInterp: /usr/bin/python (found version "2.7.2") 
-- Looking for include file pthread.h
-- Looking for include file pthread.h - found
-- Looking for pthread_create
-- Looking for pthread_create - found
-- Found Threads: TRUE  
-- Configuring done
-- Generating done
-- Build files have been written to: /Users/mb985/ycm_build

[Valloric]

Yeah, just updated to Xcode 4.6 and got the same error. Good to know that Clang warnings are improving, that was a good catch.