[cfe-dev] weakref declaration must have internal linkage

[The Dragon Book]

I am building a simple c++ program using clang++ and I am getting errors
like below. I have added the gcc include paths manually as specified in the
clang website. How do I resolve these?

In file included from a2.cpp:1:
In file included from /usr/include/c++/4.1.2/vector:65:
In file included from /usr/include/c++/4.1.2/bits/stl_algobase.h:69:
In file included from /usr/include/c++/4.1.2/iosfwd:45:
In file included from
/usr/include/c++/4.1.2/i386-redhat-linux/bits/c++io.h:38:
In file included from
/usr/include/c++/4.1.2/i386-redhat-linux/bits/gthr.h:132:
/usr/include/c++/4.1.2/i386-redhat-linux/bits/gthr-default.h:100:1: error:
weakref declaration must have internal linkage
__gthrw(pthread_once)
^
/usr/include/c++/4.1.2/i386-redhat-linux/bits/gthr-default.h:81:23: note:
expanded from:
#define __gthrw(name) __gthrw2(__gthrw_ ## name,name,name)
                      ^
/usr/include/c++/4.1.2/i386-redhat-linux/bits/gthr-default.h:72:46: note:
expanded from:
  extern __typeof(type) name __attribute__ ((__weakref__(#name2))); \
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