clang++ cannot compile even a hello world program in Fedora 17!!!

你们都说clang好，于是我就十分想试一试。我手上的机器只有fedora 17、CentOS 4/5/6。CentOS的repositories里面没有clang。但是fedora 17里面有，于是我就兴致勃勃的装了一个。结果发现，连最简单的Hello World都编译不过去。
 
[changming@test 1]$ clang++ hello.cpp 
In file included from hello.cpp:1: 
In file included from /usr/bin/../lib/gcc/x86_64-redhat-linux/4.7.2/../../../../include/c++/4.7.2/iostream:39: 
In file included from /usr/bin/../lib/gcc/x86_64-redhat-linux/4.7.2/../../../../include/c++/4.7.2/ostream:39: 
In file included from /usr/bin/../lib/gcc/x86_64-redhat-linux/4.7.2/../../../../include/c++/4.7.2/ios:42: 
In file included from /usr/bin/../lib/gcc/x86_64-redhat-linux/4.7.2/../../../../include/c++/4.7.2/bits/ios_base.h:40: 
/usr/bin/../lib/gcc/x86_64-redhat-linux/4.7.2/../../../../include/c++/4.7.2/ext/atomicity.h:48:45: error: use of undeclared 
      identifier ‘__ATOMIC_ACQ_REL’ 
  { return __atomic_fetch_add(__mem, __val, __ATOMIC_ACQ_REL); } 
                                            ^ 
/usr/bin/../lib/gcc/x86_64-redhat-linux/4.7.2/../../../../include/c++/4.7.2/ext/atomicity.h:52:38: error: use of undeclared 
      identifier ‘__ATOMIC_ACQ_REL’ 
  { __atomic_fetch_add(__mem, __val, __ATOMIC_ACQ_REL); } 
                                     ^ 
2 errors generated. 
[changming@test14 1]$ clang hello.cpp 
In file included from hello.cpp:1: 
In file included from /usr/bin/../lib/gcc/x86_64-redhat-linux/4.7.2/../../../../include/c++/4.7.2/iostream:39: 
In file included from /usr/bin/../lib/gcc/x86_64-redhat-linux/4.7.2/../../../../include/c++/4.7.2/ostream:39: 
In file included from /usr/bin/../lib/gcc/x86_64-redhat-linux/4.7.2/../../../../include/c++/4.7.2/ios:42: 
In file included from /usr/bin/../lib/gcc/x86_64-redhat-linux/4.7.2/../../../../include/c++/4.7.2/bits/ios_base.h:40: 
/usr/bin/../lib/gcc/x86_64-redhat-linux/4.7.2/../../../../include/c++/4.7.2/ext/atomicity.h:48:45: error: use of undeclared 
      identifier ‘__ATOMIC_ACQ_REL’ 
  { return __atomic_fetch_add(__mem, __val, __ATOMIC_ACQ_REL); } 
                                            ^ 
/usr/bin/../lib/gcc/x86_64-redhat-linux/4.7.2/../../../../include/c++/4.7.2/ext/atomicity.h:52:38: error: use of undeclared 
      identifier ‘__ATOMIC_ACQ_REL’ 
  { __atomic_fetch_add(__mem, __val, __ATOMIC_ACQ_REL); }

补充：软件开发 , C++ ,