我已经在Fedora21-aarch64中安装了libstdc ++ - debuginfo包，但是当使用gdb打印stringstream.str（）时，我总是得到这样的信息：
(gdb) ptype sp
type = class std::tr1::shared_ptr<std::basic_stringstream<char, std::char_traits<char>, std::allocator<char> > >
[with _Tp = std::basic_stringstream<char, std::char_traits<char>, std::allocator<char> >]
: public std::tr1::__shared_ptr<std::basic_stringstream<char, std::char_traits<char>, std::allocator<char> >, (__gnu_cxx::_Lock_policy)2> {
public:
shared_ptr(void);
void shared_ptr<std::basic_stringstream<char> >(std::basic_stringstream<char, std::char_traits<char>, std::allocator<char> > *);
}
(gdb) p sp->str()
Couldn't find method std::basic_stringstream<char, std::char_traits<char>, std::allocator<char> >::str
源代码如下：
std::tr1::shared_ptr<stringstream> sp ( new stringstream(ios_base::in | ios_base::out | ios_base::binary));
std::tr1::shared_ptr<ostream> osp = sp;
osp->write("hello",6);
cout<<sp->str()<<endl;
和我安装的debuginfo包如下：
#debuginfo-install libstdc++
Loaded plugins: auto-update-debuginfo, langpacks
Package gcc-debuginfo-4.9.2-1.fc21.aarch64 already installed and latest version
Package glibc-debuginfo-2.20-5.fc21.aarch64 already installed and latest version
Package gcc-debuginfo-4.9.2-1.fc21.aarch64 already installed and latest version
No debuginfo packages available to install