Bug 1313234

Description of problem:

Compilation of a dictionary fails when sstream is included

Version-Release number of selected component (if applicable):

root-5.34.32-8.fc24.x86_64

How reproducible:

Always

Steps to Reproduce:
1. Create a simple file MyClass.hh containing:
#ifndef __MYCLASS_HH__
#define __MYCLASS_HH__
#include <iostream>
#include <sstream>
class MyClass {
 public:
   MyClass() {
      std::cout << "hello, world!" << std::endl;
   };
};
#endif

2.Create a LinkDef.h containing:
#ifdef __CINT__
#pragma link off all classes;
#endif

3.rootcint -f MyClass.Dict.cc -c MyClass.hh

4. g++  -g -Wall -fPIC -I. -pthread -m64 -I/usr/include/root   -c -o MyClass.Dict.o MyClass.Dict.cc

Actual results:

In file included from MyClass.hh:5:0,
                 from MyClass.Dict.h:34,
                 from MyClass.Dict.cc:17:
/usr/include/c++/6.0.0/sstream:300:7: error: ‘struct std::__cxx11::basic_stringbuf<_CharT, _Traits, _Alloc>::__xfer_bufptrs’ redeclared with different access
       struct __xfer_bufptrs
       ^~~~~~
<builtin>: recipe for target 'MyClass.Dict.o' failed
make: *** [MyClass.Dict.o] Error 1

Expected results:

Should create a .o file that can be made into a library using:

g++ -shared -Wl,-soname,libMyClass.so -o libMyClass.so MyClass.Dict.o

and then loaded into root with

.L libMyClass.so

Additional info:

Adding -DR__ACCESS_IN_SYMBOL to the compile works around the problem, since rootcint generates code containing:

#if !defined(R__ACCESS_IN_SYMBOL)
//Break the privacy of classes -- Disabled for the moment
#define private public
#define protected public
#endif

It is the #define private public which causes the problems.This interacts badly with sstream, which is where struct __xfer_bufptrs is declared (from libstdc++-devel-6.0.0-0.13.fc24.x86_64).

If the #include <sstream> is removed, it compiles in this case, but obviously not in realistic cases, where sstream is really needed.