[Bug c++/26526] New: 4.1.0 regression: std::__copy_streambufs link failure when _GLIBCXX_DEBUG is defined

["ctsa at u dot washington dot edu" <gcc-bugzilla at gcc dot gnu dot org>]

Code calling ostream::operator<<(streambuf*) fails to link with g++ 4.1.0 when
_GLIBCXX_DEBUG is defined; more specifically, when _GLIBCXX_EXTERN_TEMPLATE is
defined to 0. This problem is not observed with 
1) g++ 4.0.1 on the same system or 
2) the same configuration of g++ 4.1.0 for i686-linux

test.cc:
"""
#include <iostream>

main() {
  std::cout << std::cin.rdbuf();
}
"""

[ctsa@genome]$ g++ -D_GLIBCXX_DEBUG test.cc
/tmp/ccyq7RoG.o(.gnu.linkonce.t._ZNSolsEPSt15basic_streambufIcSt11char_traitsIcEE+0x75):
In function `std::basic_ostream<char, std::char_traits<char>
>::operator<<(std::basic_streambuf<char, std::char_traits<char> >*)':
: undefined reference to `long std::__copy_streambufs<char,
std::char_traits<char> >(std::basic_streambuf<char, std::char_traits<char> >*,
std::basic_streambuf<char, std::char_traits<char> >*)'
collect2: ld returned 1 exit status

the same link error occurs using "g++ -D_GLIBCXX_EXTERN_TEMPLATE=0 test.cc"


[ctsa@genome]$ g++ -v
Using built-in specs.
Target: x86_64-unknown-linux-gnu
Configured with: ../gcc-4.1.0/configure -enable-languages=c,c++
--enable-concept-checks --enable-__cxa_atexit --disable-checking
--prefix=/home/ctsa/opt/x86_64-linux/gcc-4.1
Thread model: posix
gcc version 4.1.0


-- 
           Summary: 4.1.0 regression: std::__copy_streambufs link failure
                    when _GLIBCXX_DEBUG is defined
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: ctsa at u dot washington dot edu
 GCC build triplet: x86_64-unknown-linux-gnu
  GCC host triplet: x86_64-unknown-linux-gnu
GCC target triplet: x86_64-unknown-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26526