The __gnu_cxx::stdio_sync_filebuf<char> constructor are
not listed in gnu.ver, so aren't provided by libstdc++.so.
The following test doesn't link with -O0 or -O1, although
it does with -O2, "-O0 -static" and "-O1 -static".

-------------------------------------------------------------
#include <cstdio>
#include <ext/stdio_sync_filebuf.h>

__gnu_cxx::stdio_sync_filebuf<char> foo (stdin);
int main () {}
-------------------------------------------------------------


-- 
           Summary: __gnu_cxx::stdio_sync_filebuf<char> constructor isn't
                    exported by the DSO
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Keywords: link-failure
          Severity: normal
          Priority: P3
         Component: libstdc++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: rsandifo at gcc dot gnu dot org
 GCC build triplet: x86_64-linux-gnu
  GCC host triplet: x86_64-linux-gnu
GCC target triplet: x86_64-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35209

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