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From: "costamagnagianfranco at yahoo dot it" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/66262] New: [REGRESSION] testsuite failure with libstdc++ (gcc-5) and g++-4.9 together
Date: Sat, 23 May 2015 10:08:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66262

            Bug ID: 66262
           Summary: [REGRESSION] testsuite failure with libstdc++ (gcc-5)
                    and g++-4.9 together
           Product: gcc
           Version: 5.1.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: costamagnagianfranco at yahoo dot it
  Target Milestone: ---

Hi, sorry in advance for the low quality bug report.

I'm reporting this upstream, since I suspect the ABI broke in some bad way
between 4.9 and 5.0.

note: I tried to explain as much as possible on Debian bug [1]

Firstly I wasn't able to make it work with g++-5 and libstdc++ from gcc-5
package

After the Debian Maintainer rebuilt gcc-5 with 

   * Configure with
       --disable-libstdcxx-dual-abi --with-default-libstdcxx-abi=c++98
     While libstdc++ provides a dual ABI to support both the c++98 and c++11
     ABI, there is no committment on compatibility of the old experimental
     c++11 ABI from GCC 4.9 and the stable c++11 ABI in GCC 5.


and now I can build them with both g++-5 and libstdc++ from gcc-5.

the problem actually is that now Debian has libstdc++ from gcc-5, and the
default compiler still set to gcc-4.9.

With that combination (g++-4.9 and libstdc++ from gcc-5) the bug is there and I
can't upload in Debian the new release until I figure this out.

I can try to provide more informations, just feel free to ask me.

[1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=784655