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From: Mike Gilbert <floppym@gentoo.org>
Date: Sun, 20 Dec 2015 16:31:50 -0500
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Subject: Re: [gentoo-dev] gcc-5 news item wrt C++ ABI
To: Gentoo Dev <gentoo-dev@lists.gentoo.org>
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On Fri, Oct 2, 2015 at 10:13 PM, Mike Frysinger <vapier@gentoo.org> wrote:
> Title: GCC 5 Defaults to the New C++11 ABI
> Author: Mike Frysinger <vapier@gentoo.org>
> Content-Type: text/plain
> Posted: 2015-10-02
> Revision: 1
> News-Item-Format: 1.0
> Display-If-Installed: >=sys-devel/gcc-5
>
> GCC 5 uses the new C++ ABI by default.  When building new code, you might run
> into link time errors like:
> ...: undefined reference to '_ZNSt6chrono12steady_clock3nowEv@GLIBCXX_3.4.17'
> Or you might see linkage failures with "std::__cxx11::string" in the output.
>
> These are signs that you need to rebuild packages using the new C++ ABI.
> You can quickly do so by using revdep-rebuild like so:
> # revdep-rebuild --library 'libstdc\+\+\.so\.6'
>
> For more details, feel free to peruse:
> https://developerblog.redhat.com/2015/02/05/gcc5-and-the-c11-abi/
> https://blogs.gentoo.org/blueness/2015/03/10/the-c11-abi-incompatibility-problem-in-gentoo/

Just a heads-up: the python-based revdep-rebuild which is included
with gentoolkit-0.3.1 requires slightly different syntax:

# revdep-rebuild --library 'libstdc++.so.6'

I pushed a revision to the news item with updated instructions.