Upgrading from gcc-4.x to gcc-5.x

Critical News
The following (GLEP 42) message has been sent to inform users about the important changes.

Title: GCC 5 Defaults to the New C++11 ABI Author: Mike Frysinger  Content-Type: text/plain Posted: 2015-10-22 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 that include lines similar to: ...: 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 (from gentoolkit) like so: . 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/
 * 1) revdep-rebuild --library 'libstdc\+\+\.so\.6' -- --exclude gcc

Open Bugzilla entries about gcc-5.3
https://bugs.gentoo.org/buglist.cgi?quicksearch=gcc-5.3&list_id=3005290