[gentoo-commits] data/gentoo-news:master commit in: 2015-10-22-gcc-5-new-c++11-abi/

["Mike Frysinger" <vapier@gentoo.org>]

commit:     9e7f85087d04f931cba57ba019a8842a8af9470b
Author:     Mike Frysinger <vapier <AT> gentoo <DOT> org>
AuthorDate: Thu Oct 22 13:56:54 2015 +0000
Commit:     Mike Frysinger <vapier <AT> gentoo <DOT> org>
CommitDate: Thu Oct 22 16:04:55 2015 +0000
URL:        https://gitweb.gentoo.org/data/gentoo-news.git/commit/?id=9e7f8508

gcc-5: news item about C++ ABI breakage

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+Title: GCC 5 Defaults to the New C++11 ABI
+Author: Mike Frysinger <vapier@gentoo.org>
+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:
+# revdep-rebuild --library 'libstdc\+\+\.so\.6' -- --exclude gcc
+
+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/