| 1 |
On Fri, Oct 02, 2015 at 10:13:09PM -0400, Mike Frysinger wrote: |
| 2 |
> Title: GCC 5 Defaults to the New C++11 ABI |
| 3 |
> Author: Mike Frysinger <vapier@g.o> |
| 4 |
> Content-Type: text/plain |
| 5 |
> Posted: 2015-10-02 |
| 6 |
> Revision: 1 |
| 7 |
> News-Item-Format: 1.0 |
| 8 |
> Display-If-Installed: >=sys-devel/gcc-5 |
| 9 |
> |
| 10 |
> GCC 5 uses the new C++ ABI by default. When building new code, you might run |
| 11 |
> into link time errors like: |
| 12 |
> ...: undefined reference to '_ZNSt6chrono12steady_clock3nowEv@GLIBCXX_3.4.17' |
| 13 |
|
| 14 |
Exactly what part of this line is the important part? I take it its the |
| 15 |
@GLIBCXX_3.4.17? or is it the lack of the __cxx11::? I have a feeling |
| 16 |
that posted like this and users will think anytime it says undefined |
| 17 |
reference then its a C++ issue which is likely not the case. |
| 18 |
|
| 19 |
> Or you might see linkage failures with "std::__cxx11::string" in the output. |
| 20 |
> |
| 21 |
> These are signs that you need to rebuild packages using the new C++ ABI. |
| 22 |
> You can quickly do so by using revdep-rebuild like so: |
| 23 |
> # revdep-rebuild --library 'libstdc\+\+\.so\.6' |
| 24 |
> |
| 25 |
> For more details, feel free to peruse: |
| 26 |
> https://developerblog.redhat.com/2015/02/05/gcc5-and-the-c11-abi/ |
| 27 |
> https://blogs.gentoo.org/blueness/2015/03/10/the-c11-abi-incompatibility-problem-in-gentoo/ |
| 28 |
|
| 29 |
|
| 30 |
-- Jason |
Archives