Bug#791110: libcoverart: library transition may be needed when GCC 5 is the default

Sebastian Ramacher sramacher at debian.org
Wed Jul 8 18:09:26 UTC 2015

Control: tags -1 + pending

On 2015-07-03 13:11:12, Matthias Klose wrote:
> Package: src:libcoverart
> Version: 1.0.0+git20140109-2
> Severity: important
> Tags: sid stretch
> User: debian-gcc at lists.debian.org
> Usertags: libstdc++-cxx11
> Background [1]: libstdc++6 introduces a new ABI to conform to the
> C++11 standard, but keeps the old ABI to not break existing binaries.
> Packages which are built with g++-5 from experimental (not the one
> from testing/unstable) are using the new ABI.  Libraries built from
> this source package export some of the new __cxx11 or B5cxx11 symbols,
> and dropping other symbols.  If these symbols are part of the API of
> the library, then this rebuild with g++-5 will trigger a transition
> for the library.
> What is needed:
>  - Rebuild the library using g++/g++-5 from experimental. Note that
>    most likely all C++ libraries within the build dependencies need
>    a rebuild too. You can find the log for a rebuild in
>      https://people.debian.org/~doko/logs/gcc5-20150701/
>    Search for "BEGIN GCC CXX11" in the log.
>  - Decide if the symbols matching __cxx11 or B5cxx11 are part of the
>    library API, and are used by the reverse dependencies of the
>    library.
>  - If there are no symbols matching __cxx11 or B5cxx11 in the symbols
>    forming the library API, you should close this issue with a short
>    explanation.

The public API contains symbols matching __cxx11. But ...

>  - If there are no reverse dependencies, it should be the package
>    maintainers decision if a transition is needed.  However this might
>    break software which is not in the Debian archive, and built
>    against these packages.

... the only reverse dependency of libcoverartcc1 is libcoverart1 from the same
source package.

I've uploaded a package changing libcovertartcc1 to libcoverartcc1v5 to
experimental. Once g++ 5 is default in unstable, uploading this change to
unstable is enough.

Sebastian Ramacher
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