Source: ismrmrd Version: 1.2.3-2 Severity: important Tags: sid stretch User: debian-...@lists.debian.org Usertags: libstdc++-cxx11
Hi,
your library exposes std::string or std::list in its public API, and
therefore breaks ABI on rebuild with g++ 5. However as the library has
no reverse depends in Debian it's up to you whether to rename the binary
package or not.
Cheers,
Julien
The following is a form letter:
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 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. 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/gcc5-20150813/
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.
- 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.
- If a library transition is needed, please prepare for the change.
Rename the library package, append "v5" to the name of the package
(e.g. libfoo2 -> libfoo2v5). Such a change can be avoided, if you
have a soversion bump and you upload this version instead of the
renamed package. Prepare a patch and attach it to this issue (mark
this issue with patch), so that it is possible to NMU such a
package. We'll probably have more than hundred transitions
triggered.
- If unsure if a transition is needed, please tag the issue with help
to ask for feedback from other Debian developers.
The libstdc++6 transition will be a large one, and it will come with a
lot of pain. Please help it by preparing the follow-up transitions.
[1] https://wiki.debian.org/GCC5#libstdc.2B-.2B-_ABI_transition
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