Hi, it's time to prepare for GCC 5 as the default compiler in unstable. Compared to earlier version bumps, the switch to GCC 5 is a bit more complicated because libstdc++6 sees a few ABI incompatibilities, partially depending on the C++ standard version used for the builds. libstdc++6 will support two ABI's, the classic cxx98 ABI (currently in testing/unstable) and the new cxx11 ABI (currently enabled in experimental as the default ABI).
- the majority of packages using c++98 or earlier c++ standards should just continue to work. - In GCC 4.9 and earlier versions the libstdc++6 C++11 support was still marked as experimental, and upstream doesn't (and didn't in the past) guarantee c++11 ABI compatibility across major GCC versions. It worked somehow ok in the past, however it won't this time. - some c++98 code won't work when parts are built using GCC 4.9, and some parts with GCC 5 (see PR66145 upstream). Unfortunately due to PR66145 we already have an incompatible libstdc++6 (at least for some packages) in testing/unstable, which was only seen after the first packages were rebuilt and issues like #784655 were reported. My goal is to make the GCC version bump in early July, and use the time until then to prepare libstdc++6 depending packages to get ready for GCC 5, and avoiding version bumps for C++ libraries until this time. Details for the whole transition are outlined in https://wiki.debian.org/GCC5 I'd appreciate feedback for this plan, clarify the wiki page, and would like to post a finalized plan next week to d-d-a, and file appropriate transition bugs next week. Thanks, Matthias -- To UNSUBSCRIBE, email to debian-release-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: https://lists.debian.org/55809725.8040...@debian.org
