On 2016.03.24 at 06:50 -0400, Jeffrey Walton wrote: > We caught a report due to _GLIBCXX_USE_CXX11_ABI and abi:cxx11. We are > upstream, and it appears Debian built the library using GCC and > _GLIBCXX_USE_CXX11_ABI was in effect. A user then came along with > Clanf and compiled the userland program. The link failed. This is > expected given our understanding of the landscape. > > We found "GCC5 and the C++11 ABI", > https://developerblog.redhat.com/2015/02/05/gcc5-and-the-c11-abi/. The > pages says: > > Providers of such libraries or interfaces need to consider > whether they want to provide ABI coexistence, like libstdc++ > does, or require their users to rebuild. > > I read the Red Hat blog post, but its not clear to me how to > accomplish the coexistence. That is, I want to ensure the library that > Debian builds has a symbol in both namespace so linking can occur with > either GCC or Clang and "things just work" for the user. > > How is libstdc++ providing symbols in both namespaces? How do I ensure > the symbol is present in both namesspaces so "things just work" for a > user? It will not work until this clang bug gets fixed: https://llvm.org/bugs/show_bug.cgi?id=23529 -- Markus
