On 06/15/2012 10:12 PM, James Y Knight wrote:
Whether or not this particular incompatibility was intended or not, the point remains. You cannot say that GCC devs are taking the C++11 binary incompatibility issue seriously while: a) there exist serious ABI incompatibilities between the modes. b) there is essentially no notice to users about the problem (and lots of users already brokenly compiling in C++11 mode!) c) there are no recommendations or plans for how users and distros are expected to deal with the issue.
Trying to understand what the status quo (in GCC 4.7) is exactly: The source of libstdc++ contains code conditional on __GXX_EXPERIMENTAL_CXX0X__ (to differentiate -std=c++11 from -std=c++98 behavior), but such conditional code happens to remain confined to "inline-only" header code for now. Therefore, a single version of libstdc++.so.6 is enough for both -std=c++11 and -std=c++98 applications (without needing to resort to additional tricks in the implementation of libstdc++). Is that right?
Stephan
