On Nov 2, 2017, at 14:08, Joshua Root wrote: > On 2017-11-3 05:39 , Ryan Schmidt wrote: >> >> On Nov 2, 2017, at 13:00, Joshua Root wrote: >> >>> The reason for the ABI incompatibilities is, AIUI, that before C++11 the >>> C++ standard did not specify an ABI. So theoretically mixing libc++ and >>> libstdc++ works just as well whether you are on Linux or macOS -- that >>> is to say, if everything is a new enough version to be C++11 compliant >>> and you use it in that mode, it should work. >>> >>> If, OTOH, you try any mix involving a pre-C++11 stdlib (like the system >>> libstdc++ on macOS), it won't work. >> >> So what do you think about what the cxx11-1.1 portgroup is doing? > > Which part? If you mean using the old ABI, I guess it makes some sense > to maintain compatibility with the system libstdc++ on those platforms > where it is the default. Not sure how many ports use C++11 but link with > system libs that use C++, or with other ports that use C++ < 11.
The part where it allows a port to be compiled with MacPorts libstdc++. Why is this ok? Didn't we used to have the problem that C++ software compiled with gcc would crash because it used new gcc libstdc++ but a library it used was using OS X's old libstdc++? Why is that no longer a problem with this portgroup?
