Thanks a lot, Ken. Yes, I understand that, but I believe there was some ABI incompatibility introduced with GCC 5, wasn't it? If I recall correctly, it wasn't just a matter of what C++ standard library you choose, but that even if you chose the same, GCC 5 still broke the ABI compatibility. At the time the rumors said that the reason was an attempt to break compatibility with LLVM because GCC saw it like a competitor, but that was just a rumor.
Kind regards and thanks a lot, César On Tue, May 19, 2020 at 5:08 PM Kenneth F. Cunningham < ken.cunningham.web...@gmail.com> wrote: > > Hi! > > > > I remember a few years ago when a change in GCC 5 caused ABI > > incompatibility with clang. I'm searching for updates on this, and it > seems > > like clang applied the same change eventually, but can they considered > > binary compatible at this moment? Is it now safe to link object code > coming > > from GCC and from clang? > > > > Thanks! > > > > César > > The issue is not so much with the compiler as with the c++ standard > library. > > Any compiler can use any c++ standard library. > > But *by default* (1) clang will use libc++ and gcc will use libstdc++, and > these are not compatible with each other. > > So if you are going to mix objects (and libraries) coming out of clang and > gcc, you have to be sure that they all use the same c++ standard library. > > With c++ code, that is quite tricky to do properly. > > If you use gcc just to build "c" code, or fortran code, there is no > problem mixing those libraries or objects with clang c++ code. > > Ken > > > > > 1. By default, on current MacOS and on all MacOS on MacPorts. Further > needless and sometimes confusing detail omitted for clarity of focus, ask > if truly curious. -K