Jeremie Courreges-Anglas <j...@wxcvbn.org> wrote: > On Tue, Feb 11 2020, George Koehler <kern...@gmail.com> wrote: > > On Tue, 11 Feb 2020 15:20:00 +0100 > > Jeremie Courreges-Anglas <j...@wxcvbn.org> wrote: > > > >> fwiw I'm already ok with the diff George sent for ports/devel/llvm. > >> I'm mostly ok with this one but it would be nice to know whether > >> base-clang can rebuild itself. :) > > > > base-clang can't rebuild itself in the normal way. I have been > > exchanging mails with Todd Mortimer, who has been testing my diff with > > a faster macppc machine. The diff changes the ABI between > > /usr/bin/clang and /usr/lib/libc++.so.3.0, so when we install a new > > libc++ built by clang -msvr4-struct-return, but still have a clang > > built as if by -maix-struct-return, then clang crashes and can't > > rebuild itself! It might be possible to use a static-link clang to > > cross the ABI change. > > > > A backtrace from clang pointed to a function in libc++ that returns a > > std::string::iterator, a small struct where sizeof(iterator) == 4. > > So the steps would be: > - build and install a new clang > - bump the major of libc++, build and install it > - rebuild and reinstall clang > - build new snap > > Assuming those steps are correct, you could ask Theo to handle the ABI > break. A note in current.html could be useful too.
Sure, commit it then I'll follow.
