tree cc53b70a29f2426693c9299f163af676eda5497c
parent de8831934a1e837f1ec22806e931991914b99389
author Louis Dionne <ldionne@apple.com> 1585843690 -0400
committer Louis Dionne <ldionne@apple.com> 1585844053 -0400

[libc++] Attempt to fix the 'runtimes' build

The 'runtimes' build started failing because libc++ stopped using the
in-tree libc++abi when HAVE_CXXABI is set after 61e89737c. This commit
tries to bring back the old behavior when HAVE_CXXABI is set in order
to fix CIs.

However, we really need to sit down and discuss what ways of building
libc++ are supported and formalize them, because having the libc++ build
system branch on basically random variables in some CMake cache somewhere
is not a viable path forward.