martinboehme 40104ba8b1 Link against the C++ standard library when C++ interop is enabled (#30914) ...

This doesn't yet allow including C++ headers on platforms where libc++
isn't the default; see comments in UnixToolChains.cpp for details.

However, it does, for example, allow throwing and catching exceptions in C++
code used through interop, unblocking
https://github.com/apple/swift/pull/30674/files.

The flags (-enable-experimental-cxx-interop and -experimental-cxx-stdlib) carry
"experimental" in the name to emphasize that C++ interop is still an
experimental feature.

Co-authored-by: Michael Forster <forster@google.com>

2020-07-09 15:59:26 +02:00

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