WASI support
WASI is the WebAssembly System Interface, a new API for WebAssembly in development here:
https://github.com/WebAssembly/WASI
The WASI target is recognized by LLVM and Clang 8.0, Rust nightly, and autotools, for example.
We'd like to add support to CMake, for example so that we can add OR WASI
to this line in LLVM's libcxx, and similar things in CMakeLists.txt files in other projects. We have workarounds, but it seems to make sense to start the process for eventually obviating them.
I originally submitted this pull request, and the feedback was to file an issue, which is what I'm doing now :-)