This repository contains no compiler or library code itself; it uses git submodules to pull in the upstream Clang and LLVM tree, as well as the wasi-libc tree.
The libc portion of this SDK is the wasi-libc.
Upstream Clang and LLVM 8.0 can compile for WASI out of the box, and WebAssembly support is included in them by default. So, all that's done here is to provide builds configured to set the default target and sysroot for convenience.
One could also use a standard Clang 8.0, build a sysroot from the sources mentioned above, and compile with "--target=wasm32-wasi --sysroot=/path/to/sysroot".
Upstream autoconf now recognizes WASI.
For convenience when building packages that aren't yet updated, updated config.sub and config.guess files are installed at share/misc/config.* in the install directory.