I’ve uploaded an additional Windows tarball with this hash:
C:\src>certutil -hashfile "llvm_package_18.1.0-rc3\clang+llvm-18.1.0-rc3-x86_64-pc-windows-msvc.tar.xz" sha256
SHA256 hash of llvm_package_18.1.0-rc3\clang+llvm-18.1.0-rc3-x86_64-pc-windows-msvc.tar.xz:
47848305a3db757b13d9afb82b763c1cf6e38a52372abbe6dc6c2502752d8aa5
CertUtil: -hashfile command completed successfully.
As opposed to the regular installer, this tarball includes all the non-toolchain bits (opt, llc, …), .lib files, etc. similar to the tarballs for other platforms.
It was built with
llvm-project\llvm\utils\release\build_llvm_release.bat --x64 --version=18.1.0-rc3 using the script at 52ada07.