message: Give an error when attempting to build for MSVC
diff: @@ -127,6 +127,14 @@ fn main() {
  host_triple.clone()
  };
  + if target_triple.ends_with("-msvc") {
  + eprintln!("The MSVC toolchain is not yet supported by rustc_codegen_cranelift.");
  + eprintln!("Switch to the MinGW toolchain for Windows support.");
  + eprintln!("Hint: You can use `rustup set default-host x86_64-pc-windows-gnu` to");
  + eprintln!("set the global default target to MinGW");
  + process::exit(1);
  + }
  +
  let cg_clif_dylib = build_backend::build_backend(channel);
  build_sysroot::build_sysroot(
  channel,
  