Add rustdoc-clif wrapper

Author: bjorn3

build_system/build_sysroot.rs

@@ -35,7 +35,7 @@ pub(crate) fn build_sysroot(
     try_hard_link(cg_clif_dylib_src, &cg_clif_dylib_path);
 
     // Build and copy rustc and cargo wrappers
-    for wrapper in ["rustc-clif", "cargo-clif"] {
+    for wrapper in ["rustc-clif", "rustdoc-clif", "cargo-clif"] {
         let wrapper_name = get_wrapper_file_name(wrapper, "bin");
 
         let mut build_cargo_wrapper_cmd = Command::new("rustc");

scripts/rustdoc-clif.rs

@@ -0,0 +1,36 @@
+use std::env;
+use std::ffi::OsString;
+#[cfg(unix)]
+use std::os::unix::process::CommandExt;
+use std::path::PathBuf;
+use std::process::Command;
+
+fn main() {
+    let sysroot = PathBuf::from(env::current_exe().unwrap().parent().unwrap());
+
+    let cg_clif_dylib_path = sysroot.join(if cfg!(windows) { "bin" } else { "lib" }).join(
+        env::consts::DLL_PREFIX.to_string() + "rustc_codegen_cranelift" + env::consts::DLL_SUFFIX,
+    );
+
+    let mut args = std::env::args_os().skip(1).collect::<Vec<_>>();
+    args.push(OsString::from("-Cpanic=abort"));
+    args.push(OsString::from("-Zpanic-abort-tests"));
+    let mut codegen_backend_arg = OsString::from("-Zcodegen-backend=");
+    codegen_backend_arg.push(cg_clif_dylib_path);
+    args.push(codegen_backend_arg);
+    if !args.contains(&OsString::from("--sysroot")) {
+        args.push(OsString::from("--sysroot"));
+        args.push(OsString::from(sysroot.to_str().unwrap()));
+    }
+
+    // Ensure that the right toolchain is used
+    env::set_var("RUSTUP_TOOLCHAIN", env!("RUSTUP_TOOLCHAIN"));
+
+    #[cfg(unix)]
+    Command::new("rustdoc").args(args).exec();
+
+    #[cfg(not(unix))]
+    std::process::exit(
+        Command::new("rustdoc").args(args).spawn().unwrap().wait().unwrap().code().unwrap_or(1),
+    );
+}