Patch some more things away

.gitignore

@@ -63,4 +63,4 @@ version.texi
 /src/target/
 
 no_llvm_build
-
+/error_metadata

README.md

@@ -4,10 +4,15 @@ Attempt to build rustc for wasm.
 $ rustup override set nightly
 $ rustup toolchain add wasm32-unknown-wasi
 $ cd src/rustc
-$ CFG_COMPILER_HOST_TRIPLE="wasm32-unknown-wasi" RUSTC_ERROR_METADATA_DST="./error_metadata" RUSTFLAGS="-Zforce-unstable-if-unmarked" cargo +nightly build --target wasm32-unknown-wasi
-$ wasmtime ../../target/wasm32-unknown-wasi/debug/rustc_binary.wasm
+$ CFG_COMPILER_HOST_TRIPLE="wasm32-unknown-wasi" RUSTC_ERROR_METADATA_DST="./error_metadata" RUSTFLAGS="-Zforce-unstable-if-unmarked" cargo +nightly build --target wasm32-unknown-wasi --release
+
+$ wasmtime ../../target/wasm32-unknown-wasi/release/rustc_binary.wasm
+# or
+$ wasmer run ../../target/wasm32-unknown-wasi/release/rustc_binary.wasm --backend singlepass -- example.rs $(rustc --print sysroot)
 ```
 
+> Compilation in debug mode is currently broken. See https://github.com/rust-lang/rust/issues/60540.
+
 
 # The Rust Programming Language
 

src/librustc/session/filesearch.rs

@@ -129,6 +129,11 @@ pub fn get_or_default_sysroot() -> PathBuf {
         })
     }
 
+    #[cfg(target_os = "wasi")]
+    {
+        panic!("get_or_default_sysroot");
+    }
+
     match env::current_exe() {
         Ok(exe) => {
             match canonicalize(Some(exe)) {

src/librustc/session/mod.rs

@@ -1182,9 +1182,7 @@ fn build_session_(
     let print_fuel = AtomicU64::new(0);
 
     let working_dir = env::current_dir().unwrap_or_else(|e|
-        p_s.span_diagnostic
-            .fatal(&format!("Current directory is invalid: {}", e))
-            .raise()
+        PathBuf::from(".")
     );
     let working_dir = file_path_mapping.map_prefix(working_dir);
 

src/librustc_interface/util.rs

@@ -171,13 +171,13 @@ pub fn spawn_thread_pool<F: FnOnce() -> R + Send, R: Send>(
     stderr: &Option<Arc<Mutex<Vec<u8>>>>,
     f: F,
 ) -> R {
-    let mut cfg = thread::Builder::new().name("rustc".to_string());
+    /*let mut cfg = thread::Builder::new().name("rustc".to_string());
 
     if let Some(size) = get_stack_size() {
         cfg = cfg.stack_size(size);
     }
 
-    scoped_thread(cfg, || {
+    scoped_thread(cfg, || {*/
         syntax::with_globals( || {
             ty::tls::GCX_PTR.set(&Lock::new(0), || {
                 if let Some(stderr) = stderr {
@@ -186,7 +186,7 @@ pub fn spawn_thread_pool<F: FnOnce() -> R + Send, R: Send>(
                 ty::tls::with_thread_locals(|| f())
             })
         })
-    })
+    //})
 }
 
 #[cfg(parallel_compiler)]