[WIP] Tls support

Author: bjorn3

Cargo.lock

@@ -30,12 +30,12 @@ default-features = false
 features = ["write"] # We don't need read support
 
 # Uncomment to use local checkout of cranelift
-#[patch."https://github.com/bytecodealliance/cranelift/"]
-#cranelift-codegen = { path = "../cranelift/cranelift-codegen" }
-#cranelift-frontend = { path = "../cranelift/cranelift-frontend" }
-#cranelift-module = { path = "../cranelift/cranelift-module" }
-#cranelift-simplejit = { path = "../cranelift/cranelift-simplejit" }
-#cranelift-object = { path = "../cranelift/cranelift-object" }
+[patch."https://github.com/bytecodealliance/cranelift/"]
+cranelift-codegen = { path = "../cranelift/cranelift-codegen", default-features = false, features = ["std"] }
+cranelift-frontend = { path = "../cranelift/cranelift-frontend", default-features = false, features = ["std"] }
+cranelift-module = { path = "../cranelift/cranelift-module" }
+cranelift-simplejit = { path = "../cranelift/cranelift-simplejit" }
+cranelift-object = { path = "../cranelift/cranelift-object" }
 
 #[patch.crates-io]
 #gimli = { path = "../" }

Cargo.toml

@@ -1,6 +1,7 @@
 #![feature(
     no_core, lang_items, intrinsics, unboxed_closures, type_ascription, extern_types,
-    untagged_unions, decl_macro, rustc_attrs, transparent_unions, optin_builtin_traits
+    untagged_unions, decl_macro, rustc_attrs, transparent_unions, optin_builtin_traits,
+    thread_local,
 )]
 #![no_core]
 #![allow(dead_code)]
@@ -551,3 +552,11 @@ struct PanicLocation {
     line: u32,
     column: u32,
 }
+
+#[no_mangle]
+pub fn get_tls() -> u8 {
+    #[thread_local]
+    static A: u8 = 42;
+
+    A
+}