cast the #[used] static to *i8

to match the type signature of the llvm.used variable

Author: Jorge Aparicio

src/librustc_trans/base.rs

@@ -1189,8 +1189,6 @@ pub fn trans_crate<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
 
             // Create llvm.used variable
             if !ccx.used_statics().borrow().is_empty() {
-                debug!("llvm.used");
-
                 let name = CString::new("llvm.used").unwrap();
                 let section = CString::new("llvm.metadata").unwrap();
                 let array = C_array(Type::i8(&ccx).ptr_to(), &*ccx.used_statics().borrow());

src/librustc_trans/consts.rs

@@ -277,7 +277,8 @@ pub fn trans_static<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>,
         base::set_link_section(ccx, g, attrs);
 
         if attr::contains_name(attrs, "used") {
-            ccx.used_statics().borrow_mut().push(g);
+            let cast = llvm::LLVMConstPointerCast(g, Type::i8p(ccx).to_ref());
+            ccx.used_statics().borrow_mut().push(cast);
         }
 
         Ok(g)