fix parallel compilation

nac3standalone/demo/run_demo.sh

@@ -8,5 +8,5 @@ if [ -z "$1" ]; then
 fi
 
 ../../target/release/nac3standalone $1
-clang -Wall -O2 -o $1.elf demo.c $1.o
+clang -Wall -O2 -o $1.elf demo.c module*.o
 ./$1.elf

nac3standalone/src/main.rs

@@ -141,7 +141,7 @@ fn main() {
             )
             .expect("couldn't create target machine");
         target_machine
-            .write_to_file(module, FileType::Object, Path::new(&(demo_name.to_owned() + ".o")))
+            .write_to_file(module, FileType::Object, Path::new(&format!("{}.o", module.get_name().to_str().unwrap())))
             .expect("couldn't write module to file");
 
         // println!("IR:\n{}", module.print_to_string().to_str().unwrap());