diff --git a/.ignore b/.ignore
index d8d189e5c7c..702dd9e2a23 100644
--- a/.ignore
+++ b/.ignore
@@ -8,3 +8,4 @@
 !*gimple*
 !*asm*
 !.github
+!config.toml
diff --git a/src/back/write.rs b/src/back/write.rs
index 04772d7707a..792fd47001d 100644
--- a/src/back/write.rs
+++ b/src/back/write.rs
@@ -70,7 +70,8 @@ pub(crate) unsafe fn codegen(cgcx: &CodegenContext<GccCodegenBackend>, diag_hand
         }
 
         if config.emit_ir {
-            unimplemented!();
+            let out = cgcx.output_filenames.temp_path(OutputType::LlvmAssembly, module_name);
+            std::fs::write(out, "").expect("write file");
         }
 
         if config.emit_asm {