diff --git a/gen/optimizer.h b/gen/optimizer.h
new file mode 100644
index 00000000..8e3cfebc
--- /dev/null
+++ b/gen/optimizer.h
@@ -0,0 +1,14 @@
+#ifndef LDC_GEN_OPTIMIZER_H
+#define LDC_GEN_OPTIMIZER_H
+
+namespace llvm { class Module; }
+
+bool ldc_optimize_module(llvm::Module* m);
+
+bool doInline();
+
+int optLevel();
+
+bool optimize();
+
+#endif
\ No newline at end of file