From 62e659ed6748e9f60b2a4aa25dd4fe79a9605881 Mon Sep 17 00:00:00 2001
From: bin <bin@sleepy.rs>
Date: Sun, 9 Aug 2026 19:21:54 +0100
Subject: [PATCH] Fix compilation with `NPNR_DISABLE_THREADS`.

---
 frontend/frontend_base.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/frontend/frontend_base.h b/frontend/frontend_base.h
index 5f0e6481..800f4ade 100644
--- a/frontend/frontend_base.h
+++ b/frontend/frontend_base.h
@@ -133,7 +133,9 @@ template <typename FrontendType> struct GenericFrontend
         m.prefix = "";
         m.path = top;
 
+#ifndef NPNR_DISABLE_THREADS
         std::lock_guard<std::mutex> lock(ctx->mutex);
+#endif
 
         ctx->top_module = top;
         // Do the actual import, starting from the top level module