From 7aaa0621d359ab3f35d0934f355e6634db5da3d9 Mon Sep 17 00:00:00 2001
From: "Emil J. Tywoniak" <emil@tywoniak.eu>
Date: Thu, 19 Mar 2026 00:01:14 +0100
Subject: [PATCH] constmap: error if no -cell set

---
 passes/techmap/constmap.cc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/passes/techmap/constmap.cc b/passes/techmap/constmap.cc
index 6d18b8494..1df50e47d 100644
--- a/passes/techmap/constmap.cc
+++ b/passes/techmap/constmap.cc
@@ -71,6 +71,8 @@ struct ConstmapPass : public Pass {
 		}
 		extra_args(args, argidx, design);
 
+		if (celltype.empty())
+			log_cmd_error("Missing required option -cell.\n");
 
 		if (design->has(celltype)) {
 			Module *existing = design->module(celltype);