From b06f9bdf18039bd643c2989921abbd87d554889a Mon Sep 17 00:00:00 2001
From: "Emil J. Tywoniak" <emil@tywoniak.eu>
Date: Tue, 12 May 2026 12:51:12 +0200
Subject: [PATCH] Makefile: error on unused variables

---
 Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index 543ec7f44..e95d6cace 100644
--- a/Makefile
+++ b/Makefile
@@ -104,7 +104,7 @@ VPATH := $(YOSYS_SRC)
 UNITESTPATH := $(YOSYS_SRC)/tests/unit
 
 export CXXSTD ?= c++17
-CXXFLAGS := $(CXXFLAGS) -Wall -Wextra -ggdb -I. -I"$(YOSYS_SRC)" -MD -MP -D_YOSYS_ -fPIC -I$(PREFIX)/include
+CXXFLAGS := $(CXXFLAGS) -Wall -Wextra -Werror=unused -ggdb -I. -I"$(YOSYS_SRC)" -MD -MP -D_YOSYS_ -fPIC -I$(PREFIX)/include
 LIBS := $(LIBS) -lstdc++ -lm
 PLUGIN_LINKFLAGS :=
 PLUGIN_LIBS :=