From d596eff7932d22b821aa52727e659e34dd8eb465 Mon Sep 17 00:00:00 2001
From: "Emil J. Tywoniak" <emil@tywoniak.eu>
Date: Fri, 12 Dec 2025 16:14:54 +0100
Subject: [PATCH] Makefile: enable ubsan by default for debug builds

---
 Makefile | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Makefile b/Makefile
index 3fc5f4d07..6057c46b9 100644
--- a/Makefile
+++ b/Makefile
@@ -81,6 +81,10 @@ ifeq ($(ENABLE_PYOSYS),1)
 ENABLE_LIBYOSYS := 1
 endif
 
+ifeq ($(ENABLE_DEBUG),1)
+SANITIZER = undefined
+endif
+
 BINDIR := $(PREFIX)/bin
 LIBDIR := $(PREFIX)/lib/$(PROGRAM_PREFIX)yosys
 DATDIR := $(PREFIX)/share/$(PROGRAM_PREFIX)yosys
@@ -777,6 +781,7 @@ libyosys.a: $(filter-out kernel/driver.o,$(OBJS))
 
 %.o: %.cc
 	$(Q) mkdir -p $(dir $@)
+	echo $(CXX) -o $@ -c $(CPPFLAGS) $(CXXFLAGS) $<
 	$(P) $(CXX) -o $@ -c $(CPPFLAGS) $(CXXFLAGS) $<
 
 %.pyh: %.h