+# These seem to be more modern options for enabling coverage testing.
+# Documenting them here in case a future version bump disables --coverage.
+#debug: CCFLAGS += -ftest-coverage
+#debug: CCFLAGS += -fprofile-arcs
+
+debug: CCFLAGS += -O0
+debug: CCFLAGS += --coverage
+debug: CCFLAGS += -ggdb
+debug: CCFLAGS += -U_FORTIFY_SOURCE
+debug: CCFLAGS += -fsanitize=address
+debug: CCFLAGS += -fsanitize=undefined