From 12d39ef72b25fc8137818718782934e01da88c9c Mon Sep 17 00:00:00 2001
From: "Eric S. Raymond" <esr@thyrsus.com>
Date: Mon, 6 Mar 2023 12:23:40 -0500
Subject: [PATCH] Improve Makefile recipe for coverage testing.

---
 Makefile | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index 38139de..eebc68c 100644
--- a/Makefile
+++ b/Makefile
@@ -65,10 +65,12 @@ cheat: $(CHEAT_OBJS) dungeon.o
 check: advent cheat
 	cd tests; $(MAKE) --quiet
 
+# Requires gcov, lcov, libasan6, and libubsan1
+# The last two are Ubuntu names, might vary onb other distributions.
 # After this, run your browser on coverage/open-adventure/index.html
 # to see coverage results. Browse coverage/adventure.yaml.html
 # to see symbol coverage over the YAML file.
-coverage: debug
+coverage: clean debug
 	cd tests; $(MAKE) coverage --quiet
 
 .SUFFIXES: .adoc .html .6
@@ -129,6 +131,11 @@ linty: CCFLAGS += -Winit-self
 linty: CCFLAGS += -Wpointer-arith
 linty: advent cheat
 
+# These seem to be more modeern 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
-- 
2.31.1