Build a code coverage report with gcov and lcov (#1221)

contrib/coverage.bash

@@ -0,0 +1,27 @@
+#!/usr/bin/env bash
+set -e
+
+# Build RGBDS with gcov support
+make coverage -j
+
+# Run the tests
+for dir in asm link fix gfx; do
+	pushd test/$dir
+	./test.sh
+	popd
+done
+
+# Generate coverage logs
+gcov src/**/*.{c,cpp}
+mkdir -p coverage
+
+# Generate coverage report
+lcov -c --no-external -d . -o coverage/coverage.info
+genhtml -f -s -o coverage/ coverage/coverage.info
+
+# Open report in web browser
+if [ "$(uname)" == "Darwin" ]; then
+  open coverage/index.html
+else
+  xdg-open coverage/index.html
+fi