Update some tests and improve Makefile.

regress/Makefile

@@ -1,22 +1,30 @@
 TESTS!= echo *.sh
+LOGDIR=logs
 
-.PHONY: all $(TESTS)
-.NOTPARALLEL: all $(TESTS)
+.PHONY: all
+.NOTPARALLEL: all
 
 all:
-	@failed=0; failures=; \
+	@mkdir -p "$(LOGDIR)"; \
+	rm -f "$(LOGDIR)"/*.log; \
+	failed=0; failures=; \
 	for test in $(TESTS); do \
+		base=$${test##*/}; \
+		log="$(LOGDIR)/$${base%.sh}.log"; \
+		rm -f "$$log"; \
 		printf '%-40s ' "$$test"; \
 		start=$$(date +%s); \
 		ASAN_OPTIONS="abort_on_error=1:detect_leaks=0:$$ASAN_OPTIONS"; \
 		env -i LC_CTYPE=C.UTF-8 ASAN_OPTIONS="$$ASAN_OPTIONS" \
-		    sh "$$test" >/dev/null 2>&1; \
+		    sh -x "$$test" >"$$log" 2>&1; \
 		if [ $$? -eq 0 ]; then \
 			end=$$(date +%s); \
+			rm -f "$$log"; \
 			echo "PASS ($$((end - start))s)"; \
 		else \
 			end=$$(date +%s); \
 			echo "FAIL ($$((end - start))s)"; \
+			echo " log: $$log"; \
 			failed=1; \
 			failures="$$failures $$test"; \
 		fi; \
@@ -28,9 +36,7 @@ all:
 		for test in $$failures; do \
 			echo " $$test"; \
 		done; \
+	else \
+		rmdir "$(LOGDIR)" 2>/dev/null || true; \
 	fi; \
 	exit $$failed
-
-$(TESTS):
-	sh $@
-	sleep 1