Enhancement in test Makefile

tests/Makefile

@@ -8,12 +8,12 @@ DEPS=$(wildcard ../*.o)
 all: checks
 
 checks: $(BINARIES) $(SOURCES)
-	for test_bin in $(BINARIES); do echo "Running $${test_bin}.c"; ./$$test_bin && echo "OK" || echo "fail"; done
+	for test_bin in $(BINARIES); do echo "Running $${test_bin}.c"; ./$$test_bin && echo "OK" || false; done;
 
 ../%.o:
 	$(MAKE) -C .. `basename "$@"`
 
-%.o: %.c
+%.o: %.c $(DEPS)
 	$(CC) -I .. $(CFLAGS) -c -o $@ $<
 
 test_rpn: test_rpn.o ../rpn_lib.o ../rpn_jit_cov.o ../rpn_parse_cov.o ../rpn_if_cov.o ../rpn_if_default_cov.o