Add build rules for building a library from src/utils files

This is an initial step on providing an alternative build system that
uses libraries from src subdirectories.

src/Makefile

@@ -1,7 +1,7 @@
 SUBDIRS=common crypto drivers hlr_auc_gw eapol_auth eapol_supp eap_common eap_peer eap_server l2_packet radius rsn_supp tls utils wps
 
 all:
-	@echo Nothing to be made.
+	for d in $(SUBDIRS); do [ -d $$d ] && $(MAKE) -C $$d; done
 
 clean:
 	for d in $(SUBDIRS); do [ -d $$d ] && $(MAKE) -C $$d clean; done

src/utils/.gitignore

@@ -0,0 +1 @@
+libutils.a

src/utils/Makefile

@@ -1,9 +1,40 @@
-all:
-	@echo Nothing to be made.
+all: libutils.a
 
 clean:
 	for d in $(SUBDIRS); do make -C $$d clean; done
-	rm -f *~ *.o *.d
+	rm -f *~ *.o *.d libutils.a
 
 install:
 	@echo Nothing to be made.
+
+
+ifndef CC
+CC=gcc
+endif
+
+ifndef CFLAGS
+CFLAGS = -MMD -O2 -Wall -g
+endif
+
+
+LIB_OBJS= \
+	base64.o \
+	common.o \
+	ip_addr.o \
+	radiotap.o \
+	uuid.o \
+	wpa_debug.o \
+	wpabuf.o
+
+# Pick correct OS wrapper implementation
+LIB_OBJS += os_unix.o
+
+# Pick correct event loop implementation
+LIB_OBJS += eloop.o
+
+#LIB_OBJS += pcsc_funcs.o
+
+libutils.a: $(LIB_OBJS)
+	$(AR) cr $@ $(LIB_OBJS)
+
+-include $(OBJS:%.o=%.d)