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make[1]: Entering directory `/home/Nibuyongpinle/FOTA_Server/libcoap-master_new_05_15/examples'
cc -o coap-client client.o -L.. -lcoap -lcoap
../libcoap.a(common.o): In function `get_md5':
common.c:(.text+0x562): undefined reference to `MD5_Init'
common.c:(.text+0x586): undefined reference to `MD5_Update'
common.c:(.text+0x5eb): undefined reference to `MD5_Final'
52 coap-server: server.o $(libcoap)
53 $(CC) -o $@ $< $(COMMON_OPTION_O) $(LDFLAGS) -lcrypto -lssl -lpthread $(LDLIBS) $(COMMON_O)
因为我的COMMON_O依赖 lcrypto,所以需要放在它的前面
52 coap-server: server.o $(libcoap)
53 $(CC) -o $@ $< $(COMMON_OPTION_O) $(COMMON_O) $(LDFLAGS) -lcrypto -lssl -lpthread $(LDLIBS)