交叉编译百度开放云的MQTT-c时遇到的问题总结

r囧r小猫 2022-08-23 00:58 132阅读 0赞

MQTT-c 依赖photo库  
photo库依赖libssl和libcrypto两个库,这两个库包在openssl中  
OpenSSL 是一个强大的安全套接字层密码库，囊括主要的密码算法、常用的密钥和证书封装管理功能及SSL协议，并提供丰富的应用程序供测试或其它目的使用。

昨天编译MQTT-c 出现错误：

arm-linux-gcc -c src/PublisherSync.c -I/home/whl/output/arm-linux/include  
arm-linux-gcc -o PublisherSync ConnectorSync.o PublisherSync.o -L/home/whl/output/arm-linux/lib -lpaho-mqtt3cs -I/home/whl/output/arm-linux/include -lrt  
/usr/local/arm/4.2.2-eabi/usr/bin-ccache/../lib/gcc/arm-unknown-linux-gnueabi/4.2.2/../../../../arm-unknown-linux-gnueabi/bin/ld: warning: libssl.so.1.0.0, needed by /home/whl/output/arm-linux/lib/libpaho-mqtt3cs.so, not found (try using -rpath or -rpath-link)  
/usr/local/arm/4.2.2-eabi/usr/bin-ccache/../lib/gcc/arm-unknown-linux-gnueabi/4.2.2/../../../../arm-unknown-linux-gnueabi/bin/ld: warning: libcrypto.so.1.0.0, needed by /home/whl/output/arm-linux/lib/libpaho-mqtt3cs.so, not found (try using -rpath or -rpath-link)  
/home/whl/output/arm-linux/lib/libpaho-mqtt3cs.so: undefined reference to `SSL_connect' /home/whl/output/arm-linux/lib/libpaho-mqtt3cs.so: undefined reference to`ERR\_print\_errors\_fp’  
/home/whl/output/arm-linux/lib/libpaho-mqtt3cs.so: undefined reference to `SSL_get1_session' /home/whl/output/arm-linux/lib/libpaho-mqtt3cs.so: undefined reference to`CRYPTO\_set\_locking\_callback’  
/home/whl/output/arm-linux/lib/libpaho-mqtt3cs.so: undefined reference to `SSL_set_session' /home/whl/output/arm-linux/lib/libpaho-mqtt3cs.so: undefined reference to`OPENSSL\_add\_all\_algorithms\_noconf’  
/home/whl/output/arm-linux/lib/libpaho-mqtt3cs.so: undefined reference to `SSL_CTX_set_verify' /home/whl/output/arm-linux/lib/libpaho-mqtt3cs.so: undefined reference to`SSL\_load\_error\_strings’  
/home/whl/output/arm-linux/lib/libpaho-mqtt3cs.so: undefined reference to `SSL_get_cipher_list' /home/whl/output/arm-linux/lib/libpaho-mqtt3cs.so: undefined reference to`SSLeay\_version’  
/home/whl/output/arm-linux/lib/libpaho-mqtt3cs.so: undefined reference to `SSL_CTX_use_certificate_chain_file' /home/whl/output/arm-linux/lib/libpaho-mqtt3cs.so: undefined reference to`SSL\_free’  
/home/whl/output/arm-linux/lib/libpaho-mqtt3cs.so: undefined reference to `SSL_CTX_set_default_passwd_cb_userdata' /home/whl/output/arm-linux/lib/libpaho-mqtt3cs.so: undefined reference to`SSL\_CTX\_new’  
/home/whl/output/arm-linux/lib/libpaho-mqtt3cs.so: undefined reference to `SSL_get_verify_result' /home/whl/output/arm-linux/lib/libpaho-mqtt3cs.so: undefined reference to`SSL\_read’  
/home/whl/output/arm-linux/lib/libpaho-mqtt3cs.so: undefined reference to `SSL_set_fd' /home/whl/output/arm-linux/lib/libpaho-mqtt3cs.so: undefined reference to`SSL\_pending’

这个错误很奇怪，排查了好久，因为同样的Makefile文件，交叉编译 时就报错，编译 x86版本时就很正常。  
后来google到要在编译时加上 -lssl -lcrypto,就可以顺利编译通过了。