我在添加 -l ssl 和 -l crypto
时遇到了一系列错误。但是我不知道我需要安装哪个版本的库
/usr/include/boost/asio/ssl/detail/openssl_init.hpp:48: undefined reference to `SSL_library_init'
/usr/include/boost/asio/ssl/detail/openssl_init.hpp:49: undefined reference to `SSL_load_error_strings'
/usr/include/boost/asio/ssl/detail/openssl_init.hpp:50: undefined reference to `SSL_library_init'
/usr/include/boost/asio/ssl/detail/openssl_init.hpp:52: undefined reference to `CRYPTO_num_locks'
/usr/include/boost/asio/ssl/detail/openssl_init.hpp:55: undefined reference to `CRYPTO_set_locking_callback'
/usr/include/boost/asio/ssl/detail/openssl_init.hpp:56: undefined reference to `CRYPTO_set_id_callback'
/usr/include/boost/asio/ssl/detail/openssl_init.hpp:48: undefined reference to `SSL_library_init'
/usr/include/boost/asio/ssl/detail/openssl_init.hpp:49: undefined reference to `SSL_load_error_strings'
有很多选项比如
Note, selecting 'libss7-dbg' for regex 'libssl*'
Note, selecting 'libssl0.9.8-dbg' for regex 'libssl*'
Note, selecting 'libss7-dev' for regex 'libssl*'
Note, selecting 'libssl0.9.8' for regex 'libssl*'
Note, selecting 'libss2' for regex 'libssl*'
Note, selecting 'libssm-dev' for regex 'libssl*'
Note, selecting 'libssl' for regex 'libssl*'
Note, selecting 'libssh-4' for regex 'libssl*'
Note, selecting 'libssh-2-dev' for regex 'libssl*'
Note, selecting 'libssh-2-doc' for regex 'libssl*'
Note, selecting 'libssl1.0.0' for regex 'libssl*'
Note, selecting 'libsscm3' for regex 'libssl*'
Note, selecting 'libssl-ocaml-dev' instead of 'libssl-ocaml-dev-l8h98'
Note, selecting 'libssl-ocaml' instead of 'libssl-ocaml-l8h98'
Note, selecting 'libssreflect-ocaml' instead of 'libssreflect-ocaml-kevs8'
Note, selecting 'libssreflect-ocaml-dev' instead of 'libssreflect-ocaml-dev-kevs8'
Note, selecting 'python-libssh2' instead of 'python2.7-libssh2'
libss2 is already the newest version.
和
Note, selecting 'libcryptokit-ocaml' for regex 'libcrypto*'
Note, selecting 'libcryptokit-ocaml-02n31' for regex 'libcrypto*'
Note, selecting 'libcryptgps-ocaml-dev' for regex 'libcrypto*'
Note, selecting 'libcrypt-blowfish-perl' for regex 'libcrypto*'
Note, selecting 'libcrypt-saltedhash-perl' for regex 'libcrypto*'
Note, selecting 'libcrypt-gcrypt-perl' for regex 'libcrypto*'
Note, selecting 'libcryptui' for regex 'libcrypto*'
Note, selecting 'libcrypt-generatepassword-perl' for regex 'libcrypto*'
Note, selecting 'libcrypt-dh-gmp-perl' for regex 'libcrypto*'
Note, selecting 'libcrypt-cbc-perl' for regex 'libcrypto*'
Note, selecting 'libcrypt-dsa-perl' for regex 'libcrypto*'
Note, selecting 'libcrypt-dh-perl' for regex 'libcrypto*'
Note, selecting 'libcrypt-openssl-bignum-perl' for regex 'libcrypto*'
Note, selecting 'libcryptgps-ocaml-dev' instead of 'libcryptgps-ocaml-dev-1zmb9'
Note, selecting 'libcryptokit-ocaml' instead of 'libcryptokit-ocaml-02n31'
Note, selecting 'libcryptokit-ocaml-dev' instead of 'libcryptokit-ocaml-dev-02n31'
g++ -pthread -l ssl -lcrypto IpcManagerMain.cpp -o IpcManagerMain.o -lentity++ -lpersistence++ -lplatform++ -lreflection++ -lmonitor++ -lmeta++ -lipc++ -lbroadcast++ -lutilities++ -L/usr/lib -lboost_serialization -lboost_thread-mt -lboost_date_time -lboost_iostreams -lboost_program_options -lboost_filesystem -lboost_system
还有很多,但我已经缩短了。有人可以指出我正确的方向吗?
最佳答案
想象一下(假想的)链接器试图链接这些模块:
link moda modb modc modd
链接器不会(出于效率原因)记录它在 moda
中看到的所有符号,以尝试将它们与 modb
中的符号匹配。例如,如果 moda
是一个巨大的库,那么如果在整个过程中记住 moda
的所有符号,那么链接过程会变得非常缓慢(并且消耗内存)。
因此,链接器总是只记住(到目前为止)丢失的符号,并尝试在之后出现的模块中找到它们。请注意,这仅适用于图书馆。这是因为同一库/应用程序的对象可能具有循环依赖性。
这意味着例如 modb
的缺失符号仅在 modc
和 modd
中搜索,不 在 moda
中(同样,如果 moda
、modc
和 modd
是库)。
因此,如果您有 modx
使用 mody
的符号,那么您必须在 之后提及
在链接命令中。mody
>modx
例如,如果您有文件 main.o
、funcs.o
和 libmatrix.a
,那么您需要编写链接命令如下:
gcc funcs.o main.o -lmatrix
否则,如果您编写 gcc -lmatrix funcs.o main.o
,libmatrix.a
的符号将对 funcs.o< 不可见
和 main.o
。
关于c++ - 在 Ubuntu 12.04.1 LTS libssl libcrypto 上取消定义引用,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/13625700/