c++ - 在 Linux 上编译外部库的问题

Question

所以我试图在 linux 上编译 libssh2 库，但是当我尝试编译例如它出现了很多错误，即使我包含了它要求的头文件，它仍然要求它。以下是错误消息和结果消息:

~/ gcc -include /home/Roosevelt/libssh2-1.2.5/src/libssh2_config.h -o lolbaise /home/Roosevelt/libssh2-1.2.5/example/scp.c
/home/Roosevelt/libssh2-1.2.5/example/scp.c:7:28: error: libssh2_config.h: No such file or directory
/home/Roosevelt/libssh2-1.2.5/example/scp.c: In function 'main':
/home/Roosevelt/libssh2-1.2.5/example/scp.c:39: error: storage size of 'sin' isn't known
/home/Roosevelt/libssh2-1.2.5/example/scp.c:81: error: 'AF_INET' undeclared (first use in this function)
/home/Roosevelt/libssh2-1.2.5/example/scp.c:81: error: (Each undeclared identifier is reported only once
/home/Roosevelt/libssh2-1.2.5/example/scp.c:81: error: for each function it appears in.)
/home/Roosevelt/libssh2-1.2.5/example/scp.c:81: error: 'SOCK_STREAM' undeclared (first use in this function)
/home/Roosevelt/libssh2-1.2.5/example/scp.c:87: error: invalid application of 'sizeof' to incomplete type 'struct sockaddr_in'

这是新的错误:

scp.c:(.text+0x106): undefined reference to `libssh2_init'
scp.c:(.text+0x1fe): undefined reference to `libssh2_session_init_ex'
scp.c:(.text+0x234): undefined reference to `libssh2_session_startup'
scp.c:(.text+0x288): undefined reference to `libssh2_hostkey_hash'
scp.c:(.text+0x36f): undefined reference to `libssh2_userauth_password_ex'
scp.c:(.text+0x3e7): undefined reference to `libssh2_userauth_publickey_fromfile_ex'
scp.c:(.text+0x437): undefined reference to `libssh2_scp_recv'
scp.c:(.text+0x531): undefined reference to `libssh2_channel_read_ex'
scp.c:(.text+0x5f8): undefined reference to `libssh2_channel_free'
scp.c:(.text+0x628): undefined reference to `libssh2_session_disconnect_ex'
scp.c:(.text+0x636): undefined reference to `libssh2_session_free'
scp.c:(.text+0x66e): undefined reference to `libssh2_exit'
collect2: ld returned 1 exit status

Answer 1

不包含头文件:libssh2_config.h

源代码中有一个包含指令，因此您必须使用 -I 选项指示 header 的路径:gcc -I/home/Roosevelt/libssh2-1.2 .5/源

-include 选项应用于包含一个头文件，该文件未通过 #include 指令明确包含在源代码中。