Linux上GCC中的编译错误

我试图为编译代码，但编译时会出现以下错误

我已经检查了

gnutls.h

是否存在于我的系统中

/usr/include/gnutls/

原因还可能是什么

gcc -o tls.o tls.c  
/tmp/ccfyZ1Bd.o: In function `main':  
tls.c:(.text+0x1c): undefined reference to `gnutls_global_init'  
tls.c:(.text+0x28): undefined reference to `gnutls_anon_allocate_client_credentials'  
tls.c:(.text+0x3c): undefined reference to `gnutls_init'  
tls.c:(.text+0x58): undefined reference to `gnutls_priority_set_direct'  
tls.c:(.text+0x74): undefined reference to `gnutls_credentials_set'  
tls.c:(.text+0x79): undefined reference to `tcp_connect'  
tls.c:(.text+0x91): undefined reference to `gnutls_transport_set_ptr'  
tls.c:(.text+0x9d): undefined reference to `gnutls_handshake'
tls.c:(.text+0xdc): undefined reference to `gnutls_perror'  
tls.c:(.text+0x109): undefined reference to `gnutls_record_send'  
tls.c:(.text+0x125): undefined reference to `gnutls_record_recv'  
tls.c:(.text+0x154): undefined reference to `gnutls_strerror'  
tls.c:(.text+0x1e6): undefined reference to `gnutls_bye'  
tls.c:(.text+0x1f2): undefined reference to `tcp_close'  
tls.c:(.text+0x1fe): undefined reference to `gnutls_deinit'  
tls.c:(.text+0x20a): undefined reference to `gnutls_anon_free_client_credentials'  
tls.c:(.text+0x20f): undefined reference to `gnutls_global_deinit'  
collect2: ld returned 1 exit status

---

这是一个链接错误。您需要包括一些带有

-l

标志的库。在不知道您的设置的情况下进行猜测，我会尝试

-lgnutls

您已要求gcc输出一个文件tls.o。通常*.o文件是已编译但未链接的目标文件。但默认情况下，gcc尝试链接其输入。如果您打算编译但尚未链接，请为gcc提供

-c

标志。