我在尝试运行GNU Readline库示例代码available in wikipedia时遇到问题。在这里:
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <readline/readline.h>
#include <readline/history.h>
int main()
{
char* input, shell_prompt[100];
// Configure readline to auto-complete paths when the tab key is hit.
rl_bind_key('\t', rl_complete);
for(;;) {
// Create prompt string from user name and current working directory.
snprintf(shell_prompt, sizeof(shell_prompt), "%s:%s $ ", getenv("USER"), getcwd(NULL, 1024));
// Display prompt and read input (n.b. input must be freed after use)...
input = readline(shell_prompt);
// Check for EOF.
if (!input)
break;
// Add input to history.
add_history(input);
// Do stuff...
// Free input.
free(input);
}
}
我正在限制环境,因为readline不可用,所以我必须下载源代码,编译它并将其安装到我的家庭目录。
这是我的主目录中的结构:
.local
├── include
│ └── readline
│ ├── chardefs.h
│ ├── history.h
│ ├── keymaps.h
│ ├── readline.h
│ ├── rlconf.h
│ ├── rlstdc.h
│ ├── rltypedefs.h
│ └── tilde.h
└── lib
├── libhistory.a
├── libhistory.so -> libhistory.so.6
├── libhistory.so.6 -> libhistory.so.6.2
├── libhistory.so.6.2
├── libreadline.a
├── libreadline.so -> libreadline.so.6
├── libreadline.so.6 -> libreadline.so.6.2
└── libreadline.so.6.2
问题是,当我调用gcc时,它会抛出一个错误:
$ gcc hello.c -o hello_c.o -I /home/my-home-dir/.local/include
/tmp/cckC236E.o: In function `main':
hello.c:(.text+0xa): undefined reference to `rl_complete'
hello.c:(.text+0x14): undefined reference to `rl_bind_key'
hello.c:(.text+0x60): undefined reference to `readline'
hello.c:(.text+0x77): undefined reference to `add_history'
collect2: error: ld returned 1 exit status
有一个关于这个here的答案,但我没有使用Netbeans,我不太确定如何在命令行上指定库的路径。
我试图告诉链接器库的位置,但结果仍然相同:
$ gcc hello.c -o hello_c.o -I /home/my-home-dir/.local/include -Xlinker "-L /home/my-home-dir/.local/lib"
/tmp/cceiePMr.o: In function `main':
hello.c:(.text+0xa): undefined reference to `rl_complete'
hello.c:(.text+0x14): undefined reference to `rl_bind_key'
hello.c:(.text+0x60): undefined reference to `readline'
hello.c:(.text+0x77): undefined reference to `add_history'
collect2: error: ld returned 1 exit status
我在这里可能缺少什么想法?
答案 0 :(得分:18)
您需要使用gcc参数中的-readline链接实际库