我在尝试运行wikipedia 中提供的GNU Readline库示例代码时遇到问题。它是这样的：
#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);
}
}
我在一个受限的环境中工作，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主目录。
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
这里有一个关于这个的答案，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在哪里，但结果还是一样：
$ 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
有什么我可能在这里遗漏的想法吗？