对’readline’的未定义引用
我在尝试运行维基百科中 提供的GNU Readline库示例代码时遇到问题。 它来了:
#include #include #include #include #include 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 (nb 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); } }
我正在创建一个受限制的环境,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
这里有一个答案,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?
您需要使用gcc参数中的-lreadline来链接实际库