我为我的外壳实现了历史记录，但出现了错误 [英] I implement history for my shell and i have a error

问题描述

我使用readline实现历史记录，但出现错误

来自用户的代码:

I implement history with readline and I have an error

code from user:

#include<readline readline.h="">
#include<readline history.h="">
int main(){
char *line4;
while(1)
{
line4 = readline("Commander Shepard >");       
	add_history(line4);
}
}

我尝试过的事情:

What I have tried:

p.c:(.text+0x1478): undefined reference to `readline'
p.c:(.text+0x148e): undefined reference to `add_history'
Compailing with -lreadline or -readline I have another error
gcc: error: p: No such file or directory

推荐答案

转到GNU Readline库 [

Go to The GNU Readline Library[^], where everything is explained.

我假设已经安装了库和头文件.否则，您将收到有关缺少包含文件的编译器错误.

编译和单行链接时，必须在源文件之后传递库:

I assume that the library and the header files has been installed. Otherwise you would get a compiler error about missing include files.

You must pass the libraries after the source files when compiling and linking with a single line:

gcc -Wall source-file.cpp -lreadline -o program-name

常见的gcc选项顺序如下:

• 编译器选项，例如优化和包含路径
• 源文件
• 链接器选项，例如库和库路径
• Output


The common gcc option sequence is then:




• Compiler options like optimising and include pathes
• Source files
• Linker options like libraries and library pathes
• Output

gcc -Wall -c source-file.cpp
gcc source-file.o -lreadline -o program-name




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