I implement history for my shell and i have a error

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I implement history with readline and I have an error

code from user:

C++

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

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

Posted 25-Feb-16 0:02am

Laurentiu Bobora

Updated 25-Feb-16 1:19am

Richard MacCutchan

v3

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Patrice T 25-Feb-16 6:14am

And may be you also have some source code.

Laurentiu Bobora 25-Feb-16 6:25am

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

Laurentiu Bobora 25-Feb-16 6:28am

#include readline readline.h
#include readline history.h

2 solutions

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Richard MacCutchan · Accepted Answer · 2016-02-25T01:19:00

Solution 2

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

Posted 25-Feb-16 1:19am

Richard MacCutchan

Jochen Arndt · Accepted Answer · 2016-02-25T01:10:00

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

The common gcc option sequence is then:

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

Or split compiling and linking into two commands:

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