c - undefined reference to `readline' -

c - undefined reference to `readline' -

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'undefined reference' errors when compiling against library 1 reply

i'm having problem trying run gnu readline library sample code available in wikipedia. here goes:

#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 auto-complete paths when tab key hit. rl_bind_key('\t', rl_complete); for(;;) { // create prompt string user name , current working directory. snprintf(shell_prompt, sizeof(shell_prompt), "%s:%s $ ", getenv("user"), getcwd(null, 1024)); // display prompt , read input (n.b. input must freed after use)... input = readline(shell_prompt); // check eof. if (!input) break; // add together input history. add_history(input); // stuff... // free input. free(input); } }

i'm working on restricted environment readline not available, had download sources, compile , install home dir.

this construction within home directory:

.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

the problem is, when phone call gcc throws me error:

$ 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 `rl_complete' hello.c:(.text+0x14): undefined reference `rl_bind_key' hello.c:(.text+0x60): undefined reference `readline' hello.c:(.text+0x77): undefined reference `add_history' collect2: error: ld returned 1 exit status

there reply here, i'm not using netbeans , i'm not quite sure how specify path library on command line.

i tried tell linker libraries are, result still same:

$ 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 `rl_complete' hello.c:(.text+0x14): undefined reference `rl_bind_key' hello.c:(.text+0x60): undefined reference `readline' hello.c:(.text+0x77): undefined reference `add_history' collect2: error: ld returned 1 exit status

any ideas might missing here?

you need link againts actual library using -lreadline in gcc arguments

c readline libreadline