"undefined reference"

linuxcub · 08-09-2011, 05:42 PM

Hi guys,

I'm trying to link the following code in linux:

#include "./rsl-v1.42/rsl.h"
void main(int argc, char **argv)
{
Radar *radar;
radar = RSL_anyformat_to_radar("CAT091013010219.RAWLM7B", NULL);
}

with the command line: cc -o code code.o

and in which the function RSL_anyformat_to_radar in declared inside rsl.h

and I receive the following error:

code.o: In function `main':
code.c

.text+0x19): undefined reference to `RSL_anyformat_to_radar'
collect2: ld returned 1 exit status

could anybody help me?

thanks a lot

allwimb · 08-09-2011, 05:58 PM

when you get a such error that means that the function you're calling doesn't exist or it hasn't been defined. Check if it exists in the header you included.

spring logout

linuxcub · 08-09-2011, 06:15 PM

thanks for quick replying allwimb

the function in question is declared inside rsl.h as:

/* Prototypes for functions. */
/* Alphabetical and grouped by object returned. */

Radar *RSL_africa_to_radar(char *infile);
Radar *RSL_anyformat_to_radar(char *infile, ...);
Radar *RSL_dorade_to_radar(char *infile);

any other suggestion?

Nylex · 08-10-2011, 12:28 AM

Quote:

Originally Posted by allwimb

when you get a such error that means that the function you're calling doesn't exist or it hasn't been defined. Check if it exists in the header you included.

This is incorrect. It's a linker error. You need to link the object files containing the code for the functions you're using. For gcc, you'd use the -l option (if you have e.g. "libradar.so"), or just put the object files on the command line (e.g. gcc -o code code.o radar.o). Check the man page for your compiler to see what the options are. Presumably, they'll be similar though.

Edit: actually, you're probably using gcc, aren't you?

Tinkster · 08-10-2011, 12:50 AM

Moved: This thread is more suitable in <PROGRAMMING> and has been moved accordingly to help your thread/question get the exposure it deserves.