gcc wont compile and run MySQL C libraries

Question

#include <my_global.h>
#include <mysql.h>

int main(int argc, char **argv)
{
  printf("MySQL client version: %s\n", mysql_get_client_info());
}

~$ gcc -o mysql-test MySQL-Test.c

im trying to execute this test program from terminal but get the following error message:

/tmp/cceEmI0I.o: In function main': MySQL-Test.c:(.text+0xa): undefined reference tomysql_get_client_info'

what is wrong? my system is ubuntu

Answer 1

You are not linking to the libraries. Use: gcc -llibrarygoeshere -o mysql-test MySQL-Test.c See here for more information about linking with gcc.

Answer 2

You need gcc -o mysql-test MySQL-Test.c -L/usr/local/mysql/lib -lmysqlclient -lz

Replace -L/usr/local/mysql/lib with wherever you client library is (if it isn't already in your libpath)

See the MySql instructions for building clients.

Answer 3

It is not a compilation error. It is a link error.

Add the mysql library to create your executable with option -lmysql should do the trick.

Answer 4

You forgot to link against the MySQL library. Try adding -lmysql to your compilation line.

See http://www.adp-gmbh.ch/cpp/gcc/create_lib.html for more information.

Answer 5

MySQL comes with a special script called mysql_config. It provides you with useful information for compiling your MySQL client and connecting it to MySQL database server.

Pass --libs option - Libraries and options required to link with the MySQL client library.

$ mysql_config --libs

Typical Output:

-L/usr/lib64/mysql -lmysqlclient -lz -lcrypt -lnsl -lm -L/usr/lib64 -lssl -lcrypto

Now you can add this to your compile/link line:

gcc -o mysql-test MySQL-Test.c $(mysql_config --libs)