undefined reference to `uuid_generate'

[wwwnuwan]

Hi, I tried to construct a simple program to generate an uuid.

#include <stdio.h>
#include <uuid/uuid.h>
int main()
{
  get_uuid();
  return 1;
}

int get_uuid()
{
  uuid_t uuid;
  uuid_generate(uuid);
  return 1;
}

But it gives the following compilation error.

lsf@lsf-laptop:~/mesh_project/cexample$ gcc -o uuid_test uuid_test.c
/tmp/ccCgFyZU.o: In function `get_uuid':
uuid_test.c.text+0x3c): undefined reference to `uuid_generate'
collect2: ld returned 1 exit status

what goes wrong with my code? appreciate you every advice.
nuwan

[cas]

You forgot to link in the uuid library. Add -luuid to the end of your build command.

Simply including a header (except for standard C functions, and then not necessarily for math functions) generally isn't sufficient to get the functionality it describes. C doesn't specify a mechanism for tying headers to libraries, so you have to know to both #include the proper headers and link in the proper libraries.

[wwwnuwan]

thanks a lot. I am new to C. it works now.