[rtl] Questions about compiling RT-linux codes using g++

[wangsg@ercrms33.engin.umich.edu]

Hello,

Our group tried rt-linux recently, and can not get our C++ program works.
The problem is when we tried to insmod the object code, it gave all
rt function calls (rt_task_init, rt_task_wait, ...) as unresolved symbols.

The code is really simple, doing nothing except printk("Hello\n"). We add
-D__KERNEL__ and -D__RT__ options when using g++

Can anyone tell me what's wrong with it and how to fix it? Or g++ is
totally not usable for rt-linux?

Thanks.

Shige Wang
RTCL
EECS
UM
-----------------------------------
PS. Here are the code, our compile command and error message:

#define MODULE

#include <linux/types.h>
#include <linux/module.h>
#include <linux/rt_sched.h>
#include <linux/kernel.h>
#include <linux/version.h>

RT_TASK task[1];

void getMem(int task)
{

  while (1) {
	printk("Hello\n");
  }
  
  rt_task_wait();
  }
}

int init_module(void) 
{
   printk("Start it...\n");

   rt_task_init(&task[0], getMem, 1, 100000, 1);
   rt_task_make_periodic(&task[0], rt_get_time(), \
	(RTIME)(RT_TICKS_PER_SEC/10000 ));

   return 0;
}

void cleanup_module(void)
{
   rt_task_delete(&task[0]);
}

[ercrms33]#g++ -g -c memalloc.cpp -D__KERNEL__ -D__RT__

[ercrms33]#/sbin/insmod memalloc.o  

memalloc.o: unresolved symbol rt_task_init__FP14rt_task_structPFi_viii
memalloc.o: unresolved symbol rt_task_wait__Fv
memalloc.o: unresolved symbol rt_get_time__Fv
memalloc.o: unresolved symbol rt_task_delete__FP14rt_task_struct
memalloc.o: unresolved symbol rt_task_make_periodic__FP14rt_task_structxx      

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