MQX new keyword using C++

[KJFPE]

Hi, 

Hopefully some can help I am having trouble with the new keyword using C++ below is some example code I am using MQX 3.6.2 and a Kinetis K60.

When the program reaches the line "Test *T1 = new Test;" it halts and generates an MQX_UNHANDLED_INTERRUPT(0x0041)

The same is also true for something as simple  as

int *p_scalar = new int(5);

Many thanks in advance

#define START_TASK 5

extern void Start_task(uint_32);

extern "C" const TASK_TEMPLATE_STRUCT  MQX_template_list[] = 

{ 

   /* Task Index,   Function,   Stack,  Priority, Name,     Attributes,          Param, Time Slice */

    { START_TASK,   Start_task, 1500,   5,        "hello",  MQX_AUTO_START_TASK, 0,     0 },

    { 0 }

};

class Test

{

public:  

  Test(void);

  ~Test(){};

  void Init(void);

  int xx;  

};

void Start_task(uint_32 initial_data)

{

 printf("Start Task\n"); 

    Test *T1 = new Test;

    T1->Init();

    while(T1->xx)

    {

  _time_delay(200); 

    }

  _mqx_exit(0);

}

void Test::Init(void)

{

    printf("Init\n"); 

  xx=1;  

}

Test::Test(void)

{

  printf("Constructor\n");   

  xx=0;

}

[unmannedrussery]

I struggled with this same problem for a while, and was confused at why the MQX C++ example project worked, but C++ code in my own project did not work. After consulting IAR support, it turns out that the solution is to re-direct the new() and delete() operators via the Linker Options in your project settings. Under Project>Options>Linker>Extra Options, check the "Use command line options" box, and add the folloiwing into the "Command Line Options" text box:

--redirect __iar_dlmalloc=malloc
--redirect __iar_dlcalloc=calloc
--redirect __iar_dlfree=free

This causes IAR redirects new() to __iar_dlmalloc(), and this linker option then redirects __iar_dlmalloc() to malloc(), which is redirected to the MQX _mem_alloc(). This seems like a roundabout way of doing it, but this is actually how Freescale accomplishes it in their C++ example project - take a look at the project settings and you'll find this in there.

Hope this helps!