嵌入式操作系统内核的代码覆盖率统计

你好，统计嵌入式操作系统内核代码覆盖率，我将'-fprofile-arcs -ftest-coverage'加到了编译参数和链接参数中，会编译内核所有代码，可以编译成功，将bin文件烧到开发板上的时候，执行application中的main.c，没有输出gcda文件。只打印了
'Gcov End gcov_exit'。
初步分析是 `__gcov_exit` 中的 `listptr` 为空，请问下可能是什么原因

```
void __gcov_exit(void)
{
    GcovInfo *listptr = gcov_headGcov;

#ifdef GCOV_OPT_PRINT_STATUS
    GCOV_PRINT_STR("gcov_exit\n");
#endif // GCOV_OPT_PRINT_STATUS

while (listptr)
    {
		GCOV_PRINT_STR("gcov_data\n");
        gcov_unsigned_t *buffer = NULL; // Need buffer to be 32-bit-aligned for type-safe internal usage
        uint32_t bytesNeeded;

/* Do pretend conversion to see how many bytes are needed */
        bytesNeeded = gcov_convert_to_gcda(NULL, listptr->info);

if (bytesNeeded > sizeof(gcov_buf) / (sizeof(char)))
        {
            buffer = (gcov_unsigned_t *)NULL;
        }
        else
        {
            buffer = gcov_buf;
        }

if (!buffer)
        {
#ifdef GCOV_OPT_PRINT_STATUS
            GCOV_PRINT_STR("Out of memory!\n");
#endif // GCOV_OPT_PRINT_STATUS
            return;
        }

/* Do the real conversion into buffer */
        gcov_convert_to_gcda(buffer, listptr->info);

#if defined(GCOV_OPT_PRINT_STATUS) || defined(GCOV_OPT_OUTPUT_SERIAL_HEXDUMP)
        GCOV_PRINT_STR("Emitting ");
        GCOV_PRINT_NUM(bytesNeeded);
        GCOV_PRINT_STR(" bytes for ");
        GCOV_PRINT_STR(gcov_info_filename(listptr->info));
        GCOV_PRINT_STR("\n");
#endif

#ifdef GCOV_OPT_OUTPUT_SERIAL_HEXDUMP
        /* If your embedded system does not support printf or an imitation,
         * you'll need to change this code.
         */
        for (uint32_t i = 0; i < bytesNeeded; i++)
        {
            gcov_printf("\\x%02X", ((unsigned char *)buffer)[i]);
        }
        GCOV_PRINT_STR("\n");
#endif // GCOV_OPT_OUTPUT_SERIAL_HEXDUMP

/* Other output methods might be imagined,
         * if you have flash that can be written directly,
         * or the luxury of a filesystem, etc.
         */

listptr = listptr->next;
    } /* end while listptr */
```
main.c源码：

```
int main(void *arg)
{
	__gcov_call_constructors();
    rtos_task_id task_id;
	
    
    task_id = rtos_task_create(OS_NULL, OS_NULL, 4096, "leds", (void *)&task, NULL,1);
    rtos_task_startup(task_id);
	__gcov_exit();

return 0;
}
```

海南大学-刘伟/gcov

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