在使用malloc/new时无法编译stm32l4r5xx

我遇到了一个奇怪的问题。我使用 Eclipse Oxygen.2、windows 10、J-linker、STM32L4R5ZI、STM32CubeMX V1.0 ver 4.26.0。

问题： 我可以编译我的程序并在uC上运行它们，但是每当我想使用"malloc"或"new"函数时，我都无法编译我的项目并收到以下消息：

../system/src/newlib/_sbrk.c:84: undefined reference to `_Heap_Begin'
../system/src/newlib/_sbrk.c:84: undefined reference to `_Heap_Limit'

有谁知道如何解决它？

主要功能：

int main(void)
{
HAL_Init();
SystemClock_Config();
uint8_t *tab = malloc(100);    
MX_GPIO_Init();
MX_TIM1_Init();      
HAL_TIM_OC_Start_IT(&htim1, TIM_CHANNEL_1);      
HAL_GPIO_TogglePin(GPIOB, GPIO_PIN_7);
while (1)
{    
}    
}

_sbrk.c：

_sbrk(int incr)
{
extern char _Heap_Begin; // Defined by the linker.
extern char _Heap_Limit; // Defined by the linker.
static char* current_heap_end;
char* current_block_address;
if (current_heap_end == 0)
{
current_heap_end = &_Heap_Begin;
}
current_block_address = current_heap_end;
// Need to align heap to word boundary, else will get
// hard faults on Cortex-M0. So we assume that heap starts on
// word boundary, hence make sure we always add a multiple of
// 4 to it.
incr = (incr + 3) & (~3); // align value to 4
if (current_heap_end + incr > &_Heap_Limit)
{
// Some of the libstdc++-v3 tests rely upon detecting
// out of memory errors, so do not abort here.
#if 0
extern void abort (void);
_write (1, "_sbrk: Heap and stack collisionn", 32);
abort ();
#else
// Heap has overflowed
errno = ENOMEM;
return (caddr_t) - 1;
#endif
}
current_heap_end += incr;
return (caddr_t) current_block_address;
}