c - 在编译 freeRTOS 期间在函数 vPortStartFirstTask 中收到警告，但程序正在运行

Question

每当我在 freeRTOS 中编译我的项目时，都会收到以下警告。

/port.c: In function 'vPortStartFirstTask': ../../../../third_party/RTOS/FreeRTOS/Source/portable/port.c:194:1: warning: stack usage computation not supported for this target [enabled by default] } ^

这是函数

void vPortStartFirstTask( void )
{
    /* The MSP stack is not reset as, unlike on M3/4 parts, there is no vector
    table offset register that can be used to locate the initial stack value.
    Not all M0 parts have the application vector table at address 0. */

    __asm volatile(
    "   ldr r2, pxCurrentTCBConst2  \n" /* Obtain location of pxCurrentTCB. */
    "   ldr r3, [r2]                \n"
    "   ldr r0, [r3]                \n" /* The first item in pxCurrentTCB is the task top of stack. */
    "   add r0, #32                 \n" /* Discard everything up to r0. */
    "   msr psp, r0                 \n" /* This is now the new top of stack to use in the task. */
    "   movs r0, #2                 \n" /* Switch to the psp stack. */
    "   msr CONTROL, r0             \n"
    "   pop {r0-r5}                 \n" /* Pop the registers that are saved automatically. */
    "   mov lr, r5                  \n" /* lr is now in r5. */
    "   cpsie i                     \n" /* The first task has its context and interrupts can be enabled. */
    "   pop {pc}                    \n" /* Finally, pop the PC to jump to the user defined task code. */
    "                               \n"
    "   .align 2                    \n"
    "pxCurrentTCBConst2: .word pxCurrentTCB   "
                  );
}

请帮助我消除特定警告，任何人都请告诉我为什么会收到此消息。

Answer 1

你得到这个警告是因为你试图用 GCC's stack usage analysis 编译你的程序已打开，但您的平台不支持它。

要消除它，请在不使用 -fstack-usage 编译器开关的情况下编译您的程序 - 这可能是由您的 makefile 或 IDE 添加的，我不确定您是如何构建项目的。