rtthread 对C++的支持问题，编译报错

发布于 2018-02-01 15:24:26 浏览：3885 订阅该版

![11.jpg](/uploads/201802/01/152104jx1x5x181mn8nzrv.jpg)```int cplusplus_system_init(void)
{
#if defined(__GNUC__) && !defined(__CC_ARM)
    typedef void (*pfunc) ();
<font color="#ff0000">    extern pfunc __ctors_start__[];
    extern pfunc __ctors_end__[];</font>
    pfunc *p;

for (p = __ctors_start__; p < __ctors_end__; p++)
        (*p)();

#elif defined(__CC_ARM)
    /* If there is no SHT$INIT_ARRAY, calling
     * $Super$__cpp_initialize__aeabi_() will cause fault. At least until Keil5.12
     * the problem still exists. So we have to initialize the C++ runtime by ourself.
     */
    typedef void PROC();
    extern const unsigned long SHT$INIT_ARRAY$Base[];
    extern const unsigned long SHT$INIT_ARRAY$Limit[];

const unsigned long *base = SHT$INIT_ARRAY$Base;
    const unsigned long *lim  = SHT$INIT_ARRAY$Limit;

for (; base != lim; base++)
    {
        PROC *proc = (PROC*)((const char*)base + *base);
        (*proc)();
    }
#endif

return 0;
}
INIT_COMPONENT_EXPORT(cplusplus_system_init);```
![11.jpg](/uploads/201802/01/152104jx1x5x181mn8nzrv.jpg)

在menuconfig 打开C++支持之后编译报错，错误是说上面代码中的那两个标号__ctors_start__ 和__ctors_end__ 没有定义，我在链接脚本中也没找见。
问题：上面那段代码的作用是什么，是要为C++初始化什么？是不是构造函数都放在那个段里面啊？