未定义参考`杀“ [英] Undefined reference to `kill'

问题描述

我开发了用于C.一个ARM7嵌入式系统现在我想为了使用一些C ++特性来编译和用C链接它++应用程序。要做到这一点，我使用 mipsel体系精灵-G ++ 而不是的mipsel体系精灵-GCC 。我可以编译我的code与 mipsel体系精灵-G ++ 成功，但在联步骤我得到的错误：

I developed an application for an ARM7 embedded system in C. Now I want to compile and link it with C++ in order to use some C++ features. To do this, I am using mipsel-elf-g++ instead of mipsel-elf-gcc. I can compile my code with mipsel-elf-g++ successfully, but in linking step I get the errors:

/opt/mipsel/lib/gcc/mipsel-elf/3.4.6 /../../../../ mipsel体系精灵/ lib目录/文件libc.a（lib_a-abort.o）：在功能```中止'：
  /cygdrive/d/Files/cross/mips/newlib-1.15.0/newlib/libc/s​​tdlib/abort.c:63：未定义引用 _exit'`

/opt/mipsel/lib/gcc/mipsel-elf/3.4.6/../../../../mipsel-elf/lib/libc.a(lib_a-abort.o): In function```abort': /cygdrive/d/Files/cross/mips/newlib-1.15.0/newlib/libc/stdlib/abort.c:63: undefined reference to_exit'`

/opt/mipsel/lib/gcc/mipsel-elf/3.4.6 /../../../../ mipsel体系精灵/ lib目录/文件libc.a（lib_a-signalr.o）：在功能```_kill_r：
  /cygdrive/d/Files/cross/mips/newlib-1.15.0/newlib/libc/reent/signalr.c:61：未定义引用 kill'`

/opt/mipsel/lib/gcc/mipsel-elf/3.4.6/../../../../mipsel-elf/lib/libc.a(lib_a-signalr.o): In function```_kill_r': /cygdrive/d/Files/cross/mips/newlib-1.15.0/newlib/libc/reent/signalr.c:61: undefined reference tokill'`

collect2：LD返回1退出状态

collect2: ld returned 1 exit status

我搜索了这个问题，并认为我应该实现自己的 _exit 和杀的功能，所以我加了这codeS到我的项目：

I searched about this issue and found that I should implement my own _exit and kill functions, so I added this codes to my project:

void _exit(int code)
{
    while(1);

}

int _DEFUN (kill, (pid, sig), int pid _AND int sig)
{
    if(pid == __MYPID)
        _exit(sig);

    return 0;
}

通过添加这两种功能，未定义的参考`_exit的错误是固定的，但未定义的参考``杀的错误依然存在。

By adding these two functions, the undefined reference to `_exit' error is fixed, but the undefined reference to ``kill' error still exists.

我应该怎么做才能解决这个问题？

What should I do to fix this issue?

推荐答案

尝试包裹杀在的externC{...}功能。而且，为了清楚起见，我建议不要使用 _DEFUN 宏。

Try wrapping the kill function in extern "C" { … }. And, for clarity, I suggest not using the _DEFUN macro.

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