对“kill"的未定义引用 [英] Undefined reference to `kill'

问题描述

我用 C 语言开发了一个 ARM7 嵌入式系统的应用程序.现在我想用 C++ 编译和链接它，以便使用一些 C++ 特性.为此，我使用 mipsel-elf-g++ 而不是 mipsel-elf-gcc.我可以使用 mipsel-elf-g++ 成功编译我的代码，但是在链接步骤中我得到了错误:

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-elf/lib/libc.a(lib_a-abort.o):在函数<代码>```中止':/cygdrive/d/Files/cross/mips/newlib-1.15.0/newlib/libc/stdlib/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-elf/lib/libc.a(lib_a-signalr.o):在函数<代码>```_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 个退出状态

collect2: ld returned 1 exit status

我搜索了这个问题，发现我应该实现自己的_exit和kill函数，所以我将这段代码添加到我的项目中:

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;
}

通过添加这两个函数，修复了对 `_exit' 的未定义引用错误，但对 `kill' 错误的未定义引用仍然存在.

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

尝试将 kill 函数包装在 extern "C" { ... } 中.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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