缺少手臂摹++的东西 [英] Missing something in arm g++

问题描述

我安装了codeSourcery G ++工具链，并试图编译一个简单的Hello World程序：

I installed the CodeSourcery g++ toolchain and tried to compile a simple hello world program:

#include <iostream>

using namespace std;

int main()
{
    cout << "Hello World" << endl;
    return 0;
}

和得到了很多错误链接器

And got a lot of errors from the linker

$ arm-none-eabi-g++ helloworld.cpp -o helloworld.exe
bin/ld: warning: cannot find entry symbol _start; defaulting to 0000000000008018
lib/libc.a(lib_a-abort.o): In function `abort':
abort.c:(.text.abort+0x10): undefined reference to `_exit'
lib/libc.a(lib_a-fstatr.o): In function `_fstat_r':
fstatr.c:(.text._fstat_r+0x1c): undefined reference to `_fstat'
lib/libc.a(lib_a-openr.o): In function `_open_r':
openr.c:(.text._open_r+0x20): undefined reference to `_open'
lib/libc.a(lib_a-sbrkr.o): In function `_sbrk_r':
sbrkr.c:(.text._sbrk_r+0x18): undefined reference to `_sbrk'
lib/libc.a(lib_a-signalr.o): In function `_kill_r':
signalr.c:(.text._kill_r+0x1c): undefined reference to `_kill'
lib/libc.a(lib_a-signalr.o): In function `_getpid_r':
signalr.c:(.text._getpid_r+0x4): undefined reference to `_getpid'
lib/libc.a(lib_a-writer.o): In function `_write_r':
writer.c:(.text._write_r+0x20): undefined reference to `_write'
lib/libc.a(lib_a-closer.o): In function `_close_r':
closer.c:(.text._close_r+0x18): undefined reference to `_close'
lib/libc.a(lib_a-isattyr.o): In function `_isatty_r':
isattyr.c:(.text._isatty_r+0x18): undefined reference to `_isatty'
lib/libc.a(lib_a-lseekr.o): In function `_lseek_r':
lseekr.c:(.text._lseek_r+0x20): undefined reference to `_lseek'
lib/libc.a(lib_a-readr.o): In function `_read_r':
readr.c:(.text._read_r+0x20): undefined reference to `_read'
collect2: ld returned 1 exit status

什么库我在这里丢失？

What library am I missing here?

推荐答案

海合会工具链只是你需要创建一个工作可执行*的一半。另一半是运行时库。运行时包括的crt0.o，其中包含入口点（code调用的main（）），一般一个包含标准C函数的libc（STRCMP（）的memcpy（），等），以及作为系统调用（开（），读（）等等）。你需要找到这些源。如果你的目标是嵌入式Linux或BSD的机器，你必须找出libc中你的目标是使用。这可能不是GNU libc的，BSD的libc，newlib，或uClibc的。你可以得到这些和自己构建它们，或者他们可能会提供已与您的操作系统。

The GCC toolchain is only half of what you need to create a working executable*. The other half is the runtime library. The runtime includes crt0.o, which contains the entry point (the code that calls main()), and generally a libc that contains the standard C functions (strcmp(), memcpy(), etc) as well as the system calls (open(), read(), and others). You need to find a source for these. If you're targeting an embedded Linux or BSD machine, you'll have to find out what libc your target is using. It's probably either GNU libc, BSD libc, newlib, or uclibc. You can get these and build them yourself, or they may be available already with your OS.

*除非你建立一个独立的二进制文件，但是这不看是你在做什么。

*unless you're building a freestanding binary, but this doesn't look to be what you're doing.

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