未定义对memcpy_s的引用 [英] Undefined reference to memcpy_s

问题描述

我正在尝试修复对memcpy_s()错误的未定义引用.我已经在文件中包含了string.h，并且memcpy()函数可以正常工作，并且我还尝试了包含memory.h.我使用的是x64 Windows 7，并使用gcc 4.8.1进行编译.

I'm trying to fix an undefined reference to memcpy_s() error. I've included string.h in my file and the memcpy() function works okay, and I've also tried including memory.h. I'm on x64 Windows 7 and using gcc 4.8.1 to compile.

#include <stdlib.h>
#include <stdio.h>
#include <string.h>

void doMemCopy(char* buf, size_t buf_size, char* in, int chr) {
    memcpy_s(buf, buf_size, in, chr);
}

的

内存已在调用doMemCpy(buf, 64, in, bytes)的主函数中分配. in是从标准输入中读取的字符串

memory for buf has been allocated in the main function, which calls doMemCpy(buf, 64, in, bytes). in is a string read from standard input

来自cmd终端的确切错误:

Exact error from cmd terminal:

对"memcpy_s" collect2.exe的未定义引用:错误:ld返回了1个退出状态

undefined reference to "memcpy_s" collect2.exe: error: ld returned 1 exit status

推荐答案

据我所知，GCC 4.8不包含函数memcpy_s或任何其他_s边界检查函数.这些功能在ISO 9899:2011附录K中定义，并且是可选的实现方式.使用它们之前，必须检查是否定义了__STDC_LIB_EXT1__.

GCC 4.8 does not include the function memcpy_s, or any of the other _s bounds checking functions as far as I can tell. These functions are defined in ISO 9899:2011 Annex K and they are optional to implement. Before using them you must check if __STDC_LIB_EXT1__ is defined.

这些功能最初是由Microsoft实现的，许多团体都反对将它们包含在标准中.我认为主要的反对意见是，由函数完成的错误处理涉及线程之间共享的全局回调句柄，但它们的效率也很低.

These functions were originally implemented by Microsoft and many parties objected to including them in the standard. I think the main objection is that the error handling that is done by the functions involves a global callback handle that is shared between threads, but they are also quite inefficient.

Carlos O'Donell和Martin Sebor在

Further reading is available from Carlos O'Donell and Martin Sebor in Updated Field Experience With Annex K — Bounds Checking Interfaces.

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