未定义参考posix_memalign使用的mingw32 [英] Undefined reference to posix_memalign using mingw32

问题描述

我使用Debian挤压，交叉编译的Windows使用的目标的mingw32。

I'm using Debian Squeeze, cross compiling for windows targets using mingw32.

有关Linux目标，我可以用posix_memalign分配对齐的存储空间。

For a Linux target, I can use posix_memalign to allocate aligned memory.

我似乎无法找到一个方法来得到这个窗户目标工作;我得到未定义的引用错误。我曾尝试几种不同的功能，但没有成功。

I can't seem to find a way to get this to work for windows targets; I get errors about undefined references. I have tried several alternative functions, to no avail.

举例code：

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

int main(void)
{
    char *foo;

    /* works on linux */
    posix_memalign(&foo, 1024, 1024);

    /* deprecated linux */
    memalign(1024, 1024);
    valloc(1024);

    /* should work on windows only */
    _aligned_malloc(1024, 1024);
}

示例输出，适用于Linux目标（预期）：

Example output for a Linux target (expected):

ben@debian6400:~/folder$ gcc --version
gcc (Debian 4.4.5-8) 4.4.5

ben@debian6400:~/folder$ gcc -std=c99 test.c
test.c: In function ‘main’:
test.c:11: warning: implicit declaration of function ‘posix_memalign’
test.c:18: warning: implicit declaration of function ‘_aligned_malloc’
/tmp/ccPwPLsW.o: In function `main':
test.c:(.text+0x55): undefined reference to `_aligned_malloc'
collect2: ld returned 1 exit status

示例输出，适用于Windows目标 - 注意，所有四个功能是不确定的。

Example output for a Windows target -- note that all four functions are undefined

ben@debian6400:~/folder$ i586-mingw32msvc-gcc --version
i586-mingw32msvc-gcc (GCC) 4.4.4

ben@debian6400:~/folder$ i586-mingw32msvc-gcc -std=c99 test.c
test.c: In function ‘main’:
test.c:14: warning: implicit declaration of function ‘posix_memalign’
test.c:17: warning: implicit declaration of function ‘memalign’
test.c:18: warning: implicit declaration of function ‘valloc’
test.c:21: warning: implicit declaration of function ‘_aligned_malloc’
/tmp/ccpH5Dsj.o:test.c:(.text+0x26): undefined reference to `_posix_memalign'
/tmp/ccpH5Dsj.o:test.c:(.text+0x3a): undefined reference to `_memalign'
/tmp/ccpH5Dsj.o:test.c:(.text+0x46): undefined reference to `_valloc'
/tmp/ccpH5Dsj.o:test.c:(.text+0x5a): undefined reference to `__aligned_malloc'
collect2: ld returned 1 exit status

任何想法？

推荐答案

您应该能够使用 _aligned_malloc 。其它功能可缺少的MinGW。

You should be able to use _aligned_malloc. Other functions can be missing in mingw.

• 更新您的MinGW。它应该在4.6.2工作。


• 尝试 __ mingw_aligned_malloc 代替。



• 包括在此为了您的标题：

• Update your mingw. It should work in 4.6.2.
• Try __mingw_aligned_malloc instead.

• Include your headers in this order:

#include <stdlib.h>
#include <intrin.h>
#include <malloc.h>
#include <windows.h>

_aligned_malloc / _aligned_free 只是一个简单的包装围绕的malloc / 免费。如果一切都失败了，你应该能够把它写自己。

_aligned_malloc/_aligned_free is just a simple wrapper around malloc/free. If everything else fails, you should be able to write it yourself.

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