为arm-linux-gnueabi-gcc交叉编译libcurl [英] Cross compile libcurl for arm-linux-gnueabi-gcc

问题描述

我一直在尝试从ubuntu eclipse交叉编译用于arm-linux-gnueabi-gcc ++的libcurl 7.35.0。
我已在GCC ++链接器中包含-lcurl optons。当我尝试使用下面的代码在G ++编译器中编译代码时，一切进展顺利，并且构建后没有错误。

I have been trying to cross compile libcurl 7.35.0 from ubuntu eclipse for arm-linux-gnueabi-gcc++. I have included -lcurl optons in GCC++ linker. when I am trying to compile the code in G++ compiler for the below code everything is going well and no error was there after building.

#include <iostream>
#include <curl/curl.h>
using namespace std;

int main()
{
     return
}

但是当我尝试使用arm-linux-gnueabi-gcc ++进行交叉编译但尝试构建时会产生编译错误：

But when I am trying to cross compile using arm-linux-gnueabi-gcc++ but trying to Build this produces compilation errors:

/ usr / include /curl/curlrules.h:143:41：错误：数组' curl_rule_01 '的大小为负
/usr/include/curl/curlrules.h:153:53：错误：大小数组' curl_rule_02 '的值为负

/usr/include/curl/curlrules.h:143:41: error: size of array ‘curl_rule_01’ is negative /usr/include/curl/curlrules.h:153:53: error: size of array ‘curl_rule_02’ is negative

请帮助我指导如何为ARM交叉编译libcurl。

Kindly help me to guide how to cross compile libcurl for ARM.

推荐答案

我还记得当初我不得不交叉编译curl的时候……那天！卷曲在做什么虽然很奇怪，但是却很聪明。

I remember back when I had to cross-compile curl... what a day! What curl is doing is fairly odd, but yet clever.

如果您看到那条线，就会看到以下内容：

if you look at that line you see this:

typedef char
  __curl_rule_01__
    [CurlchkszEQ(long, CURL_SIZEOF_LONG)];

如果您查看CurlchkszEQ，您将得到

and if you look at CurlchkszEQ, you get

#define CurlchkszEQ(t, s) sizeof(t) == s ? 1 : -1

因此，此例程强制 sizeof（long）= = CURL_SIZEOF_LONG ，如果不这样做，它将在该数组初始化程序中放置一个负数，并导致构建失败。

So this routine is enforcing that sizeof(long) == CURL_SIZEOF_LONG, if it does not, it will put a negative number in that array initializer and cause the build to fail.

， CURL_SIZEOF_LONG 在 curlbuild.h 中定义，并定义为 8 ...在x86_64机器上。也就是说，在 /usr/include/curl/curlbuild.h 中将其设置为 8 。不过，您并不关心x86_64！您正在为手臂编译... 32位体系结构，其中 sizeof（long）== 4 ，而不是 8 和 CURL_SIZEOF_LONG 被错误地设置为 8 ！因此，看来您的编译器正在使用系统级x86_64 curl头文件，该文件位于 / usr / include /...，而不是交叉编译器的头！ （例如，我的位于 / opt / cross / arm-unknown-linux-gnueabi / include /...中，但您的不是）。

Here's the deal, CURL_SIZEOF_LONG is defined in curlbuild.h, and it is defined to 8... on an x86_64 machine. That is, in /usr/include/curl/curlbuild.h it is set to 8. You don't care about x86_64 though! You're compiling for arm... a 32-bit architecture where sizeof(long) == 4, not 8 and CURL_SIZEOF_LONG is improperly set to 8! So it appears your compiler is picking up on the system wide, x86_64 curl header files at /usr/include/... rather than the headers for the cross compiler! (for example mine are in /opt/cross/arm-unknown-linux-gnueabi/include/..., but yours probably are not).

因此，在编译编译器时， sizeof（long）== 4！= CURL_SIZEOF_LONG 会崩溃。理论上，解决问题的方法很简单，只需在编译器中更改配置即可使用交叉编译器包含的内容。在Eclipse中，我不确定该怎么做，尽管我确信这是可能的。

So when compiling the compiler resovles that sizeof(long) == 4 != CURL_SIZEOF_LONG and properly crashes. The way to fix the problem is simple in theory, just change your configuration in your compiler to use the cross-compiler includes. In Eclipse, I am not sure how to do it, though I am sure it is possible.

您可能会发现，从终端创建curl会更容易，例如：

You might find it easier just to build curl from the terminal like so:

curl $ ./configure --host=arm-linux-gnueabi --prefix=/path/to/your/arm-linux-gnueabi/arm-linux-gnueabi
... configure stuff ...
curl $ make && make install

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