交叉编译libcurl用于arm-linux-gnueabi-gcc-Crosscompilelibcurlforarm-linux-gnueabi-gcc

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

我记得当我要交叉编译curl时……多糟糕的一天!curl正在做的事情相当奇怪，但却很聪明。

if you look at that line you see this:

如果你看这条线，你会看到:

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

and if you look at CurlchkszEQ, you get

如果你看CurlchkszEQ，你会得到

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

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.

这个例程执行sizeof(long) == CURL_SIZEOF_LONG，如果没有，它会在数组初始化器中输入一个负数，导致构建失败。

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).

这里的问题是，CURL_SIZEOF_LONG在curlbuild中定义。h，定义为8…在一个x86_64机器。也就是说,在/usr/include/curl/curlbuild.h它被设为8。但是你不关心x86_64 !你编译的手臂……一个32位的架构，其中sizeof(long) = 4，而不是8和CURL_SIZEOF_LONG被错误地设置为8!因此，您的编译器似乎正在系统范围内获取x86_64 curl头文件(/usr/ include/…)。而不是交叉编译器的头文件!(例如我的是in /opt/cross/arm-unknown-linux-gnueabi/include/…)，但你的可能不是)。

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.

因此，当编译器编译时，sizeof(long) == 4 != CURL_SIZEOF_LONG并正确地崩溃。解决这个问题的方法在理论上很简单，只需更改编译器中的配置以使用交叉编译器include。在Eclipse中，我不确定如何实现它，尽管我确信这是可能的。

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

你可能会发现从终端构建旋度更简单:

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