Magick ++链接错误 [英] Magick++ linking error

问题描述

我这里有一个使用Magick ++（ImageMagick接口）库的简单图像转换器代码。（Eclipse IDE）

I have here a simple image converter code using Magick++(ImageMagick interface) library.(Eclipse IDE)

#include <Magick++.h>
#include <string>
#include <iostream>

using namespace std;

using namespace Magick;

int main(int argc,char **argv) 
{ 
    Image image; 
    image.read("/home/usr1/test.tiff");
    image.write( "/home/usr1/test.bmp" ); 
    return 0;
}

我正在使用arm-linux目标进行交叉编译。代码编译成功，但在链接部分，我得到了未定义的引用错误。

I'am doing a cross compilation with arm-linux target. The code compiles successfully but on the linking part, I got undefined reference errors.

/usr/local/lib/libMagick++/libMagickCore.a(dlopen.o)(.text+0x144): In function `vm_open':
ltdl/loaders/dlopen.c:194: undefined reference to `dlopen'
/usr/local/lib/libMagick++/libMagickCore.a(dlopen.o)(.text+0x158):ltdl/loaders/dlopen.c:198: undefined reference to `dlerror'
/usr/local/lib/libMagick++/libMagickCore.a(dlopen.o)(.text+0x16c): In function `vm_close':
ltdl/loaders/dlopen.c:212: undefined reference to `dlclose'
/usr/local/lib/libMagick++/libMagickCore.a(dlopen.o)(.text+0x17c):ltdl/loaders/dlopen.c:214: undefined reference to `dlerror'
/usr/local/lib/libMagick++/libMagickCore.a(dlopen.o)(.text+0x198): In function `vm_sym':
ltdl/loaders/dlopen.c:227: undefined reference to `dlsym'
/usr/local/lib/libMagick++/libMagickCore.a(dlopen.o)(.text+0x1ac):ltdl/loaders/dlopen.c:231: undefined reference to `dlerror'

我使用以下命令编译代码：

I used the following command to compile the code:

/opt/Mx800SDK/vfitc/cross/bin/arm-linux-g++ -DMx870 -I/opt/Mx800SDK/vfitc/cross/arm-linux/include -I/usr/local/include/ImageMagick -I/opt/Mx800SDK/include -O2 -Wall -c -fmessage-length=0 -fno-strict-aliasing -o'main.o' '../main.cpp'

和链接：

/opt/Mx800SDK/vfitc/cross/bin/arm-linux-g++ -L/opt/Mx800SDK/lib -L/usr/local/lib/libMagick++ -o'imgConverter' ./main.o -lpthread -lMagick++ -lMagickWand -lMagickCore -ltiff -lz

还有其他吗？库我需要成功链接吗？我连接它吗？在此先感谢。

Is there any other library I need to link it successfully? Am I linking it right? Thanks in advance.

推荐答案

尝试反转Magick库，添加 MagickWand 库（并在最后放置libz和其他基本图像库，并在你使用时放置动态链接库）：

Try inverting the Magick libraries, add the MagickWand library (and put libz and other base image libraries at the end, and the dynamic linker library while you're at it):

... -lpthread -lMagick++ -lMagickWand -lMagickCore -lz -ldl

参见链接器订单 - GCC ，了解静态库的顺序为何如此重要。

See Linker Order - GCC for why the order of static libraries matters.

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