调用静态 opencv 库

Invoking static opencv library

本文关键字：opencv 静态 调用      更新时间：2023-10-16

我基于这篇文章构建了一个静态 opencv 库，之后我想为我的应用程序调用静态 opencv 库。但是，应用程序似乎无法链接静态opencv库，并且它给了我以下警告：

ld: warning: ignoring file /usr/local/lib/libopencv_core.a, file was built for archive which is not the architecture being linked (i386): /usr/local/lib/libopencv_core.a
ld: warning: ignoring file /usr/local/lib/libopencv_highgui.a, file was built for archive which is not the architecture being linked (i386): /usr/local/lib/libopencv_highgui.a
ld: warning: ignoring file /usr/local/lib/libopencv_imgproc.a, file was built for archive which is not the architecture being linked (i386): /usr/local/lib/libopencv_imgproc.a
ld: warning: ignoring file /usr/local/lib/liblibjasper.a, file was built for archive which is not the architecture being linked (i386): /usr/local/lib/liblibjasper.a
ld: warning: ignoring file /usr/local/lib/liblibjpeg.a, file was built for archive which is not the architecture being linked (i386): /usr/local/lib/liblibjpeg.a
ld: warning: ignoring file /usr/local/lib/liblibpng.a, file was built for archive which is not the architecture being linked (i386): /usr/local/lib/liblibpng.a
ld: warning: ignoring file /usr/local/lib/liblibtiff.a, file was built for archive which is not the architecture being linked (i386): /usr/local/lib/liblibtiff.a
ld: warning: ignoring file /usr/local/lib/libzlib.a, file was built for archive which is not the architecture being linked (i386): /usr/local/lib/libzlib.a
ld: warning: ignoring file /usr/local/lib/libIlmImf.a, file was built for archive which is not the architecture being linked (i386): /usr/local/lib/libIlmImf.a

在我看来，应用程序正在尝试调用动态 opencv 库，而仅调用cv::Mat测试的简单应用程序会给我以下错误： 

Undefined symbols for architecture i386:
  "cv::Mat::deallocate()", referenced from:
      cv::Mat::release() in main.o
  "cv::fastFree(void*)", referenced from:
      cv::Mat::~Mat() in main.o

编辑：正如答案所表明的那样，这不是链接问题，而是链接为不同架构构建的库的问题。除此之外，在构建和使用静态 OpenCV 库时，您应该注意的另外两件重要事情是：

  1. 确保它仅构建活动架构（是）。

  2. 此外，您应该链接opencv_highgui.a使用的framework Cocoa;general;-framework QTKit;general;-framework QuartzCore;general;-framework AppKit;。

这不是关于不成功的链接，而是关于不成功的构建。"文件是为存档而构建的，而不是正在链接的体系结构 （i386）"。您需要正确构建它，也就是说，为正确的体系结构构建它。

我相信通过

不向命令行传递任何选项cmake它确实为机器的本机架构构建了库（这是默认选项），大概是x86_64。但是，出于某种原因，您正在尝试在此处构建一个 32 位 i386 应用程序。因此，您的体系结构没有正确的静态库。

你可以通过构建 32 位 -Darch=i386 OpenCV 来解决它 cmake ），或者通过构建 64 位应用程序（原生架构或 x86_64，具体取决于您的构建系统）。

如果你觉得勇敢，你也可以构建 32 位和 64 位静态库，将它们组装成一个通用二进制文件，并链接到该通用库。

您应该使用以下方法构建本地应用程序：

cmake .. -DOpenCV_DIR=/path/to/opencv-3.0.0-beta/build/ -DCMAKE_OSX_ARCHITECTURES=x86_64

即。强制x86_64本地构建，这就是opencv版本。

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