Question

我从OpenCV获得了precompiled opencv2.framework，并且我已将其添加到我的项目中。但是，尝试编译项目会产生如下错误：

Undefined symbols for architecture armv7:
  "std::__1::__vector_base_common<true>::__throw_length_error() const", referenced from:
      std::__1::vector<unsigned long, std::__1::allocator<unsigned long> >::__append(unsigned long) in opencv2(matrix.o)
      std::__1::vector<cv::Vec<int, 128>, std::__1::allocator<cv::Vec<int, 128> > >::__append(unsigned long) in opencv2(matrix.o)
      std::__1::vector<cv::Vec<int, 64>, std::__1::allocator<cv::Vec<int, 64> > >::__append(unsigned long) in opencv2(matrix.o)
      std::__1::vector<cv::Vec<int, 32>, std::__1::allocator<cv::Vec<int, 32> > >::__append(unsigned long) in opencv2(matrix.o)
      std::__1::vector<cv::Vec<int, 16>, std::__1::allocator<cv::Vec<int, 16> > >::__append(unsigned long) in opencv2(matrix.o)
      std::__1::vector<cv::Vec<int, 12>, std::__1::allocator<cv::Vec<int, 12> > >::__append(unsigned long) in opencv2(matrix.o)
      std::__1::vector<cv::Vec<int, 9>, std::__1::allocator<cv::Vec<int, 9> > >::__append(unsigned long) in opencv2(matrix.o)
      ...
  "std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::basic_string(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&)", referenced from:
      cv::Exception::Exception(int, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, int) in opencv2(system.o)
      cv::error(cv::Exception const&) in opencv2(system.o)
      _cvRegisterModule in opencv2(system.o)
  "std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::operator=(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&)", referenced from:
      cv::Exception::formatMessage() in opencv2(system.o)
  "_OBJC_CLASS_$_ALAssetsLibrary", referenced from:
      objc-class-ref in opencv2(cap_ios_video_camera.o)
  "std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::__init(char const*, unsigned long)", referenced from:
      cv::sum(cv::_InputArray const&) in opencv2(stat.o)
      cv::countNonZero(cv::_InputArray const&) in opencv2(stat.o)
      cv::mean(cv::_InputArray const&, cv::_InputArray const&) in opencv2(stat.o)
      cv::meanStdDev(cv::_InputArray const&, cv::_OutputArray const&, cv::_OutputArray const&, cv::_InputArray const&) in opencv2(stat.o)
      cv::minMaxIdx(cv::_InputArray const&, double*, double*, int*, int*, cv::_InputArray const&) in opencv2(stat.o)
      cv::minMaxLoc(cv::_InputArray const&, double*, double*, cv::Point_<int>*, cv::Point_<int>*, cv::_InputArray const&) in opencv2(stat.o)
      cv::norm(cv::_InputArray const&, int, cv::_InputArray const&) in opencv2(stat.o)
      ...
  "std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::~basic_string()", referenced from:
      cv::sum(cv::_InputArray const&) in opencv2(stat.o)
      cv::countNonZero(cv::_InputArray const&) in opencv2(stat.o)
      cv::mean(cv::_InputArray const&, cv::_InputArray const&) in opencv2(stat.o)
      cv::meanStdDev(cv::_InputArray const&, cv::_OutputArray const&, cv::_OutputArray const&, cv::_InputArray const&) in opencv2(stat.o)
      cv::minMaxIdx(cv::_InputArray const&, double*, double*, int*, int*, cv::_InputArray const&) in opencv2(stat.o)
      cv::minMaxLoc(cv::_InputArray const&, double*, double*, cv::Point_<int>*, cv::Point_<int>*, cv::_InputArray const&) in opencv2(stat.o)
      cv::norm(cv::_InputArray const&, int, cv::_InputArray const&) in opencv2(stat.o)
      ...
ld: symbol(s) not found for architecture armv7
clang: error: linker command failed with exit code 1 (use -v to see invocation)

我在构建设置中将仅构建活动架构设置为否，但它仍然会发生。我需要做些什么才能让OpenCV正常工作？我使用的是XCode 5，目标是iOS7。

我已经added -lstdc++ to linker flags and switch the C++ compiler to libstdc++, as-per this answer。

我也尝试过从源代码编译OpenCV，但会产生同样的错误。

无论我是否将iOS6或7作为部署目标，它都是一样的。

Answer 1

你应该检查两件事：

您正在尝试使用OpenCV的C ++部分，但Xcode / clang非常直观。如果您要链接的文件是.m，则会将其视为Objective-C。相反，我们希望通过将扩展名重命名为.mm或者在右侧栏中显示文件属性并为类型选择Objective-C++ Source来将其视为Objective-C ++文件。强>

ALAssetsLibrary在AssetsLibrary.framework中定义，请将其添加到您项目的 Link Binary With Libraries 步骤中。

OpenCV Framework：未找到架构armv7的符号

1 个答案: