为macOS-x86_64构建，但尝试链接为macOS-arm64构建的文件 [英] building for macOS-x86_64 but attempting to link with file built for macOS-arm64

问题描述

我使用c ++和OpenCV编写了代码:

I wrote a code using c++ and OpenCV:

#include <iostream>
#include <time.h>
#include <opencv2/opencv.hpp>
#include <opencv2/highgui.hpp>

using namespace std;

int main()
{
    ...
    return 0;
}

然后我尝试在终端上运行我的代码并使用g ++进行构建:

then I trying to Running my code on the terminal and build using g++:

g++ $(pkg-config --cflags --libs opencv) -std=c++11  yourFile.cpp -o yourFileProgram

但我收到此错误:

...
ld: warning: ignoring file /opt/homebrew/Cellar/opencv/4.5.1_2/lib/libopencv_core.dylib, building for macOS-x86_64 but attempting to link with file built for macOS-arm64
ld: warning: ignoring file /opt/homebrew/Cellar/opencv/4.5.1_2/lib/libopencv_photo.dylib, building for macOS-x86_64 but attempting to link with file built for macOS-arm64
Undefined symbols for architecture x86_64:
  "cv::Mat::Mat()", referenced from:
      _main in cv_test-ff1014.o
  "cv::Mat::~Mat()", referenced from:
      _main in cv_test-ff1014.o
  "cv::Mat::operator=(cv::Mat&&)", referenced from:
      _main in cv_test-ff1014.o
  "cv::imread(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, int)", referenced from:
      _main in cv_test-ff1014.o
  "cv::imwrite(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, cv::_InputArray const&, std::__1::vector<int, std::__1::allocator<int> > const&)", referenced from:
      _main in cv_test-ff1014.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

推荐答案

我遇到了同样的问题，简而言之，就是苹果改用了 libc ++ 而不是 libstdc ++ .如果您要按照提及的方式进行编译(通过控制台g ++)，则的答案是这里.

I had the same problem, and the short answer is that Apple switched to using libc++ instead of libstdc++. If you want to compile it as you mention (via console g++) then the answer is here.

此外，您在标记中提到了 g ++ ，但请确保

Also, you have mention g++ in tag, but be sure that you understand that gcc is alias of clang, and for using g++ compiler you have to print g++-10.

在示例中提供的通过终端编译 OpenCV 和 g ++ 的方法是

Way to compile OpenCV whith g++ via terminal as you provide in the example is described here

在macOS上包含 OpenCV lib的最佳方法是通过自制的opencv lib安装，然后仅生成 CMakeLists.txt .可能的示例:

The best way to include OpenCV lib on macOS is to install via homebrew opencv lib, and just generate CMakeLists.txt. Possible example for it:

cmake_minimum_required(VERSION 3.17)
project(PROJECT_NAME)
find_package(OpenCV REQUIRED )
include_directories( ${OpenCV_INCLUDE_DIRS} )

set(CMAKE_CXX_STANDARD 17)

#set(CMAKE_CXX_COMPILER "/usr/local/bin/g++-10" CACHE STRING "C++ compiler" FORCE)
#set(CMAKE_C_COMPILER "/usr/local/bin/gcc-10" CACHE STRING "C compiler" FORCE)

add_executable(PROJECT_NAME main.cpp)
target_link_libraries(PROJECT_NAME ${OpenCV_LIBS} )

请注意，如果您将强制使用 g ++-10 (取消注释集结构)，则会出现

Note, that if you will force to use g++-10 (uncomment set structure) then there will be problem like described here.
I think there is no OpenCV update for arm, then just ignore the warning and try something like that.

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