使用CMake编译OpenCV项目时出错

Error compiling an OpenCV project with CMake

本文关键字:出错 项目 OpenCV CMake 编译 使用      更新时间:2023-10-16

我遵循本教程,试图创建一些OpenCV项目。它在Windows和Visual Studio中运行得很好,但后来我尝试使用以下CmakeLists.txt在我的Ubunto VM中运行它:

cmake_minimum_required(VERSION 2.8)
project( TrackObj )
find_package( OpenCV REQUIRED )
add_executable( TrackObj Source.cpp Fruit.cpp Fruit.h)
target_link_libraries( TrackObj ${OpenCV_LIBS} )

当我运行cmake .时,似乎一切都很好:

vm@vm-ubuntu:~/Desktop/TrackObj$ cmake .
-- The C compiler identification is GNU 4.8.2
-- The CXX compiler identification is GNU 4.8.2
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Configuring done
-- Generating done
-- Build files have been written to: /home/vm/Desktop/TrackObj

但是当我运行make时,我会得到以下错误:

vm@vm-ubuntu:~/Desktop/TrackObj$ make
Scanning dependencies of target TrackObj
[ 50%] Building CXX object CMakeFiles/TrackObj.dir/Source.cpp.o
In file included from /usr/include/c++/4.8/thread:35:0,
                 from /home/vm/Desktop/TrackObj/Source.cpp:10:
/usr/include/c++/4.8/bits/c++0x_warning.h:32:2: error: #error This file requires compiler and library support for the ISO C++ 2011 standard. This support is currently experimental, and must be enabled with the -std=c++11 or -std=gnu++11 compiler options.
 #error This file requires compiler and library support for the 
  ^
make[2]: *** [CMakeFiles/TrackObj.dir/Source.cpp.o] Error 1
make[1]: *** [CMakeFiles/TrackObj.dir/all] Error 2
make: *** [all] Error 2

我对CMake很陌生,但我很确定问题出在我使用多个.cpp文件和使用CMake的方式上。原因是当我尝试在教程中运行预览步骤时,当项目只包括一个.cpp文件时,一切都很好

您可以在此处看到确实有效的源代码(进行了一些小的更改,如删除#include <opencvhighgui.h> #include <opencvcv.h>并改为编写:#include <opencv2/opencv.hpp>。而的源代码在这里也不起作用,只是做了同样的小改动。此外,该项目还包括视频中描述的非常简单的Fruit.cpp和Fruit.h。

我浏览了不太友好的CMake官方教程,以及更友好的johnlamp和OpenCV教程,但在这里找不到我做错了什么。

错误告诉您需要为编译器启用C++11功能。您可以通过设置编译器标志-std=c++11(对于旧版编译器则为-std=c++0x)来完成此操作。在CMake中,可以在CMAKE_C_FLAGS/CMAKE_CXX_FLAGS变量中定义编译器标志,具体取决于目标语言。

在您的情况下:

set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")