zxxf18 / opencv341-mingw-build-x64 Goto Github PK

cmake error

'thread' in namespace 'std' does not name a type
出现了这个问题，请问有什么解决方法吗？

您好，我直接使用本项目提供的OpenCV，

我在C盘新建opencv文件夹，里面有两个文件夹：
1、mingw-build：就是clone本项目后，重新命名的；
2、sources：我从OpenCV官网下载opencv-3.4.1.zip，解压后重新命名的。

这样就跟您的所有配置都相同了（存放位置、文件夹名等），而CMakeLists.txt如下：

cmake_minimum_required(VERSION 3.15)
project(Jovi_Pong_v1_0_0)

set(CMAKE_CXX_STANDARD 14)

set(OpenCV_DIR "C:/opencv/mingw-build")

add_executable(Jovi_Pong_v1_0_0 main.cpp)

FIND_PACKAGE(OpenCV REQUIRED)
IF (OpenCV_FOUND)
    INCLUDE_DIRECTORIES(${OpenCV_INCLUDE_DIRS})
    TARGET_LINK_LIBRARIES(Jovi_Pong_v1_0_0 ${OpenCV_LIBS})
ELSE (OpenCV_FOUND)
    MESSAGE(FATAL_ERROR "OpenCV library not found")
ENDIF (OpenCV_FOUND)

接下来写最简单的测试程序：

#include <opencv2/core/core.hpp>

using namespace cv;

int main()
{
    Mat img;
    return 0;
}

报错信息如下：

CMakeFiles\Jovi_Pong_v1_0_0.dir/objects.a(main.cpp.obj): In function ZN2cv3MatD1Ev': C:/opencv/sources/modules/core/include/opencv2/core/mat.inl.hpp:704: undefined reference to cv::fastFree(void*)'
CMakeFiles\Jovi_Pong_v1_0_0.dir/objects.a(main.cpp.obj): In function ZN2cv3Mat7releaseEv': C:/opencv/sources/modules/core/include/opencv2/core/mat.inl.hpp:816: undefined reference to cv::Mat::deallocate()'
collect2.exe: error: ld returned 1 exit status
mingw32-make.exe[3]: *** [CMakeFiles\Jovi_Pong_v1_0_0.dir\build.make:151: Jovi_Pong_v1_0_0.exe] Error 1
mingw32-make.exe[2]: *** [CMakeFiles\Makefile2:75: CMakeFiles/Jovi_Pong_v1_0_0.dir/all] Error 2
mingw32-make.exe[1]: *** [CMakeFiles\Makefile2:82: CMakeFiles/Jovi_Pong_v1_0_0.dir/rule] Error 2
mingw32-make.exe: *** [Makefile:117: Jovi_Pong_v1_0_0] Error 2

请问是哪里出了问题呢？