编辑1：

Question

好的，我知道opencv链接之前已经讨论过，但是我看不到错误，我不理解纠正措施。我正在尝试链接DBoW2库，这需要opencv。我得到了未定义的引用错误。

$ mingw32-make
Linking CXX shared library ..\lib\libDBoW2.dll
CMakeFiles\DBoW2.dir/objects.a(FORB.cpp.obj):FORB.cpp:(.text+0x124): undefined reference to `cv::Mat::zeros(int, int, int)'
CMakeFiles\DBoW2.dir/objects.a(FORB.cpp.obj):FORB.cpp:(.text+0x1db): undefined reference to `cv::fastFree(void*)'
CMakeFiles\DBoW2.dir/objects.a(FORB.cpp.obj):FORB.cpp:(.text+0x394): undefined reference to `cv::Mat::deallocate()'
CMakeFiles\DBoW2.dir/objects.a(FORB.cpp.obj):FORB.cpp:(.text+0x46a): undefined reference to `cv::Mat::copyTo(cv::_OutputArray const&) const'
CMakeFiles\DBoW2.dir/objects.a(FORB.cpp.obj):FORB.cpp:(.text+0x503): undefined reference to `cv::Mat::copySize(cv::Mat const&)'
CMakeFiles\DBoW2.dir/objects.a(FORB.cpp.obj):FORB.cpp:(.text+0x93f): undefined reference to `cv::Mat::create(int, int const*, int)'
collect2.exe: error: ld returned 1 exit status

这是CMakeLists.txt文件

cmake_minimum_required(VERSION 2.8)
project(DBoW2)

set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS}  -Wall  -O3 -march=native ")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall  -O3 -march=native")

set(HDRS_DBOW2
  DBoW2/BowVector.h
  DBoW2/FORB.h 
  DBoW2/FClass.h       
  DBoW2/FeatureVector.h
  DBoW2/ScoringObject.h   
  DBoW2/TemplatedVocabulary.h)
set(SRCS_DBOW2
  DBoW2/BowVector.cpp
  DBoW2/FORB.cpp      
  DBoW2/FeatureVector.cpp
  DBoW2/ScoringObject.cpp)

set(HDRS_DUTILS
  DUtils/Random.h
  DUtils/Timestamp.h)
set(SRCS_DUTILS
  DUtils/Random.cpp
  DUtils/Timestamp.cpp)

find_package(OpenCV REQUIRED)

set(LIBRARY_OUTPUT_PATH ${PROJECT_SOURCE_DIR}/lib)

include_directories(${OpenCV_INCLUDE_DIRS})
add_library(DBoW2 SHARED ${SRCS_DBOW2} ${SRCS_DUTILS})
target_link_libraries(DBoW2 ${OpenCV_LIBS})

我正在使用gui接口，参数OpenCV_DIR自动设置为C：/ OpenCV / minwg_64。在该目录下有一个包含库文件的目录lib，如“libopencv_videostab300.dll.a”

CMakeCache.txt文件包含行

//Dependencies for the target
DBoW2_LIB_DEPENDS:STATIC=general;opencv_videostab;general;opencv_videoio;general;opencv_video;general;opencv_superres;general;opencv_stitching;general;opencv_shape;general;opencv_photo;general;opencv_objdetect;general;opencv_ml;general;opencv_imgproc;general;opencv_imgcodecs;general;opencv_highgui;general;opencv_hal;general;opencv_flann;general;opencv_features2d;general;opencv_core;general;opencv_calib3d;

根据我的阅读，以下几行应该足够了，但我收到链接器错误。

find_package(OpenCV REQUIRED)
include_directories(${OpenCV_INCLUDE_DIRS})
target_link_libraries(DBoW2 ${OpenCV_LIBS})

编辑1：

回应Chris Maes

添加了pkg检查

pkg_check_modules (OPENCV REQUIRED opencv)

现在配置导致错误，这是进展，但我仍然处于亏损状态。我必须在opencv安装/构建中出错。我在外部驱动器上有第二个副本，它是最近（并且很容易）使用像cmake这样的东西构建的。但是将OpenCV_DIR设置为外部构建会产生相同的错误。

Found PkgConfig: C:/msys64/usr/bin/pkg-config.exe (found version "0.28") 
checking for module 'opencv'
  package 'opencv' not found

编辑2：

以下是我开始新缓存并按两次生成时CMake自动生成的设置（第一次只生成make，sh）。

CMAKE_BUILD_TYPE (BLANK)
CMAKE_GNUtoMS (UNCHECKED)
CMAKE_INSTALL_PREFIX C:/Program Files (x86)/DBoW2
CMAKE_MAKE_PROGRAM C:/msys64/mingw64/bin/mingw32-make.exe
CMAKE_SH C:/msys64/usr/bin/sh.exe
OpenCV_DIR C:/OpenCV/minwg_64

目录C：/ OpenCV / minwg_64包含从mingw gcc 64构建的opencv库，以及包括OpenCVConfig.cmake和目录bin和lib的cmake文件。我想知道我是否需要目录staticlib？

对于Windows环境，我有

OPENCV_DIR = C:\OpenCV\minwg_64  (where built bin and lib are located)
OPENCV_VER = 300
PATH includes C:\OpenCV\minwg_64\bin

Answer 1

在 linux 上我使用pkg_check_modules插件进行cmake：

function yourFunction(str){

   if (window.XMLHttpRequest) {
                // code for IE7+, Firefox, Chrome, Opera, Safari
                xmlhttp = new XMLHttpRequest();
            } else {
                // code for IE6, IE5
                xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
            }
            xmlhttp.onreadystatechange = function() {
                if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
                    document.getElementById("txtHint").innerHTML = xmlhttp.responseText;
                }
            }
            xmlhttp.open("GET","yourPhp.php?q="+str,true);
            xmlhttp.send();
}

}

注意：我不记得为什么我使用了硬编码的find_package( OpenCV REQUIRED ) find_package( PkgConfig REQUIRED ) pkg_check_modules (OPENCV REQUIRED opencv) include_directories(/usr/include/opencv2) target_link_libraries(DBoW2 ${OPENCV_LDFLAGS})，但我想OPENCV_INCLUDE_DIRS在尝试时没有任何好处。可能有一种更干净的方式：）

如何更正CMAKE错误：找不到包'opencv'

编辑1：

编辑2：

1 个答案: