如何使用 CMake 强制 c++ 编译器使用不同安装包的版本之一？

Question

我机器上安装的ROS Fuerte使用的是opencv 2.2。我想使用刚安装的 2.4.9 版本。它的位置是/home/polar/soft/lib/opencv/opencv-2.4.9/build/lib。

请问如何用 CMake 做到这一点？ 根据我的搜索，find_library 似乎可以解决问题，但无法使其正常工作。

===== 我在这样的 cpp 代码中包含了 opencv

  #include <opencv2/core/core.hpp>
    #include <opencv2/highgui/highgui.hpp>
    #include <opencv2/opencv.hpp>
    #include "opencv2/imgproc/imgproc.hpp"

===========这是我的 CMAKE

cmake_minimum_required(VERSION 2.8)
include($ENV{ROS_ROOT}/core/rosbuild/rosbuild.cmake)

rosbuild_init()
set(EXECUTABLE_OUTPUT_PATH ${PROJECT_SOURCE_DIR}/bin)
set(LIBRARY_OUTPUT_PATH ${PROJECT_SOURCE_DIR}/lib)

rosbuild_genmsg()
rosbuild_gensrv()


# GSL
find_package( PkgConfig REQUIRED)
pkg_check_modules( gsl REQUIRED gsl )

SET(corners_opencv_flag ok)

#*******************************************************************
#*******************************************************************

#******                CORNERS OPENCV

#*******************************************************************
#*******************************************************************
if(corners_opencv_flag)

  #---
  SET(execFiles_corner_opencv
    corner_v1

    )

  #---
  foreach(file_ros ${execFiles_corner_opencv})
    rosbuild_add_executable(${file_ros} computer-vision/corners/${file_ros}.cpp ) 
  endforeach(file_ros)

  #---
endif(corners_opencv_flag)


#-------------------
# STACK 
#--------------------

SET(FILES_TO_RUN
  ${execFiles_corner_opencv} 
  )


#=======================================================
#
#     CUSTOM LIBRARIES
#
#
#=======================================================
PROJECT(VOLCANO)
SET(SRC ${VOLCANO_SOURCE_DIR}/src)


#******* boost
find_package( Boost REQUIRED COMPONENTS program_options regex )
include_directories( ${Boost_INCLUDE_DIRS} )

if(Boost_FOUND)
  message("\n\n Boost found \n\n")
endif()

find_package(OpenCV REQUIRED PATHS /home/polar/soft/lib/opencv/opencv-2.4.9/cmake)


#===== Calculus
include_directories(${SRC}/calculus)
include_directories(${SRC}/calculus/matrix)
SET(MY_LIB
  ${MY_LIB}
 Calculus
 CholeskyDecompose
 )


#-------------------------------------------
# Linking the executables against the

#-------------------------------------------

foreach(file2link ${FILES_TO_RUN})

  target_link_libraries(${file2link} 
    ${MY_LIB} 
    ${MY_LIB} 
    ${gsl_LIBRARIES}
    ${Boost_PROGRAM_OPTIONS_LIBRARY} ${Boost_REGEX_LIBRARY}
    ${OpenCV_LIB}
   )

endforeach(file2link)  


#--- sources folders
ADD_SUBDIRECTORY(src)

Answer 1

将此添加到您的 CMakeLists.txt 中，替换之前的 find_package(OpenCV) 行：

find_package(OpenCV REQUIRED PATHS /home/polar/soft/lib/opencv/opencv-2.4.9/cmake)

你的opencv安装中应该有一个cmake目录。

Answer 2

所以，正如我所怀疑的，target_link_libraries(${file2link} .... ${OpenCV_LIB}) 是问题所在：OpenCV_LIB 似乎已分配。

现在，我正在以这种方式链接 opencv 并且它可以工作：

find_package(OpenCVV 2.4.9 PATHS /home/polar/soft/lib/opencv/opencv-2.4.9/cmake)
...
target_link_libraries(${file2link}  .... ${OpenCVV_LIB})

事实上我只是用了另一个名字，但OpenCV。

@texasflood，感谢您的帮助。

Answer 3

这里有很多混乱，没有正确的代码来巩固建议。

cmake_minimum_required(VERSION 3.1)

project( DisplayImage )

# Enable C++11
set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED TRUE)

# For OpenCV 4
SET(OpenCV_DIR <current-path>/Learning/opencv-installation/installation/OpenCV-master/lib/cmake/opencv4)

# For OpenCV 3
# SET(OpenCV_DIR "<current-path>/opencv3.4.8/installation/OpenCV-3.4.8/share/OpenCV/")

# If the package has been found, several variables will
# be set, you can find the full list with descriptions
# in the OpenCVConfig.cmake file.
# Print some message showing some of them
message(STATUS "OpenCV library status:")
message(STATUS "    version: ${OpenCV_VERSION}")
message(STATUS "    libraries: ${OpenCV_LIBS}")
message(STATUS "    include path: ${OpenCV_INCLUDE_DIRS}")

find_package( OpenCV REQUIRED )
include_directories( ${OpenCV_INCLUDE_DIRS} )
add_executable( DisplayImage main.cpp )
target_link_libraries( DisplayImage ${OpenCV_LIBS} )

谢谢。