clion + caffe

使用一个开源cpp库，主要可以分为下面几个部分：
编写一个HelloWorld程序，基本使用库；调用库和阅读源代码不同的是，只需知道自己代码调用到那些依赖库，加进来即可，不需要库的源代码，它的重点在于通过报错时提示的少的函数引用名找到该函数所在的lib.
代开源代码工程，编译源代码，跑一跑DEMO；这是为了后面阅读/修改源代码做好准备，借助IDE我们可以获得”代码跳转“”和”实时修改编译，输出调试，在阅读时也能验证自己的理解“的功能

使用clion打开编译caffe源代码

使用clion打开$caffe_root目录
这时cmake会报错，说Dependencies.cmake会报找不到opencv相关的错

Error:By not providing "FindOpenCV.cmake" in CMAKE_MODULE_PATH this project has asked CMake to find a package configuration file provided by "OpenCV", but CMake did not find one.
Could not find a package configuration file provided by "OpenCV" with any of the following names:
  OpenCVConfig.cmake   opencv-config.cmake
Add the installation prefix of "OpenCV" to CMAKE_PREFIX_PATH or set "OpenCV_DIR" to a directory containing one of the above files.  If "OpenCV" provides a separate development package or SDK, be sure it has been installed.

按照它的建议修改，在caffe_root下搜索FindOpenCV.cmake，没有该文件；
在opencv（我这里的opencv是自己编译+pkgconfig的，不是apt-get安装的）中搜索opencv-config.cmake/OpenCVConfig.cmake，发现在 “/home/hui/ide/opencv/opencv-3.2.0/x64_bin/share/OpenCV” ，
即编译opencv生成的bin目录的内容，在/home/hui/ide/opencv/opencv-3.2.0/x64_makefile下也能找到，但是这个在opencv编译完成后一般删除掉了。
于是在Dependencies.camke的报错位置前设置OpenCV_DIR为该变量

Dependencies.cmake

# ---[ OpenCV
set(OpenCV_DIR "/home/hui/ide/opencv/opencv-3.2.0/x64_bin/share/OpenCV")
if(USE_OPENCV)
  find_package(OpenCV QUIET COMPONENTS core highgui imgproc imgcodecs)
  if(NOT OpenCV_FOUND) # if not OpenCV 3.x, then imgcodecs are not found
    find_package(OpenCV REQUIRED COMPONENTS core highgui imgproc)
  endif()
  list(APPEND Caffe_INCLUDE_DIRS PUBLIC ${OpenCV_INCLUDE_DIRS})
  list(APPEND Caffe_LINKER_LIBS PUBLIC ${OpenCV_LIBS})
  message(STATUS "OpenCV found (${OpenCV_CONFIG_PATH})")
  list(APPEND Caffe_DEFINITIONS PUBLIC -DUSE_OPENCV)
endif()

然后更新cmake (reload change)， build就可以了
3. build设置
setting->Build,Excution,Deploymeng->cmake:
CMake opetions中可以添加宏定义，如-D USE_OPENCV=True
build opetions, 可以添加make参数，比如-j 8(默认添加)
buid output path, 这个本来是用于设置编译生成文件的路径的，但显然这里他并不work。

使用clion打开编译caffe源代码

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