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ADD_EXECUTABLE: Add an executable to the project using the specified source files.//合成可执行文件 
  ADD_EXECUTABLE(exename [WIN32] [MACOSX_BUNDLE] [EXCLUDE_FROM_ALL]
                 source1 source2 ... sourceN)
ADD_LIBRARY: Add a library to the project using the specified source files.//合成库文件
  ADD_LIBRARY(libname [SHARED | STATIC | MODULE] [EXCLUDE_FROM_ALL]
              source1 source2 ... sourceN)

LINK_DIRECTORIES: Specify directories in which to search for libraries.//为链接器添加搜索路径
  LINK_DIRECTORIES(directory1 directory2 ...)

INCLUDE_DIRECTORIES: Add include directories to the build.//添加include路径
  INCLUDE_DIRECTORIES([AFTER|BEFORE] [SYSTEM] dir1 dir2 ...)


TARGET_LINK_LIBRARIES: Link a target to given libraries.//将 库文件 链接到 目标
  TARGET_LINK_LIBRARIES(target library1
                        <debug | optimized> library2
                        ...)

ADD_SUBDIRECTORY: Add a subdirectory to the build.//添加含有CMakeLists.txt子目录
  ADD_SUBDIRECTORY(source_dir [binary_dir] 
                   [EXCLUDE_FROM_ALL])