camke安装项目，并且能够使用find_package找到。cmake install files and make it could be find with find_package.

零、前言

自己写了一个公开库，给自己的私有项目做支持，因此需要对公开的进行安装，然后私有的再调用。

一、参考

cmake 生成供find_package使用的自定义模块;

Creating Packages¶;

How to use CMake to find and link to a library using install-export and find_package?;

二、我生成的项目

项目地址：BluffeyTest / Ransac;
文件结构如下:

.
├── bin
│   ├── testRansac
│   └── testRansac.exe
├── CMakeLists.txt
├── lib
│   └── libRansac.a
├── Ransac.cpp
├── Ransac.h
├── README.md
├── struct2d
│   ├── Arc.hpp
│   ├── Circle.hpp
│   ├── CMakeLists.txt
│   ├── Ellipse.hpp
│   ├── EllipseNormal.hpp
│   ├── Line.hpp
│   ├── Point.hpp
│   ├── SegmentLine.hpp
│   └── Struct2d.hpp
├── struct3d
│   ├── CMakeLists.txt
│   ├── Struct3d.cpp
│   └── Struct3d.h
└── testRansac.cpp

CMakeLists.txt如下,里面都有解释：

cmake_minimum_required(VERSION 3.1)

set(CMAKE_CXX_FLAGS "-std=c++11")

project(Ransac VERSION 1.1.0)

if(NOT CMAKE_BUILD_TYPE)
  set(CMAKE_BUILD_TYPE Release)
endif()

# Add local path for finding packages, set the local version first
list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake_modules")

#
add_subdirectory(./struct2d)
add_subdirectory(./struct3d)

#
aux_source_directory(./struct2d STRUCT2D_SRC)
aux_source_directory(./struct3d STRUCT3D_SRC)

aux_source_directory(. RANSAC_SRCS)
aux_source_directory(. RANSAC_INCLUDE)
aux_source_directory(. RANSAC_LIB_SRCS)

#设置可执行文件的输出路径
set(EXECUTABLE_OUTPUT_PATH ../bin)

#设置库的输出路径
set(LIBRARY_OUTPUT_PATH ../lib)

#设置包的
#SET(CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake)
SET(CMAKE_PREFIX_PATH ${PROJECT_SOURCE_DIR}/cmake)

add_library(Ransac SHARED ${STRUCT2D_SRC} ${STRUCT3D_SRC} Ransac.cpp)
#add_library(Ransac SHARED ${STRUCT2D_SRC} ${STRUCT3D_SRC} Ransac.cpp)
#add_executable(testRansac testRansac.cpp Ransac.cpp Struct2d.cpp Struct3d.cpp)
add_executable(testRansac testRansac.cpp)
target_link_libraries(testRansac Ransac)

#设置这个库的输出名称为

set(Ransac_HEADER_FILES
  struct2d/Point.hpp
  #struct2d/Point2f.hpp
  #struct2d/Point2d.hpp
  struct2d/Line.hpp
  struct2d/SegmentLine.hpp
  struct2d/Circle.hpp
  struct2d/Arc.hpp
  struct2d/Ellipse.hpp
  struct2d/EllipseNormal.hpp
  struct2d/Struct2d.hpp
  struct3d/Struct3d.h
  Ransac.h
)

#message("include dir is:${CMAKE_INSTALL_INCLUDEDIR}")
message("include dir is:${CMAKE_PREFIX_PATH}")


# 设置被安装的源文件目录和目标目录，但是好像并不需要
target_include_directories(Ransac PUBLIC
    $
    $)

#设置被安装的公共头文件
set_target_properties(Ransac PROPERTIES PUBLIC_HEADER 
    "${Ransac_HEADER_FILES}")

#安装头文件、库文件
install(TARGETS Ransac 
        EXPORT ransac-targets
        LIBRARY DESTINATION lib#/Ransac
        ARCHIVE DESTINATION lib#/Ransac
        RUNTIME DESTINATION bin#/Ransac
        PUBLIC_HEADER DESTINATION include/Ransac
        )

#安装用于寻找头文件和库文件的cmake文件
#注意ransac-config.cmake的包名必须小写
install(EXPORT ransac-targets
    NAMESPACE Ransac::
    FILE ransac-config.cmake
    DESTINATION lib/cmake/Ransac)

#注意RansacConfig.cmake的包名必须小写
install(EXPORT ransac-targets
    NAMESPACE Ransac::
    FILE RansacConfig.cmake
    DESTINATION lib/cmake/Ransac)

特别要注意的是ransac-config.cmake这儿的包名要小写。

三、总结

.cmake文件名，带横杠的要全小写，不带横杠的要按驼峰法写。
所要安装的文件最好直接安装在lib文件夹下，而不要再建一层文件夹，容易找不到。