cmake简明教程-半小时从入门到精通

参考文献：

入门首先：http://www.hahack.com/codes/cmake/#

官方教程译文：https://juejin.im/post/5a72775d6fb9a01cac187e96

简单操作语法：https://learnxinyminutes.com/docs/cmake/

官方cmake、ctest、cpack介绍：https://cmake.org/cmake/help/v3.11/

源码例程：https://gitee.com/qccz123456/learn_cmake，通过git log可查看具体每一步的步骤。

书籍：http://sewm.pku.edu.cn/src/paradise/reference/CMake%20Practice.pdf

/*
step1:
    cmake -DUSE_MYSQRT=ON -DCMAKE_INSTALL_PREFIX=/home/eagle/Desktop/cmake_learn/build/output ..
step2:
    make
step3:
    make test
step4:
    make install
step5:
    cpack -C xxxx

export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:./build/output/lib
*/

/*
LearnCmake
  |__CMakeLists.txt
  |__LearnCmake_config.h.in
  |__main.cpp
  |__License.txt
  |__README
  |__feature
       |__CMakeLists.txt
       |__mysqrt.h
       |__mysqrt.cpp
*/

[LearnCmake/CMakeLists.txt]
/*       
cmake_minimum_required (VERSION 2.6)
project (LearnCmake)

# the version number, like define, 三者的名称相同
set (LearnCmake_VERSION_MAJOR 1)
set (PROJECT_VERSION_MINOR 0)
set (CMAKE_VERSION_PATCH 0)

# Set the output folder where your program will be created
set (CMAKE_BINARY_DIR ${CMAKE_SOURCE_DIR}/bin)
set (EXECUTABLE_OUTPUT_PATH ${CMAKE_BINARY_DIR})
set (LIBRARY_OUTPUT_PATH ${CMAKE_BINARY_DIR})

# Debug/Release settings
set (CMAKE_BUILD_TYPE "Debug")
set (CMAKE_CXX_FLAGS_DEBUG "$ENV{CXXFLAGS} -O0 -Wall -g -ggdb")
set (CMAKE_CXX_FLAGS_RELEASE "$ENV{CXXFLAGS} -O3 -Wall")

message (STATUS "src dir = ${PROJECT_SOURCE_DIR}")
message (STATUS "bin dir = ${PROJECT_BINARY_DIR}")
#message (WARNING "This is Warning")   # continue processing 
#message (SEND_ERROR "This is error")  # continue processing, but skip generation
#message (FATAL_ERR