Detailed explanation of several ways to install CMake on Ubuntu

apt install CMake

sudo apt install cmake

This method is easy to install, but the disadvantage is that if you want to cross-compile opencv for the Android platform yourself, you will be prompted that the version is too low, because the cmake version in the ubuntu16.04 source is only 3.5.1, and the Android cross-compilation toolchain android.toolchain.cmake requires a minimum cmake version of 3.6.0

Download source code and compile CMake

Go to the cmake official website to download the latest cmake

https://cmake.org/download/

After downloading, unzip it and then enter the directory and execute:

./bootstrap
make -j8
sudo make install

Verify version

cmake --version

cmake version 3.9.0

CMake suite maintained and supported by Kitware (kitware.com/cmake).

This method can install the latest version of cmake, but if you want to cross-compile a third-party library for the Android platform, there will be problems during compilation, because the cross-compilation toolchain android.toolchain.cmake provided in the Android Sdk does not support the latest version of cmake

Soft link CMake in Android Sdk

Soft link the cmake in Android Sdk to the /usr/local/bin directory

sudo ln -s /home/gavinandre/Android/Sdk/cmake/3.6.4111459/bin/cmake /usr/local/bin

Now there should be no problem using the android cross-compilation toolchain android.toolchain.cmake to compile some third-party libraries

Write a simple Cmake example

First we write a main.cpp file, a simple helloworld program

#include<iostream>
int main()
{
  std::cout<<"hello world!"<<std::endl;
  return 0;
}

Then write the CMakeLists.txt file

cmake_minimum_required(VERSION 2.8)
#Project nameproject(HELLOWORLD)
#Include the original program, that is, copy the source program in the given directory to the variable DIR_SRC
#Store the source files in the specified path in the specified variable aux_source_directory(./DIR_SRC)
#Generate program add_executable(helloworld ${DIR_SRC})

Compile

$ mkdir build
$ cd build
$cmake ..
$make
$ ./helloworld

Execution Result:

hello world!

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