How do I use CMake

Question

I am trying to use CMake in order to compile opencv   I am reading the tutorial but can t understand what is CMakeLists files and how is it connected to the gui of CMake   Also couldn t understand what are makefiles  are they the same is CMakeLists     And which file is it which I in the end open with visual-studio

User · Answer

Yes  cmake and make are different programs  cmake is  on Linux  a Makefile generator  and Makefile-s are the files driving the make utility   There are other Makefile generators  in particular configure and autoconf etc      And you can find other build automation programs  e g  ninja

User · Answer

Regarding CMake 3 13 3  platform Windows  and IDE Visual Studio 2017  I suggest this guide  In brief I suggest  1  Download cmake   unzip it   execute it  2  As example download GLFW   unzip it   create inside folder Build  3  In cmake Browse  Source    Browse  Build    Configure and Generate  4  In Visual Studio 2017 Build your Solution  5  Get the binaries  Regards

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I don t know about Windows  never used it   but on a Linux system you just have to create a build directory  in the top source directory   mkdir build-dir   go inside it  cd build-dir   then run cmake and point to the parent directory  cmake      and finally run make  make   Notice that make and cmake are different programs  cmake is a Makefile generator  and the make utility is governed by a Makefile textual file  See  cmake  amp  make wikipedia pages   NB  On Windows  cmake might operate so could need to be used differently  You ll need to read the documentation  like I did for Linux

User · Answer

Cmake from Windows terminal  mkdir build cd build  cmake    cmake --build   --config Release   Release main exe

User · Answer

CMake  Cross platform make  is a build system generator  It doesn t build your source  instead  generates what a build system needs  the build scripts  Doing so you don t need to write or maintain platform specific build files  CMake uses relatively high level CMake language which usually written in CMakeLists txt files  Your general workflow when consuming third party libraries usually boils down the following commands  cmake -S thelibrary -B build cmake --build build cmake --install build  The first line known as configuration step  this generates the build files on your system  -S ource  is the library source  and -B uild  folder  CMake falls back to generate build according to your system  it will be MSBuild on Windows  GNU Makefiles on Linux  You can specify the build using -G enerator  paramater  like  cmake -G Ninja -S libSource -B build  end of the this step  generates build scripts  like Makefile    sln files etc  on build directory  The second line invokes the actual build command  it s like invoking make on the build folder  The third line install the library  If you re on Windows  you can quickly open generated project by  cmake --open build  Now you can use the installed library on your project with configured by CMake  writing your own CMakeLists txt file  To do so  you ll need to create a your target and find the package you installed using find package command  which will export the library target names  and link them against your own target

User · Answer

CMake takes a CMakeList file  and outputs it to a platform-specific build format  e g  a Makefile  Visual Studio  etc   You run CMake on the CMakeList first   If you re on Visual Studio  you can then load the output project solution

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