"CMakeLists.txt" seems to be missing - c++

I was trying to build SFML in order to start developing 2d-games in c++. I put the source-code directory inside C: (the directory itself is called 'SFML'). while trying to generate .cbp files using CMake, I ran into an error:
"The source directory "C:/SFML" does not appear to contain CMakeLists.txt"
It seems like there is a missing file that CMake didn't create.
I am using Cmake 3.10.1, the installation file can be found in https://cmake.org/download/ under the title:"Windows win32-x86 Installer".
I tried to build SFML 2.4.2, using the generator of Codeblocks - MinGW makefiles. The version of codeblocks used is: codeblocks-16.01mingw-setup.exe, found in http://www.codeblocks.org/downloads/26
Did someone encounter the same problem before and knows how to overcome it? If not -
Is there an already-built, ready to use, libray of this version? (2.4.2)
If not.. do you know about a version of SFML that is usable in visual studio 2017?
And another question (That is the last one, I promise...) - maybe you can recommend me about another library for c++, that is usable to develop 2d-games?
edt:
note: I am completely new to all this building thing
the containments of SFML:
maybe it's the binary version?
lib contains some static libraries, bin contains some .dll s

You probably downloaded something wrong or potentially extracted the SFML source into a sub folder or something like that.
Since you've mentioned Visual Studio: SFML is 100% compatible with Visual Studio and you can build it from source any time without having to worry about dependencies (everything included in the repository).
The steps to compile are pretty easy. I'd recommend you install Git to clone the latest source from the SFML repository. In addition you'll need CMake, which you obviously got already.
Open a Command Prompt and change your directory to C:\SFML.
Clone the official repository using Git: git clone https://github.com/SFML/SFML.git source (note the trailing .)
Wait for the source to be checked out to the source sub directory.
Create a new directory called build: md build && cd build
Now invoke CMake, pointing to the source directory and also defining your install path: cmake -DCMAKE_INSTALL_PREFIX=C:/SFML ../source
Build and install a debug build of SFML: cmake --build . --target install --config debug
Build and install a release build of SFML: cmake --build . --target install --config release
Alternatively you can just open the generated Visual Studio solution and build the INSTALL project on your own.
(You shouldn't have to define a build tool or anything; CMake should notice Visual Studio being installed and pick it up automatically.)

I have experienced this using cmake version 3.10 when using the -S command line option. On cmake version 3.15.4 it behaves as expected - so if you update cmake then it might just work.
Note that the -S command line option was not supported before version 3.13:
https://cmake.org/cmake/help/v3.13/release/3.13.html#command-line
Normally cmake is called from a "build" subdirectory of a project root, the project root contains CMakelists.txt. So you would create a "build" directory, change to it, and submit "cmake ..". This would pull in CMakelists.txt from the project root, and use the "build" subdirectory that you are in as the build directory. We say "build", what it actually does is generate makefiles which can then used by the "native" build system (e.g. "make" or Visual Studio) to perform the actual compilation and linking. This arrangement is not always convenient, hence the introduction of the -S and -B command line options.

Related

Compiling and Linking to Visual Studio 2022 using OpenCV source code built as Win32 from CMake C++

I'm trying to use OpenCV with Dear ImGui in Visual Studio 2022. I'm new to C/C++ libraries and building in general, so I'm unsure if I'm doing anything right. ImGui uses 32-bit architecture and I've used Cmake gui to compile the source code as Win32. I think I have the compiled source code, but it seems to be different than downloading the pre-built libraries. File Explorer Screenshot. I've added the bin to PATH environmental variable, and in Visual Studio tried adding \include to Include Directories, \lib or \lib\Debug to Library Directories, and opencv_world460d.lib to Additional Dependencies. The program still runs, but it doesn't seem to include anything related to OpenCV in the #include files. I found a few .dll files in bin\Debug, but I'm not sure if I should bother with that. I think I could move the source code into the project, but I'm fairly certain that isn't the proper way to do it. Any help would be appreciated.
I needed to run the install target:
You may have built the project, but probably you didn't run the install target. Try running cmake --build <build_dir> --config Release and then cmake --install <build_dir> --config Release, where <build_dir> is a placeholder for the path to the build dir shown in the screenshot. The latter command probably requires admin privileges. Probably best to check the docs of the lib, if there's a step by step instruction for building & installing the whole thing. –
fabian

Compile GLEW with CMake and Visual Studio 2019?

I tried to compile (build) GLEW source code with CMake and Visual Studio 2019 for get binaries. In directory (disk) C:\ I created folder GL and inside it, placed unzipped glew-2.1.0. In C:\GL\, I created the folder build. Because I found the file "CMakeLists.txt" in 3 folders,
C:\GL\glew-2.1.0\build\conan\test_package
C:\GL\glew-2.1.0\build\cmake
C:\GL\glew-2.1.0\build\cmake\testbuild
I tested all 3 paths in "Browse Source..." text box in CMake. In "Browse Build..." text box I pasted C:/GL/build.
In all 3 tests CMake responded:
"CMake Error: The source
"C:/GL/glew-2.1.0/build/cmake/CMakeLists.txt"
does not match the source
"C:/GL/glew-2.1.0/build/cmake/testbuild/CMakeLists.txt"
used to generate cache. Re-run cmake with a different source directory."
that is "file CMakeLists.txt in 2nd path does not match file of same name in 3rd path".
If you change the top-level source directory on which CMake runs, you should first delete your CMake cache (File > Delete Cache in CMake GUI), and run CMake from scratch to avoid these errors.
Have you tried the CMake instructions on the GLEW Github here? Try running these commands from the command line:
> cd C:/GL/glew-2.1.0/build
> cmake ./cmake
Though this deviates from the typical out-of-source build CMake idiom, this is how GLEW intends the build system be created. So on your system:
Source directory: C:/GL/glew-2.1.0/build/cmake
Build directory: C:/GL/glew-2.1.0/build
Note, the GLEW build instructions warn about the use of CMake for building this repo:
The cmake build is mostly contributer maintained. Due to the multitude of use cases this is maintained on a best effort basis. Pull requests are welcome.
Thus, you may have better luck following the typical Windows build approaches recommended here.
According to Mr. squareskittles answer-comment to my comment to his answer, that I have tested successfully, correct answer is that the folder to accommodate binaries should be C:/GL/glew-2.1.0/build or any folder you have created in glew-2.1.0. It is peculiarity of glew though. With GLFW you can create accommodating binaries folder outside it. However according to Mr.squareskittles's edit in his answer which I have tested successfully, if you delete Cashe (in CMake GUI, click File > Delete Cashe) you can create accommodating binaries folder outside glew-2.1.0. Regards.

How to build a project generated by CMake for MinGW makefiles?

I'm trying to build SFML's source code after I've ran the directory through CMake and after CMake generated the makefiles. I have no idea how though.
This is how the directory where I've set CMake to dump it's generation to:
On Linux I use
cmake --build .
to build my project. It calls the according build command. It works with make and ninja. Probably it works on Windows with MinGW.
Remember that cmake doesn't come with a build system. It only calls the commands. You have to install the build system you want to use.

OpenCV made by Cmake does not contain any libaries

I am trying to setup OpenCV for Visual Studio 2015, x64, in windows.
I have followed this guide to get OpenCV up and running, however after the CMake Part, i am not sure if everything has gone well.
1- my build file does not contain any lib folder
2- i am confused as where should i set the environment variable for it
3- I assume in visual studio i have to set path for the libraries, but i
don't see any in my build
4- my include folder has a weird install file
pic1: here is a picture of my OpenCV file that cMake built
bin folder is empty
pic2:include folder contents
CMake does not build your library. It sets your build environment, such as designating the install directory for the OpenCV.
So you need to actually build your OpenCV library, then you'll have your include and lib files at the place you've designated as the install directory (cmake_install_prefix in the CMake option).
If you've done your CMake step successfully, you can build your OpenCV by building ALL_BUILD project in your Visual Studio project explorer, and building INSTALL project after that.

How do I use CMake?

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?
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 & 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)
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.
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).
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.
Cmake from Windows terminal:
mkdir build
cd build/
cmake ..
cmake --build . --config Release
./Release/main.exe
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.