Cemu/BUILD.md

Build instructions

Windows

Prerequisites:

• A recent version of Visual Studio 2022 (recommended but not required) with the following additional components:
  • C++ CMake tools for Windows
  • Windows 10/11 SDK
• git

Instructions:

1. Run git clone --recursive https://github.com/cemu-project/Cemu
2. Launch Cemu/generate_vs_solution.bat.
   • If you installed VS to a custom location or use VS 2019, you may need to manually change the path inside the .bat file
3. Wait until it's done, then open Cemu/build/Cemu.sln in Visual Studio
4. Then build the solution and once finished you can run and debug it, or build it and check the /bin folder for the final Cemu.exe.

You can also skip steps 3-5 and open the root folder of the cloned repo directly in Visual Studio (as a folder) and use the built-in cmake support but be warned that cmake support in VS can be a bit finicky.

Linux

To compile Cemu, a recent enough compiler and STL with C++20 support is required! clang-12 or higher is what we recommend.

Installing dependencies

For Ubuntu and derivatives:

sudo apt install -y git cmake ninja-build nasm libgtk-3-dev libsecret-1-dev libgcrypt20-dev libsystemd-dev freeglut3-dev libpulse-dev
Additionally, for ubuntu 20.04 only:

• sudo apt install -y clang-12
• At step 3 while building, use
  cmake -S . -B build -DCMAKE_BUILD_TYPE=release -DCMAKE_C_COMPILER=/usr/bin/clang-12 -DCMAKE_CXX_COMPILER=/usr/bin/clang++-12 -G Ninja -DCMAKE_MAKE_PROGRAM=/usr/bin/ninja

For Arch and derivatives:

sudo pacman -S git cmake clang ninja nasm base-devel linux-headers gtk3 libsecret libgcrypt systemd freeglut zip libpulse

For Fedora and derivatives:

sudo dnf install git cmake clang ninja-build nasm kernel-headers gtk3-devel libsecret-devel libgcrypt-devel systemd-devel freeglut-devel perl-core zlib-devel cubeb-devel

Build Cemu using cmake

1. git clone --recursive https://github.com/cemu-project/Cemu
2. cd Cemu
3. cmake -S . -B build -DCMAKE_BUILD_TYPE=release -DCMAKE_C_COMPILER=/usr/bin/clang -DCMAKE_CXX_COMPILER=/usr/bin/clang++ -G Ninja
4. cmake --build build
5. You should now have a Cemu executable file in the /bin folder, which you can run using ./bin/Cemu.

Troubleshooting steps

• If step 3 gives you an error about not being able to find ninja, try appending -DCMAKE_MAKE_PROGRAM=/usr/bin/ninja to the command and running it again.
• If step 3 fails while compiling the boost-build dependency, it means you don't have a working/good standard library installation. Check the integrity of your system headers and making sure that C++ related packages are installed and intact.
• If step 3 gives a random error, read the [package-name-and-platform]-out.log and [package-name-and-platform]-err.log for the actual reason to see if you might be lacking the headers from a dependency.
• If step 3 is still failing or if you're not able to find the cause, please make an issue on our Github about it!
• If step 4 gives you an error that contains something like main.cpp.o: in function 'std::__cxx11::basic_string..., you likely are experiencing a clang-14 issue. This can only be fixed by either lowering the clang version or using GCC, see below.
• If step 4 gives you a different error, you could report it to this repo or try using GCC. Just make sure your standard library and compilers are updated since Cemu uses a lot of modern features!

Using GCC

While we use and test Cemu using clang, using GCC might work better with your distro (they should be fairly similar performance/issues wise and should only be considered if compilation is the issue).
You can use it by replacing the step 3 with the following: cmake -S . -B build -DCMAKE_BUILD_TYPE=release -DCMAKE_C_COMPILER=/usr/bin/gcc -DCMAKE_CXX_COMPILER=/usr/bin/g++ -G Ninja