Cemu/BUILD.md

# Build Instructions

## Table of Contents

- [Windows](#windows)
- [Linux](#linux)
   - [Dependencies](#dependencies)
      - [For Arch and derivatives:](#for-arch-and-derivatives)
      - [For Fedora and derivatives:](#for-fedora-and-derivatives)
      - [For Ubuntu and derivatives](#for-ubuntu-and-derivatives)
   - [Build Cemu](#build-cemu)
      - [CMake and Clang](#cmake-and-clang)
      - [GCC](#gcc)
      - [Debug Build](#debug-build)
      - [Troubleshooting Steps](#troubleshooting-steps)
         - [Compiling Errors](#compiling-errors)
         - [Building Errors](#building-errors)
- [macOS](#macos)
   - [On Apple Silicon Macs, Rosetta 2 and the x86_64 version of Homebrew must be used](#on-apple-silicon-macs-rosetta-2-and-the-x86_64-version-of-homebrew-must-be-used)
   - [Installing brew](#installing-brew)
   - [Installing Dependencies](#installing-dependencies)
   - [Build Cemu using CMake and Clang](#build-cemu-using-cmake-and-clang)
   - [Updating Cemu and source code](#updating-cemu-and-source-code)

## Windows

Prerequisites:
- git
- A recent version of Visual Studio 2022 with the following additional components:
   - C++ CMake tools for Windows
   - Windows 10/11 SDK

Instructions for Visual Studio 2022:

1. Run `git clone --recursive https://github.com/cemu-project/Cemu`
2. Open the newly created Cemu directory in Visual Studio using the "Open a local folder" option
3. In the menu select Project -> Configure CMake. Wait until it is done, this may take a long time
4. You can now build, run and debug Cemu

Any other IDE should also work as long as it has CMake and MSVC support. CLion and Visual Studio Code have been confirmed to work.

## Linux

To compile Cemu, a recent enough compiler and STL with C++20 support is required! Clang-15 or higher is what we recommend.

### Dependencies

#### For Arch and derivatives:
`sudo pacman -S --needed base-devel clang cmake freeglut git glm gtk3 libgcrypt libpulse libsecret linux-headers llvm nasm ninja systemd unzip zip`

#### For Fedora and derivatives:
`sudo dnf install clang cmake cubeb-devel freeglut-devel git glm-devel gtk3-devel kernel-headers libgcrypt-devel libsecret-devel libtool libusb1-devel nasm ninja-build perl-core systemd-devel zlib-devel`

#### For Ubuntu and derivatives:
`sudo apt install -y cmake curl clang-15 freeglut3-dev git libgcrypt20-dev libglm-dev libgtk-3-dev libpulse-dev libsecret-1-dev libsystemd-dev libtool nasm ninja-build`

You may also need to install `libusb-1.0-0-dev` as a workaround for an issue with the vcpkg hidapi package.

At Step 3 in [Build Cemu using cmake and clang](#build-cemu-using-cmake-and-clang), use the following command instead:
   `cmake -S . -B build -DCMAKE_BUILD_TYPE=release -DCMAKE_C_COMPILER=/usr/bin/clang-15 -DCMAKE_CXX_COMPILER=/usr/bin/clang++-15 -G Ninja -DCMAKE_MAKE_PROGRAM=/usr/bin/ninja`

### Build Cemu

#### CMake and Clang

```
git clone --recursive https://github.com/cemu-project/Cemu
cd Cemu
cmake -S . -B build -DCMAKE_BUILD_TYPE=release -DCMAKE_C_COMPILER=/usr/bin/clang -DCMAKE_CXX_COMPILER=/usr/bin/clang++ -G Ninja
cmake --build build
```

#### GCC

If you are building using GCC, make sure you have g++ installed:
- Installation for Arch and derivatives: `sudo pacman -S gcc`
- Installation for Fedora and derivatives: `sudo dnf install gcc-c++`
- Installation for Ubuntu and derivatives: `sudo apt install g++`

```
git clone --recursive https://github.com/cemu-project/Cemu
cd Cemu
cmake -S . -B build -DCMAKE_BUILD_TYPE=release -DCMAKE_C_COMPILER=/usr/bin/gcc -DCMAKE_CXX_COMPILER=/usr/bin/g++ -G Ninja
cmake --build build
```

#### Debug Build

```
git clone --recursive https://github.com/cemu-project/Cemu
cd Cemu
cmake -S . -B build -DCMAKE_BUILD_TYPE=debug -DCMAKE_C_COMPILER=/usr/bin/clang -DCMAKE_CXX_COMPILER=/usr/bin/clang++ -G Ninja
cmake --build build
```

If you are using GCC, replace `cmake -S . -B build -DCMAKE_BUILD_TYPE=debug -DCMAKE_C_COMPILER=/usr/bin/clang -DCMAKE_CXX_COMPILER=/usr/bin/clang++ -G Ninja` with `cmake -S . -B build -DCMAKE_BUILD_TYPE=debug -DCMAKE_C_COMPILER=/usr/bin/gcc -DCMAKE_CXX_COMPILER=/usr/bin/g++ -G Ninja`

#### Troubleshooting Steps

##### Compiling Errors

This section refers to running `cmake -S...` (truncated).

* `vcpkg install failed`
   * Run the following in the root directory and try running the command again (don't forget to change directories afterwards):
      * `cd dependencies/vcpkg && git fetch --unshallow`
* `Please ensure you're using the latest port files with git pull and vcpkg update.`
   * Either:
      * Update vcpkg by running by the following command:
         * `git submodule update --remote dependencies/vcpkg`
      * If you are sure vcpkg is up to date, check the following logs:
         * `Cemu/dependencies/vcpkg/buildtrees/wxwidgets/config-x64-linux-out.log`
         * `Cemu/dependencies/vcpkg/buildtrees/libsystemd/config-x64-linux-dbg-meson-log.txt.log`
         * `Cemu/dependencies/vcpkg/buildtrees/libsystemd/config-x64-linux-dbg-out.log`
* Not able to find Ninja.
   * Add the following and try running the command again:
      * `-DCMAKE_MAKE_PROGRAM=/usr/bin/ninja`
* Compiling failed during 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.
* Compiling failed during rebuild after `git pull` with an error that mentions RPATH
   * Add the following and try running the command again:
      * `-DCMAKE_BUILD_WITH_INSTALL_RPATH=ON`
* If you are getting 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 you are getting a different error than any of the errors listed above, you may either open an issue in this repo or try using [GCC](#gcc). Make sure your standard library and compilers are updated since Cemu uses a lot of modern features!


##### Building Errors

This section refers to running `cmake --build build`. 

* `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 [GCC](#gcc).
* `fatal error: 'span' file not found`
   *  You're either missing `libstdc++` or are using a version that's too old. Install at least v10 with your package manager, eg `sudo apt install libstdc++-10-dev`. See [#644](https://github.com/cemu-project/Cemu/issues/644).
* `undefined libdecor_xx`
   * You are likely experiencing an issue with sdl2 package that comes with vcpkg. Delete sdl2 from vcpkg.json in source file and recompile.

If you are getting a different error than any of the errors listed above, you may either open an issue in this repo or try using [GCC](#gcc). Make sure your standard library and compilers are updated since Cemu uses a lot of modern features!

## macOS

To compile Cemu, a recent enough compiler and STL with C++20 support is required! LLVM 13 and
below, built in LLVM, and Xcode LLVM don't support the C++20 feature set required. The OpenGL graphics
API isn't support on macOS, Vulkan must be used. Additionally Vulkan must be used through the
Molten-VK compatibility layer

### On Apple Silicon Macs, Rosetta 2 and the x86_64 version of Homebrew must be used

You can skip this section if you have an Intel Mac. Every time you compile, you need to perform steps 2.

1. `softwareupdate --install-rosetta` # Install Rosetta 2 if you don't have it. This only has to be done once
2. `arch -x86_64 zsh` # run an x64 shell

### Installing brew

1. `/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"`
2. `eval "$(/usr/local/Homebrew/bin/brew shellenv)"` # set x86_64 brew env

### Installing Dependencies

`brew install boost git cmake llvm ninja nasm molten-vk automake libtool`

### Build Cemu using CMake and Clang
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/local/opt/llvm/bin/clang -DCMAKE_CXX_COMPILER=/usr/local/opt/llvm/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_release`.

#### Troubleshooting steps
- If step 3 gives you an error about not being able to find ninja, try appending `-DCMAKE_MAKE_PROGRAM=/usr/local/bin/ninja` to the command and running it again.

## Updating Cemu and source code
1. To update your Cemu local repository, use the command `git pull --recurse-submodules` (run this command on the Cemu root).
    - This should update your local copy of Cemu and all of its dependencies.
2. Then, you can rebuild Cemu using the steps listed above, according to whether you use Linux or Windows.

If CMake complains about Cemu already being compiled or another similar error, try deleting the `CMakeCache.txt` file inside the `build` folder and retry building.