CI+build: Improve macOS builds (#1310)

BUILD.md

@@ -16,11 +16,11 @@
          - [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)
+   - [Installing Tool Dependencies](#installing-tool-dependencies)
+   - [Installing Library Dependencies](#installing-library-dependencies)
+   - [Build Cemu using CMake](#build-cemu-using-cmake)
+- [Updating Cemu and source code](#updating-cemu-and-source-code)
 
 ## Windows
 
@@ -141,31 +141,41 @@ If you are getting a different error than any of the errors listed above, you ma
 
 ## 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
+To compile Cemu, a recent enough compiler and STL with C++20 support is required! LLVM 13 and below
+don't support the C++20 feature set required, so either install LLVM from Homebrew or make sure that
+you have a recent enough version of Xcode. Xcode 15 is known to work. The OpenGL graphics API isn't
+supported on macOS, so Vulkan must be used through the Molten-VK compatibility layer.
 
 ### 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
+2. Set up the Homebrew shell environment:
+   1. **On an Intel Mac:** `eval "$(/usr/local/Homebrew/bin/brew shellenv)"`
+   2. **On an Apple Silicon Mac:** eval `"$(/opt/homebrew/bin/brew shellenv)"`
 
-### Installing Dependencies
+### Installing Tool Dependencies
 
-`brew install boost git cmake llvm ninja nasm molten-vk automake libtool`
+The native versions of these can be used regardless of what type of Mac you have.
+
+`brew install git cmake ninja nasm automake libtool`
+
+### Installing Library Dependencies
+
+**On Apple Silicon Macs, Rosetta 2 and the x86_64 version of Homebrew must be used to install these dependencies:**
+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
+3. `/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"`
+4. `eval "$(/usr/local/Homebrew/bin/brew shellenv)"`
+
+Then install the dependencies:
+
+`brew install boost molten-vk`
+
+### Build Cemu using CMake
 
-### 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`
+3. `cmake -S . -B build -DCMAKE_BUILD_TYPE=release -DCMAKE_OSX_ARCHITECTURES=x86_64 -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`.