Make CMAKE_OSX_ARCHITECTURES a cache variable and update docs

Author: MartinHelmut

Diff for: CMakeLists.txt

@@ -1,6 +1,6 @@
 cmake_minimum_required(VERSION 3.22)
 
-include(cmake/UniversalAppleBuild.cmake)
+include(cmake/AppleBuild.cmake)
 
 project(
   BasicGuiProjectSetupOpenGL

Diff for: CMakePresets.json

@@ -25,7 +25,8 @@
       "generator": "Xcode",
       "binaryDir": "build/xcode-debug",
       "cacheVariables": {
-        "CMAKE_BUILD_TYPE": "Debug"
+        "CMAKE_BUILD_TYPE": "Debug",
+        "CMAKE_OSX_ARCHITECTURES": "x86_64;arm64"
       },
       "condition": {
         "type": "equals",
@@ -39,7 +40,8 @@
       "generator": "Xcode",
       "binaryDir": "build/xcode-release",
       "cacheVariables": {
-        "CMAKE_BUILD_TYPE": "Release"
+        "CMAKE_BUILD_TYPE": "Release",
+        "CMAKE_OSX_ARCHITECTURES": "x86_64;arm64"
       },
       "condition": {
         "type": "equals",

Diff for: cmake/UniversalAppleBuild.cmake renamed to cmake/AppleBuild.cmake

@@ -1,7 +1,8 @@
 # This file needs to be included before calling `project`.
 if (APPLE AND "${CMAKE_GENERATOR}" STREQUAL "Xcode")
-  # Generate universal executable for Apple hardware.
-  set(CMAKE_OSX_ARCHITECTURES "$(ARCHS_STANDARD)")
+  # Define apple architecture for Release builds, use default. For an explicit
+  # universal executable use `x86_64;arm64`.
+  set(CMAKE_OSX_ARCHITECTURES "$(ARCHS_STANDARD)" CACHE INTERNAL "OS X architecture")
 
   # Support older macOS versions.
   set(CMAKE_OSX_DEPLOYMENT_TARGET 10.15 CACHE STRING "Minimum OS X deployment version")

Diff for: docs/BuildAndExecution.md

@@ -89,7 +89,8 @@ Run on a built target, in this example **debug**:
 ```
 
 Though, even better is to use **Xcode as generator** to create app builds on macOS. Only difference in usage is running
-CMake with `-GXcode`. If `CMAKE_OSX_ARCHITECTURES` is not set, it will create universal binaries on M1/2 macs.
+CMake with `-GXcode` and setting the `CMAKE_OSX_ARCHITECTURES` variable, for example to `x86_64;arm64` for a universal
+binaries.
 
 To run a **debug** build created with Xcode:
 

Diff for: docs/CMakePresets.md

@@ -67,6 +67,9 @@ cpack --preset release
 
 ## Workflows
 
+> [!IMPORTANT]
+> Workflow presets are only available in CMake version 3.25 and up.
+
 To list all available workflows, some dependent on the current system:
 
 ```shell

Diff for: docs/Packaging.md

@@ -23,8 +23,8 @@ Packaging settings for the application executable are in `src/app/cmake/packagin
 The final application build for Apple devices should be built via the `Xcode` generator with CMake.
 
 ```shell
-cmake -GXcode -DCMAKE_BUILD_TYPE=Release -B build/xcode
-cmake --build build/xcode
+cmake -GXcode -DCMAKE_BUILD_TYPE=Release -DCMAKE_OSX_ARCHITECTURES="x86_64;arm64" -B build/xcode
+cmake --build build/xcode --config Release
 ```
 
 ### Windows
@@ -61,8 +61,8 @@ system**.
 Xcode should be used to create the release build for the application distributable.
 
 ```shell
-cmake -GXcode -DCMAKE_BUILD_TYPE=Release -B build/xcode
-cmake --build build/xcode
+cmake -GXcode -DCMAKE_BUILD_TYPE=Release -DCMAKE_OSX_ARCHITECTURES="x86_64;arm64" -B build/xcode
+cmake --build build/xcode --config Release
 cpack --config build/xcode/CPackConfig.cmake
 ```
 

Diff for: docs/QuickStart.md

@@ -4,6 +4,7 @@ Having all [requirements](README.md#requirements) set, here you can find how to
 
 ## Table of contents
 
+- [TL;DR](#tldr)
 - [Build](#build)
 - [Execute](#execute)
   - [macOS](#macos)
@@ -12,6 +13,24 @@ Having all [requirements](README.md#requirements) set, here you can find how to
 - [Distribution](#distribution)
 - [Tests](#tests)
 
+## TL;DR
+
+> [!IMPORTANT]
+> Workflow presets are only available in CMake version 3.25 and up.
+
+The quickest way possible to get an actual distributable from zero is using the available CMake workflows. For Linux and
+Windows:
+
+```shell
+cmake --workflow --preset dist
+```
+
+And for macOS with Xcode:
+
+```shell
+cmake --workflow --preset xcode-dist
+```
+
 ## Build
 
 Usually available build modes are `Debug`, `Release`, and `RelWithDebInfo`.
@@ -30,12 +49,14 @@ cmake -GNinja -DCMAKE_BUILD_TYPE=Release -B build/release
 cmake --build build/release
 ```
 
-On macOS Xcode should be used as generator via `-GXCode`. For example creating a release build with XCode.
+On macOS Xcode should be used as generator via `-GXcode`. For example creating a release build with XCode. It is also
+necessary to specify the Apple architecture via `CMAKE_OSX_ARCHITECTURES`, for example for a universal executable using
+the value `x86_64;arm64"`.
 
 ```shell
-# Using Xcode
-cmake -GXcode -DCMAKE_BUILD_TYPE=Release -B build/xcode
-cmake --build build/xcode
+# Using Xcode, create universal executable
+cmake -GXcode -DCMAKE_BUILD_TYPE=Release -DCMAKE_OSX_ARCHITECTURES="x86_64;arm64" -B build/xcode
+cmake --build build/xcode --config Release
 ```
 
 ## Execute