Adds documentation on how to run the custom Eclipse on macOS

Author: maxkratz

README.md

@@ -41,6 +41,9 @@ Quick installation using curl and bash:
 **The latest release can be found [here](https://github.com/eMoflon/emoflon-ibex-eclipse-build/releases/latest).**
 Download an archive for the version you are looking for from the release page and extract it.
 
+> [!CAUTION]
+> The built Eclipse version for **macOS** needs further adjustments to execute correctly. Please follow the steps in the respective [documentation](./doc/how-to-run-eclipse-on-macos.md) if you are using macOS.
+
 ### Updating
 
 You can use the [update script](./emoflon-update.sh) to update your installation.

doc/eclipse-damaged.png

@@ -0,0 +1,64 @@
+# How to run a custom Eclipse on macOS
+
+(Apparantly, this was only tested on AMD64-based Macs = Intel Macs only!)
+
+
+## Problem
+
+If you just run a custom Eclipse without further configuration on modern macOS systems, you will propably get one of the following error messages:
+
+![](./eclipse-damaged.png)
+
+![](./eclipse-java-home-error.png)
+
+![](./eclipse-jdk-cli-error.png)
+
+
+## Solution
+
+The following steps are necessary to run a custom Eclipse on modern macOS systems.
+
+- Allow your Terminal the privileges to `Full Disk Access` and `Developer Tools` in the `Settings` app of macOS.
+    - `Settings` -> `Privacy & Security` -> `Full Disk Access` -> Add `Terminal` app and/or toggle its setting to `on`.
+    - `Settings` -> `Privacy & Security` -> `Developer Tools` -> Add `Terminal` app and/or toggle its setting to `on`.
+- Install the recommend JDK, e.g., [Eclipse Temurin JDK 17](https://adoptium.net/de/temurin/releases/?os=mac&arch=x64&package=jdk&version=17).
+- Download the custom Eclipse archive (e.g., from https://emoflon.org or GitHub).
+- Extract it with a double click.
+- Right click on `Eclipse.app` -> `Show Package Contents` -> Navigate into `Contents`.
+- Open `Info.plist` with a text editor of your choice (e.g., [VSCodium](https://vscodium.com/)).
+- Open a Terminal window and run `$ /usr/libexec/java_home`
+    - This should return you a single path to your default Java JDK installation, e.g., `/Library/Java/JavaVirtualMachines/temurin-17.jdk/Contents/Home`
+- Leave your Terminal window open and return to your text editor (showing the contents of `Info.plist`). Scroll down into the block below the line `<key>Eclipse</key>` and enter your Java JDK's path with this syntax: `<string>-vm</string><string>$YOUR_PATH/bin/java</string>`
+    - Example: `<string>-vm</string><string>/Library/Java/JavaVirtualMachines/temurin-17.jdk/Contents/Home/bin/java</string>`
+- Save the file, close your editor, and open your Terminal window again.
+- Navigate the Terminal window to your Eclipse folder using `cd $FOLDER_NAME`, e.g., `cd Downloads/eclipste`.
+    - Verify that your custom `Eclipse.app` is located in the currently selected folder via `ls`.
+- Sign the modified `Eclipse.app` with this command: `$ sudo codesign --force --deep --sign - ./Eclipse.app`
+    - When requested, type in the password of your user account and hit enter.
+- Run `$ xattr -d com.apple.quarantine ./Eclipse.app` within the Terminal.
+- As for the `Terminal` app, add the privileges for `Full Disk Access` and `Developer Tools` to your `Eclipse.app`.
+
+You can now start your custom `Eclipse.app` with a double click on it.
+If macOS asks if you really want to start the "broken" app, select `Run`.
+
+---
+
+## Currently known issues
+
+... besides the hustle to get Eclipse running.
+
+- Custom eMoflon settings will not be honored.
+    - The default *perspective* is not the *eMoflon perspective*.
+    - The default workspace encoding may not be *UTF8*.
+    - The default git clone path is not `${workspace_loc}/git` as required to run eMoflon.
+- There is no specific build for ARM64/Apple ARM-based macOS systems.
+
+---
+
+## References/Pointers to useful websites
+
+- https://stackoverflow.com/questions/70725347/the-application-eclipse-can-t-be-opened-macos-monterey/71740449#71740449
+- https://www.eclipse.org/forums/index.php/t/1106695/
+- https://forums.developer.apple.com/forums/thread/684509
+- https://forums.developer.apple.com/forums/thread/673057
+- https://stackoverflow.com/questions/44872071/removing-the-code-signature-from-a-mac-app-executable