Generalize copilot setup steps and extend them for Mac and Windows

.github/instructions/GTK.instructions.md

@@ -7,4 +7,4 @@ applyTo: "bundles/org.eclipse.swt/Eclipse SWT PI/gtk/library/*.c,bundles/org.ecl
 - The GTK docs can be found here https://www.gtk.org/docs/
 - Be carefull between the difference of GTK3 and GTK4 we need to check for specific versions in some places already
 - The GTK3 > GTK4 migration guide can be found here https://docs.gtk.org/gtk4/migrating-3to4.html
-- You will find a shell script ./build_gtk.sh that must be used to compile the code for testing changes
+- Use the native build instructions in the AGENTS.md file to compile the code for testing changes

.github/workflows/copilot-setup-steps.yml

@@ -11,34 +11,35 @@ on:
 jobs:
     # The job MUST be called `copilot-setup-steps` or it will not be picked up by Copilot.
   copilot-setup-steps:
-    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        config: 
+          - { os: 'linux' , runner: ubuntu-latest  }
+          - { os: 'macosx', runner: macos-latest   }
+          - { os: 'win32' , runner: windows-latest }
+    runs-on: ${{ matrix.config.runner }}
     permissions:
       contents: read
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
         with:
           lfs: false
 
       - name: Set up JDK
-        uses: actions/setup-java@v5
+        uses: actions/setup-java@be666c2fcd27ec809703dec50e508c2fdc7f6654 # v5.2.0
         with:
           java-version: '21'
           distribution: 'temurin'
           cache: 'maven'
 
       - name: Set up Maven
-        uses: stCarolas/setup-maven@v5
+        uses: stCarolas/setup-maven@12eb41b233df95d49b0c11fc1b5bc8312e5d4ce0 # v5.1
         with:
           maven-version: '3.9.14'
       - name: Prepare Linux Build
+        if: ${{ matrix.config.os == 'linux' }}
         run: |
           sudo apt-get update -qq 
           sudo apt-get install -qq -y libgtk-3-dev libgtk-4-dev freeglut3-dev webkit2gtk-driver
-          mkdir -p /home/runner/build/gtk && mkdir -p /home/runner/build/tmp
-
-          echo "cd $GITHUB_WORKSPACE/bundles/org.eclipse.swt && java -Dws=gtk -Darch=x86_64 build-scripts/CollectSources.java -nativeSources '/home/runner/build/gtk'" >> $GITHUB_WORKSPACE/build_gtk.sh
-          echo "cd /home/runner/build/gtk && SWT_JAVA_HOME=${JAVA_HOME} MODEL=x86_64 OUTPUT_DIR=/home/runner/build/tmp ./build.sh install clean" >> $GITHUB_WORKSPACE/build_gtk.sh
-          echo "cd $GITHUB_WORKSPACE" >> $GITHUB_WORKSPACE/build_gtk.sh
-          chmod +x $GITHUB_WORKSPACE/build_gtk.sh
-

.github/workflows/maven.yml

@@ -128,6 +128,6 @@ jobs:
     with:
       runner: ${{ matrix.arch == 'x86_64' && 'macos-15-intel' || 'macos-latest' }}
       java: ${{ matrix.java }}
-      native: ${{ matrix.arch == 'x86_64' && 'cocoa.macosx.x86_64' || 'cocoa.macosx.aarch64' }}
+      native: cocoa.macosx.${{ matrix.arch }}
       performance: ${{ contains(github.event.pull_request.labels.*.name, 'performance') }}
       runtodotests: ${{ contains(github.event.pull_request.labels.*.name, 'runtodotests') }}

.gitignore

@@ -9,5 +9,3 @@ pom.tycho
 /xdg-runtime-*
 /binaries/org.eclipse.swt.*/src/
 tmpdir/
-# temp build script used by copilot instructions: https://github.com/eclipse-platform/eclipse.platform.swt/blob/c3318b8e7ebc9e34de80afc4f3e5ec15cc7ca112/.github/workflows/copilot-setup-steps.yml#L43
-/build_gtk.sh

AGENTS.md

@@ -35,33 +35,35 @@ SWT consists of two main parts:
 # Build the entire project
 mvn clean verify
 
-# Build specific platform binary
-mvn clean verify -Dnative=gtk.linux.x86_64
+# Build (and include) specific platform native binaries
+mvn clean verify -Dnative=${target.ws}.<os>.<arch>
 
 # Skip tests
 mvn clean verify -DskipTests
 ```
 
-### Building Natives
+### Building native binaries
 
-**GTK (Linux):**
-```bash
-cd bundles/org.eclipse.swt/Eclipse SWT PI/gtk/library
-./build.sh -gtk-all install    # Build both GTK3 and GTK4
-
-# Build only GTK3
-export GTK_VERSION=3.0
-./build.sh install
+In this section,
+the placeholder `<os>` has one of the values `macosx`, `linux` or `win32`,
+the placeholder `<ws>` has one of the values `cocoa` (for Mac), `gtk` (for Linux) or `win32` (for Windows),
+the placeholder `<arch>` has one of the values `x86_64`, `aarch64`, `ppc64le` or `riscv64`,
 
-# Build only GTK4
-export GTK_VERSION=4.0
-./build.sh install
+To build only the native binaries, run
+```
+cd binaries/org.eclipse.swt.<ws>.<os>.<arch>
+mvn clean antrun:run@build-native-binaries -Dnative=<ws>.<os>.<arch>
 ```
 
+For Linux, to build only the GTK3 binaries, set the environment variable `GTK_VERSION` to value `3.0`.
+Or to build only the GTK4, set the environment variable `GTK_VERSION` to `4.0`.
+
 **CRITICAL**: Files like `os.c`, `os_stats.c`, `os_stats.h` are **auto-generated**. Never edit them directly!
-Instead: modify Java source (e.g., `OS.java`), clean/rebuild the project, then run `./build.sh`.
+Instead: modify Java source (e.g., `OS.java`), clean/rebuild the project, then run the native build command above.
+
+**CRITICAL**: Never commit any built native binary files to git, i.e. files like `libswt-*.so`, `libswt-*.jnilib` or `swt-*.dll`.
 
-See `docs/gtk-dev-guide.md` for detailed instructions.
+See `docs/*.md` and `bundles/org.eclipse.swt/Readme*.md` files for detailed instructions.
 
 ## Coding Standards
 

docs/GTK4_DEPRECATION_STATUS.md

@@ -1,7 +1,7 @@
 # GTK4 Deprecation Status Report
 
 **Generated:** 2025-10-31 11:26:36 UTC
-**Build Command:** `./build_gtk.sh`
+**Build Command:** See the native build instructions in AGENTS.md
 
 ## Executive Summary
 
@@ -738,4 +738,4 @@ This is the largest and most complex migration.
 
 ---
 
-*This document was generated automatically by analyzing build output from `./build_gtk.sh` on 2025-10-31.*
+*This document was generated automatically on 2025-10-31.*