Add workflow for cross-building wxMSW on GitHub Actions

Use MinGW to build and Wine to run the GUI tests.

.github/workflows/ci.yml

@@ -6,6 +6,7 @@ on:
     branches:
       - master
     paths-ignore:
+      - '.github/workflows/ci_msw_cross.yml'
       - 'build/tools/appveyor*.bat'
       - 'build/tools/travis-ci.sh'
       - 'distrib/**'
@@ -22,6 +23,7 @@ on:
     branches:
       - master
     paths-ignore:
+      - '.github/workflows/ci_msw_cross.yml'
       - 'build/tools/appveyor*.bat'
       - 'build/tools/travis-ci.sh'
       - 'distrib/**'

.github/workflows/ci_msw_cross.yml

@@ -0,0 +1,193 @@
+# CI workflow cross-building wxMSW under Linux.
+name: wxMSW cross-build
+
+on:
+  push:
+    branches:
+      - master
+    paths-ignore:
+      - '.github/workflows/ci.yml'
+      - 'build/tools/appveyor*.bat'
+      - 'build/tools/travis-ci.sh'
+      - 'distrib/**'
+      - 'docs/**'
+      - 'interface/**'
+      - 'include/msvc/**'
+      - 'include/wx/gtk/**'
+      - 'include/wx/osx/**'
+      - 'locale/**'
+      - 'src/msw/**'
+      - 'src/osx/**'
+      - '*.md'
+      - '*.yml'
+      - 'wxwidgets.props'
+  pull_request:
+    branches:
+      - master
+    paths-ignore:
+      - '.github/workflows/ci.yml'
+      - 'build/tools/appveyor*.bat'
+      - 'build/tools/travis-ci.sh'
+      - 'distrib/**'
+      - 'docs/**'
+      - 'interface/**'
+      - 'include/msvc/**'
+      - 'include/wx/gtk/**'
+      - 'include/wx/osx/**'
+      - 'locale/**'
+      - 'src/msw/**'
+      - 'src/osx/**'
+      - '*.md'
+      - '*.yml'
+      - 'wxwidgets.props'
+
+jobs:
+  msw-cross-build:
+    # Set up this job to run in a Debian Sid container because it has recent
+    # versions of MinGW and Wine and is simpler to test with locally than the
+    # bespoke container used by GitHub Actions by default.
+    runs-on: ubuntu-latest
+    container: debian:sid-slim
+    name: ${{ matrix.name }}
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - name: wxMSW 64 bits
+          - name: wxMSW 32 bits
+            triplet: i686-w64-mingw32
+    env:
+      # Default to 64-bit build.
+      HOST_TRIPLET: ${{ matrix.triplet || 'x86_64-w64-mingw32' }}
+
+    # Run all commands as the normal user, created by the first step below.
+    #
+    # Note that the Bash options used here are the same as for the default
+    # shell used by GitHub Actions to minimize any surprises.
+    defaults:
+      run:
+        shell: /usr/bin/setpriv --reuid=runner --regid=adm --clear-groups --inh-caps=-all bash --noprofile --norc -eo pipefail {0}
+
+    steps:
+      - name: Set up container user
+        # Specify the default shell explicitly to override the default value above.
+        shell: bash
+        run: |
+          apt-get -q -o=Dpkg::Use-Pty=0 update
+          apt-get -qq install sudo
+
+          # Create a user with the same UID/GID and name as the existing user
+          # outside of the container and allow it using sudo without password.
+          useradd --home-dir $HOME --no-create-home --gid adm --uid 1001 runner
+
+          echo 'runner ALL=(ALL) NOPASSWD:ALL' > /etc/sudoers.d/runner
+
+      - name: Install prerequisites
+        run: |
+          export DEBIAN_FRONTEND=noninteractive
+
+          packages="git make wine x11-xserver-utils xvfb"
+
+          case "${HOST_TRIPLET}" in
+            x86_64-w64-mingw32)
+              packages="$packages g++-mingw-w64-x86-64 wine64"
+              ;;
+
+            i686-w64-mingw32)
+              sudo dpkg --add-architecture i386
+              sudo apt-get -q -o=Dpkg::Use-Pty=0 update
+              packages="$packages g++-mingw-w64-i686 wine32"
+              ;;
+
+            *)
+              echo "Unknown host triplet \"${HOST_TRIPLET}\"."
+              exit 1
+              ;;
+          esac
+
+          sudo apt-get -qq install $packages
+
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          submodules: 'recursive'
+
+      - name: Set environment variables
+        run: |
+          echo "WINEPATH=$(winepath --windows $(pwd)/lib)" >> $GITHUB_ENV
+
+          cpu_count=`nproc`
+          ((cpu_count++))
+          echo "wxMAKE_ARGS=-k -j$cpu_count" >> $GITHUB_ENV
+
+          echo "wxMAKEFILE_ERROR_CXXFLAGS=-Werror -Wno-error=cpp" >> $GITHUB_ENV
+
+      - name: Configure
+        run: |
+          ./configure --host=${HOST_TRIPLET} --disable-sys-libs --disable-optimise --disable-debug_info || rc=$?
+
+          if [ -n "$rc" ]; then
+            echo '*** Configuring failed, contents of config.log follows: ***'
+            echo '-----------------------------------------------------------'
+            cat config.log
+            echo '-----------------------------------------------------------'
+            exit $rc
+          fi
+
+      - name: Build
+        run: |
+          make $wxMAKE_ARGS "CXXFLAGS=$wxMAKEFILE_ERROR_CXXFLAGS"
+
+      - name: Build samples
+        run: |
+          make $wxMAKE_ARGS "CXXFLAGS=$wxMAKEFILE_ERROR_CXXFLAGS" samples
+
+      - name: Build tests
+        working-directory: tests
+        run: |
+          make $wxMAKE_ARGS failtest
+          make $wxMAKE_ARGS "CXXFLAGS=$wxMAKEFILE_ERROR_CXXFLAGS"
+
+      - name: Run non-GUI tests
+        working-directory: tests
+        run: |
+          . ../build/tools/httpbin.sh
+
+          httpbin_launch
+
+          wine ./test || rc=$?
+
+          if [ -n "$rc" ]; then
+            httpbin_show_log
+            exit $rc
+          fi
+
+      - name: Run GUI tests
+        working-directory: tests
+        run: |
+          echo 'Launching Xvfb...'
+          sudo mkdir /tmp/.X11-unix
+          sudo chmod 1777 /tmp/.X11-unix
+          Xvfb :10 -screen 0 1600x1200x24 &
+          num_tries=1
+          while true; do
+              if xset -d :10 -q >/dev/null 2>&1; then
+                  echo 'Xvfb has become available.'
+                  # Trying to use it immediately can still result in errors
+                  # when creating the windows, somehow, so give it some time
+                  # to settle.
+                  sleep 3
+                  break
+              fi
+
+              if [[ $num_tries -gt 10 ]]; then
+                  echo 'Timed out waiting for Xvfb'
+                  exit 1
+              fi
+
+              ((num_tries++))
+              echo "Still waiting for Xvfb (attempt #$num_tries)"
+              sleep 3
+          done
+          echo 'Launching the GUI test:'
+          DISPLAY=:10 wine ./test_gui