ci: add GitHub actions for Linux and Windows builds

We build a "static" binary for Windows now to avoid distributing the
dependencies as DLLs.

.github/toolchains/x86_64-w64-mingw32.cmake

@@ -0,0 +1,22 @@
+set(TARGET x86_64-w64-mingw32)
+
+list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/.github/toolchains/${TARGET})
+
+set(CMAKE_SYSTEM_NAME Windows)
+set(CMAKE_SYSROOT /usr/${TARGET})
+
+set(CMAKE_C_COMPILER ${TARGET}-gcc)
+set(CMAKE_CXX_COMPILER ${TARGET}-g++)
+
+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+
+set(ENV{PKG_CONFIG_LIBDIR} ${CMAKE_SYSROOT}/lib/pkgconfig:${CMAKE_SYSROOT}/share/pkgconfig)
+set(ENV{PKG_CONFIG_PATH} $ENV{PKG_CONFIG_LIBDIR})
+
+set(CMAKE_BUILD_WITH_INSTALL_RPATH ON)
+
+set(CMAKE_EXE_LINKER_FLAGS "-static")
+
+

.github/toolchains/x86_64-w64-mingw32/FindPkgConfig.cmake

@@ -0,0 +1,5 @@
+# Hack: The toolchain file is evaluated too early to set the library suffixes, so we use a wrapper
+# around FindPkgConfig set it right before we search for libraries.
+set(CMAKE_FIND_LIBRARY_SUFFIXES ".a")
+
+include(${CMAKE_ROOT}/Modules/FindPkgConfig.cmake)

.github/workflows/MinedMap.yml

@@ -0,0 +1,85 @@
+name: 'MinedMap'
+on: ['push', 'pull_request', 'workflow_dispatch']
+
+jobs:
+  build:
+    name: 'Build MinedMap (${{ matrix.host }})'
+    runs-on: 'ubuntu-20.04'
+    strategy:
+      fail-fast: false
+      matrix:
+        host:
+          - 'x86_64-linux-gnu'
+          - 'x86_64-w64-mingw32'
+        include:
+          - host: 'x86_64-linux-gnu'
+            label: 'x86_64-linux-gnu'
+            packages: ['g++', 'libpng-dev']
+            prefix: '/usr'
+            build_libpng: false
+          - host: 'x86_64-w64-mingw32'
+            label: 'Win64'
+            packages: ['g++-mingw-w64-x86-64', 'libz-mingw-w64-dev']
+            prefix: '/usr/x86_64-w64-mingw32'
+            build_libpng: true
+
+    env:
+      CMAKE_TOOLCHAIN_FILE: '${{ github.workspace }}/.github/toolchains/${{ matrix.host }}.cmake'
+
+    steps:
+      - name: 'Checkout'
+        uses: 'actions/checkout@v2'
+
+      - name: 'Get version'
+        id: 'tag'
+        run: |
+          set -o pipefail
+          git fetch --prune --unshallow
+          git describe --abbrev=7 --match='v*' | sed 's/^v/::set-output name=tag::/'
+
+      - name: 'Dependencies (apt)'
+        run: |
+          sudo apt-get -y update
+          sudo apt-get -y install ninja-build ${{ join(matrix.packages, ' ') }}
+          sudo apt-get -y clean
+
+      - name: 'Dependencies (libpng)'
+        if: '${{ matrix.build_libpng }}'
+        run: |
+          pkgver=1.6.37
+          pkghash=505e70834d35383537b6491e7ae8641f1a4bed1876dbfe361201fc80868d88ca
+
+          mkdir -p build/libpng
+          cd build/libpng
+          wget http://downloads.sourceforge.net/sourceforge/libpng/libpng-$pkgver.tar.xz
+          echo "$pkghash libpng-$pkgver.tar.xz" | sha256sum -c -
+          tar xf libpng-$pkgver.tar.xz
+          cd libpng-$pkgver
+          ./configure \
+            --prefix=${{ matrix.prefix }} \
+            --host=${{ matrix.host }} \
+            --disable-shared
+          make -j$(nproc)
+          sudo make install
+          sudo rm ${{ matrix.prefix }}/lib/libpng*.la
+
+      - name: 'Build'
+        uses: lukka/run-cmake@v10
+        with:
+          configurePreset: 'ninja'
+          buildPreset: 'ninja-release'
+
+      - name: 'Install'
+        run: |
+          export DESTDIR="$(pwd)/build/install"
+          ninja -C builds/ninja -f build-RelWithDebInfo.ninja install/strip
+
+          pkgdir='build/pkg/MinedMap-${{ steps.tag.outputs.tag }}-${{ matrix.label }}'
+          mkdir -p "$pkgdir"
+          cp "$DESTDIR/usr/local/bin"/* "$pkgdir"/
+
+      - name: 'Archive'
+        uses: 'actions/upload-artifact@v2'
+        with:
+          name: 'MinedMap-${{ steps.tag.outputs.tag }}-${{ matrix.label }}'
+          path: 'build/pkg'

CMakePresets.json

@@ -0,0 +1,39 @@
+{
+  "version": 3,
+  "cmakeMinimumRequired": {
+    "major": 3,
+    "minor": 7,
+    "patch": 0
+  },
+  "configurePresets": [
+    {
+      "name": "ninja",
+      "displayName": "Ninja",
+      "description": "Generate Ninja project files",
+      "binaryDir": "${sourceDir}/builds/${presetName}",
+      "generator": "Ninja Multi-Config",
+      "cacheVariables": {
+        "CMAKE_TOOLCHAIN_FILE": {
+          "type": "FILEPATH",
+          "value": "$env{CMAKE_TOOLCHAIN_FILE}"
+        }
+      }
+    }
+  ],
+  "buildPresets": [
+    {
+      "name": "ninja-debug",
+      "configurePreset": "ninja",
+      "displayName": "Build ninja-debug",
+      "description": "Build ninja Debug configuration",
+      "configuration": "Debug"
+    },
+    {
+      "name": "ninja-release",
+      "configurePreset": "ninja",
+      "displayName": "Build ninja-release",
+      "description": "Build ninja Release configuration",
+      "configuration": "RelWithDebInfo"
+    }
+  ]
+}