CI: build changes in tools/ on ubuntu/macos

This commits adds GitHub CI to check that all tools compile on both
Ubuntu and macOS. Since running in parrallel this should also detect
badly set depdendencies within tools/Makefile.

Signed-off-by: Paul Spooren <mail@aparcar.org>

.github/workflows/tools.yml

@@ -0,0 +1,129 @@
+name: Build host tools
+
+on:
+  pull_request:
+    paths:
+      - 'tools/**'
+
+jobs:
+  build:
+    name: Build tools on ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: False
+      matrix:
+        os: 
+          - ubuntu-latest
+          - macos-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+          path: openwrt
+
+      - name: Setup MacOS
+        if: ${{ matrix.os == 'macos-latest' }}
+        run: |
+          echo "WORKPATH=/Volumes/OpenWrt/openwrt/" >> "$GITHUB_ENV"
+          hdiutil create -size 20g -type SPARSE -fs "Case-sensitive HFS+" -volname OpenWrt OpenWrt.sparseimage
+          hdiutil attach OpenWrt.sparseimage
+          mv "$GITHUB_WORKSPACE/openwrt" /Volumes/OpenWrt/
+          cd "$WORKPATH"
+
+          brew install \
+            autoconf \
+            automake \
+            coreutils \
+            diffutils \
+            findutils \
+            gawk \
+            gettext \
+            git-extras \
+            gmp \
+            gnu-getopt \
+            gnu-sed \
+            gnu-tar \
+            grep \
+            libidn2 \
+            libunistring \
+            m4 \
+            make \
+            mpfr \
+            ncurses \
+            openssl@1.1 \
+            pcre \
+            pkg-config \
+            quilt \
+            readline \
+            wget \
+            zstd
+
+            echo "/bin" >> "$GITHUB_PATH"
+            echo "/sbin/Library/Apple/usr/bin" >> "$GITHUB_PATH"
+            echo "/usr/bin" >> "$GITHUB_PATH"
+            echo "/usr/local/bin" >> "$GITHUB_PATH"
+            echo "/usr/local/opt/coreutils/bin" >> "$GITHUB_PATH"
+            echo "/usr/local/opt/findutils/libexec/gnubin" >> "$GITHUB_PATH"
+            echo "/usr/local/opt/gettext/bin" >> "$GITHUB_PATH"
+            echo "/usr/local/opt/gnu-getopt/bin" >> "$GITHUB_PATH"
+            echo "/usr/local/opt/make/libexec/gnubin" >> "$GITHUB_PATH"
+            echo "/usr/local/opt/make/libexec/gnubin" >> "$GITHUB_PATH"
+            echo "/usr/sbin" >> "$GITHUB_PATH"
+            pwd
+
+      - name: Setup Ubuntu
+        if: ${{ matrix.os == 'ubuntu-latest' }}
+        env:
+          DEBIAN_FRONTEND: noninteractive
+        run: |
+          sudo apt-get update
+          sudo apt-get -y install \
+            build-essential \
+            ccache \
+            clang-12 \
+            ecj \
+            fastjar \
+            file \
+            g++ \
+            gawk \
+            gettext \
+            git \
+            java-propose-classpath \
+            libelf-dev \
+            libncurses-dev \
+            libssl-dev \
+            mkisofs \
+            python3 \
+            python3-dev \
+            python3-distutils \
+            python3-setuptools \
+            qemu-utils \
+            rsync \
+            subversion \
+            swig \
+            unzip \
+            wget \
+            xsltproc \
+            zlib1g-dev
+          echo "WORKPATH=$GITHUB_WORKSPACE/openwrt/" >> "$GITHUB_ENV"
+          cd "$WORKPATH"
+          pwd
+
+      - name: Make prereq
+        run: |
+          cd "$WORKPATH"
+          pwd
+          make defconfig
+
+      - name: Build tools
+        run: |
+          cd "$WORKPATH"
+          make tools/install -j$(nproc) BUILD_LOG=1
+
+      - name: Upload logs
+        if: failure()
+        uses: actions/upload-artifact@v2
+        with:
+          name: ${{ matrix.os }}-logs
+          path: "$WORKPATH/logs"