main.yml

on: [ push, pull_request ]

permissions:
  contents: read

env:
  COMPILE_CFLAGS: -Werror
  PREPARE_CFLAGS:

jobs:
  compile:
    runs-on: ubuntu-20.04
    strategy:
      matrix:
        kernel: ["6.3", "5.15", "5.10", "5.4", "5.0", "4.19"]
        include:
          - kernel: "4.19"
            compile_cflags: -Wno-error=format-truncation -Wno-error=pointer-sign
          - kernel: "5.0"
            compile_cflags: -Wno-error=format-truncation -Wno-error=pointer-sign
          - kernel: "5.4"
            compile_cflags: -Wno-error=format-truncation -Wno-error=pointer-sign
          - kernel: "5.10"
            compile_cflags: -Wno-error=format-truncation -Wno-error=pointer-sign
          - kernel: "5.15"
            compile_cflags: -Wno-error=format-truncation -Wno-error=pointer-sign
          - kernel: "6.3"
            compile_cflags: -Wno-error=format-truncation -Wno-error=pointer-sign
            build_makeflags: KBUILD_MODPOST_WARN=1
    steps:
      - name: Install dependencies
        run: |
          sudo apt-get update
          sudo apt-get install gcc-9-plugin-dev libelf-dev
          gcc -print-file-name=plugin

      - name: Checkout the repo
        uses: actions/checkout@v4

      - name: Download and extract v${{ matrix.kernel }} kernel
        run: |
          KERNELVER=${{ matrix.kernel }}
          KERNELDIR=${HOME}/kernel
          KERNELROOT=${KERNELDIR}/linux-${KERNELVER}

          # Generate the "v{major}.x" URL path component from the kernel
          # version and then download and unpack the sources
          SERIES=v$(awk -vFS=. -vOFS=. '{$2="x"; print}' <<< ${KERNELVER})
          URL=https://cdn.kernel.org/pub/linux/kernel/${SERIES}/linux-${KERNELVER}.tar.xz
          mkdir -p ${KERNELDIR}
          rm -rf ${KERNELROOT}
          curl ${URL} | tar xJC ${KERNELDIR}

      - name: Prepare v${{ matrix.kernel }} kernel sources
        run: |
          KERNELVER=${{ matrix.kernel }}
          KERNELDIR=${HOME}/kernel
          KERNELROOT=${KERNELDIR}/linux-${KERNELVER}

          # Make sure the kernel can find a header for this compiler if necessary
          GCC_MAJOR_VER=$(gcc -dumpversion | cut -d'.' -f1)
          if [[ ! -f "${KERNELROOT}/include/linux/compiler-gcc${GCC_MAJOR_VER}.h" ]]; then
              COMPILER_H=$(ls -v ${KERNELROOT}/include/linux/compiler-gcc*.h | tail -n1)
              ln -s "${COMPILER_H}" "${KERNELROOT}/include/linux/compiler-gcc${GCC_MAJOR_VER}.h"
          fi

          # Fix issue preventing some late-version 4.x kenels from completing config
          if [[ "${KERNELVER}" == "4."* || "${KERNELVER}" == "5.1" ]]; then
              curl "https://github.com/torvalds/linux/commit/dfbd199a7cfe3e3cd8531e1353cdbd7175bfbc5e.patch" | patch -t -N -r - -p1 -d "${KERNELROOT}" || true
          fi

          make -C ${KERNELROOT} defconfig
          ${KERNELROOT}/scripts/config --file ${KERNELROOT}/.config --disable UNWINDER_ORC --enable UNWINDER_FRAME_POINTER
          make -C ${KERNELROOT} prepare modules_prepare EXTRA_CFLAGS="${PREPARE_CFLAGS} ${{ matrix.prepare_cflags }}"

      - name: Build input-wacom for v${{ matrix.kernel }} kernel
        run: |
          KERNELDIR=${HOME}/kernel
          KERNELROOT=${KERNELDIR}/linux-${{ matrix.kernel }}
          ./autogen.sh --with-kernel=${KERNELROOT}
          make V=1 EXTRA_CFLAGS="${COMPILE_CFLAGS} ${{ matrix.compile_cflags }}" EXTRA_MAKEFLAGS="${BUILD_MAKEFLAGS} ${{ matrix.build_makeflags }}"