.travis.yml

language: c
compiler: gcc
dist: bionic
os: linux

before_install:
  #Cron builds only build mainline kernel. Stable and LTS kernels usually not have breaking changes.
  - if [ "$TRAVIS_EVENT_TYPE" == "cron" ] && [ "$KVER_BUILD" != "$KERNEL_MAINLINE" ]; then exit 0; fi
  - export KERNEL_URL_DETAILS=$(wget --quiet -O - ${KERNEL_URL}v${KVER_BUILD}/ | grep -A8 "Build for ${TRAVIS_CPU_ARCH}\|Test ${TRAVIS_CPU_ARCH}")
  - export ALL_DEB=$(echo "$KERNEL_URL_DETAILS" |  grep -m1 'all.deb' | cut -d '"' -f 2)
  - export KVER=$(echo $ALL_DEB | cut -d '_' -f 2 | rev | cut -c14- | rev)-generic
  - wget ${KERNEL_URL}v${KVER_BUILD}/$(echo "$KERNEL_URL_DETAILS" | grep -m1 "${TRAVIS_CPU_ARCH}.deb" | cut -d '"' -f 2)
  - wget ${KERNEL_URL}v${KVER_BUILD}/$ALL_DEB
  - sudo dpkg -i *.deb

script: make CC=$CC KVER=$KVER

addons:
  apt:
    packages:
      #Force update to GCC-7.5 in order to compile Kernels >= 5.4.
      - gcc-7
env:
  global:
    - KERNEL_URL=https://kernel.ubuntu.com/~kernel-ppa/mainline/
    - KERNEL_MAINLINE=$(curl -s https://www.kernel.org/releases.json | grep -B1 'mainline' | head -1 | cut -d'"' -f4)
    - KERNEL_STABLE=$(curl -s https://www.kernel.org/releases.json | grep -A1 'latest_stable' | tail -1 | cut -d'"' -f4)
  jobs:
    - KVER_BUILD=$KERNEL_MAINLINE
    - KVER_BUILD=$KERNEL_STABLE
    - KVER_BUILD=5.5.19 #EOL
 #Kernels 5.4 with minor versions > 28 are failing on amd64. Not upgrade the minor version without check https://kernel.ubuntu.com/~kernel-ppa/mainline/ 
    - KVER_BUILD=5.4.28
    - KVER_BUILD=4.19.131
    - KVER_BUILD=4.14.187
    - KVER_BUILD=4.9.229
    - KVER_BUILD=4.4.229
    - KVER_BUILD=3.16.84
cache:
  - ccache: true

jobs:
#Mainline kernel is also compiled on GCC 8, 9 and 10. Jobs are added to the build matrix expansion
  include:
    - addons:
        apt:
          sources:
            - sourceline: "ppa:ubuntu-toolchain-r/test"
          packages:
            - gcc-10
      env: CC=gcc-10 KVER_BUILD=$KERNEL_MAINLINE
    - addons:
        apt:
          sources:
            - sourceline: "ppa:ubuntu-toolchain-r/test"
          packages:
            - gcc-9
      env: CC=gcc-9 KVER_BUILD=$KERNEL_MAINLINE
    - addons:
        apt:
          packages:
            - gcc-8
      env: CC=gcc-8 KVER_BUILD=$KERNEL_MAINLINE