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

before_install:
  - export KERNEL_URL_DETAILS=$(wget --quiet -O - ${KERNEL_URL}v${KVER}/ | grep -A8 'Build for amd64\|Test amd64')
  - export ALL_DEB=$(echo "$KERNEL_URL_DETAILS" |  grep -m1 'all.deb' | cut -d '"' -f 2)
  - export KVER_BUILD=$(echo $ALL_DEB | cut -d '_' -f 2 | rev | cut -c14- | rev)
  - wget ${KERNEL_URL}v${KVER}/$(echo "$KERNEL_URL_DETAILS" | grep -m1 'amd64.deb' | cut -d '"' -f 2)
  - wget ${KERNEL_URL}v${KVER}/$ALL_DEB
  - sudo dpkg -i *.deb

script:
  - make CC=$COMPILER KVER=$KVER_BUILD-generic
env:
  global:
    - KERNEL_URL=https://kernel.ubuntu.com/~kernel-ppa/mainline/

addons:
  apt:
    packages:
      #Force update to GCC-7.5 in order to compile Kernels >= 5.4.
      - gcc-7

cache:
  - ccache: true

jobs:
  include:
    - addons:
        apt:
          sources:
            - sourceline: "ppa:ubuntu-toolchain-r/test"
          packages:
            - gcc-9
      env: COMPILER=gcc-9 KVER=$(curl -s https://www.kernel.org/releases.json | grep 'mainline' -B1 | head -1 | cut -d'"' -f4)
    - addons:
        apt:
          packages:
            - gcc-8
      env: COMPILER=gcc-8 KVER=$(curl -s https://www.kernel.org/releases.json | grep 'mainline' -B1 | head -1 | cut -d'"' -f4)

    - env: COMPILER=gcc-7 KVER=$(curl -s https://www.kernel.org/releases.json | grep 'mainline' -B1 | head -1 | cut -d'"' -f4)
    - env: COMPILER=gcc-7 KVER=$(curl -s https://www.kernel.org/releases.json | grep -A1 'latest_stable' | tail -1 | cut -d'"' -f4)
 #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/
    - env: COMPILER=gcc-7 KVER=5.4.28
    - env: COMPILER=gcc-7 KVER=4.19.116
    - env: COMPILER=gcc-7 KVER=4.14.176
    - env: COMPILER=gcc-7 KVER=4.9.219
    - env: COMPILER=gcc-7 KVER=4.4.219

#Version 4.15.x requested to test Ubuntu 18.04 LTS version
#TODO identify 4.15.x version dynamically instead of hardcode it.
    - addons:
        apt:
          packages:
            - linux-headers-4.15.0-20-generic
#Use the kernel headers from apt instead of download it from an external source
      before_install: true
      env: COMPILER=gcc-7 $KVER_BUILD=4.15.0-20