travis: add basic CI support

Signed-off-by: Roman Stratiienko <roman.stratiienko@globallogic.com>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>

.travis.yml

+language: c
+dist: xenial
+
+addons:
+  apt:
+    packages:
+      - gcc-aarch64-linux-gnu
+      - gcc-arm-linux-gnueabihf
+      - patch
+      - quilt
+      - wget
+
+env:
+  global:
+    - KDIR=/tmp/kernel
+
+install:
+  - if [[ "${KERNEL_VERSION}" == *-rc* ]]; then
+      KERNEL_URL=https://git.kernel.org/torvalds/t/linux-${KERNEL_VERSION}.tar.gz;
+    else
+      KERNEL_URL=https://www.kernel.org/pub/linux/kernel/v${KERNEL_VERSION::1}.x/linux-${KERNEL_VERSION}.tar.xz;
+    fi
+  - wget -O kernel.tar.xz ${KERNEL_URL} && mkdir ${KDIR} && tar -C ${KDIR} --strip=1 -xf kernel.tar.xz
+  - wget -O /tmp/ipipe.patch ${IPIPE_URL}
+
+before_script:
+  - case "${ARCH}" in
+      "arm64") export CROSS_COMPILE=aarch64-linux-gnu-
+          ;;
+      "arm"  ) export CROSS_COMPILE=arm-linux-gnueabihf-
+          ;;
+      "x86"  ) export CROSS_COMPILE=
+          ;;
+    esac
+  - pushd ${KDIR}
+  - make -j $(nproc) ${KERNEL_DEFCONFIG}
+  - ./scripts/config -e IPIPE
+  - ./scripts/config -e XENOMAI
+  - ./scripts/config -e XENO_DRIVERS_ANALOGY
+  - ./scripts/config -e XENO_DRIVERS_ANALOGY_DEBUG
+  - ./scripts/config -e XENO_DRIVERS_ANALOGY_DEBUG_FTRACE
+  - ./scripts/config -e XENO_DRIVERS_ANALOGY_8255
+  - ./scripts/config -e XENO_DRIVERS_ANALOGY_PARPORT
+  - ./scripts/config -e XENO_DRIVERS_ANALOGY_NI_MITE
+  - ./scripts/config -e XENO_DRIVERS_ANALOGY_NI_TIO
+  - ./scripts/config -e XENO_DRIVERS_ANALOGY_NI_MIO
+  - ./scripts/config -e XENO_DRIVERS_ANALOGY_NI_PCIMIO
+  - ./scripts/config -e XENO_DRIVERS_ANALOGY_NI_670x
+  - ./scripts/config -e XENO_DRIVERS_ANALOGY_NI_660x
+  - ./scripts/config -e XENO_DRIVERS_ANALOGY_S526
+  - ./scripts/config -e XENO_DRIVERS_ANALOGY_FAKE
+  - ./scripts/config -e XENO_DRIVERS_AUTOTUNE
+  - ./scripts/config -e XENO_DRIVERS_CAN
+  - ./scripts/config -e XENO_DRIVERS_CAN_DEBUG
+  - ./scripts/config -e XENO_DRIVERS_CAN_LOOPBACK
+  - ./scripts/config -e XENO_DRIVERS_CAN_BUS_ERR
+  - ./scripts/config -e XENO_DRIVERS_CAN_VIRT
+  - ./scripts/config -e XENO_DRIVERS_CAN_FLEXCAN
+  - ./scripts/config -e XENO_DRIVERS_GPIO
+  - ./scripts/config -e XENO_DRIVERS_GPIO_SUN8I_H3
+  - ./scripts/config -e XENO_DRIVERS_GPIO_DEBUG
+  - ./scripts/config -e XENO_DRIVERS_GPIOPWM
+  - ./scripts/config -e XENO_DRIVERS_RTIPC
+  - ./scripts/config -e XENO_DRIVERS_NET
+  - ./scripts/config -e XENO_DRIVERS_16550A
+  - ./scripts/config -e XENO_DRIVERS_SPI
+  - ./scripts/config -e XENO_DRIVERS_TIMERBENCH
+  - ./scripts/config -e XENO_DRIVERS_UDD
+
+  - popd
+
+script:
+  - ./scripts/prepare-kernel.sh --ipipe=/tmp/ipipe.patch --arch=${ARCH} --linux=${KDIR}
+  - cd ${KDIR}
+  - make -j $(nproc) olddefconfig
+  - make -j $(nproc) all
+
+matrix:
+  include:
+    - env:
+      - ARCH: arm
+        KERNEL_VERSION: 4.14.85
+        KERNEL_DEFCONFIG: multi_v7_defconfig
+        IPIPE_URL: https://xenomai.org/downloads/ipipe/v4.x/arm/ipipe-core-4.14.85-arm-6.patch
+    - env:
+      - ARCH: arm
+        KERNEL_VERSION: 4.1.18
+        KERNEL_DEFCONFIG: multi_v7_defconfig
+        IPIPE_URL: https://xenomai.org/downloads/ipipe/v4.x/arm/older/ipipe-core-4.1.18-arm-9.patch
+    - env:
+      - ARCH: x86
+        KERNEL_VERSION: 4.14.89
+        KERNEL_DEFCONFIG: x86_64_defconfig
+        IPIPE_URL: https://xenomai.org/downloads/ipipe/v4.x/x86/ipipe-core-4.14.89-x86-2.patch
+    - env:
+      - ARCH: x86
+        KERNEL_VERSION: 4.4.166
+        KERNEL_DEFCONFIG: i386_defconfig
+        IPIPE_URL: https://xenomai.org/downloads/ipipe/v4.x/x86/ipipe-core-4.4.166-x86-12.patch