#!/bin/bash -ex

$CC --version

# Express the compiler version as an integer.  e.g. GCC 4.9.2 => 0x040902
cc-ver()
{
    $CC -dumpversion | awk -F. '{ printf "0x%02x%02x%02x", $1, $2, $3 }'
}

# random config or default config
if [[ "${RANDCONFIG}" == "y" ]]; then
    make -C xen KCONFIG_ALLCONFIG=tools/kconfig/allrandom.config randconfig
else
    make -C xen defconfig
fi

# build up our configure options
cfgargs=()
cfgargs+=("--enable-docs")

if [[ "${CC}" == "clang"* ]]; then
    # SeaBIOS cannot be built with clang
    cfgargs+=("--with-system-seabios=/usr/share/seabios/bios.bin")
    # iPXE cannot be built with clang
    cfgargs+=("--with-system-ipxe=/usr/lib/ipxe/ipxe.pxe")
    # newlib cannot be built with clang so we cannot build stubdoms
    cfgargs+=("--disable-stubdom")
fi

# Qemu requires Python 3.5 or later
if ! type python3 || python3 -c "import sys; res = sys.version_info < (3, 5); exit(not(res))"; then
    cfgargs+=("--with-system-qemu=/bin/false")
fi

# SeaBIOS requires GCC 4.6 or later
if [[ "${CC}" == "gcc" && `cc-ver` -lt 0x040600 ]]; then
    cfgargs+=("--with-system-seabios=/bin/false")
fi

./configure "${cfgargs[@]}"

make -j$(nproc) dist

# Extract artifacts to avoid getting rewritten by customised builds
cp xen/.config xen-config
mkdir binaries
if [[ "${XEN_TARGET_ARCH}" == "x86_64" ]]; then
    cp xen/xen binaries/xen
fi

# Build all the configs we care about
case ${XEN_TARGET_ARCH} in
    x86_64) arch=x86 ;;
    *) exit 0 ;;
esac

cfg_dir="automation/configs/${arch}"
for cfg in `ls ${cfg_dir}`; do
    echo "Building $cfg"
    make -j$(nproc) -C xen clean
    rm -f xen/.config
    make -C xen KBUILD_DEFCONFIG=../../../../${cfg_dir}/${cfg} XEN_CONFIG_EXPERT=y defconfig
    make -j$(nproc) -C xen XEN_CONFIG_EXPERT=y
done