cc-selector.sh

# create CC, CXX, CC_host and CXX_host environment variables appropriate for the
# worker label in use. Of the form: cross-compiler-ubuntu1[68]04-armv[67]-gcc-(4\.9.4?|6|8)

# Expected labels:
# cross-compiler-ubuntu1604-armv6-gcc-4.9.4
# cross-compiler-ubuntu1604-armv7-gcc-4.9.4
# cross-compiler-ubuntu1604-armv7-gcc-6
# cross-compiler-ubuntu1804-armv7-gcc-6
# cross-compiler-ubuntu1804-armv7-gcc-8

rpi_newer_tools_base="/opt/raspberrypi/rpi-newer-crosstools/"
base_4_9_4="${rpi_newer_tools_base}x64-gcc-4.9.4-binutils-2.28/arm-rpi-linux-gnueabihf/bin/arm-rpi-linux-gnueabihf-"
base_6="${rpi_newer_tools_base}x64-gcc-6.5.0/arm-rpi-linux-gnueabihf/bin/arm-rpi-linux-gnueabihf-"
base_8="${rpi_newer_tools_base}x64-gcc-8.3.0/arm-rpi-linux-gnueabihf/bin/arm-rpi-linux-gnueabihf-"
flags_armv6="-march=armv6zk"
flags_armv7="-march=armv7-a"

function run {
  local label="$1"

  export arm_type=$(echo $label | sed -E 's/^cross-compiler-ubuntu1[68]04-(armv[67])-gcc-.*$/\1/')
  export gcc_version=$(echo $label | sed -E 's/^cross-compiler-ubuntu1[68]04-armv[67]-gcc-(4\.9\.4|6|8)/\1/')
  export git_branch="cc-${arm_type}"

  if [[ ! "$arm_type" =~ ^armv[67]$ ]]; then
    echo "Could not determine ARM type from '$label'"
    exit 1
  fi
  if [[ ! "$gcc_version" =~ ^(4\.9\.4|6|8)$ ]]; then
    echo "Could not determine ARM type from '$label'"
    exit 1
  fi

  gcc_version_safe="$(echo $gcc_version | sed -E 's/\./_/g')"
  gcc_host_version="$(echo $gcc_version | sed -E 's/\.4//g')" # 4.9.4 -> 4.9

  base_varname="base_${gcc_version_safe}"
  flags_varname="flags_${arm_type}"

  echo "ARM variant:           $arm_type"
  echo "GCC version:           $gcc_version"
  echo "Using compiler at:     ${!base_varname}gcc"
  echo "Using commpiler flags: ${!flags_varname}"

  export ARCH="${arm_type}l"
  export DESTCPU=arm
  export CC_host="ccache gcc-${gcc_host_version} -m32"
  export CXX_host="ccache g++-${gcc_host_version} -m32"
  export CC="ccache ${!base_varname}gcc ${!flags_varname}"
  export CXX="ccache ${!base_varname}g++ ${!flags_varname}"
}

run $1