select-gcc

#!/usr/bin/env bash

set -e

GCC_PATH=/usr/local/bin/gcc

usage() {
  echo "$(basename $0) [fsf/apple]" >&2
}

if [[ $# -ne 1 ]]
then
  usage
  exit 1
fi

if [[ -L $GCC_PATH ]]
then
  rm $GCC_PATH
fi

case "$1" in
  fsf)
    ln -s /usr/local/bin/gcc-7 $GCC_PATH
    exit 0
    ;;
  apple)
    ln -s /usr/bin/gcc $GCC_PATH
    exit 0
    ;;
esac

echo 'bad parameter' >&2
exit 1