gcc_version=$(gcc -dumpversion | sed -e 's/\.\([0-9][0-9]\)/\1/g' -e 's/\.\([0-9]\)/0\1/g' -e 's/^[0-9]\{3,4\}$/&00/')

if [ $gcc_version -gt 40900 ]
then
  echo "gcc version $(gcc -dumpversion) is greater than 4.9.0"
else
  echo "gcc version $(gcc -dumpversion) is lower than 4.9.0"
fi