./eosio_build.sh -m // 添加参数支持mongo


function usage() {
   printf "Usage: $0 OPTION...
  -P          Build with pinned clang and libcxx
  -o TYPE     Build <Debug|Release|RelWithDebInfo|MinSizeRel> (default: Release)
  -s NAME     Core Symbol Name <1-7 characters> (default: SYS)
  -b DIR      Use pre-built boost in DIR
  -i DIR      Directory to use for installing dependencies & EOSIO (default: $HOME)
  -y          Noninteractive mode (answers yes to every prompt)
  -c          Enable Code Coverage
  -d          Generate Doxygen
  -m          Build MongoDB dependencies
   \\n" "$0" 1>&2
   exit 1