Simple bash function which finds a number of compilation databases and passes them into my cc_merge script.

merge.sh

#!/bin/bash
MergeCompileCommands()
{
  BIN_DIR=$1
  OUT_FILE=$BIN_DIR/compile_commands.json 

  command -v node >/dev/null 2>&1 || { echo >&2 "Node.js (node) is required but not installed. Aborting."; exit 1; }
  command -v npm >/dev/null 2>&1 || { echo >&2 "Node.js' package manager (npm) is required not installed. Aborting."; exit 1; }

  # Ensure node app is setup correctly (look for node_modules in target dir).
  # ccMerge = compile commands merge.
  NODE_MERGER_DIR=${HOME}/prosp/common/cc_merge
  if [ ! -d $NODE_MERGER_DIR/node_modules ]; then
    pushd $NODE_MERGER_DIR &> /dev/null
      echo "Running npm install in NODE_MERGER_DIR"
      npm install
    popd &> /dev/null
  fi

  # Gather all of the compile_commands.json files.
  COMPILE_COMMANDS_FILES=`find $BIN_DIR -name compile_commands.json`

  # Loop through in an attempt to find $OUT_FILE.
  # Once found, remove it from the list.
  # See: http://superuser.com/questions/196572/check-if-two-paths-are-pointing-to-the-same-file
  FILTERED_COMMANDS_FILES=''
  PRIOR_COMMAND=false
  for file in $COMPILE_COMMANDS_FILES ; do
    # Only use files that do NOT match the output file.
    if ! [ $OUT_FILE -ef $file ]; then
      if $PRIOR_COMMAND ; then
        FILTERED_COMMANDS_FILES="$FILTERED_COMMANDS_FILES
$file"
      else
        FILTERED_COMMANDS_FILES=$file
        PRIOR_COMMAND=true
      fi
    fi
  done

  # Run node now that all of the dependencies are correctly handled.
  # This will merge all of the compile_commands.json files into one, with 
  # already existing files being overwritten in OUT_FILE.
  pushd $NODE_MERGER_DIR &> /dev/null
    echo "Running compile_commands.json merging utility."
    node cc_merge.js -o $OUT_FILE $FILTERED_COMMANDS_FILES
  popd &> /dev/null
}