build.sh

#!/bin/bash

QT_CFG=''

COMPILE_JOBS=1

MAKEFLAGS_JOBS=$(echo $MAKEFLAGS | egrep -o '\-j[0-9]+' | egrep -o '[0-9]+')
if [[ "$MAKEFLAGS_JOBS" != "" ]]; then
  # user defined number of jobs in MAKEFLAGS, re-use that number
  COMPILE_JOBS=$MAKEFLAGS_JOBS
elif [[ $OSTYPE = darwin* ]]; then
   # We only support modern Mac machines, they are at least using
   # hyperthreaded dual-core CPU.
   COMPILE_JOBS=4
else
   CPU_CORES=`grep -c ^processor /proc/cpuinfo`
   if [[ "$CPU_CORES" -gt 1 ]]; then
       COMPILE_JOBS=$CPU_CORES
       if [[ "$COMPILE_JOBS" -gt 8 ]]; then
           # Safety net.
           COMPILE_JOBS=8
       fi
   fi
fi


until [ -z "$1" ]; do
    case $1 in
        "--qt-config")
            shift
            QT_CFG=" $1"
            shift;;
        "--jobs")
            shift
            COMPILE_JOBS=$1
            shift;;
        "--help")
            echo "Usage: $0 [--qt-config CONFIG] [--jobs NUM]"
            echo
            echo "  --qt-config CONFIG          Specify extra config options to be used when configuring Qt"
            echo "  --jobs NUM                  How many parallel compile jobs to use. Defaults to 4."
            echo
            exit 0
            ;;
        *)
            echo "Unrecognised option: $1"
            exit 1;;
    esac
done

cd src/qt && ./preconfig.sh --jobs $COMPILE_JOBS --qt-config "$QT_CFG" && cd ../..
src/qt/bin/qmake
make -j$COMPILE_JOBS