set -o nounset

	typeset -li mem_total=-1

	typeset -li swap_total=-1

	typeset -r -li memory_per_job=$2

	typeset -r -li num_cpus=$(getconf '_NPROCESSORS_ONLN')

	typeset -li numjobs_in_memory

	typeset -n numjobs=$1

	read mem_total <<<"$(awk \

		$'/MemTotal/ { print $2 }' \

		<'/proc/meminfo')"

	printf $"%s: mem_total=%d, swap_total=%d\n" \

		"$0" \

	# data in /proc/meminto are in KB, but we need bytes

	(( mem_total*=1024, swap_total*=1024 ))

	# handle read errors

	if (( (mem_total < 0) || (swap_total < 0) )) ; then

		printf $"%s: error, could not read memory data\n" "$0"

		return 1

	fi

	# we need at least 1GB of swap space

	if (( swap_total < (1024*1024*1924) )) ; then

		printf $"#\n# %s: ERROR: Swap memory too low %d\n#\n" "$0" "$swap_total"

	# calculate how much jobs would fit into the memory

	(( numjobs_in_memory = (mem_total+swap_total) / memory_per_job ))

	# restrict the number of jobs to twice the amount of CPUs

	(( numjobs = (numjobs_in_memory > (num_cpus*2))?(num_cpus*2):numjobs_in_memory ))

	# we want at least one job

	(( numjobs = (numjobs >= 1)?numjobs:1 ))

	# statistics

	printf $"%s: numjobs_in_memory=%d\n"	"$0" "$numjobs_in_memory"

	printf $"%s: numjobs=%d\n"		"$0" "$numjobs"

	boost_Version='1_71_0'

	qt_Version='5_15_2'

	# Prebuild RDE build tools (compiler etc)

	# (from $ git clone https://RovemaDevelopment@dev.azure.com/RovemaDevelopment/RDE-Development/_git/Dependencies #)

	#git_rde_dependicies_dir='/cygdrive/h/tmp/winnfstest/hummingbirdnfstest1/rde_windows_developmement/Dependencies/win/'

	#git_rde_dependicies_dir='/home/roland_mainz/work/rde/build_dep/Dependencies/win/'

	git_rde_dependicies_dir="$(realpath "$PWD/../../Dependencies")/win/"

	if [[ ! -d "$git_rde_dependicies_dir" ]] ; then

	boostpath="${git_rde_dependicies_dir}/boost/boost_${boost_Version}/"

	qtpath="${git_rde_dependicies_dir}/qt/qt_${qt_Version}/"

	printf $"# building with boost version %s and qt version %s\n" "$boost_Version" "qt_Version"

	# Setting-up PATH

	export PATH="$qtpath/Tools/mingw810_64/bin/:$qtpath/5.15.2/mingw81_64/bin/:$qtpath/Tools/CMake_64/bin/:$boostpath/bin/:$boostpath/lib/:$PATH"

function probe_paths

{

	return 0

}

#

# Build

#

function build_clean

{

	printf $"# Cleanup old build stuff ...\n"

	rm -Rf CMake* CPack* CTestTestfile.cmake app_translations.qrc cmake_install.cmake nowide tests RDS Makefile *.qm rde.rc rde_autogen tmp versioninfo.cpp

	return 0

}

function build_cmake_config

{

	printf $"# Running build configuration via cmake ...\n"

	# note: Windows/minGW uses '-G "MinGW Makefiles"', while compiling with Cygwin requires '-G "Unix Makefiles"'

	cmake -G "Unix Makefiles" -DBOOST_ROOT="$boostpath" -DBoost_LIB_PREFIX="lib" -DBoost_USE_STATIC_LIBS=TRUE -DBoost_ARCHITECTURE="-x64" -DBUILD_TESTS=ON ".."

	return 0

}

function build_cmake_clean

{

	printf $"# Target clean ...\n"

	cmake --build . -j 1 --target clean

	return 0

}

function build_cmake_targets

{

	typeset -li num_parallel_jobs=$1

	printf $"# Building ...\n"

	cmake --build . -j $num_parallel_jobs

	printf $"%s: Build done.\n" "$0"

	return 0

}

#

# main

#

set -o errexit

set -o nounset

#set -o xtrace # debug

printf $"%s: Start ...\n" "$0"

# Check whether we are really on Cygwin...

if [[ "$(uname -s)" != *CYGWIN* ]] ; then

	printf $"%s: ERROR: Not a Cygwin environment.\n" "$0" 1>&2

	exit 1

fi

typeset boost_Version qt_Version git_rde_dependicies_dir boostpath qtpath

typeset -li num_parallel_jobs

configure_paths

case "${1-}" in

	'buildall')

		calc_max_parallel_jobs num_parallel_jobs $((512*1024*1024)) || exit 1

		probe_paths

		build_clean

		build_cmake_config

		build_cmake_clean

		build_cmake_targets "$num_parallel_jobs"

		;;

	'clean')

		build_clean

		;;

	'run')

		./rde

		exit $?

		;;

	*)

		printf $"%s: Unknown cmd %q\n" "$0" "${1-}" 1>&2

		exit 1

		;;

esac

exit 0

# EOF.