#!/bin/sh
#
# helper script to quick build testing with cross-compilers
#

: ${MAKE:=make}

: ${BUILD_NCPUS:=$(getconf _NPROCESSORS_ONLN)}
if [ "$BUILD_NCPUS" -gt 1 ] ; then
	JOBS=-j$((BUILD_NCPUS + 1))
else
	JOBS=""
fi
MAKE="${MAKE} ${JOBS}"

: ${CROSS_COMPILE:=${CROSS_COMPILER_PREFIX}}

setconfig()
{
	local opt=$1
	shift
	case $1 in
		[yn])   ;;
		[0-9]*) ;;
		*)      set -- '"'$*'"'
	esac
	sed -i \
		-e "/${opt}=/s:=.*:=$*:" \
		.config
	echo "  ## setconfig ${opt} $*"
}

get_arches()
{
	case $1 in
		hppa) echo hppa hppa2.0 hppa1.1 hppa1.0;;
		i386) echo i386 i486 i586 i686;;
		sh) echo sh4 sh2 sh3 sh1 sh;;
		sparc) echo sparc sparc64;;
		*)  echo $1;;
	esac
}

find_compiler()
{
	local t a v o l
	for a in $(get_arches $1) ; do
		for l in uclibc gnu gnueabi "" ; do
			for v in unknown pc gentoo "" ; do
				for o in linux uclinux "" ; do
					t="${a}${v:+-${v}}${o:+-${o}}${l:+-${l}}"
					if ${t}-gcc --help > /dev/null 2>&1 ; then
						echo ${t}-
						return 0
					fi
				done
			done
		done
	done
}

do_make()
{
	echo "  ## ${MAKE} -s $*"
	${MAKE} -s "$@"
}

mark_arch()
{
	local r=$1 a=$2
	eval $r=\"\$$r $a\"
}

if [ -z "$*" ] ; then
	set -- $(awk \
		'$0 ~ /^config TARGET_/ { sub("TARGET_",""); print $NF }' \
		extra/Configs/Config.in | grep -v SUBARCH)
fi
pass=""
fail=""
skip=""
for a in "$@" ; do
	if [ -z "${CROSS_COMPILE}" ] ; then
		CROSS_COMPILE=$(find_compiler ${a})
	fi

	if [ -z "${CROSS_COMPILE}" ] ; then
		mark_arch skip $a
		echo " ### SKIP: ${a}: could not find compiler"
		continue
	fi

	rm -f ${a}.log ${a}.fail
	(
	set -e

	echo " ### Building target ${a} (${CROSS_COMPILE})"

	do_make distclean
	do_make ARCH=$a defconfig
	do_make oldconfig

	setconfig CROSS_COMPILER_PREFIX ${CROSS_COMPILE}

	header_path=${KERNEL_HEADERS:-$(echo '#include <linux/version.h>' | ${CROSS_COMPILE}cpp 2>/dev/null | grep -o '[^"]*linux/version.h')} || :
	if [ -z "${header_path}" ] ; then
		for p in /usr/${CROSS_COMPILE%-}/usr/include ; do
			if [ -e ${p}/linux/version.h ] ; then
				header_path=${p}
				break
			fi
		done
		if [ -z "${header_path}" ] ; then
			echo "  ## unable to locate KERNEL_HEADERS"
		fi
	fi
	setconfig KERNEL_HEADERS ${header_path%/linux/version.h}

	if do_make ; then
		echo "  ## PASS"
	else
		echo "  ## FAIL"
		touch ${a}.fail
	fi
	) 2>&1 | tee ${a}.log

	if [ -e ${a}.fail ] ; then
		rm -f ${a}.fail
		mark_arch fail $a
	else
		mark_arch pass $a
	fi

	unset CROSS_COMPILE
done

if [ -n "${skip}" ] ; then
	printf '\nSKIPPED: %s\n' "${skip}"
fi
if [ -n "${fail}" ] ; then
	printf '\nPASSED: %s\nFAILED: %s\n\n' "${pass}" "${fail}"
	exit 1
else
	printf '\nAll arches passed!\n\n'
	exit 0
fi