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SHELL=/bin/bash
SUDO=$(shell which sudo)
DBOOTSTRAP=$(shell ${SUDO} which qemu-debootstrap)
DBOOTSTRAP2=$(shell ${SUDO} which debootstrap)
FAKEROOT=$(shell which fakeroot)
PACKAGES=locales systemd

MAKEFILE_PATH := $(abspath $(lastword $(MAKEFILE_LIST)))
CWD := $(dir $(MAKEFILE_PATH))

# extend path to sbin binaries
export PATH := /usr/sbin:${PATH}

ifeq (${FAKEROOT},)
$(error fakeroot not found. On debian, you may install the package fakeroot first)
endif

ifeq (${DBOOTSTRAP},)
$(error qemu-debootstrap not found. On debian, you may install the package qemu-user-static first)
endif

ifeq (${DBOOTSTRAP2},)
$(error debootstrap not found. On debian, you may install the package debootstrap first)
endif

FAKEROOT+=-s ${CWD}/.fakeroot

-include debian_version.mk

.PHONY: test
test:
	echo ${FAKEROOT}


#
# Debian / ARM Hardfloat
#
.PHONY: debian_armhf_%.tar
debian_armhf_%.tar: 
	-mkdir ./$$(basename $@ .tar)
	${SUDO} ${DBOOTSTRAP} --arch=armhf --variant=minbase --include="${PACKAGES}" $* ./$$(basename $@ .tar) http://ftp.debian.org/debian/
	(echo "deb http://ftp.debian.org/debian $* main"; \
	 echo "deb-src http://ftp.debian.org/debian $* main") | ${SUDO} tee ./$$(basename $@ .tar)/etc/apt/sources.list
	cd $$(basename $@ .tar); ${SUDO} tar -cf "../$@" .
	${SUDO} rm -R ./$$(basename $@ .tar)
	echo DEBIAN_VERSION=$* > debian_version.mk
	echo GCC_POSTFIX=-arm-none-eabi >> debian_version.mk
	echo LIBC_POSTFIX=-armhf-cross >> debian_version.mk

#
# Debian / ARM EABI
#
.PHONY: debian_armel_%.tar
debian_armel_%.tar: 
	-mkdir ./$$(basename $@ .tar)
	${SUDO} ${DBOOTSTRAP} --arch=armel --variant=minbase --include="${PACKAGES}" $* ./$$(basename $@ .tar) http://ftp.debian.org/debian/
	(echo "deb http://ftp.debian.org/debian $* main"; \
	 echo "deb-src http://ftp.debian.org/debian $* main") | ${SUDO} tee ./$$(basename $@ .tar)/etc/apt/sources.list
	cd $$(basename $@ .tar); ${SUDO} tar -cf "../$@" .
	${SUDO} rm -R ./$$(basename $@ .tar)
	echo DEBIAN_VERSION=$* > debian_version.mk
	echo GCC_POSTFIX=-arm-none-eabi >> debian_version.mk
	echo LIBC_POSTFIX=-armel-cross >> debian_version.mk

#
# Debian x86
#
.PHONY: debian_%.tar
debian_%.tar: 
	-mkdir ./$$(basename $@ .tar)
	${SUDO} ${DBOOTSTRAP} --arch=i386 --variant=minbase --include="${PACKAGES}" $* ./$$(basename $@ .tar) http://ftp.debian.org/debian/
	(echo "deb http://ftp.debian.org/debian $* main"; \
	 echo "deb-src http://ftp.debian.org/debian $* main") | ${SUDO} tee ./$$(basename $@ .tar)/etc/apt/sources.list
	cd $$(basename $@ .tar); ${SUDO} tar -cf "../$@" .
	${SUDO} rm -R ./$$(basename $@ .tar)
	echo DEBIAN_VERSION=$* > debian_version.mk
	echo GCC_POSTFIX= >> debian_version.mk
	echo LIBC_POSTFIX= >> debian_version.mk

#
# Debian Cross-Toolchain
#
debian_toolchain.tar:
	-mkdir ./$$(basename $@ .tar)
	${SUDO} ${DBOOTSTRAP} --arch=i386 --variant=minbase --include="gcc${GCC_POSTFIX} libstdc++-6-dev${LIBC_POSTFIX} libc6-dev${LIBC_POSTFIX}" ${DEBIAN_VERSION} ./$$(basename $@ .tar) http://ftp.debian.org/debian/
	cd $$(basename $@ .tar); ${SUDO} tar -cf "../$@" .
	${SUDO} rm -R ./$$(basename $@ .tar)

#
# Export environment shell script for the toolchain
#

define ENV_SH
TC_PATH=$$(dirname $$_)

SYSROOT=$${TC_PATH}/target
INCLUDEDIR=$${TC_PATH}/host/usr/arm-linux-gnueabihf/include/
LIBRARYDIR=$${TC_PATH}/target/usr/lib/arm-linux-gnueabihf/

COMPILE_PREFIX=$${TC_PATH}/host/usr/bin/arm-none-eabi-
PLUGINDIR=$$(dirname $$(readlink -f $${TC_PATH}/host/usr/lib/gcc/arm-none-eabi/*/liblto_plugin.so))
HOSTLIBDIR=$${TC_PATH}/host/usr/lib/i386-linux-gnu/:$${TC_PATH}/host/usr/lib/:$${TC_PATH}/host/lib

LD_LIBRARY_PATH=$${HOSTLIBDIR}
CC=$${COMPILE_PREFIX}gcc
CXX=$${COMPILE_PREFIX}cpp
LD=$${COMPILE_PREFIX}ld
AS=$${COMPILE_PREFIX}as
AR=$${COMPILE_PREFIX}ar
NM=$${COMPILE_PREFIX}nm
GCOV=$${COMPILE_PREFIX}gcov
OBJDUMP=$${COMPILE_PREFIX}objdump
CFLAGS=
LDFLAGS=
# common C/LD Flags
CFLAGS="$${CFLAGS} --sysroot=$${SYSROOT}"
CFLAGS="$${CFLAGS} -B$${PLUGINDIR} -mfloat-abi=hard"
LDFLAGS="$${CFLAGS}"
# CFLAGS
CFLAGS="$${CFLAGS} --sysroot=$${SYSROOT}"
CFLAGS="-I$${INCLUDEDIR}"

# LDFLAGS
LDFALGS="-L$${LIBRARYDIR}"
LDFLAGS="$${LDFLAGS} -L$${LIBRARYDIR}"
LDFLAGS="$${LDFLAGS} -B$${LIBRARYDIR}"
LDFLAGS="$${LDFLAGS} -lc"

export CC
export CXX
export LD
export AS
export AR
export NM
export GCOV
export OBJDUMP
export CFLAGS
export LDFLAGS
export LD_LIBRARY_PATH
endef

export ENV_SH

debian_toolchain_env.sh:
	@echo "$${ENV_SH}" > $@

clean:
	rm -f *.piling.tar
	for i in ???????.piling/proc; do sudo umount "./$$i"; sudo rm -Rf "./$$(dirname $$i)"; done