#! /usr/bin/make -f

DEB_BUILD_GNU_TYPE ?= $(shell dpkg-architecture -qDEB_BUILD_GNU_TYPE)
DEB_HOST_GNU_TYPE ?= $(shell dpkg-architecture -qDEB_HOST_GNU_TYPE)

DEB_HOST_ARCH ?= $(shell dpkg-architecture -qDEB_HOST_ARCH)

BUILD_DATE := $(shell dpkg-parsechangelog --show-field Date)

ifeq ($(DEB_BUILD_GNU_TYPE),$(DEB_HOST_GNU_TYPE))
CROSS =
else
ifeq ($(shell which $(DEB_HOST_GNU_TYPE)-gcc),)
$(warning Can not find $(DEB_HOST_GNU_TYPE)-gcc)
ifeq ($(DEB_BUILD_GNU_TYPE),$(subst uclibc,gnu,$(DEB_HOST_GNU_TYPE)))
$(warning -> Using native compiler instead)
CROSS =
else
ifneq ($(shell which $(subst uclibc,gnu,$(DEB_HOST_GNU_TYPE))-gcc),)
$(warning -> Using $(subst uclibc,gnu,$(DEB_HOST_GNU_TYPE))-gcc instead)
CROSS = $(subst uclibc,gnu,$(DEB_HOST_GNU_TYPE))-
else
$(error No $(subst uclibc,gnu,$(DEB_HOST_GNU_TYPE))-gcc either.)
endif
endif
else
CROSS = $(DEB_HOST_GNU_TYPE)-
endif
endif

parallel = $(patsubst parallel=%,-j%,$(filter parallel=%,$(DEB_BUILD_OPTIONS)))

version = 1.0.20

pwd = $(shell pwd)

packages_arch_uclibc_linux_amd64_debian = uclibc$(version) uclibc-dev
packages_arch_uclibc_linux_armel_debian = uclibc$(version) uclibc-dev
packages_arch_uclibc_linux_armebuc_debian = uclibc$(version) uclibc-dev
packages_arch_uclibc_linux_powerpc_debian = uclibc$(version) uclibc-dev
packages_arch_uclibc_linux_emdebian = libc$(version)uc libm$(version)uc

packages_indep_debian = uclibc-source

config_uclibc_linux_amd64_debian = config-amd64
config_uclibc_linux_armel_debian = config-armel
config_uclibc_linux_armebuc_debian = config-armebuc
config_uclibc_linux_powerpc_debian = config-powerpc

arch_uclibc_linux_amd64_debian = x86_64
arch_uclibc_linux_armel_debian = arm
arch_uclibc_linux_armebuc_debian = arm
arch_uclibc_linux_powerpc_debian = powerpc

vendor = $(shell \
    dpkg-vendor --derives-from emdebian && echo emdebian || \
    dpkg-vendor --derives-from debian && echo debian)

ifeq ($(vendor),)
$(error Vendor not supported)
endif

host = $(subst -,_,$(DEB_HOST_ARCH))

type = $(host)_$(vendor)

config = $(config_$(type))
arch = $(arch_$(type))

packages_arch = $(packages_arch_$(type))
packages_indep = $(packages_indep_$(vendor))

ifneq ($(packages_arch),)
ifeq ($(config),)
$(error No configuration)
endif
ifeq ($(arch),)
$(error No mapping from Debian to uClibc arch name)
endif
endif

build: build-arch build-indep
build-arch: $(packages_arch:%=build-%)
build-indep: $(packages_indep:%=build-%)

binary: binary-arch binary-indep
binary-arch: $(packages_arch:%=binary-%)
	@
binary-indep: $(packages_indep:%=binary-%)
	@

clean:
	dh_testdir
	dh_testroot
	dh_clean
	$(RM) -r build
	$(RM) -rf debian/include

build-uclibc$(version): build-default

build-default: build/default/.config debian/include
	$(MAKE) $(parallel) libs O=$(pwd)/build/default ARCH=$(arch) CROSS=$(CROSS) V=2

build/default/.config: debian/$(config)
	dh_testdir
	mkdir -p build/default
	cp $< $@

debian/include:
	$(RM) -rf $@
	mkdir $@
	ln -s /usr/include/$(DEB_HOST_MULTIARCH)/asm $@/
	ln -s /usr/include/asm-generic $@/
	ln -s /usr/include/linux $@/

ifneq ($(interactive),)
debian/$(config):
	dh_testdir
	mkdir -p build/default
	$(MAKE) $(parallel) menuconfig O=$(pwd)/build/default ARCH=$(arch)
	cp build/default/.config $@
endif

build-uclibc-source: build/uClibc-ng-$(version).tar.xz

build/uClibc-ng-$(version).tar.xz: build/uClibc-ng-$(version).tar
	xz -9k <$< >$@

build/uClibc-ng-$(version).tar:
	dh_testdir
	mkdir -p build
	tar -cf $@ --mtime="$(BUILD_DATE)" --exclude=./build --transform s@^\.@uClibc-ng-$(version)@ .

binary-%: build-%
	dh_testdir
	dh_testroot
	dh_prep -p$*
	dh_installchangelogs -p$*
	dh_installdocs -p$*
	dh_install -p$*
	dh_compress -p$*
	dh_fixperms -p$*
	dh_installdeb -p$*
	dh_shlibdeps -p$*
	dh_gencontrol -p$*
	dh_md5sums -p$*
	dh_builddeb -p$*