#!/usr/bin/make -f

# Disable branch hardening to fix build failure of arch:all build
# https://bugs.debian.org/1052724
export DEB_BUILD_MAINT_OPTIONS=hardening=-branch

include /usr/share/dpkg/architecture.mk
include /usr/share/dpkg/pkg-info.mk

DEBIAN_REVISION ?= $(shell echo $(DEB_VERSION) | sed -e 's,.*+dfsg,+dfsg,')

include debian/targets.mk

ifneq ($(DEB_BUILD_GNU_TYPE),$(DEB_HOST_GNU_TYPE))
CROSS_COMPILE ?= $(DEB_HOST_GNU_TYPE)-
cross_build_tools ?= y
endif

# Enable verbose build by default, disable when terse is specified.
ifneq (,$(filter terse,$(DEB_BUILD_OPTIONS)))
VERBOSE=0
else
VERBOSE=1
endif
common_make_args += V=$(VERBOSE)

# the upstream build passes LDFLAGS directly to ld instead of calling gcc for
# linking; so instead of passing -Wl,foo in LDFLAGS as in automake builds, one
# should set LDFLAGS to foo directly
comma := ,
LDFLAGS := $(patsubst -Wl$(comma)%,%,$(LDFLAGS))

notools := $(filter pkg.uboot.notools,$(DEB_BUILD_PROFILES))

subarchs := $(shell dh_listpackages --arch --no-package=u-boot-tools)

# Each .deb P in subarch contains $(P_platforms).
# These profiles remove values from $(P_platforms) for debugging.

# DEB_BUILD_PROFILES='pkg.uboot.subarch.P1 pkg.uboot.subarch.P2'
# removes all platforms but in packages u-boot-P1 u-boot-P2.
only_subarchs := $(patsubst pkg.uboot.subarch.%,u-boot-%,\
                   $(filter pkg.uboot.subarch.%,$(DEB_BUILD_PROFILES)))
ifneq (,$(only_subarchs))
  $(foreach pkg,$(filter-out $(only_subarchs),$(subarchs)),$(eval \
    $(pkg)_platforms :=))
endif

# DEB_BUILD_PROFILES='pkg.uboot.platform.P1 pkg.uboot.platform.P2'
# removes all platforms but P1 P2.
only_platforms := $(patsubst pkg.uboot.platform.%,%,\
                    $(filter pkg.uboot.platform.%,$(DEB_BUILD_PROFILES)))
ifneq (,$(only_platforms))
  $(foreach pkg,$(subarchs),$(eval \
    $(pkg)_platforms := $(filter $(only_platforms),$($(pkg)_platforms))))
endif

# Enable debugging symbols and remove build paths
HOSTCFLAGS = -g -ffile-prefix-map=$(CURDIR)=.
common_make_args += HOSTCFLAGS='$(HOSTCFLAGS)'

%:
	dh $@

override_dh_auto_build-indep: u-boot-qemu
override_dh_auto_build-arch: $(subarchs)
ifeq ($(notools),)
  override_dh_auto_build-arch: build-tools
endif

# These intermediate per-package targets are convenient to add
# prerequisites to a subarch, but they are empty by default so we need
# to prevent Make applying the default %: recipe above.
.PHONY: u-boot-qemu $(subarchs)

define build_template

  # Tell Make to build the platform as part of the package.
  $(package): $(platform)

  # Qemu platforms set $(platform)_CROSS_COMPILE.
  $(platform):
	# debian/rules: building platform: $(platform)
	mkdir -p debian/build/$(platform)

	dh_auto_build -- $(common_make_args) \
	  O=debian/build/$(platform) \
	  CROSS_COMPILE=$(or $($(platform)_CROSS_COMPILE),$(CROSS_COMPILE)) \
	  $($(package)_assigns) $($(platform)_assigns) \
	  $(platform)_defconfig

	sed -i -e 's,^CONFIG_LOCALVERSION=.*,CONFIG_LOCALVERSION="$(DEBIAN_REVISION)",' \
	  debian/build/$(platform)/.config

	dh_auto_build -- $(common_make_args) \
	  O=debian/build/$(platform) \
	  CROSS_COMPILE=$(or $($(platform)_CROSS_COMPILE),$(CROSS_COMPILE)) \
	  $($(package)_assigns) $($(platform)_assigns)

    ifneq (,$(filter uboot.elf,$($(platform)_targets)))
	cp -u debian/build/$(platform)/u-boot debian/build/$(platform)/uboot.elf
    endif
    ifeq ($(package),u-boot-qemu)
      # TODO: --strip-unneeded as policy recommends? If not, why?
	$($(platform)_CROSS_COMPILE)strip --remove-section=.comment --remove-section=.note \
	  debian/build/$(platform)/uboot.elf
    endif
    # Upstream generates executable targets (last checked with 2020-10).
	chmod -x $(addprefix debian/build/$(platform)/,$($(platform)_targets))

  install-$(platform):
	dh_install -p$(package) $(addprefix debian/build/$(platform)/,$($(platform)_targets)) usr/lib/u-boot/$(platform)

endef
$(foreach package, u-boot-qemu $(subarchs),\
  $(foreach platform, $($(package)_platforms),\
    $(eval $(build_template))))

TOOLSDIR := debian/build/tools
build-tools:
	dh_auto_build -- $(common_make_args) \
	  O=$(TOOLSDIR) \
	  CROSS_COMPILE=$(CROSS_COMPILE) \
	  tools-only_defconfig
	cp $(TOOLSDIR)/.config $(TOOLSDIR)/config
	# board-independent tools
	dh_auto_build -- $(common_make_args) \
		O=$(TOOLSDIR) \
		CROSS_COMPILE=$(CROSS_COMPILE) \
		CROSS_BUILD_TOOLS=$(cross_build_tools) \
		NO_SDL=1 \
	    tools-all

# Only test when tools are built and native.
override_dh_auto_test-arch:
  ifeq ($(notools)$(cross_build_tools),)
	BASEDIR=$(TOOLSDIR) test/image/test-imagetools.sh
  endif
override_dh_auto_test-indep:

# Do not spend time searching for an install target in Makefile.
override_dh_auto_install:

# override_ would require to test notools, which is unrelated.
execute_after_dh_install-indep: $(addprefix install-,$(u-boot-qemu_platforms)) installdocs-u-boot-qemu
execute_after_dh_install-arch: $(addprefix install-,$(foreach package,$(subarchs),$($(package)_platforms))) $(addprefix installdocs-,$(subarchs))

installdocs-%:
	mkdir -p debian/build/$*/configs
	for platform in $($*_platforms); do \
	  cp -u debian/build/$$platform/.config debian/build/$*/configs/config.$$platform; \
	done
	dh_installdocs -p$* debian/build/$*/configs

override_dh_clean:
	rm -rf debian/build/
	rm -f linux.itb linux.its
	dh_clean $(dh_clean_args)
	find . -type d -name __pycache__ -delete

override_dh_gencontrol:
	dh_gencontrol -- $(dpkg-gencontrol_args) $(foreach package,\
	  u-boot-qemu $(subarchs),\
	  '-V$(package):platforms=$(subst $() ,$${Newline},$($(package)_platforms))')