#!/usr/bin/make -f

# For Ubuntu, see #961725
export DEB_LDFLAGS_MAINT_STRIP := "-Wl,-Bsymbolic-functions"

include /usr/share/dpkg/buildflags.mk
include /usr/share/dpkg/pkg-info.mk
SOVER := 0
SRCS := $(filter-out debian $(FLAVORS), $(wildcard ./*))

MAKE_OPTIONS := NO_LAPACKE=1 NO_AFFINITY=1 NO_WARMUP=1 CFLAGS="$(CPPFLAGS) $(CFLAGS)" FFLAGS="$(FFLAGS)"

# Avoid having -O2 automatically added (especially for DEB_BUILD_OPTIONS=noopt)
MAKE_OPTIONS += COMMON_OPT=

# Build generic package with hardcoded max number of threads of 64
GENERIC_OPTIONS := NUM_THREADS=64

# Architectures with dynamic arch selection
# TARGET=GENERIC is needed to avoid FTBFS when CPU detection fails (see #923607)
ENABLE_DYNAMIC_ARCHS := amd64 arm64 i386 kfreebsd-amd64 kfreebsd-i386 ppc64el s390x
ifneq (,$(filter $(DEB_HOST_ARCH),$(ENABLE_DYNAMIC_ARCHS)))
	GENERIC_OPTIONS += DYNAMIC_ARCH=1 DYNAMIC_OLDER=1 TARGET=GENERIC
endif

# For other archs, there is no dynamic arch selection. To avoid selecting a
# target based on the buildd hardware, we enforce a generic-enough target.

# We cannot use the ARMv7 profile on armhf, because it requires a 32-register FP unit.
# See kernel/arm/KERNEL.ARMv7: it loads some *_vfpv3.S files, which use 32 registers.
# Also, it FTBFS if GCC flag -mvfpv3 is removed (see arm-gcc-flags.patch), because GCC
# refuses asm files with 32 FP registers in that case.
# Issue discussed in https://github.com/xianyi/OpenBLAS/issues/388
# See also debian/patches/arm-gcc-flags.patch which is related.
TARGET_OPTION_armhf     = TARGET=ARMV6
# We do not use DYNAMIC_ARCH selection on powerpc and ppc64 because it only
# works for POWER6 and above.
# For a correspondence between CPUs and ISAs, see:
#  https://wiki.raptorcs.com/wiki/Power_ISA
# NB: In OpenBLAS, the POWER3 and POWER4 kernels are actually the same as POWER5.
# NB2: TARGET=POWER4 leads to a FTBFS on powerpc (with OpenBLAS 0.3.16)
TARGET_OPTION_powerpc   = TARGET=PPCG4
TARGET_OPTION_ppc64     = TARGET=POWER4
# We do not use DYNAMIC_ARCH selection on mips64el because it only works for
# Loongson3R3/3R4
TARGET_OPTION_mips64el  = TARGET=SICORTEX
TARGET_OPTION_riscv64   = TARGET=RISCV64_GENERIC
TARGET_OPTION_sparc64   = TARGET=SPARC
GENERIC_OPTIONS += $(TARGET_OPTION_$(DEB_HOST_ARCH))


ifeq (,$(filter custom,$(DEB_BUILD_OPTIONS)))
	# Generic package
	MAKE_OPTIONS += $(GENERIC_OPTIONS)
else
	# Custom package: leave the arch detection to OpenBLAS, and optimize for the current CPU
	export DEB_CFLAGS_MAINT_APPEND := -march=native -mtune=native
	export DEB_FFLAGS_MAINT_APPEND := -march=native -mtune=native
endif

# Flavors: 64-bit array indexing is invalid for 32-bit machines.
ifeq (64,$(DEB_HOST_ARCH_BITS))
	FLAVORS = $(SOVER)-pthread $(SOVER)-openmp $(SOVER)-serial 64-$(SOVER)-pthread 64-$(SOVER)-openmp 64-$(SOVER)-serial
else
	FLAVORS = $(SOVER)-pthread $(SOVER)-openmp $(SOVER)-serial
endif
# FLAVORS =  # XXX: Define your target configurations here if you are going to build customized packages
FLAGS_0-pthread    := USE_THREAD=1 USE_OPENMP=0 INTERFACE64=0 LIBPREFIX=libopenblas   FCOMMON_OPT=-frecursive
FLAGS_0-openmp     := USE_THREAD=1 USE_OPENMP=1 INTERFACE64=0 LIBPREFIX=libopenblas   FCOMMON_OPT='-frecursive -fopenmp'
FLAGS_0-serial     := USE_THREAD=0 USE_OPENMP=0 INTERFACE64=0 LIBPREFIX=libopenblas   FCOMMON_OPT=-frecursive
FLAGS_64-0-pthread := USE_THREAD=1 USE_OPENMP=0 INTERFACE64=1 LIBPREFIX=libopenblas64 FCOMMON_OPT='-frecursive -fdefault-integer-8'
FLAGS_64-0-openmp  := USE_THREAD=1 USE_OPENMP=1 INTERFACE64=1 LIBPREFIX=libopenblas64 FCOMMON_OPT='-frecursive -fopenmp -fdefault-integer-8'
FLAGS_64-0-serial  := USE_THREAD=0 USE_OPENMP=0 INTERFACE64=1 LIBPREFIX=libopenblas64 FCOMMON_OPT='-frecursive -fdefault-integer-8'

# Priority values in the Update-Alternatives mechanism.
# O,P,S stands for openmp, pthread, serial respectively
UAPRI_O = 95
UAPRI_P = 100
UAPRI_S = 90


%:
	dh $@

override_dh_auto_configure: $(addprefix config_, $(FLAVORS))
	:

config_%:
	# shared object packages
	mkdir $*; cp -r $(SRCS) $*/;
	for i in install postinst prerm shlibs; do \
		if test -z "$$(echo $* | grep 64)"; then \
			cp debian/libopenblas$(SOVER)-XXX.$$i debian/libopenblas$*.$$i; \
		else \
			cp debian/libopenblas64-$(SOVER)-XXX.$$i debian/libopenblas$*.$$i; \
		fi; \
		sed -i -e "s/@DEB_HOST_MULTIARCH@/$(DEB_HOST_MULTIARCH)/g" \
			-e "s/@SUBDIR@/openblas$(subst $(SOVER)-,-,$(subst -$(SOVER)-,-,$*))/g" \
			-e "s/@FLAVOR@/$*/g" \
			debian/libopenblas$*.$$i; \
		if test -n "$$(echo $* | grep pthread)"; then \
			sed -i -e "s/@OPENBLAS_PRI@/$(UAPRI_P)/g" debian/libopenblas$*.$$i; \
		elif test -n "$$(echo $* | grep openmp)"; then \
			sed -i -e "s/@OPENBLAS_PRI@/$(UAPRI_O)/g" debian/libopenblas$*.$$i; \
		else \
			sed -i -e "s/@OPENBLAS_PRI@/$(UAPRI_S)/g" debian/libopenblas$*.$$i; \
		fi; \
	done;
	# devel packages
	for i in install links postinst prerm dirs; do \
		if test -z "$$(echo $* | grep 64)"; then \
			cp debian/libopenblas-XXX-dev.$$i debian/libopenblas$(subst $(SOVER)-,-,$(subst -$(SOVER)-,-,$*))-dev.$$i; \
		else \
			cp debian/libopenblas64-XXX-dev.$$i debian/libopenblas$(subst $(SOVER)-,-,$(subst -$(SOVER)-,-,$*))-dev.$$i; \
		fi; \
		sed -i -e "s/@DEB_HOST_MULTIARCH@/$(DEB_HOST_MULTIARCH)/g" \
			-e "s/@SUBDIR@/openblas$(subst $(SOVER)-,-,$(subst -$(SOVER)-,-,$*))/g" \
			-e "s/@FLAVOR@/$*/g" \
			debian/libopenblas$(subst $(SOVER)-,-,$(subst -$(SOVER)-,-,$*))-dev.$$i; \
		if test -n "$$(echo $* | grep pthread)"; then \
			sed -i -e "s/@OPENBLAS_PRI@/$(UAPRI_P)/g" debian/libopenblas$(subst $(SOVER)-,-,$(subst -$(SOVER)-,-,$*))-dev.$$i; \
		elif test -n "$$(echo $* | grep openmp)"; then \
			sed -i -e "s/@OPENBLAS_PRI@/$(UAPRI_O)/g" debian/libopenblas$(subst $(SOVER)-,-,$(subst -$(SOVER)-,-,$*))-dev.$$i; \
		else \
			sed -i -e "s/@OPENBLAS_PRI@/$(UAPRI_S)/g" debian/libopenblas$(subst $(SOVER)-,-,$(subst -$(SOVER)-,-,$*))-dev.$$i; \
		fi; \
	done;

override_dh_auto_build:
	for target in $(addprefix build_, $(FLAVORS)); do \
		$(MAKE) -f debian/rules $$target || exit 1; done

build_0-pthread:
	$(MAKE) -C 0-pthread libs netlib shared $(MAKE_OPTIONS) $(FLAGS_0-pthread)
	$(MAKE) -C 0-pthread/interface shared-blas-lapack $(MAKE_OPTIONS) $(FLAGS_0-pthread)
build_64-0-pthread:
	$(MAKE) -C 64-0-pthread libs netlib shared $(MAKE_OPTIONS) $(FLAGS_64-0-pthread)
	$(MAKE) -C 64-0-pthread/interface shared-blas64-lapack64 $(MAKE_OPTIONS) $(FLAGS_64-0-pthread)
build_0-openmp:
	$(MAKE) -C 0-openmp libs netlib shared $(MAKE_OPTIONS) $(FLAGS_0-openmp)
	$(MAKE) -C 0-openmp/interface shared-blas-lapack $(MAKE_OPTIONS) $(FLAGS_0-openmp)
build_64-0-openmp:
	$(MAKE) -C 64-0-openmp libs netlib shared $(MAKE_OPTIONS) $(FLAGS_64-0-openmp)
	$(MAKE) -C 64-0-openmp/interface shared-blas64-lapack64 $(MAKE_OPTIONS) $(FLAGS_64-0-openmp)
build_0-serial:
	$(MAKE) -C 0-serial libs netlib shared $(MAKE_OPTIONS) $(FLAGS_0-serial)
	$(MAKE) -C 0-serial/interface shared-blas-lapack $(MAKE_OPTIONS) $(FLAGS_0-serial)
build_64-0-serial:
	$(MAKE) -C 64-0-serial libs netlib shared $(MAKE_OPTIONS) $(FLAGS_64-0-serial)
	$(MAKE) -C 64-0-serial/interface shared-blas64-lapack64 $(MAKE_OPTIONS) $(FLAGS_64-0-serial)
# XXX: why doesn't this work??
#build_%:
#   $(MAKE) -C $* $(MAKE_OPTIONS) $(FLAGS_$*)
#   $(MAKE) -C $*/interface $(MAKE_OPTIONS) $(FLAGS_$*)

override_dh_auto_test:
ifeq (,$(filter nocheck,$(DEB_BUILD_OPTIONS)))
	for target in $(addprefix test_, $(FLAVORS)); do \
		$(MAKE) -f debian/rules $$target || exit 1; done
endif

test_0-pthread:
	$(MAKE) -C 0-pthread tests $(MAKE_OPTIONS) $(FLAGS_0-pthread)
test_64-0-pthread:
	$(MAKE) -C 64-0-pthread tests $(MAKE_OPTIONS) $(FLAGS_64-0-pthread)
test_0-openmp:
	$(MAKE) -C 0-openmp tests $(MAKE_OPTIONS) $(FLAGS_0-openmp)
test_64-0-openmp:
	$(MAKE) -C 64-0-openmp tests $(MAKE_OPTIONS) $(FLAGS_64-0-openmp)
test_0-serial:
	$(MAKE) -C 0-serial tests $(MAKE_OPTIONS) $(FLAGS_0-serial)
test_64-0-serial:
	$(MAKE) -C 64-0-serial tests $(MAKE_OPTIONS) $(FLAGS_64-0-serial)
# XXX: why cannot this work?
#test_%:
#	$(MAKE) -C $* test $(MAKE_OPTIONS) $(FLAGS_$(*))

override_dh_auto_install:
	for target in $(addprefix install_, $(FLAVORS)); do \
		$(MAKE) -f debian/rules $$target || exit 1; done
	# change the inclusion for the 64-bit variant
	find debian/tmp -type f -path '*openblas64*' -exec sed -i -e 's/openblas_config.h/openblas64_config.h/g' '{}' \;

install_%:
	$(MAKE) -C $* install $(MAKE_OPTIONS) $(FLAGS_$*) \
		DESTDIR=../debian/tmp/ PREFIX=/usr \
		OPENBLAS_INCLUDE_DIR=/usr/include/$(DEB_HOST_MULTIARCH)/openblas$(subst $(SOVER)-,-,$(subst -$(SOVER)-,-,$*))/ \
		OPENBLAS_LIBRARY_DIR=/usr/lib/$(DEB_HOST_MULTIARCH)/openblas$(subst $(SOVER)-,-,$(subst -$(SOVER)-,-,$*))/
	# Fix the content of openblas.pc for 64-bit indexing
	if test -n "$$(echo $* | grep 64)"; then \
		sed -i -e "s/-lopenblas/-lopenblas64/" \
			-e "s/Name: openblas$$/Name: openblas64/" \
			debian/tmp/usr/lib/$(DEB_HOST_MULTIARCH)/openblas$(subst $(SOVER)-,-,$(subst -$(SOVER)-,-,$*))/pkgconfig/openblas.pc; \
	fi
	# Add blas-openblas.pc and lapack-openblas.pc
	for f in blas-openblas lapack-openblas; do \
		sed -e "s/@DEB_VERSION_UPSTREAM@/$(DEB_VERSION_UPSTREAM)/g" \
			-e "s/@DEB_HOST_MULTIARCH@/$(DEB_HOST_MULTIARCH)/g" \
			-e "s/@SUBDIR@/openblas$(subst $(SOVER)-,-,$(subst -$(SOVER)-,-,$*))/g" \
			-e "s/@INDEXING@/$$(echo $* | grep -o 64)/g" \
			< debian/$${f}.pc.in \
			> debian/tmp/usr/lib/$(DEB_HOST_MULTIARCH)/openblas$(subst $(SOVER)-,-,$(subst -$(SOVER)-,-,$*))/pkgconfig/$${f}.pc; \
	done

execute_after_dh_clean:
	for flavour in openmp pthread serial; do \
		rm -rf 0-$${flavour} 64-0-$${flavour}; \
		for i in install postinst prerm shlibs; do \
			rm -f debian/libopenblas-$${flavour}-dev.$$i \
				debian/libopenblas64-$${flavour}-dev.$$i \
				debian/libopenblas0-$${flavour}.$$i \
				debian/libopenblas64-0-$${flavour}.$$i; \
		done; \
		for i in links dirs; do \
			rm -f debian/libopenblas-$${flavour}-dev.$$i \
				debian/libopenblas64-$${flavour}-dev.$$i; \
		done; \
	done

# Needed to avoid a dependency on metapackage libopenblas0 from
# flavour-specific packages, since lib{blas,lapack}.so.3 is dynamically linked
# against libopenblas.so.0 (see #966607)
override_dh_shlibdeps:
	dh_shlibdeps -plibopenblas0-pthread -plibopenblas0-openmp -plibopenblas0-serial -- -xlibopenblas0
	dh_shlibdeps -plibopenblas64-0-pthread -plibopenblas64-0-openmp -plibopenblas64-0-serial -- -xlibopenblas64-0
	dh_shlibdeps --remaining-packages -a