#!/usr/bin/make -f

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

MAKE_OPTIONS := NO_LAPACKE=1 NO_AFFINITY=1 USE_OPENMP=0 NO_WARMUP=1 CFLAGS="$(CPPFLAGS) $(CFLAGS)" FFLAGS="$(FFLAGS)"

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

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

# On x86 and arm64 archs, enable dynamic arch selection
# TARGET=GENERIC is needed to avoid FTBFS when CPU detectin fails (see #923607)
ENABLE_DYNAMIC_ARCHS := amd64 arm64 i386 kfreebsd-amd64 kfreebsd-i386
ifneq (,$(findstring $(DEB_HOST_ARCH),$(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.
ifeq ($(DEB_HOST_ARCH),armhf)
	GENERIC_OPTIONS += TARGET=ARMV6
endif

ifeq ($(DEB_HOST_ARCH),powerpc)
	GENERIC_OPTIONS += TARGET=PPCG4
endif

ifeq ($(DEB_HOST_ARCH),mips64el)
	GENERIC_OPTIONS += TARGET=SICORTEX
endif

# POWER6 is the most generic arch that compiles on ppc64
ifeq ($(DEB_HOST_ARCH),ppc64)
	GENERIC_OPTIONS += TARGET=POWER6
endif

ifeq ($(DEB_HOST_ARCH),ppc64el)
	GENERIC_OPTIONS += TARGET=POWER8
endif

ifeq ($(DEB_HOST_ARCH),sparc64)
	GENERIC_OPTIONS += TARGET=SPARC
endif

ifeq ($(DEB_HOST_ARCH),s390x)
	GENERIC_OPTIONS += TARGET=ZARCH_GENERIC
endif


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


%:
	dh $@

override_dh_auto_build:
	$(MAKE) $(MAKE_OPTIONS)

	$(MAKE) -C interface shared-blas-lapack $(MAKE_OPTIONS)

override_dh_auto_install:
	$(MAKE) install $(MAKE_OPTIONS) DESTDIR=debian/tmp/ PREFIX=/usr OPENBLAS_INCLUDE_DIR=/usr/include/$(DEB_HOST_MULTIARCH) OPENBLAS_LIBRARY_DIR=/usr/lib/$(DEB_HOST_MULTIARCH)
	mv debian/tmp/usr/include/$(DEB_HOST_MULTIARCH)/cblas.h debian/tmp/usr/include/$(DEB_HOST_MULTIARCH)/cblas-openblas.h

# We want packages linked with -lblas to depend on any BLAS alternative, and we
# want packages linked with -lopenblas to depend specifically on
# libopenblas-base.
#
# Such a setting is not supported by dh_makeshlibs, so we ship a hand-crafted
# shlibs file.
override_dh_makeshlibs:
	dh_makeshlibs
	cp debian/libopenblas-base.shlibs debian/libopenblas-base/DEBIAN/shlibs

GENERATED_DEBIAN_FILES := $(patsubst %.in,%,$(wildcard debian/*.pc.in debian/*.postinst.in debian/*.prerm.in))

$(GENERATED_DEBIAN_FILES): %: %.in
	sed -e "s/@DEB_VERSION_UPSTREAM@/$(DEB_VERSION_UPSTREAM)/g" \
	    -e "s/@DEB_HOST_MULTIARCH@/$(DEB_HOST_MULTIARCH)/g" < $< > $@

override_dh_install: $(GENERATED_DEBIAN_FILES)
	dh_install

override_dh_clean:
	dh_clean
	rm -f $(GENERATED_DEBIAN_FILES)