# Contributor: Isaac Dunham <ibid.ag@gmail.com>
# Contributor: Jakub Jirutka <jakub@jirutka.cz>
# Maintainer:
pkgname=openblas
_pkgname=OpenBLAS
pkgver=0.3.23
pkgrel=1
pkgdesc="fast BSD-licensed BLAS based on gotoBLAS2, with LAPACK"
url="https://www.openblas.net/"
arch="all"
license="BSD-3-Clause"
depends_dev="gfortran"
makedepends="$depends_dev perl linux-headers"
subpackages="
	$pkgname-dev
	$pkgname-doc
	liblapack
	liblapacke
	"
source="https://github.com/xianyi/$_pkgname/archive/v$pkgver/openblas-$pkgver.tar.gz
	separate-tests.patch
	blas-lapack.patch
	"
builddir="$srcdir/$_pkgname-$pkgver"
_builddir64="$builddir-64"

# this provides mostly the same thing as community/lapack,
# but they should be separate
sonameprefix="$pkgname:"

# ILP64 is not supported on aarch64 (https://github.com/xianyi/OpenBLAS/issues/956)
_ilp64=false
if [ "$CARCH" = "x86_64" ]; then
	subpackages="$subpackages $pkgname-ilp64"
	_ilp64=true
fi

# USE_OPENMP=0: see GCC bug 60035
# NO_AFFINITY: don't expect to work on musl, also breaks R and not
#              recommended for Julia
# NO_STATIC: this is absolutely massive and not used anywhere in aports
_flags="
	MAJOR_VERSION=3
	NO_AFFINITY=1
	NO_STATIC=1
	USE_OPENMP=0
	PREFIX=/usr
	"
case "$CARCH" in
ppc64le)
	# POWER machines are big and have 4/8 way SMT
	_flags="$_flags NUM_THREADS=64"
	;;
*64|s390x)
	# match kernel's CONFIG_NR_CPUS
	_flags="$_flags NUM_THREADS=256"
	;;
*)
	# 32bit machines usually have fewer cores
	_flags="$_flags NUM_THREADS=8"
	;;
esac

case "$CARCH" in
x86*)
	# DYNAMIC_ARCH is supported on x86* only, see
	# https://github.com/xianyi/OpenBLAS/issues/709
	_flags="$_flags DYNAMIC_ARCH=1"
	;;
*)
	_flags="$_flags DYNAMIC_ARCH=0"
	;;
esac

case "$CARCH" in
x86*)
	_flags="$_flags TARGET=CORE2"
	;;
armhf)
	_flags="$_flags TARGET=ARMV6"
	;;
armv7)
	_flags="$_flags TARGET=ARMV7"
	;;
aarch64)
	_flags="$_flags TARGET=ARMV8"
	;;
ppc64le)
	_flags="$_flags TARGET=POWER8"
	;;
s390x)
	_flags="$_flags TARGET=ZARCH_GENERIC"
	;;
riscv64)
	_flags="$_flags TARGET=RISCV64_GENERIC"
	;;
esac

# Flags for ILP64 variant.
_flags64="
	$_flags
	INTERFACE64=1
	SYMBOLSUFFIX=64_
	"

prepare() {
	default_prepare

	if [ "$CARCH" = "ppc64le" ] ; then
		# Skip test level 3 on ppc64le for a while
		sed 's/level2 level3/level2/g' -i "$builddir"/test/Makefile
		sed 's/all2 all3/all2/g' -i "$builddir"/ctest/Makefile
	fi
	cp -ar "$builddir" "$_builddir64"
}

build() {
	# OpenBLAS library is huge and it's heavily optimized for performance.
	# It doesn't make sense to compile it with -Os.
	export CFLAGS=${CFLAGS/-Os/-O2}

	make -C "$builddir" \
		$_flags CFLAGS="$CFLAGS"
	make -C "$builddir"/interface \
		$_flags CFLAGS="$CFLAGS" shared-blas-lapack

	if $_ilp64; then
		msg "Building with ILP64..."
		make -C "$_builddir64" $_flags64 CFLAGS="$CFLAGS"
	fi
}

dev() {
	provides="blas-dev lapack-dev"
	replaces="$provides"

	default_dev
}

check() {
	make -j1 $_flags CFLAGS="$CFLAGS" tests
}

package() {
	if $_ilp64; then
		make -C "$_builddir64" $_flags64 DESTDIR="$pkgdir" install
	fi

	make $_flags DESTDIR="$pkgdir" install
	install -Dm755 interface/liblapack.so.3 \
		"$pkgdir"/usr/lib/liblapack.so.3
	ln -s liblapack.so.3 "$pkgdir"/usr/lib/liblapack.so
	install -Dm755 interface/liblapacke.so.3 \
		"$pkgdir"/usr/lib/liblapacke.so.3
	ln -s liblapacke.so.3 "$pkgdir"/usr/lib/liblapacke.so

	install -Dm 0644 Changelog.txt TargetList.txt USAGE.md \
		-t "$pkgdir"/usr/share/doc/$pkgname/
}

ilp64() {
	pkgdesc="$pkgdesc (ILP64)"

	amove usr/lib/libopenblas64_*
}

liblapack() {
	pkgdesc="$pkgdesc (LAPACK library)"
	# provides the same library
	depends="!lapack"
	amove usr/lib/liblapack.so.*
}

liblapacke() {
	pkgdesc="$pkgdesc (LAPACKE library)"
	# provides the same library
	depends="!lapack"
	amove usr/lib/liblapacke.so.*
}

sha512sums="
ea64c693e57eb63cc2a88e4d6ab2d8cf9ab84ae6a15048fb12090a3570dd41053e62e99c1ff9d3e02dd67ca93233591ab41b8c017d06585d0a69222e1ad3023f  openblas-0.3.23.tar.gz
de2769ba6d1adcb31e19732c6c4a9f39dc1745932b954106a8037a4dfa98d77a468bd414abadab0d72bbbabf17f86748fb9297051c937fd6eae3d375aa5f5ad7  separate-tests.patch
a0540d1bc3cc596725234f9caaeaf59522ed75b02614713c1d4a536d78a0e79c132a0f39dd6f7c90d79daebe6a03a953ccf7c56d5ab059d6677eab533f5f304f  blas-lapack.patch
"