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# Copyright 1999-2021 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

EAPI=7

inherit fortran-2 flag-o-matic toolchain-funcs

MYP=MUMPS_${PV}

DESCRIPTION="MUltifrontal Massively Parallel sparse direct matrix Solver"
HOMEPAGE="http://mumps.enseeiht.fr/"
SRC_URI="http://mumps.enseeiht.fr/${MYP}.tar.gz"
S="${WORKDIR}/${MYP}"

LICENSE="public-domain"
SLOT="0"
KEYWORDS="~amd64 ~x86 ~amd64-linux ~x86-linux"
IUSE="doc examples metis mpi +scotch static-libs"

BDEPEND="virtual/pkgconfig"
RDEPEND="
	virtual/blas
	metis? (
		   || ( >=sci-libs/metis-5 >=sci-libs/parmetis-4 )
		   mpi? ( >=sci-libs/parmetis-4 )
	)
	mpi? ( sci-libs/scalapack )
	scotch? ( >=sci-libs/scotch-6.0.1:=[mpi=] )
"
DEPEND="${RDEPEND}"

get_version_component_count() {
	local cnt=( $(ver_rs 1- ' ') )
	echo ${#cnt[@]} || die
}

static_to_shared() {
	local libstatic=${1}
	shift
	local libname=$(basename ${libstatic%.a})
	local soname=${libname}$(get_libname $(ver_cut 1-2))
	local libdir=$(dirname ${libstatic})

	einfo "Making ${soname} from ${libstatic}"
	if [[ ${CHOST} == *-darwin* ]] ; then
		${LINK:-$(tc-getCC)} ${LDFLAGS}  \
			-dynamiclib -install_name "${EPREFIX}"/usr/lib/"${soname}" \
			-Wl,-all_load -Wl,${libstatic} \
			"$@" -o ${libdir}/${soname} || die "${soname} failed"
	else
		${LINK:-$(tc-getCC)} ${LDFLAGS}  \
			-shared -Wl,-soname=${soname} \
			-Wl,--whole-archive ${libstatic} -Wl,--no-whole-archive \
			"$@" -o ${libdir}/${soname} || die "${soname} failed"

		if [[ $(get_version_component_count) -ge 1 ]] ; then
			ln -s ${soname} ${libdir}/${libname}$(get_libname $(ver_cut 1)) || die
		fi

		ln -s ${soname} ${libdir}/${libname}$(get_libname) || die
	fi
}

src_prepare() {
	# workaround for gcc10 (bug #743442)
	append-fflags $(test-flags-FC -fallow-argument-mismatch)

	sed -e "s;^\(CC\s*=\).*;\1$(tc-getCC);" \
		-e "s;^\(FC\s*=\).*;\1$(tc-getFC);" \
		-e "s;^\(FL\s*=\).*;\1$(tc-getFC);" \
		-e "s;^\(AR\s*=\).*;\1$(tc-getAR) cr ;" \
		-e "s;^\(RANLIB\s*=\).*;\1$(tc-getRANLIB);" \
		-e "s;^\(LIBBLAS\s*=\).*;\1$($(tc-getPKG_CONFIG) --libs blas);" \
		-e "s;^\(INCPAR\s*=\).*;\1;" \
		-e 's;^\(LIBPAR\s*=\).*;\1$(SCALAP);' \
		-e "s;^\(OPTF\s*=\).*;\1${FFLAGS} -DALLOW_NON_INIT \$(PIC);" \
		-e "s;^\(OPTC\s*=\).*;\1${CFLAGS} \$(PIC);" \
		-e "s;^\(OPTL\s*=\).*;\1${LDFLAGS};" \
		Make.inc/Makefile.inc.generic > Makefile.inc || die
	# fixed a missing copy of libseq to libdir

	default
}

src_configure() {
	LIBADD="$($(tc-getPKG_CONFIG) --libs blas) -Llib -lpord"
	local ord="-Dpord"

	if use metis && use mpi; then
		sed -i \
			-e "s;#\s*\(LMETIS\s*=\).*;\1$($(tc-getPKG_CONFIG) --libs parmetis);" \
			-e "s;#\s*\(IMETIS\s*=\).*;\1$($(tc-getPKG_CONFIG) --cflags parmetis);" \
			Makefile.inc || die
		LIBADD="${LIBADD} $($(tc-getPKG_CONFIG) --libs parmetis)"
		ord="${ord} -Dparmetis"
	elif use metis; then
		sed -i \
			-e "s;#\s*\(LMETIS\s*=\).*;\1$($(tc-getPKG_CONFIG) --libs metis);" \
			-e "s;#\s*\(IMETIS\s*=\).*;\1$($(tc-getPKG_CONFIG) --cflags metis);" \
			Makefile.inc || die
		LIBADD="${LIBADD} $($(tc-getPKG_CONFIG) --libs metis)"
		ord="${ord} -Dmetis"
	fi
	if use scotch && use mpi; then
		sed -i \
			-e "s;#\s*\(LSCOTCH\s*=\).*;\1-lptesmumps -lptscotch -lptscotcherr;" \
			-e "s;#\s*\(ISCOTCH\s*=\).*;\1-I${ESYSROOT}/usr/include/scotch;" \
			Makefile.inc || die
		LIBADD="${LIBADD} -lptesmumps -lptscotch -lptscotcherr"
		ord="${ord} -Dptscotch"
	elif use scotch; then
		sed -i \
			-e "s;#\s*\(LSCOTCH\s*=\).*;\1-lesmumps -lscotch -lscotcherr;" \
			-e "s;#\s*\(ISCOTCH\s*=\).*;\1-I${ESYSROOT}/usr/include/scotch;" \
			Makefile.inc || die
		LIBADD="${LIBADD} -lesmumps -lscotch -lscotcherr"
		ord="${ord} -Dscotch"
	fi
	if use mpi; then
		sed -i \
			-e "s;^\(CC\s*=\).*;\1mpicc;" \
			-e "s;^\(FC\s*=\).*;\1mpif90;" \
			-e "s;^\(FL\s*=\).*;\1mpif90;" \
			-e "s;^\(SCALAP\s*=\).*;\1$($(tc-getPKG_CONFIG) --libs scalapack);" \
			Makefile.inc || die
		export LINK=mpif90
		LIBADD="${LIBADD} $($(tc-getPKG_CONFIG) --libs scalapack)"
	else
		sed -i \
			-e 's;-Llibseq;-L$(topdir)/libseq;' \
			-e 's;PAR);SEQ);g' \
			-e "s;^\(SCALAP\s*=\).*;\1;" \
			-e 's;^LIBSEQNEEDED =;LIBSEQNEEDED = libseqneeded;g' \
			Makefile.inc || die
		export LINK="$(tc-getFC)"
	fi
	sed -i -e "s;^\s*\(ORDERINGSF\s*=\).*;\1 ${ord};" Makefile.inc || die
}

src_compile() {
	# Workaround #462602
	export FAKEROOTKEY=1

	emake alllib PIC="-fPIC"
	if ! use mpi; then
		#$(tc-getAR) crs lib/libmumps_common.a libseq/*.o || die
		LIBADD+=" -Llibseq -lmpiseq"
		static_to_shared libseq/libmpiseq.a
	fi

	static_to_shared lib/libpord.a ${LIBADD}
	static_to_shared lib/libmumps_common.a ${LIBADD}

	local i
	for i in c d s z; do
		static_to_shared lib/lib${i}mumps.a -Llib -lmumps_common ${LIBADD}
	done

	if use static-libs; then
		emake clean
		emake alllib
	fi
}

src_test() {
	emake all

	local dotest
	if use mpi; then
		dotest="mpirun -np 2"
	else
		export LD_LIBRARY_PATH="${S}/libseq:${LD_LIBRARY_PATH}"
	fi

	cd examples
	${dotest} ./ssimpletest < input_simpletest_real || die
	${dotest} ./dsimpletest < input_simpletest_real || die
	${dotest} ./csimpletest < input_simpletest_cmplx || die
	${dotest} ./zsimpletest < input_simpletest_cmplx || die
	einfo "The solutions should be close to (1,2,3,4,5)"
	${dotest} ./c_example || die
	einfo "The solution should be close to (1,2)"
	emake clean
}

src_install() {
	dolib.so lib/lib*$(get_libname)*
	use static-libs && dolib.a lib/lib*.a
	insinto /usr

	doins -r include
	if ! use mpi; then
		dolib.so libseq/lib*$(get_libname)*
		insinto /usr/include/mpiseq
		doins libseq/*.h
		use static-libs && dolib.a libseq/libmpiseq.a
	fi

	dodoc README ChangeLog VERSION
	use doc && dodoc doc/*.pdf
	if use examples; then
		dodoc -r examples
	fi
}