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# Copyright 1999-2016 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Id$

EAPI=6

FORTRAN_NEEDED=fortran
FORTRAN_STANDARD="77 90"

inherit fortran-2 multilib-minimal mpi

MY_PV=${PV/_/}
DESCRIPTION="A high performance and portable MPI implementation"
HOMEPAGE="http://www.mpich.org/"
SRC_URI="http://www.mpich.org/static/downloads/${PV}/${P}.tar.gz"

SLOT="0"
LICENSE="mpich"
KEYWORDS="~amd64 ~hppa ~ppc ~ppc64 ~x86 ~amd64-linux ~x86-linux"
IUSE="+cxx doc fortran mpi-threads romio threads"

COMMON_DEPEND="
	>=dev-libs/libaio-0.3.109-r5[${MULTILIB_USEDEP}]
	>=sys-apps/hwloc-1.10.0-r2[${MULTILIB_USEDEP}]
	romio? ( net-fs/nfs-utils )
	$(mpi_imp_deplist)"

DEPEND="${COMMON_DEPEND}
	dev-lang/perl
	sys-devel/libtool"

RDEPEND="${COMMON_DEPEND}"

S="${WORKDIR}"/${PN}-${MY_PV}

MULTILIB_WRAPPED_HEADERS=(
	/usr/include/mpicxx.h
	/usr/include/mpi.h
	/usr/include/opa_config.h
)

src_prepare() {
	default

	# Using MPICHLIB_LDFLAGS doesn't seem to fully work.
	sed -i 's| *@WRAPPER_LDFLAGS@ *||' \
		src/packaging/pkgconfig/mpich.pc.in \
		src/env/*.in \
		|| die
}

multilib_src_configure() {
	# The configure statements can be somewhat confusing, as they
	# don't all show up in the top level configure, however, they
	# are picked up in the children directories.  Hence the separate
	# local vars.

	local c=
	if use mpi-threads; then
		# MPI-THREAD requries threading.
		c="${c} --with-thread-package=pthreads"
		c="${c} --enable-threads=runtime"
	else
		if use threads ; then
			c="${c} --with-thread-package=pthreads"
		else
			c="${c} --with-thread-package=none"
		fi
		c="${c} --enable-threads=single"
	fi

	if ! mpi_classed; then
		c="${c} --sysconfdir=${EPREFIX}/etc/${PN}"
		c="${c} --docdir=${EPREFIX}/usr/share/doc/${PF}"
	else
		c="${c} --docdir=$(mpi_root)/usr/share/doc/${PF}"
	fi

	export MPICHLIB_CFLAGS="${CFLAGS}"
	export MPICHLIB_CPPFLAGS="${CPPFLAGS}"
	export MPICHLIB_CXXFLAGS="${CXXFLAGS}"
	export MPICHLIB_FFLAGS="${FFLAGS}"
	export MPICHLIB_FCFLAGS="${FCFLAGS}"
	export MPICHLIB_LDFLAGS="${LDFLAGS}"
	unset CFLAGS CPPFLAGS CXXFLAGS FFLAGS FCFLAGS LDFLAGS

	ECONF_SOURCE=${S} econf $(mpi_econf_args) \
		--enable-shared \
		--with-hwloc-prefix="${EPREFIX}/usr" \
		${c} \
		--with-pm=hydra \
		--disable-fast \
		--enable-versioning \
		--with-hwloc-prefix=/usr \
		$(use_enable romio) \
		$(use_enable cxx) \
		$(multilib_native_use_enable fortran fortran all)
}

multilib_src_test() {
	emake -j1 check
}

multilib_src_install() {
	default

	# fortran header cannot be wrapped (bug #540508), workaround part 1
	if multilib_is_native_abi && use fortran; then
		mkdir "${T}"/fortran || die
		mv "${ED}"/$(mpi_root)/usr/include/mpif* "${T}"/fortran || die
		mv "${ED}"/$(mpi_root)/usr/include/*.mod "${T}"/fortran || die
	else
		# some fortran files get installed unconditionally
		rm "${ED}"/$(mpi_root)/usr/include/mpif* "${ED}"usr/include/*.mod || die
	fi
}

multilib_src_install_all() {
	# fortran header cannot be wrapped (bug #540508), workaround part 2
	if use fortran; then
		mv "${T}"/fortran/* "${ED}"/$(mpi_root)/usr/include || die
	fi

	mpi_dodir /usr/share/doc/${PF}
	mpi_dodoc COPYRIGHT README{,.envvar} CHANGES RELEASE_NOTES
	mpi_newdoc src/pm/hydra/README README.hydra
	if use romio; then
		mpi_newdoc src/mpi/romio/README README.romio
	fi

	local d=$(echo ${ED}/$(mpi_root)/ | sed 's,///*,/,g')
	if ! use doc; then
		rm -rf "${d}"usr/share/doc/${PF}/www* || die
	fi

	MPI_ESELECT_FILE="eselect.mpi.mpich"
	mpi_imp_add_eselect
}