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# Copyright 1999-2014 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: $

EAPI=5

PYTHON_COMPAT=(  python2_7 )

inherit autotools-utils eutils flag-o-matic fortran-2 python-any-r1 toolchain-funcs

DESCRIPTION="A DFT electronic structure code using a wavelet basis set"
HOMEPAGE="http://bigdft.org/"
SRC_URI="http://launchpad.net/${PN}/${PV%.*}/${PV}/+download/${P}.tar.xz"

LICENSE="GPL-3"
SLOT="0"
KEYWORDS="~amd64 ~x86 ~amd64-linux"
IUSE="cuda doc etsf_io glib mpi netcdf openmp opencl scalapack test"

RDEPEND="
	>=sci-libs/libxc-1.2.0-r1[fortran]
	virtual/blas
	virtual/fortran
	virtual/lapack
	dev-libs/libyaml
	mpi? ( virtual/mpi )
	cuda? ( dev-util/nvidia-cuda-sdk )
	opencl? ( virtual/opencl )
	glib? ( >=dev-libs/glib-2.22 )
	etsf_io? ( >=sci-libs/etsf_io-1.0.3-r2 )
	netcdf? ( || (
				sci-libs/netcdf[fortran]
				sci-libs/netcdf-fortran
				)
			)
	scalapack? ( virtual/scalapack )"
DEPEND="${RDEPEND}
	virtual/pkgconfig
	>=sys-devel/autoconf-2.59
	doc? ( virtual/latex-base )
	${PYTHON_DEPS}
	dev-python/pyyaml[libyaml]
	dev-util/gdbus-codegen
	app-arch/tar
	app-arch/gzip"

DOCS=( README INSTALL ChangeLog AUTHORS NEWS )

FORTRAN_STANDARD=90

pkg_setup() {
	# fortran-2.eclass does not handle mpi wrappers
	if use mpi; then
		export FC="mpif90"
		export F77="mpif77"
		export CC="mpicc"
		export CXX="mpic++"
	else
		tc-export FC F77 CC CXX
	fi

	use openmp && FORTRAN_NEED_OPENMP=1

	fortran-2_pkg_setup

	if use openmp; then
		# based on _fortran-has-openmp() of fortran-2.eclass
		local openmp=""
		local fcode=ebuild-openmp-flags.f
		local _fc=$(tc-getFC)

		pushd "${T}"
		cat <<- EOF > "${fcode}"
		1     call omp_get_num_threads
		2     end
		EOF

		for openmp in -fopenmp -xopenmp -openmp -mp -omp -qsmp=omp; do
			"${_fc}" "${openmp}" "${fcode}" -o "${fcode}.x" && break
		done

		rm -f "${fcode}.*"
		popd

		append-flags "${openmp}"
	fi

	python-any-r1_pkg_setup
}

src_prepare() {
	epatch \
		"${FILESDIR}"/"${P}"-pkgconfig.patch \
		"${FILESDIR}"/"${P}"-dynamic_memory.patch

	eautoreconf
}

src_configure() {
	local modules="${EPREFIX}/usr/include"
	local netcdff_libs="-lnetcdff"
	filter-flags '-m*' '-O*' "-pipe"
	local nvcflags="${CFLAGS}"
	_filter-var nvcflags '-m*' '-O*' "-pipe" "-W*"
	use cuda && filter-ldflags '-m*' '-O*' "-pipe" "-W*"
	local mylapack="lapack"
	use scalapack && mylapack="scalapack"
	local myeconfargs=(
		$(use_enable mpi)
		--enable-optimised-convolution
		--enable-pseudo
		--enable-libbigdft
		--enable-binaries
		--disable-bindings
		--disable-minima-hopping
		--disable-internal-libyaml
		--enable-internal-libabinit
		--with-moduledir="${modules}"
		--with-ext-linalg="$($(tc-getPKG_CONFIG) --libs-only-l "${mylapack}")"
		--with-ext-linalg-path="$($(tc-getPKG_CONFIG) --libs-only-L "${mylapack}")"
		--with-libxc="yes"
		--disable-internal-libxc
		$(use_enable cuda cuda-gpu)
		$(use_with cuda cuda-path /opt/cuda)
		$(use_with cuda nvcc-flags "${nvcflags}")
		$(use_enable opencl)
		$(use_with etsf_io etsf-io)
		"$(use etsf_io && echo "--with-netcdf-libs=$($(tc-getPKG_CONFIG) --libs netcdf) ${netcdff_libs}")"
		$(use_with glib gobject)
		$(use_with scalapack)
		$(use_with scalapack scalapack-path "${EPREFIX}/usr/$(get_libdir)")
		$(use_with scalapack blacs)
		$(use_with scalapack blacs-path "${EPREFIX}/usr/$(get_libdir)")
		PKG_CONFIG="$(tc-getPKG_CONFIG)"
		FCFLAGS="${FCFLAGS} -I${modules}"
		LD="$(tc-getLD)"
		CPP="$(tc-getCPP)"
		)
	autotools-utils_src_configure
}

src_compile() {
	#autotools-utils_src_compile() expanded
	_check_build_dir
	pushd "${AUTOTOOLS_BUILD_DIR}" > /dev/null
	emake -j1
	sed -i -e's%\$(top_builddir)/[^ ]*/lib\([^ /$-]*\)\.a%-l\1%g' bigdft.pc
	popd > /dev/null

	#autotools-utils_src_compile
	if use doc; then
		VARTEXFONTS="${T}/fonts"
		autotools-utils_src_compile doc
	fi
}

src_test() {
	if use test; then
		#autotools-utils_src_test() expanded
		_check_build_dir
		pushd "${BUILD_DIR}" > /dev/null || die
		# Run default src_test as defined in ebuild.sh
		cd tests
		emake -j1 check
		popd > /dev/null
	fi
}

src_install() {
	autotools-utils_src_install
	if use test; then
		_check_build_dir
		pushd "${BUILD_DIR}" > /dev/null || die
		insinto /usr/share/"${P}"
		doins -r tests
		popd > /dev/null
	fi
}