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# Copyright 1999-2015 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Id$

EAPI=5

CMAKE_IN_SOURCE_BUILD=1

inherit cmake-utils toolchain-funcs multilib eutils

DESCRIPTION="Streamlined C++ linear algebra library"
HOMEPAGE="http://arma.sourceforge.net/"
SRC_URI="mirror://sourceforge/arma/${P}.tar.gz"

LICENSE="MPL-2.0"
SLOT="0/6"
KEYWORDS="~amd64 ~x86 ~amd64-linux ~x86-linux"
IUSE="arpack atlas blas debug doc examples hdf5 lapack mkl superlu tbb test"
REQUIRED_USE="test? ( lapack )"

RDEPEND="
	dev-libs/boost
	arpack? ( sci-libs/arpack )
	atlas? ( sci-libs/atlas[lapack] )
	blas? ( virtual/blas )
	lapack? ( virtual/lapack )
	superlu? ( sci-libs/superlu )
"
DEPEND="${RDEPEND}
	arpack? ( virtual/pkgconfig )
	atlas? ( virtual/pkgconfig )
	blas? ( virtual/pkgconfig )
	hdf5? ( sci-libs/hdf5 )
	lapack? ( virtual/pkgconfig )
	mkl? ( sci-libs/mkl )
	tbb? ( dev-cpp/tbb )"
PDEPEND="${RDEPEND}
	hdf5? ( sci-libs/hdf5 )
	mkl? ( sci-libs/mkl )
	tbb? ( dev-cpp/tbb )"

src_prepare() {
	# avoid the automagic cmake macros
	sed -i -e '/ARMA_Find/d' CMakeLists.txt || die
	cmake-utils_src_prepare
}

src_configure() {
	local mycmakeargs=(
		-DINSTALL_LIB_DIR="${EPREFIX}/usr/$(get_libdir)"
		$(cmake-utils_use debug ARMA_EXTRA_DEBUG)
		$(cmake-utils_use mkl ARMA_USE_MKL_ALLOC)
		$(cmake-utils_use tbb ARMA_USE_TBB_ALLOC)
	)
	if use arpack; then
		mycmakeargs+=(
			-DARPACK_FOUND=ON
			-DARPACK_LIBRARY="$($(tc-getPKG_CONFIG) --libs arpack)"
		)
	fi
	if use atlas; then
		local c=atlas-cblas l=atlas-clapack
		$(tc-getPKG_CONFIG) --exists ${c}-threads && c+=-threads
		$(tc-getPKG_CONFIG) --exists ${l}-threads && l+=-threads
		mycmakeargs+=(
			-DCBLAS_FOUND=ON
			-DCBLAS_INCLUDE_DIR="$($(tc-getPKG_CONFIG) --cflags-only-I ${c} | sed 's/-I//')"
			-DCBLAS_LIBRARIES="$($(tc-getPKG_CONFIG) --libs ${c})"
			-DCLAPACK_FOUND=ON
			-DCLAPACK_INCLUDE_DIR="$($(tc-getPKG_CONFIG) --cflags-only-I ${l} | sed 's/-I//')"
			-DCLAPACK_LIBRARIES="$($(tc-getPKG_CONFIG) --libs ${l})"
		)
	fi
	if use blas; then
		mycmakeargs+=(
			-DBLAS_FOUND=ON
			-DBLAS_LIBRARIES="$($(tc-getPKG_CONFIG) --libs blas)"
		)
	fi
	if use hdf5; then
		mycmakeargs+=(
			-DHDF5_FOUND=ON
			-DHDF5_LIBRARIES="-lhdf5"
		)
	fi
	if use lapack; then
		mycmakeargs+=(
			-DLAPACK_FOUND=ON
			-DLAPACK_LIBRARIES="$($(tc-getPKG_CONFIG) --libs lapack)"
		)
	fi
	if use superlu; then
		mycmakeargs+=(
			-DSuperLU_FOUND=ON
			-DSuperLU_LIBRARIES="$($(tc-getPKG_CONFIG) --libs superlu)"
			-DSuperLU_INCLUDE_DIR="$($(tc-getPKG_CONFIG) --cflags-only-I superlu | awk '{print $1}' | sed 's/-I//')"
		)
	fi

	cmake-utils_src_configure
}

src_test() {
	pushd examples > /dev/null
	emake \
		CXXFLAGS="-I../include ${CXXFLAGS} -DARMA_USE_BLAS -DARMA_USE_LAPACK" \
		EXTRA_LIB_FLAGS="-L.. $($(tc-getPKG_CONFIG) --libs blas lapack)"
	LD_LIBRARY_PATH="..:${LD_LIBRARY_PATH}" ./example1 || die
	LD_LIBRARY_PATH="..:${LD_LIBRARY_PATH}" ./example2 || die
	emake clean
	popd > /dev/null
}

src_install() {
	cmake-utils_src_install
	dodoc README.txt
	use doc && dodoc *pdf && dohtml *html
	if use examples; then
		insinto /usr/share/examples/${PF}
		doins -r examples/*
	fi
}