# Copyright 1999-2009 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: /var/cvsroot/gentoo-x86/sci-libs/gsl/gsl-1.13-r1.ebuild,v 1.1 2009/09/20 18:45:49 alexxy Exp $

EAPI=2
inherit eutils flag-o-matic autotools

DESCRIPTION="The GNU Scientific Library"
HOMEPAGE="http://www.gnu.org/software/gsl/"
SRC_URI="mirror://gnu/${PN}/${P}.tar.gz"

LICENSE="GPL-3"
SLOT="0"
KEYWORDS="~alpha ~amd64 ~arm ~hppa ~ia64 ~mips ~ppc ~ppc64 ~s390 ~sh ~sparc ~x86 ~x86-fbsd"
IUSE="cblas"

RDEPEND="cblas? ( virtual/cblas )"
DEPEND="${RDEPEND}
	app-admin/eselect-cblas
	dev-util/pkgconfig"

pkg_setup() {
	ESELECT_PROF="gsl"
	# prevent to use external cblas from a previously installed gsl
	local current_lib=$(eselect cblas show | cut -d' ' -f2)
	if use cblas && [[ ${current_lib} == gsl ]]; then
		ewarn "USE flag cblas is set: linking gsl with an external cblas."
		ewarn "However the current selected external cblas is gsl."
		ewarn "Please install and/or eselect another cblas"
		die "Circular gsl dependency"
	fi
}

src_prepare() {
	filter-flags -ffast-math
	epatch "${FILESDIR}"/${P}-cblas.patch
	epatch "${FILESDIR}"/${P}-cblas-vars.patch
	eautoreconf
}

src_configure() {
	if use cblas; then
		export CBLAS_LIBS="$(pkg-config --libs cblas)"
		export CBLAS_CFLAGS="$(pkg-config --cflags cblas)"
	fi
	econf $(use_with cblas)
}

src_install() {
	emake install DESTDIR="${D}" || die "emake install failed."
	dodoc AUTHORS BUGS ChangeLog NEWS README THANKS TODO

	# take care of pkgconfig file for cblas implementation.
	sed -e "s/@LIBDIR@/$(get_libdir)/" \
		-e "s/@PV@/${PV}/" \
		"${FILESDIR}"/cblas.pc.in > cblas.pc \
		|| die "sed cblas.pc failed"
	insinto /usr/$(get_libdir)/blas/gsl
	doins cblas.pc || die "installing cblas.pc failed"
	eselect cblas add $(get_libdir) "${FILESDIR}"/eselect.cblas.gsl \
		${ESELECT_PROF}
}

pkg_postinst() {
	local p=cblas
	local current_lib=$(eselect ${p} show | cut -d' ' -f2)
	if [[ ${current_lib} == ${ESELECT_PROF} || -z ${current_lib} ]]; then
		# work around eselect bug #189942
		local configfile="${ROOT}"/etc/env.d/${p}/$(get_libdir)/config
		[[ -e ${configfile} ]] && rm -f ${configfile}
		eselect ${p} set ${ESELECT_PROF}
		elog "${p} has been eselected to ${ESELECT_PROF}"
	else
		elog "Current eselected ${p} is ${current_lib}"
		elog "To use ${p} ${ESELECT_PROF} implementation, you have to issue (as root):"
		elog "\t eselect ${p} set ${ESELECT_PROF}"
	fi
}