# Copyright 1999-2006 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: $

inherit eutils flag-o-matic toolchain-funcs fortran

DESCRIPTION="Full LAPACK implementation using available ATLAS routines"
LICENSE="BSD"
HOMEPAGE="http://math-atlas.sourceforge.net/"
MY_PN="${PN/lapack-/}"
SRC_URI1="mirror://sourceforge/math-atlas/${MY_PN}${PV}.tar.bz2"
SRC_URI2="http://www.netlib.org/lapack/lapack.tgz"
SRC_URI="${SRC_URI1} ${SRC_URI2}
	mirror://gentoo/lapack-20020531-20021004.patch.bz2
	mirror://gentoo/${MY_PN}-${PV}-shared-libs.patch.bz2"

SLOT="0"
IUSE="doc"
KEYWORDS="~alpha ~amd64 ~ia64 ~ppc ~ppc64 ~sparc ~x86"

RDEPEND="app-admin/eselect-lapack
	virtual/blas"
DEPEND="${RDEPEND}
	>=sys-devel/libtool-1.5
	~sci-libs/blas-atlas-3.7.15"
PROVIDE="virtual/lapack"

FORTRAN="g77 gfortran"

S="${WORKDIR}/ATLAS"
S_LAPACK="${WORKDIR}/LAPACK"
BLD_DIR="${S}/gentoo-build"
RPATH="${DESTTREE}/$(get_libdir)/lapack/atlas"

pkg_setup() {
	fortran_pkg_setup
	echo
	ewarn "Please make sure to disable CPU throttling completely"
	ewarn "during the compile of lapack-atlas. Otherwise, all atlas"
	ewarn "generated timings will be completely random and the"
	ewarn "performance of the resulting libraries will be degraded"
	ewarn "considerably."
	echo
}

src_unpack() {
	unpack ${A}

	epatch "${FILESDIR}"/${MY_PN}-${PV}-shared-libs.patch
	epatch "${DISTDIR}"/lapack-20020531-20021004.patch.bz2
	epatch "${FILESDIR}"/lapack-reference-3.0-autotool.patch

	cd "${S}"
	# make sure shared libs link against proper libraries
	if [[ ${FORTRANC} == "gfortran" ]]; then
		libs="${LDFLAGS} -lpthread -lgfortran"
	else
		libs="${LDFLAGS} -lpthread -lg2c"
	fi
	sed -e "s/SHRD_LNK/${libs}/g" -i "${S}"/Make.top || \
		die "Failed to add addtional libs to shared object build"

	mkdir ${BLD_DIR}  || die "failed to generate build directory"
	cp "${FILESDIR}"/war "${BLD_DIR}" && chmod a+x "${BLD_DIR}"/war || \
		die "failed to install war"

	cd "${BLD_DIR}" && ../configure -Si cputhrchk 0 \
		|| die "configure failed"

	sed -e "s:GENTOO_GCC:$(tc-getCC):" \
		-e "s:GENTOO_FORTRAN:${FORTRANC}:" \
		-e "s:GENTOO_CFLAGS:${CFLAGS}:" \
		-e "s:GENTOO_FFLAGS:${FFLAGS}:" \
		-e "s: LAPACKlib =: LAPACKlib = \$(LIBdir)/liblapack.a:" \
		-e "s: INCLUDES =: INCLUDES = -I/usr/include/atlas :" \
		-i Make.inc || die "Failed to fix Make.inc"

	cd "${S_LAPACK}"
	eautoreconf
}

src_compile() {
	cd "${BLD_DIR}"/src/lapack
	make lib || die "Failed to make lib in ${BLD_DIR}/src/lapack"
	cd "${BLD_DIR}"/interfaces/lapack/C/src
	make lib || die "Failed to make lib in ${BLD_DIR}/interfaces/lapack/C/src"
	cd "${BLD_DIR}"/interfaces/lapack/F77/src
	make lib || die "Failed to make lib in ${BLD_DIR}/interfaces/lapack/F77/src"

	cd "${S_LAPACK}"
	econf || die "Failed to configure reference lapack lib"
	emake || die "Failed to make reference lapack lib"

	cd "${S_LAPACK}"/SRC
	einfo "Copying liblapack.a/*.o to ${S_LAPACK}/SRC"
	cp -sf "${BLD_DIR}"/gentoo/liblapack.a/*.o .
	einfo "Copying liblapack.a/*.lo to ${S_LAPACK}/SRC"
	cp -sf "${BLD_DIR}"/gentoo/liblapack.a/*.lo .
	einfo "Copying liblapack.a/.libs/*.o to ${S_LAPACK}/SRC"
	cp -sf "${BLD_DIR}"/gentoo/liblapack.a/.libs/*.o .libs/

	# make sure shared libs link against proper libraries
	if [[ ${FORTRANC} == "gfortran" ]]; then
		FLIBS="-lpthread -lgfortran"
	else
		FLIBS="-lpthread -lg2c"
	fi

	libtool --mode=link --tag=F77 ${FORTRANC} -o liblapack.la *.lo \
		-rpath "${RPATH}" -lblas -lcblas -latlas ${FORTRANLIB} \
		|| die "Failed to create liblapack.la"
}

src_install () {
	dodir "${RPATH}"

	cd "${S_LAPACK}"/SRC
	libtool --mode=install install -s liblapack.la "${D}/${RPATH}" \
		|| die "Failed to install lapack-atlas library"

	eselect lapack add $(get_libdir) ${FILESDIR}/eselect.lapack atlas

	insinto /usr/include/atlas
	cd "${S}"/include
	doins clapack.h || die

	cd "${S}"
	dodoc README || die
	cd "${S}"/doc
	dodoc AtlasCredits.txt ChangeLog || die
	if use doc; then
		dodoc lapackqref.ps || die
	fi
}

pkg_postinst() {
	if [[ -z "$(eselect lapack show)" ]]; then
		eselect lapack set atlas
	fi

	elog
	elog "To link with ATLAS LAPACK from C or Fortran, simply use:"
	elog
	elog "-llapack"
	elog
	elog "C users: your header is /usr/include/atlas/clapack.h"
	elog
	elog "Configuration now uses eselect rather than lapack-config."
}