# Copyright 1999-2021 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

EAPI=7

inherit flag-o-matic toolchain-funcs

DESCRIPTION="Elliptic Curve Method for Integer Factorization"
HOMEPAGE="http://ecm.gforge.inria.fr/"
SRC_URI="https://gforge.inria.fr/frs/download.php/file/36224/${P}.tar.gz"

LICENSE="GPL-3 LGPL-3"
SLOT="0"
KEYWORDS="amd64 ~arm ~arm64 x86 ~ppc-macos ~x64-macos"
IUSE="+custom-tune openmp static-libs cpu_flags_x86_sse2"

DEPEND="dev-libs/gmp:="
RDEPEND="${DEPEND}"

S="${WORKDIR}/ecm-${PV}"

pkg_pretend() {
	use openmp && tc-check-openmp
}

src_compile() {
	default
	if use custom-tune; then
		# One "emake" was needed to build the library. Now we can find
		# the best set of parameters, and then run "emake" one more time
		# to rebuild the library with the custom parameters. See the
		# project's README or INSTALL-ecm. The build targets don't depend
		# on ecm-params.h, so we need to "make clean" to force a rebuild.
		emake ecm-params && emake clean && emake
	fi
}
src_configure() {
	econf \
		--enable-shared \
		$(use_enable static-libs static) \
		$(use_enable openmp) \
		$(use_enable cpu_flags_x86_sse2 sse2) \
		$(use_enable custom-tune asm-redc)
}