# Copyright 1999-2023 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

EAPI=8

inherit toolchain-funcs

MY_PN="ecm"
MY_P="${MY_PN}-${PV}"
DESCRIPTION="Elliptic Curve Method for Integer Factorization"
HOMEPAGE="https://gitlab.inria.fr/zimmerma/ecm"
SRC_URI="https://gitlab.inria.fr/zimmerma/ecm/uploads/89f6f0d65d3e980cef33dc922004e4b2/${MY_P}.tar.gz"

LICENSE="GPL-3 LGPL-3"
SLOT="0"
KEYWORDS="amd64 ~arm ~arm64 ~loong ~ppc64 ~riscv ~x86 ~ppc-macos ~x64-macos"
IUSE="+custom-tune openmp cpu_flags_x86_sse2"

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

# xsltproc is used to produce the manppage in combination with the
# appropriate stylesheet
BDEPEND="dev-libs/libxslt
	app-text/docbook-xsl-stylesheets"

S="${WORKDIR}/${MY_P}"

pkg_pretend() {
	[[ ${MERGE_TYPE} != binary ]] && use openmp && tc-check-openmp
}

pkg_setup() {
	[[ ${MERGE_TYPE} != binary ]] && 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 openmp) \
		$(use_enable cpu_flags_x86_sse2 sse2) \
		$(use_enable custom-tune asm-redc)
}

src_install() {
	default
	find "${ED}" -name '*.la' -delete || die
}