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# Copyright 1999-2025 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2
EAPI=8
inherit cmake cuda toolchain-funcs
DESCRIPTION="Fast approximate nearest neighbor searches in high dimensional spaces"
HOMEPAGE="https://github.com/flann-lib/flann"
SRC_URI="https://github.com/flann-lib/${PN}/archive/${PV}.tar.gz -> ${P}.tar.gz"
LICENSE="BSD"
SLOT="0"
KEYWORDS="~amd64 ~arm ~arm64 ~ppc ~x86 ~amd64-linux ~x86-linux"
IUSE="cuda doc examples mpi octave openmp"
BDEPEND="
app-arch/unzip
doc? ( dev-tex/latex2html )
mpi? ( app-admin/chrpath )
"
DEPEND="
app-arch/lz4:=
cuda? ( >=dev-util/nvidia-cuda-toolkit-5.5 )
mpi? (
dev-libs/boost:=[mpi]
sci-libs/hdf5:=[mpi=]
)
octave? ( >=sci-mathematics/octave-3.6.4-r1:= )
"
RDEPEND="${DEPEND}"
# TODO:
# readd dependencies for test suite,
# requires multiple ruby dependencies
PATCHES=(
"${FILESDIR}"/${PN}-1.9.1-build-oct-rather-than-mex-files-for-octave.patch # bug 830424
"${FILESDIR}"/${PN}-1.9.2-asio-boost187.patch
"${FILESDIR}"/${PN}-1.9.2-boost-config.patch
)
pkg_pretend() {
[[ ${MERGE_TYPE} != binary ]] && use openmp && tc-check-openmp
}
pkg_setup() {
[[ ${MERGE_TYPE} != binary ]] && use openmp && tc-check-openmp
}
src_prepare() {
# bug #302621
use mpi && export CXX=mpicxx
use cuda && cuda_src_prepare
cmake_src_prepare
}
src_configure() {
# python bindings are split off into dev-python/pyflann
local mycmakeargs=(
-DCMAKE_CXX_STANDARD=17
-DBUILD_C_BINDINGS=ON
-DBUILD_PYTHON_BINDINGS=OFF
-DBUILD_CUDA_LIB="$(usex cuda)"
-DBUILD_EXAMPLES="$(usex examples)"
-DBUILD_DOC="$(usex doc)"
-DBUILD_TESTS=OFF
-DBUILD_MATLAB_BINDINGS="$(usex octave)"
-DUSE_MPI="$(usex mpi)"
-DUSE_OPENMP="$(usex openmp)"
)
# einfo "NVCCFLAGS ${NVCCFLAGS}"
use cuda && mycmakeargs+=(
# -DCUDA_NVCC_FLAGS="${NVCCFLAGS} --linker-options \"-arsch\""
-DCUDA_NVCC_FLAGS="--compiler-bindir;$(cuda_gccdir)"
)
use doc && mycmakeargs+=( -DDOCDIR="share/doc/${PF}" )
cmake_src_configure
}
src_install() {
cmake_src_install
find "${ED}" -name 'lib*.a' -delete || die
# bug 795828; mpicc voluntarily adds some runpaths
if use mpi; then
chrpath -d "${ED}/usr/bin/flann_mpi_"{client,server} || die
fi
}
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