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# Copyright 1999-2023 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2
# @ECLASS: cuda.eclass
# @MAINTAINER:
# Gentoo Science Project <sci@gentoo.org>
# @SUPPORTED_EAPIS: 7 8
# @BLURB: Common functions for cuda packages
# @DESCRIPTION:
# This eclass contains functions to be used with cuda package. Currently it is
# setting and/or sanitizing NVCCFLAGS, the compiler flags for nvcc. This is
# automatically done and exported in src_prepare() or manually by calling
# cuda_sanatize.
# @EXAMPLE:
# inherit cuda
case ${EAPI} in
7|8) ;;
*) die "${ECLASS}: EAPI ${EAPI:-0} not supported" ;;
esac
if [[ -z ${_CUDA_ECLASS} ]]; then
_CUDA_ECLASS=1
inherit flag-o-matic toolchain-funcs
# @ECLASS_VARIABLE: NVCCFLAGS
# @DESCRIPTION:
# nvcc compiler flags (see nvcc --help), which should be used like
# CFLAGS for c compiler
: "${NVCCFLAGS:=-O2}"
# @ECLASS_VARIABLE: CUDA_VERBOSE
# @DESCRIPTION:
# Being verbose during compilation to see underlying commands
: "${CUDA_VERBOSE:=true}"
# @FUNCTION: cuda_gccdir
# @USAGE: [-f]
# @RETURN: gcc bindir compatible with current cuda, optionally (-f) prefixed with "--compiler-bindir "
# @DESCRIPTION:
# Helper for determination of the latest gcc bindir supported by
# then current nvidia cuda toolkit.
#
# Example:
# @CODE
# cuda_gccdir -f
# -> --compiler-bindir "/usr/x86_64-pc-linux-gnu/gcc-bin/4.6.3"
# @CODE
cuda_gccdir() {
debug-print-function ${FUNCNAME} "$@"
local dirs gcc_bindir ver vers="" flag
# Currently we only support the gnu compiler suite
if ! tc-is-gcc ; then
ewarn "Currently we only support the gnu compiler suite"
return 2
fi
while [[ "$1" ]]; do
case $1 in
-f)
flag="--compiler-bindir "
;;
*)
;;
esac
shift
done
if ! vers="$(cuda-config -s)"; then
eerror "Could not execute cuda-config"
eerror "Make sure >=dev-util/nvidia-cuda-toolkit-4.2.9-r1 is installed"
die "cuda-config not found"
fi
if [[ -z ${vers} ]]; then
die "Could not determine supported gcc versions from cuda-config"
fi
# Try the current gcc version first
ver=$(gcc-version)
if [[ -n "${ver}" ]] && [[ ${vers} =~ ${ver} ]]; then
dirs=( ${EPREFIX}/usr/*pc-linux-gnu/gcc-bin/${ver%.*}*/ )
gcc_bindir="${dirs[${#dirs[@]}-1]}"
fi
if [[ -z ${gcc_bindir} ]]; then
ver=$(best_version "sys-devel/gcc")
ver=$(ver_cut 1-2 "${ver##*sys-devel/gcc-}")
if [[ -n "${ver}" ]] && [[ ${vers} =~ ${ver} ]]; then
dirs=( ${EPREFIX}/usr/*pc-linux-gnu/gcc-bin/${ver%.*}*/ )
gcc_bindir="${dirs[${#dirs[@]}-1]}"
fi
fi
for ver in ${vers}; do
if has_version "=sys-devel/gcc-${ver}*"; then
dirs=( ${EPREFIX}/usr/*pc-linux-gnu/gcc-bin/${ver%.*}*/ )
gcc_bindir="${dirs[${#dirs[@]}-1]}"
fi
done
if [[ -n ${gcc_bindir} ]]; then
if [[ -n ${flag} ]]; then
echo "${flag}\"${gcc_bindir%/}\""
else
echo "${gcc_bindir%/}"
fi
return 0
else
eerror "Only gcc version(s) ${vers} are supported,"
eerror "of which none is installed"
die "Only gcc version(s) ${vers} are supported"
return 1
fi
}
# @FUNCTION: cuda_sanitize
# @DESCRIPTION:
# Correct NVCCFLAGS by adding the necessary reference to gcc bindir and
# passing CXXFLAGS to underlying compiler without disturbing nvcc.
cuda_sanitize() {
debug-print-function ${FUNCNAME} "$@"
local rawldflags=$(raw-ldflags)
# Be verbose if wanted
[[ "${CUDA_VERBOSE}" == true ]] && NVCCFLAGS+=" -v"
# Tell nvcc where to find a compatible compiler
NVCCFLAGS+=" $(cuda_gccdir -f)"
# Tell nvcc which flags should be used for underlying C compiler
NVCCFLAGS+=" --compiler-options \"${CXXFLAGS}\" --linker-options \"${rawldflags// /,}\""
debug-print "Using ${NVCCFLAGS} for cuda"
export NVCCFLAGS
}
# @FUNCTION: cuda_add_sandbox
# @USAGE: [-w]
# @DESCRIPTION:
# Add nvidia dev nodes to the sandbox predict list.
# with -w, add to the sandbox write list.
cuda_add_sandbox() {
debug-print-function ${FUNCNAME} "$@"
local i
for i in /dev/nvidia*; do
if [[ $1 == '-w' ]]; then
addwrite $i
else
addpredict $i
fi
done
}
# @FUNCTION: cuda_toolkit_version
# @DESCRIPTION:
# echo the installed version of dev-util/nvidia-cuda-toolkit
cuda_toolkit_version() {
debug-print-function ${FUNCNAME} "$@"
local v
v="$(best_version dev-util/nvidia-cuda-toolkit)"
v="${v##*cuda-toolkit-}"
ver_cut 1-2 "${v}"
}
# @FUNCTION: cuda_cudnn_version
# @DESCRIPTION:
# echo the installed version of dev-libs/cudnn
cuda_cudnn_version() {
debug-print-function ${FUNCNAME} "$@"
local v
v="$(best_version dev-libs/cudnn)"
v="${v##*cudnn-}"
ver_cut 1-2 "${v}"
}
# @FUNCTION: cuda_src_prepare
# @DESCRIPTION:
# Sanitise and export NVCCFLAGS by default
cuda_src_prepare() {
debug-print-function ${FUNCNAME} "$@"
cuda_sanitize
}
fi
EXPORT_FUNCTIONS src_prepare
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