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llvm-r1.eclass
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llvm-r1.eclass
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# Copyright 2024 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2
# @ECLASS: llvm-r1.eclass
# @MAINTAINER:
# Michał Górny <[email protected]>
# @AUTHOR:
# Michał Górny <[email protected]>
# @SUPPORTED_EAPIS: 8
# @PROVIDES: llvm-utils
# @BLURB: Provide LLVM_SLOT to build against slotted LLVM
# @DESCRIPTION:
# An eclass to reliably depend on a set of LLVM-related packages
# in a matching slot. To use the eclass:
#
# 1. Set LLVM_COMPAT to the list of supported LLVM slots.
# 2. Use llvm_gen_dep and/or LLVM_USEDEP to add appropriate
# dependencies.
# 3. Use llvm-r1_pkg_setup, get_llvm_prefix or LLVM_SLOT.
#
# The eclass sets IUSE and REQUIRED_USE. The flag corresponding
# to the newest supported stable LLVM slot (or the newest testing,
# if no stable slots are supported) is enabled by default.
#
# Example:
# @CODE
# LLVM_COMPAT=( {16..18} )
#
# inherit llvm-r1
#
# DEPEND="
# dev-libs/libfoo[${LLVM_USEDEP}]
# $(llvm_gen_dep '
# sys-devel/clang:${LLVM_SLOT}
# sys-devel/llvm:${LLVM_SLOT}
# ')
# "
# @CODE
case ${EAPI} in
8) ;;
*) die "${ECLASS}: EAPI ${EAPI:-0} not supported" ;;
esac
if [[ ! ${_LLVM_R1_ECLASS} ]]; then
_LLVM_R1_ECLASS=1
inherit llvm-utils
# == internal control knobs ==
# @ECLASS_VARIABLE: _LLVM_OLDEST_SLOT
# @INTERNAL
# @DESCRIPTION:
# Oldest supported LLVM slot. This is used to automatically filter out
# unsupported LLVM_COMPAT values.
_LLVM_OLDEST_SLOT=15
# @ECLASS_VARIABLE: _LLVM_NEWEST_STABLE
# @INTERNAL
# @DESCRIPTION:
# The newest stable LLVM version. Versions newer than that won't
# be automatically enabled via USE defaults.
_LLVM_NEWEST_STABLE=17
# == control variables ==
# @ECLASS_VARIABLE: LLVM_COMPAT
# @PRE_INHERIT
# @REQUIRED
# @DESCRIPTION:
# A list of LLVM slots supported by the package, oldest to newest.
#
# Example:
# @CODE
# LLVM_COMPAT=( {15..17} )
# @CODE
# @ECLASS_VARIABLE: LLVM_OPTIONAL
# @PRE_INHERIT
# @DEFAULT_UNSET
# @DESCRIPTION:
# If set to a non-empty value, disables setting REQUIRED_USE
# and exporting pkg_setup. You have to add LLVM_REQUIRED_USE and call
# pkg_setup manually, with appropriate USE conditions.
# == global metadata ==
# @ECLASS_VARIABLE: LLVM_REQUIRED_USE
# @OUTPUT_VARIABLE
# @DESCRIPTION:
# An eclass-generated REQUIRED_USE string that enforces selecting
# exactly one slot. It LLVM_OPTIONAL is set, it needs to be copied
# into REQUIRED_USE, under appropriate USE conditions. Otherwise,
# it is added automatically.
# @ECLASS_VARIABLE: LLVM_USEDEP
# @OUTPUT_VARIABLE
# @DESCRIPTION:
# An eclass-generated USE dependency string that can be applied to other
# packages using the same eclass, to enforce a LLVM slot match.
_llvm_set_globals() {
debug-print-function ${FUNCNAME} "${@}"
if [[ ${LLVM_COMPAT@a} != *a* ]]; then
die "LLVM_COMPAT must be set to an array before inheriting ${ECLASS}"
fi
local stable=() unstable=()
local x
for x in "${LLVM_COMPAT[@]}"; do
if [[ ${x} -gt ${_LLVM_NEWEST_STABLE} ]]; then
unstable+=( "${x}" )
elif [[ ${x} -ge ${_LLVM_OLDEST_SLOT} ]]; then
stable+=( "${x}" )
fi
done
_LLVM_SLOTS=( "${stable[@]}" "${unstable[@]}" )
if [[ ! ${_LLVM_SLOTS[@]} ]]; then
die "LLVM_COMPAT does not contain any valid versions (all older than ${_LLVM_OLDEST_SLOT}?)"
fi
if [[ ${stable[@]} ]]; then
IUSE="+llvm_slot_${stable[-1]}"
unset 'stable[-1]'
else
IUSE="+llvm_slot_${unstable[-1]}"
unset 'unstable[-1]'
fi
local nondefault=( "${stable[@]}" "${unstable[@]}" )
IUSE+=" ${nondefault[*]/#/llvm_slot_}"
local flags=( "${_LLVM_SLOTS[@]/#/llvm_slot_}" )
LLVM_REQUIRED_USE="^^ ( ${flags[*]} )"
local usedep_flags=${flags[*]/%/(-)?}
LLVM_USEDEP=${usedep_flags// /,}
readonly LLVM_REQUIRED_USE LLVM_USEDEP
if [[ ! ${LLVM_OPTIONAL} ]]; then
REQUIRED_USE=${LLVM_REQUIRED_USE}
fi
}
_llvm_set_globals
unset -f _llvm_set_globals
# == metadata helpers ==
# @FUNCTION: llvm_gen_dep
# @USAGE: <dependency>
# @DESCRIPTION:
# Output a dependency block, repeating "<dependency>" conditionally
# to all llvm_slot_* USE flags. Any occurences of '${LLVM_SLOT}'
# within the block will be substituted for the respective slot.
#
# Example:
# @CODE
# DEPEND="
# $(llvm_gen_dep '
# sys-devel/clang:${LLVM_SLOT}
# sys-devel/llvm:${LLVM_SLOT}
# ')
# "
# @CODE
llvm_gen_dep() {
debug-print-function ${FUNCNAME} "${@}"
[[ ${#} -ne 1 ]] && die "Usage: ${FUNCNAME} <dependency>"
local dep=${1}
local slot
for slot in "${_LLVM_SLOTS[@]}"; do
echo "llvm_slot_${slot}? ( ${dep//\$\{LLVM_SLOT\}/${slot}} )"
done
}
# == ebuild helpers ==
# @FUNCTION: get_llvm_prefix
# @USAGE: [-b|-d]
# @DESCRIPTION:
# Output the path to the selected LLVM slot.
#
# With no option or "-d", the path is prefixed by ESYSROOT. LLVM
# dependencies should be in DEPEND then.
#
# With "-b" option, the path is prefixed by BROOT. LLVM dependencies
# should be in BDEPEND then.
get_llvm_prefix() {
debug-print-function ${FUNCNAME} "${@}"
[[ ${#} -gt 1 ]] && die "Usage: ${FUNCNAME} [-b|-d]"
local prefix
case ${1--d} in
-d)
prefix=${ESYSROOT}
;;
-b)
prefix=${BROOT}
;;
*)
die "${FUNCNAME}: invalid option: ${1}"
;;
esac
echo "${prefix}/usr/lib/llvm/${LLVM_SLOT}"
}
# @FUNCTION: llvm-r1_pkg_setup
# @DESCRIPTION:
# Prepend the appropriate executable directory for the selected LLVM
# slot to PATH.
#
# The PATH manipulation is only done for source builds. The function
# is a no-op when installing a binary package.
#
# If any other behavior is desired, the contents of the function
# should be inlined into the ebuild and modified as necessary.
#
# Note that this function is not exported if LLVM_OPTIONAL is set.
# In that case, it needs to be called manually.
llvm-r1_pkg_setup() {
debug-print-function ${FUNCNAME} "${@}"
if [[ ${MERGE_TYPE} != binary ]]; then
[[ -z ${LLVM_SLOT} ]] && die "LLVM_SLOT unset (broken USE_EXPAND?)"
llvm_fix_clang_version CC CPP CXX
# keep in sync with profiles/features/llvm/make.defaults!
llvm_fix_tool_path ADDR2LINE AR AS LD NM OBJCOPY OBJDUMP RANLIB
llvm_fix_tool_path READELF STRINGS STRIP
# Set LLVM_CONFIG to help Meson (bug #907965) but only do it
# for empty ESYSROOT (as a proxy for "are we cross-compiling?").
if [[ -z ${ESYSROOT} ]] ; then
llvm_fix_tool_path LLVM_CONFIG
fi
llvm_prepend_path "${LLVM_SLOT}"
fi
}
fi
if [[ ! ${LLVM_OPTIONAL} ]]; then
EXPORT_FUNCTIONS pkg_setup
fi