eclass/llvm: Sync with Gentoo

It's from Gentoo commit 118145de3992a8249131bd0eb30ea89ad0bd0bdf.

sdk_container/src/third_party/portage-stable/eclass/llvm.eclass

@@ -7,6 +7,7 @@
 # @AUTHOR:
 # Michał Górny <mgorny@gentoo.org>
 # @SUPPORTED_EAPIS: 7 8
+# @PROVIDES: llvm-utils
 # @BLURB: Utility functions to build against slotted LLVM
 # @DESCRIPTION:
 # The llvm.eclass provides utility functions that can be used to build
@@ -64,6 +65,8 @@ esac
 if [[ ! ${_LLVM_ECLASS} ]]; then
 _LLVM_ECLASS=1
 
+inherit llvm-utils
+
 # make sure that the versions installing straight into /usr/bin
 # are uninstalled
 DEPEND="!!sys-devel/llvm:0"
@@ -174,95 +177,6 @@ get_llvm_prefix() {
 	echo "${prefix}/usr/lib/llvm/$(get_llvm_slot "${@}")"
 }
 
-# @FUNCTION: llvm_tuple_to_target
-# @USAGE: [<tuple>]
-# @DESCRIPTION:
-# Translate a tuple into a target suitable for LLVM_TARGETS.
-# Defaults to ${CHOST} if not specified.
-llvm_tuple_to_target() {
-	debug-print-function ${FUNCNAME} "${@}"
-
-	case ${1:-${CHOST}} in
-		aarch64*) echo "AArch64";;
-		amdgcn*) echo "AMDGPU";;
-		arc*) echo "ARC";;
-		arm*) echo "ARM";;
-		avr*) echo "AVR";;
-		bpf*) echo "BPF";;
-		csky*) echo "CSKY";;
-		loong*) echo "LoongArch";;
-		m68k*) echo "M68k";;
-		mips*) echo "Mips";;
-		msp430*) echo "MSP430";;
-		nvptx*) echo "NVPTX";;
-		powerpc*) echo "PowerPC";;
-		riscv*) echo "RISCV";;
-		sparc*) echo "Sparc";;
-		s390*) echo "SystemZ";;
-		x86_64*|i?86*) echo "X86";;
-		xtensa*) echo "Xtensa";;
-		*) die "Unknown LLVM target for tuple ${1:-${CHOST}}"
-	esac
-}
-
-# @FUNCTION: llvm_fix_clang_version
-# @USAGE: <variable-name>...
-# @DESCRIPTION:
-# Fix the clang compiler name in specified variables to include
-# the major version, to prevent PATH alterations from forcing an older
-# clang version being used.
-llvm_fix_clang_version() {
-	debug-print-function ${FUNCNAME} "${@}"
-
-	local shopt_save=$(shopt -p -o noglob)
-	set -f
-	local var
-	for var; do
-		local split=( ${!var} )
-		case ${split[0]} in
-			*clang|*clang++|*clang-cpp)
-				local version=()
-				read -r -a version < <("${split[0]}" --version)
-				local major=${version[-1]%%.*}
-				if [[ -n ${major//[0-9]} ]]; then
-					die "${var}=${!var} produced invalid --version: ${version[*]}"
-				fi
-
-				split[0]+=-${major}
-				if ! type -P "${split[0]}" &>/dev/null; then
-					die "${split[0]} does not seem to exist"
-				fi
-				declare -g "${var}=${split[*]}"
-				;;
-		esac
-	done
-	${shopt_save}
-}
-
-# @FUNCTION: llvm_fix_tool_path
-# @USAGE: <variable-name>...
-# @DESCRIPTION:
-# Fix the LLVM tools referenced in the specified variables to their
-# current location, to prevent PATH alterations from forcing older
-# versions being used.
-llvm_fix_tool_path() {
-	debug-print-function ${FUNCNAME} "${@}"
-
-	local shopt_save=$(shopt -p -o noglob)
-	set -f
-	local var
-	for var; do
-		local split=( ${!var} )
-		local path=$(type -P ${split[0]} 2>/dev/null)
-		# if it resides in one of the LLVM prefixes, it's an LLVM tool!
-		if [[ ${path} == "${BROOT}/usr/lib/llvm"* ]]; then
-			split[0]=${path}
-			declare -g "${var}=${split[*]}"
-		fi
-	done
-	${shopt_save}
-}
-
 # @FUNCTION: llvm_pkg_setup
 # @DESCRIPTION:
 # Prepend the appropriate executable directory for the newest
@@ -298,30 +212,7 @@ llvm_pkg_setup() {
 			llvm_fix_tool_path LLVM_CONFIG
 		fi
 
-		local prefix=${ESYSROOT}
+		llvm_prepend_path "${LLVM_SLOT}"
-		local llvm_path=${prefix}/usr/lib/llvm/${LLVM_SLOT}/bin
-		local IFS=:
-		local split_path=( ${PATH} )
-		local new_path=()
-		local x added=
-
-		# prepend new path before first LLVM version found
-		for x in "${split_path[@]}"; do
-			if [[ ${x} == */usr/lib/llvm/*/bin ]]; then
-				if [[ ${x} != ${llvm_path} ]]; then
-					new_path+=( "${llvm_path}" )
-				elif [[ ${added} && ${x} == ${llvm_path} ]]; then
-					# deduplicate
-					continue
-				fi
-				added=1
-			fi
-			new_path+=( "${x}" )
-		done
-		# ...or to the end of PATH
-		[[ ${added} ]] || new_path+=( "${llvm_path}" )
-
-		export PATH=${new_path[*]}
 	fi
 }