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README.md

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+# eselect-clang
+
+A slightly modified version of one of the usual modules to manage the
+`clang` and `clang++` symlinks in Gentoo's `eselect`-system.
+
+## Installation
+Copy the file to `/usr/share/eselect/modules`.

clang.eselect

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+# -*-eselect-*- vim: ft=eselect
+# Copyright 2005-2020 Gentoo Authors
+# Distributed under the terms of the GNU GPL version 2 or later
+
+DESCRIPTION="Manage clang symlink"
+MAINTAINER="Infrasonics <infrasonics@gmx.de>"
+SVN_DATE='$Date: $'
+VERSION=$(svn_date_to_version "${SVN_DATE}" )
+
+
+find_targets() {
+ local llvmdir=$(find /usr/lib /usr/lib64 \
+ -type d \
+ \( -path "/usr/lib*/llvm" -a \! -path "*/debug/*" \) \
+ -prune)
+ local rt
+ for t in ${llvmdir}/*/bin/${1:-clang}; do
+ [[ -L ${t} ]] || continue
+ rt=$(canonicalise ${t})
+ [[ -x ${rt} ]] || continue
+ echo ${rt}
+ done
+}
+
+check_target() {
+ local target=${1} targets
+ targets=( $(find_targets ) )
+
+ # number from the list
+ if is_number ${target} && [[ ${target} -ge 1 ]] ; then
+ if [[ ${target} -gt ${#targets[@]} ]] ; then
+ target="invalid"
+ elif [[ -e "${targets[$(( ${target} - 1 ))]}" ]] ; then
+ target=$(basename ${targets[$((${target} - 1 ))]} )
+ else
+ write_warning_msg ${targets[$((${target} - 1 ))]}
+ target="invalid"
+ fi
+ else
+ [[ -e "${EROOT}/usr/bin/${target}" ]] || \
+ target="invalid"
+ fi
+
+ echo ${target}
+}
+
+remove_symlinks() {
+ rm -f /usr/bin/clang
+ rm -f /usr/bin/clang++
+}
+
+create_symlinks() {
+ local target=${1} version
+ local targets=( $(find_targets) )
+ local tpath=""
+ local version=${target##*clang}
+
+ # find correct full target path as llvm usually is not in $PATH
+ for (( i = 0; i < ${#targets[@]}; i++ )) ; do
+ if [[ $(basename ${targets[i]}) = ${target} ]] ; then
+ tpath=$(dirname ${targets[i]})
+ fi
+ done
+
+ local path="${EROOT}/usr/bin"
+ for f in clang clang++; do
+ ln -s "${tpath}/${f}" "${path}/${f}" || \
+ die -q "Could not set ${f} symlink"
+ done
+
+ write_list_start "Successfully switched to profile:"
+ write_kv_list_entry "${target}" ""
+}
+
+### list action
+describe_list() {
+ echo "List all installed version of clang"
+}
+
+do_list() {
+ local targets=( $(find_targets) )
+
+ for (( i = 0; i < ${#targets[@]}; i++ )) ; do
+ line=$(basename "${targets[i]}")
+
+ # find out the current version
+ if [[ ${targets[i]} = $(canonicalise /usr/bin/clang) ]] ; then
+ targets[i]=$(highlight_marker "${line}")
+ else
+ targets[i]=${line}
+ fi
+ done
+
+ write_numbered_list -m "(none found)" "${targets[@]}"
+}
+
+
+### set action ###
+describe_set() {
+ echo "Switches to a clang profile."
+}
+
+describe_set_options() {
+ echo "target : Target name or number (from 'list' action)"
+}
+
+describe_set_parameters() {
+ echo "<target>"
+}
+
+do_set() {
+ [[ -z ${@} ]] && die -q "Parameter expected."
+
+ local target=$(check_target ${1})
+
+ [[ ${target} = "invalid" ]] && die -q "Can't use that profile. No suitable Ruby interpreter found."
+
+ remove_symlinks || \
+ die -q "Could not remove symlinks"
+
+ create_symlinks ${target}
+}
+
+
+### show action
+
+describe_show() {
+ echo "Print the currently active clang version"
+}
+
+do_show() {
+ [[ -z "${@}" ]] || die -q "This function does not expect any arguments"
+
+ local version=""
+
+ if [[ -L "${EROOT}/usr/bin/clang" ]] ; then
+ version=$(basename $(canonicalise ${EROOT}/usr/bin/clang) )
+ else
+ write_kv_list_entry "(none)"
+ return 1
+ fi
+ write_list_start "Current clang version:"
+ write_kv_list_entry ${version} ""
+}
+
+# vim: ts=4 sw=4 noet fdm=marker