From 1189519f1cc3ff77b13b67b2e3c0d243beb9569c Mon Sep 17 00:00:00 2001
From: "Andreas K. Hüttel" <dilfridge@gentoo.org>
Date: Sat, 16 Dec 2017 00:42:37 +0100
Subject: Version 3

https://sources.gentoo.org/cgi-bin/viewvc.cgi/gentoo-x86/sys-devel/binutils-config/files/binutils-config-3?revision=1.11
---
 binutils-config | 333 ++++++++++++++++++++++++++++++++++----------------------
 1 file changed, 204 insertions(+), 129 deletions(-)

diff --git a/binutils-config b/binutils-config
index bbb8f8d..5f21878 100644
--- a/binutils-config
+++ b/binutils-config
@@ -1,7 +1,7 @@
 #!/bin/bash
-# Copyright 1999-2009 Gentoo Foundation
+# Copyright 1999-2013 Gentoo Foundation
 # Distributed under the terms of the GNU General Public License v2
-# $Header: /var/cvsroot/gentoo-x86/sys-devel/binutils-config/files/binutils-config-2,v 1.3 2011/04/03 21:44:42 vapier Exp $
+# $Header: /var/cvsroot/gentoo-x86/sys-devel/binutils-config/files/binutils-config-3,v 1.11 2013/05/05 05:20:42 vapier Exp $
 
 # Format of /etc/env.d/binutils/:
 #  config-TARGET:	CURRENT=version for TARGET
@@ -9,7 +9,7 @@
 
 : ${ROOT:=/}
 [[ ${ROOT} != */ ]] && ROOT="${ROOT}/"
-[[ ${ROOT} != /* ]] && ROOT="${PWD}${ROOT}"
+[[ ${ROOT} != /* ]] && ROOT="${PWD%/}/${ROOT}"
 
 cd /
 
@@ -21,11 +21,11 @@ source /etc/init.d/functions.sh || {
 	exit 1
 }
 esyslog() { :; }
+die() { eerror "${argv0}: $*"; exit 1; }
 umask 022
 
 usage() {
 cat << USAGE_END
-
 Usage: ${HILITE}binutils-config${NORMAL} ${GOOD}[options]${NORMAL} ${BRACKET}[binutils profile]${NORMAL}
 
 ${HILITE}General Options:${NORMAL}
@@ -34,6 +34,9 @@ ${HILITE}General Options:${NORMAL}
   ${GOOD}-u, --uninstall${NORMAL}            Remove all signs of specified target
   ${GOOD}-d, --debug${NORMAL}                Execute with debug output
 
+${HILITE}General Cruft:${NORMAL}
+  ${GOOD}--linker${NORMAL} <linker>          Switch to specified linker (if supported)
+
 ${HILITE}Arch Specific Cruft:${NORMAL}
   ${GOOD}--amd64${NORMAL}                    Install extra amd64 links (x86_64)
   ${GOOD}--arm${NORMAL}                      Install extra arm links (arm/armeb)
@@ -56,8 +59,28 @@ mv_if_diff() {
 		mv -f "$1" "$2"
 	fi
 }
+atomic_ln() {
+	local target=$1 linkdir=$2 linkname=$3 linktmp linkfull
+	linktmp="${linkdir}/.binutils-config.tmp.${linkname}"
+	linkfull="${linkdir}/${linkname}"
+	if [[ -d ${linkfull} ]] ; then
+		# if linking to a dir, we need a little magic to
+		# make it atomic since `mv -T` is not portable
+		rm -rf "${linktmp}"
+		mkdir -p "${linktmp}"
+		ln -sf "${target}" "${linktmp}/${linkname}"
+		mv "${linktmp}/${linkname}" "${linktmp}/../"
+		rmdir "${linktmp}"
+	else
+		# `ln` will expand into unlink();symlink(); which
+		# is not atomic for a small amount of time, but
+		# `mv` is a single rename() call
+		ln -sf "${target}" "${linktmp}"
+		mv "${linktmp}" "${linkfull}"
+	fi
+}
 
-switch_profile() {
+setup_env() {
 	unset TARGET VER LIBPATH FAKE_TARGETS
 	source "${ENV_D}/${PROFILE}"
 	if [[ -z ${TARGET} ]] ; then
@@ -88,8 +111,6 @@ switch_profile() {
 	local fake_targ_append="${TARGET#*-}"
 	FAKE_TARGETS="${FAKE_TARGETS} ${FAKE_TARGETS_USER// /-${fake_targ_append} }"
 
-	ebegin "Switching to ${PROFILE}"
-
 	#
 	# Generate binary symlinks
 	# On systems that do 32bit/64bit, we need to fake an
@@ -111,17 +132,24 @@ switch_profile() {
 		BINPATH=/usr/${TARGET}/binutils-bin/${VER}
 		BINPATH_LINKS=/usr/${TARGET}/bin
 	fi
+}
+
+switch_profile() {
+	ebegin "Switching to ${PROFILE}"
+
+	setup_env || return 1
+
 	cd "${ROOT}/${BINPATH}" || exit 1
 	mkdir -p "${ROOT}/${BINPATH_LINKS}" "${ROOT}/usr/bin"
 	for x in * ; do
-		ln -sf "${BINPATH}/${x}" "${ROOT}/${BINPATH_LINKS}/${x}"
-		ln -sf "${BINPATH_LINKS}/${x}" "${ROOT}"/usr/bin/${TARGET}-${x}
+		atomic_ln "${BINPATH}/${x}" "${ROOT}/${BINPATH_LINKS}" "${x}"
+		atomic_ln "${BINPATH_LINKS}/${x}" "${ROOT}/usr/bin/" "${TARGET}-${x}"
 		for fake in ${FAKE_TARGETS} ; do
 			[[ -f ${ENV_D}/config-${fake} ]] && continue
-			ln -sf "${BINPATH_LINKS}/${x}" "${ROOT}"/usr/bin/${fake}-${x}
+			atomic_ln "${BINPATH_LINKS}/${x}" "${ROOT}/usr/bin" "${fake}-${x}"
 		done
 		if [[ ${TARGET} == ${HOST} ]] ; then
-			ln -sf ${TARGET}-${x} "${ROOT}"/usr/bin/${x}
+			atomic_ln "${TARGET}-${x}" "${ROOT}/usr/bin" "${x}"
 		fi
 	done
 
@@ -134,17 +162,14 @@ switch_profile() {
 		dstlib=${ROOT}/usr/${HOST}/lib
 	else
 		dstlib=${ROOT}/usr/${HOST}/${TARGET}/lib
-		# Clean out old path
-		rm -rf "${ROOT}"/usr/${TARGET}/lib/ldscripts
-		rmdir "${ROOT}"/usr/${TARGET}/lib >& /dev/null
 	fi
 	# When upgrading, we need to clean up ldscripts and libs
-	rm -rf "${dstlib}/ldscripts" "${ROOT}/${BINPATH_LINKS}"/ldscripts
 	mkdir -p "${dstlib}"
-	ln -sf "${LIBPATH}/ldscripts" "${dstlib}"/ldscripts
-	find -L "${dstlib}" -type l -exec rm {} +
+	rm -rf "${ROOT}/${BINPATH_LINKS}"/ldscripts
+	atomic_ln "${LIBPATH}/ldscripts" "${dstlib}" "ldscripts"
+	find -L "${dstlib}" -type l -exec rm -v {} +
 	for x in lib* ; do
-		ln -sf "${LIBPATH}/${x}" "${dstlib}/${x}"
+		atomic_ln "${LIBPATH}/${x}" "${dstlib}" "${x}"
 	done
 
 	#
@@ -156,7 +181,7 @@ switch_profile() {
 		if [[ ${HOST} == ${TARGET} ]] ; then
 			mkdir -p "${ROOT}/usr/include"
 			for x in * ; do
-				ln -sf "${INCPATH}/${x}" "${ROOT}/usr/include/${x}"
+				atomic_ln "${INCPATH}/${x}" "${ROOT}/usr/include" "${x}"
 			done
 		else
 			# Clean out old path -- cannot use '-exec {} +' syntax here
@@ -212,9 +237,10 @@ switch_profile() {
 }
 
 uninstall_target() {
+	: ${TARGET:=${UARG}}
+
 	if [[ ${TARGET} == ${HOST} ]] ; then
-		eerror "${argv0}: Refusing to uninstall native binutils"
-		exit 1
+		die "refusing to uninstall native binutils"
 	fi
 
 	shopt -s nullglob
@@ -225,18 +251,24 @@ uninstall_target() {
 		rm -f "${ENV_D}"/${PROFILE}
 	done
 	if [[ -z ${PROFILE} ]] && [[ ! -e ${ENV_D}/config-${TARGET} ]] ; then
-		eerror "${argv0}: No profiles exist for '${TARGET}'"
-		exit 1
+		die "no profiles exist for '${TARGET}'"
 	fi
 
 	rm -f "${ENV_D}"/config-${TARGET} "${ROOT}"/etc/ld.so.conf.d/05binutils.conf
 
 	# XXX: we still leave behind FAKE_TARGETS in /usr/bin ...
-	for x in addr2line ar as c++filt elf2flt flthdr gprof ld ld.real \
-	         nm objcopy objdump ranlib readelf size strings strip ; do
-		rm -f "${ROOT}"/usr/bin/${TARGET}-${x}
-		rm -f "${ROOT}"/usr/{${HOST}/,}${TARGET}/bin/${x}
-		rm -f "${ROOT}"/usr/libexec/gcc/${TARGET}/${x}
+	local x
+	for x in \
+		addr2line ar as c++filt elf2flt elfedit flthdr gprof \
+		ld ld.{bfd,gold,real} \
+		nm objcopy objdump ranlib readelf size strings strip
+	do
+		x=(
+			"${ROOT}"/usr/bin/${TARGET}-${x}
+			"${ROOT}"/usr/{${HOST}/,}${TARGET}/bin/${x}
+			"${ROOT}"/usr/libexec/gcc/${TARGET}/${x}
+		)
+		rm -f "${x[@]}"
 	done
 	for x in ansidecl.h bfd.h bfdlink.h dis-asm.h symcat.h ; do
 		rm -f "${ROOT}"/usr/{${HOST}/,}${TARGET}/{usr/,}include/${x}
@@ -252,69 +284,104 @@ uninstall_target() {
 		"${destdir}"/{bin,include,lib,usr} \
 		"${destdir}" \
 		"${ROOT}"/var/db/pkg/cross-${TARGET} \
+		"${ROOT}"/usr/{${HOST}/,}${TARGET}/bin \
+		"${ROOT}"/usr/libexec/gcc/${TARGET} \
 		2>/dev/null
 
 	rm -f "${ENV_D}"/${TARGET}-*
 }
 
-get_current_profile() {
-	if [[ ! -f ${ENV_D}/config-${PROFILE} ]] ; then
-		eerror "${argv0}: No binutils profile is active!"
+set_current_profile() {
+	if [[ ! -f ${ENV_D}/config-${TARGET} ]] ; then
+		eerror "${argv0}: unable to locate a profile for target: ${TARGET}"
 		return 1
 	fi
 
-	source "${ENV_D}/config-${PROFILE}"
+	source "${ENV_D}/config-${TARGET}"
 
 	if [[ -z ${CURRENT} ]] ; then
-		eerror "${argv0}: No binutils profile is active!"
+		eerror "${argv0}: no binutils profile is active!"
 		return 1
 	fi
 
-	echo "${PROFILE}-${CURRENT}"
+	echo "${TARGET}-${CURRENT}"
 
 	return 0
 }
+get_current_profile() { echo "${PROFILE}" ; }
 
 list_profiles() {
-	local i=1
-
-	set_HOST
+	local x i target
 
 	if [[ ${ROOT} != / ]] ; then
 		echo "Using binutils-config info in ${ROOT}"
 	fi
+
+	set -- "${ENV_D}"/*
 	target=
-	for x in "${ENV_D}"/* ; do
-		if [[ -f ${x} ]] && [[ ${x/\/config-} == ${x} ]] ; then
-			source "${x}"
-			if [[ ${target} != ${TARGET} ]] ; then
-				[[ -n ${target} ]] && echo
-				target=${TARGET}
-			fi
+	i=1
 
-			x=${x##*/}
-			if [[ -e ${ENV_D}/config-${TARGET} ]] ; then
-				source "${ENV_D}/config-${TARGET}"
-				if [[ ${VER} == ${CURRENT} ]] ; then
-					[[ ${TARGET} == ${HOST} ]] \
-						&& x="${x} ${GOOD}*${NORMAL}" \
-						|| x="${x} ${HILITE}*${NORMAL}"
-				fi
+	for x ; do
+		# skip broken links and config files
+		[[ -f ${x} ]] || continue
+		[[ ${x} == */config-* ]] && continue
+
+		source "${x}"
+		if [[ ${target} != ${TARGET} ]] ; then
+			[[ -n ${target} ]] && echo
+			target=${TARGET}
+		fi
+
+		x=${x##*/}
+		if [[ -e ${ENV_D}/config-${TARGET} ]] ; then
+			source "${ENV_D}/config-${TARGET}"
+			if [[ ${VER} == ${CURRENT} ]] ; then
+				[[ ${TARGET} == ${HOST} ]] \
+					&& x="${x} ${GOOD}*${NORMAL}" \
+					|| x="${x} ${HILITE}*${NORMAL}"
 			fi
-			echo " [${i}] ${x}"
-			((++i))
 		fi
+
+		# We would align the [...] field like so:
+		#printf ' [%*ss] %s\n' ${##} "${i}" "${x}"
+		# but this breaks simple scripting: `binutils -l | awk '{print $2}'`
+
+		# Or we could align the target col like so:
+		#printf ' [%s]%*s %s\n' "${i}" $(( ${##} - ${#i} )) "" "${x}"
+		# but i'm not sold that it looks better
+
+		# So keep it simple ... only makes a diff anyways for crazy people
+		# like me which have 100+ binutils packages installed ...
+		echo " [$i] ${x}"
+		((++i))
 	done
 }
 
-set_HOST() {
-	[[ -n ${HOST} ]] && return 0
+switch_linker() {
+	local bpath ld=$1
 
-	if [[ -z ${CHOST} ]] ; then
-		HOST=$(portageq envvar CHOST)
-	else
-		HOST=${CHOST}
+	case ${ld} in
+	ld.*) ;;
+	*) die "not supported: linker must start with 'ld.'" ;;
+	esac
+
+	setup_env || return 1
+	bpath="${ROOT}/${BINPATH}"
+
+	# does this binutils even support the requested linker ?
+	if [[ ! -e ${bpath}/${ld} ]] ; then
+		die "sorry, but ${PROFILE} doesn't support the ${ld} linker"
 	fi
+
+	# switch it up
+	ebegin "Setting default linker to ${ld} for ${PROFILE}"
+	atomic_ln ${ld} "${bpath}" ld
+	eend $?
+}
+
+set_HOST() {
+	# Set HOST to CHOST if it isn't already set
+	: ${HOST:=${CHOST:-$(portageq envvar CHOST)}}
 }
 
 ENV_D="${ROOT}etc/env.d/binutils"
@@ -322,43 +389,34 @@ ENV_D="${ROOT}etc/env.d/binutils"
 DEBUG="no"
 NEED_ACTION="yes"
 DOIT="switch_profile"
-PROFILE=""
+PROFILE="current"
 FAKE_TARGETS_USER=""
 HOST=""
+TARGET=""
+unset UARG
+
+select_action() {
+	if [[ ${NEED_ACTION} != "no" ]] ; then
+		NEED_ACTION="no"
+		DOIT=$1
+	else
+		die "one action at a time!"
+	fi
+}
 
 while [[ $# -gt 0 ]] ; do
 	x=$1
 	shift
 	case ${x} in
-		-c|--get-current-profile)
-			if [[ ${NEED_ACTION} == "yes" ]] ; then
-				NEED_ACTION="no"
-				DOIT="get_current_profile"
-			fi
-			;;
-		-d|--debug)
-			DEBUG="yes"
-			;;
-		-l|--list-profiles)
-			if [[ ${NEED_ACTION} == "yes" ]] ; then
-				NEED_ACTION="no"
-				DOIT="list_profiles"
-			fi
-			;;
-		-u|--uninstall)
-			if [[ ${NEED_ACTION} == "yes" ]] ; then
-				NEED_ACTION="no"
-				DOIT="uninstall_target"
-				TARGET=$1
-				shift
-			fi
-			;;
-		-h|--help)
-			usage 0
-			;;
+		-c|--get-current-profile)  select_action get_current_profile ;;
+		-l|--list|--list-profiles) select_action list_profiles ;;
+		-u|--uninstall)            select_action uninstall_target ;;
+		--linker)                  select_action "switch_linker $1"; shift ;;
+		-d|--debug)                DEBUG="yes" ;;
+		-h|--help)                 usage 0 ;;
 		-V|--version)
 			unset Header
-			cvsver="$Header: /var/cvsroot/gentoo-x86/sys-devel/binutils-config/files/binutils-config-2,v 1.3 2011/04/03 21:44:42 vapier Exp $"
+			cvsver="$Header: /var/cvsroot/gentoo-x86/sys-devel/binutils-config/files/binutils-config-3,v 1.11 2013/05/05 05:20:42 vapier Exp $"
 			cvsver=${cvsver##*binutils-config-}
 			bver=${cvsver%%,v *}
 			cvsver=${cvsver#* }
@@ -369,7 +427,6 @@ while [[ $# -gt 0 ]] ; do
 			if [[ ${NEED_ACTION} == "yes" ]] ; then
 				# Make sure we have a space after each target
 				NEED_ACTION="no"
-				[[ -z ${PROFILE} ]] && PROFILE="current"
 				case ${x} in
 					--amd64) FAKE_TARGETS_USER="x86_64 ";;
 					--arm)   FAKE_TARGETS_USER="arm armeb ";;
@@ -379,46 +436,14 @@ while [[ $# -gt 0 ]] ; do
 			fi
 			;;
 		-*)
-			eerror "${0##*/}: Invalid switch!  Try '--help'."
-			exit 1
+			die "invalid switch!  Try '--help'."
 			;;
 		*)
-			if [[ -n ${PROFILE} ]] && [[ ${PROFILE} != "current" ]] ; then
-				eerror "${argv0}: Too many arguments!  Run ${argv0} without parameters for help."
-				exit 1
-			fi
-
-			if [[ -z $(echo ${x} | tr -d '[:digit:]') ]] ; then
-				# User gave us a # representing the profile
-				i=1
-				for y in "${ENV_D}"/* ; do
-					[[ ${y/config-} != ${y} ]] && continue
-
-					if [[ -f ${y} ]] && [[ ${x} -eq ${i} ]] ; then
-						PROFILE=${y##*/}
-						NEED_ACTION="no"
-						break
-					fi
-					((++i))
-				done
-			fi
-
-			if [[ -z ${PROFILE} ]] ; then
-				# User gave us a full HOST-ver
-				x=${x##*/}
-				if [[ ! -f ${ENV_D}/${x} ]] && [[ ! -f ${ENV_D}/config-${x} ]] ; then
-					# Maybe they just gave us a ver ...
-					set_HOST
-					if [[ -f ${ENV_D}/${HOST}-${x} ]] ; then
-						x=${HOST}-${x}
-					else
-						eerror "${argv0}: Could not locate '$x' in '${ENV_D}/'!"
-						exit 1
-					fi
-				fi
-				PROFILE=${x}
-				NEED_ACTION="no"
+			if [[ ${UARG+set} == "set" ]] ; then
+				die "only one profile/target at a time please"
 			fi
+			NEED_ACTION="maybe"
+			UARG=${x}
 			;;
 	esac
 done
@@ -426,9 +451,59 @@ done
 [[ ${NEED_ACTION} == "yes" ]] && usage 1
 [[ ${DEBUG} == "yes" ]] && set -x
 
-[[ ${DOIT} != "list_profiles" ]] && set_HOST
-[[ -z ${PROFILE} ]] && PROFILE=${HOST}
-[[ ${PROFILE} == "current" ]] && PROFILE=$(PROFILE=${HOST} get_current_profile)
+# All operations need to know the current HOST to figure out
+# what is a native target and what is a cross target
+set_HOST
+
+# All operations need to know the profile the user wants
+case ${DOIT} in
+switch_profile|switch_linker_*)
+	# decode user's profile choice
+	x=${UARG:-$(TARGET=${HOST} set_current_profile)}
+	PROFILE=""
+	if [[ -z $(echo ${x} | tr -d '[:digit:]') ]] ; then
+		# User gave us a # representing the profile
+		i=1
+		for y in "${ENV_D}"/* ; do
+			[[ ${y/config-} != ${y} ]] && continue
+
+			if [[ -f ${y} ]] && [[ ${x} -eq ${i} ]] ; then
+				PROFILE=${y##*/}
+				break
+			fi
+			((++i))
+		done
+	fi
+
+	if [[ -z ${PROFILE} ]] ; then
+		# User gave us a full HOST-ver
+		x=${x##*/}
+		if [[ -f ${ENV_D}/${x} ]] ; then
+			# Valid HOST-ver yeah!
+			PROFILE=${x}
+		else
+			# Not a valid HOST-ver ...
+			if [[ ! -f ${ENV_D}/config-${x} ]] ; then
+				# Maybe they just gave us a ver ...
+				if [[ -f ${ENV_D}/${HOST}-${x} ]] ; then
+					x=${HOST}-${x}
+				else
+					die "could not locate '$x' in '${ENV_D}/'!"
+				fi
+				PROFILE=${x}
+			else
+				# Maybe they just gave us a target ... pick active profile
+				PROFILE=$(TARGET=${x} set_current_profile)
+			fi
+		fi
+	fi
+	;;
+*)
+	# lookup current profile as the user gave us a target
+	PROFILE=$(TARGET=${UARG:-${HOST}} set_current_profile) || exit 1
+	;;
+esac
+
 eval ${DOIT}
 
 # vim:ts=4
-- 
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