config.guess patch for libid3tag

gistfile1.txt

diff --git a/config.guess b/config.guess
index e8c6fc0..699b3a1 100755
--- a/config.guess
+++ b/config.guess
@@ -1,13 +1,12 @@
 #! /bin/sh
 # Attempt to guess a canonical system name.
-#   Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
-#   2000, 2001, 2002, 2003 Free Software Foundation, Inc.
+#   Copyright 1992-2020 Free Software Foundation, Inc.
 
-timestamp='2004-01-05'
+timestamp='2020-11-19'
 
 # This file is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2 of the License, or
+# the Free Software Foundation; either version 3 of the License, or
 # (at your option) any later version.
 #
 # This program is distributed in the hope that it will be useful, but
@@ -16,33 +15,31 @@ timestamp='2004-01-05'
 # General Public License for more details.
 #
 # You should have received a copy of the GNU General Public License
-# along with this program; if not, write to the Free Software
-# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+# along with this program; if not, see <https://www.gnu.org/licenses/>.
 #
 # As a special exception to the GNU General Public License, if you
 # distribute this file as part of a program that contains a
 # configuration script generated by Autoconf, you may include it under
-# the same distribution terms that you use for the rest of that program.
-
-# Originally written by Per Bothner <[email protected]>.
-# Please send patches to <[email protected]>.  Submit a context
-# diff and a properly formatted ChangeLog entry.
+# the same distribution terms that you use for the rest of that
+# program.  This Exception is an additional permission under section 7
+# of the GNU General Public License, version 3 ("GPLv3").
+#
+# Originally written by Per Bothner; maintained since 2000 by Ben Elliston.
 #
-# This script attempts to guess a canonical system name similar to
-# config.sub.  If it succeeds, it prints the system name on stdout, and
-# exits with 0.  Otherwise, it exits with 1.
+# You can get the latest version of this script from:
+# https://git.savannah.gnu.org/cgit/config.git/plain/config.guess
 #
-# The plan is that this can be called by configure scripts if you
-# don't specify an explicit build system type.
+# Please send patches to <[email protected]>.
+
 
-me=`echo "$0" | sed -e 's,.*/,,'`
+me=$(echo "$0" | sed -e 's,.*/,,')
 
 usage="\
 Usage: $0 [OPTION]
 
 Output the configuration name of the system \`$me' is run on.
 
-Operation modes:
+Options:
   -h, --help         print this help, then exit
   -t, --time-stamp   print date of last modification, then exit
   -v, --version      print version number, then exit
@@ -53,8 +50,7 @@ version="\
 GNU config.guess ($timestamp)
 
 Originally written by Per Bothner.
-Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001
-Free Software Foundation, Inc.
+Copyright 1992-2020 Free Software Foundation, Inc.
 
 This is free software; see the source for copying conditions.  There is NO
 warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE."
@@ -66,11 +62,11 @@ Try \`$me --help' for more information."
 while test $# -gt 0 ; do
   case $1 in
     --time-stamp | --time* | -t )
-       echo "$timestamp" ; exit 0 ;;
+       echo "$timestamp" ; exit ;;
     --version | -v )
-       echo "$version" ; exit 0 ;;
+       echo "$version" ; exit ;;
     --help | --h* | -h )
-       echo "$usage"; exit 0 ;;
+       echo "$usage"; exit ;;
     -- )     # Stop option processing
        shift; break ;;
     - )	# Use stdin as input.
@@ -88,8 +84,6 @@ if test $# != 0; then
   exit 1
 fi
 
-trap 'exit 1' 1 2 15
-
 # CC_FOR_BUILD -- compiler used by this script. Note that the use of a
 # compiler to aid in system detection is discouraged as it requires
 # temporary files to be created and, as you can see below, it is a
@@ -100,48 +94,92 @@ trap 'exit 1' 1 2 15
 
 # Portable tmp directory creation inspired by the Autoconf team.
 
-set_cc_for_build='
-trap "exitcode=\$?; (rm -f \$tmpfiles 2>/dev/null; rmdir \$tmp 2>/dev/null) && exit \$exitcode" 0 ;
-trap "rm -f \$tmpfiles 2>/dev/null; rmdir \$tmp 2>/dev/null; exit 1" 1 2 13 15 ;
-: ${TMPDIR=/tmp} ;
- { tmp=`(umask 077 && mktemp -d -q "$TMPDIR/cgXXXXXX") 2>/dev/null` && test -n "$tmp" && test -d "$tmp" ; } ||
- { test -n "$RANDOM" && tmp=$TMPDIR/cg$$-$RANDOM && (umask 077 && mkdir $tmp) ; } ||
- { tmp=$TMPDIR/cg-$$ && (umask 077 && mkdir $tmp) && echo "Warning: creating insecure temp directory" >&2 ; } ||
- { echo "$me: cannot create a temporary directory in $TMPDIR" >&2 ; exit 1 ; } ;
-dummy=$tmp/dummy ;
-tmpfiles="$dummy.c $dummy.o $dummy.rel $dummy" ;
-case $CC_FOR_BUILD,$HOST_CC,$CC in
- ,,)    echo "int x;" > $dummy.c ;
-	for c in cc gcc c89 c99 ; do
-	  if ($c -c -o $dummy.o $dummy.c) >/dev/null 2>&1 ; then
-	     CC_FOR_BUILD="$c"; break ;
-	  fi ;
-	done ;
-	if test x"$CC_FOR_BUILD" = x ; then
-	  CC_FOR_BUILD=no_compiler_found ;
-	fi
-	;;
- ,,*)   CC_FOR_BUILD=$CC ;;
- ,*,*)  CC_FOR_BUILD=$HOST_CC ;;
-esac ;'
+tmp=
+# shellcheck disable=SC2172
+trap 'test -z "$tmp" || rm -fr "$tmp"' 0 1 2 13 15
+
+set_cc_for_build() {
+    # prevent multiple calls if $tmp is already set
+    test "$tmp" && return 0
+    : "${TMPDIR=/tmp}"
+    # shellcheck disable=SC2039
+    { tmp=$( (umask 077 && mktemp -d "$TMPDIR/cgXXXXXX") 2>/dev/null) && test -n "$tmp" && test -d "$tmp" ; } ||
+	{ test -n "$RANDOM" && tmp=$TMPDIR/cg$$-$RANDOM && (umask 077 && mkdir "$tmp" 2>/dev/null) ; } ||
+	{ tmp=$TMPDIR/cg-$$ && (umask 077 && mkdir "$tmp" 2>/dev/null) && echo "Warning: creating insecure temp directory" >&2 ; } ||
+	{ echo "$me: cannot create a temporary directory in $TMPDIR" >&2 ; exit 1 ; }
+    dummy=$tmp/dummy
+    case ${CC_FOR_BUILD-},${HOST_CC-},${CC-} in
+	,,)    echo "int x;" > "$dummy.c"
+	       for driver in cc gcc c89 c99 ; do
+		   if ($driver -c -o "$dummy.o" "$dummy.c") >/dev/null 2>&1 ; then
+		       CC_FOR_BUILD="$driver"
+		       break
+		   fi
+	       done
+	       if test x"$CC_FOR_BUILD" = x ; then
+		   CC_FOR_BUILD=no_compiler_found
+	       fi
+	       ;;
+	,,*)   CC_FOR_BUILD=$CC ;;
+	,*,*)  CC_FOR_BUILD=$HOST_CC ;;
+    esac
+}
 
 # This is needed to find uname on a Pyramid OSx when run in the BSD universe.
 # ([email protected] 1994-08-24)
-if (test -f /.attbin/uname) >/dev/null 2>&1 ; then
+if test -f /.attbin/uname ; then
 	PATH=$PATH:/.attbin ; export PATH
 fi
 
-UNAME_MACHINE=`(uname -m) 2>/dev/null` || UNAME_MACHINE=unknown
-UNAME_RELEASE=`(uname -r) 2>/dev/null` || UNAME_RELEASE=unknown
-UNAME_SYSTEM=`(uname -s) 2>/dev/null`  || UNAME_SYSTEM=unknown
-UNAME_VERSION=`(uname -v) 2>/dev/null` || UNAME_VERSION=unknown
+UNAME_MACHINE=$( (uname -m) 2>/dev/null) || UNAME_MACHINE=unknown
+UNAME_RELEASE=$( (uname -r) 2>/dev/null) || UNAME_RELEASE=unknown
+UNAME_SYSTEM=$( (uname -s) 2>/dev/null) || UNAME_SYSTEM=unknown
+UNAME_VERSION=$( (uname -v) 2>/dev/null) || UNAME_VERSION=unknown
+
+case "$UNAME_SYSTEM" in
+Linux|GNU|GNU/*)
+	LIBC=unknown
+
+	set_cc_for_build
+	cat <<-EOF > "$dummy.c"
+	#include <features.h>
+	#if defined(__UCLIBC__)
+	LIBC=uclibc
+	#elif defined(__dietlibc__)
+	LIBC=dietlibc
+	#elif defined(__GLIBC__)
+	LIBC=gnu
+	#else
+	#include <stdarg.h>
+	/* First heuristic to detect musl libc.  */
+	#ifdef __DEFINED_va_list
+	LIBC=musl
+	#endif
+	#endif
+	EOF
+	eval "$($CC_FOR_BUILD -E "$dummy.c" 2>/dev/null | grep '^LIBC' | sed 's, ,,g')"
+
+	# Second heuristic to detect musl libc.
+	if [ "$LIBC" = unknown ] &&
+	   command -v ldd >/dev/null &&
+	   ldd --version 2>&1 | grep -q ^musl; then
+		LIBC=musl
+	fi
+
+	# If the system lacks a compiler, then just pick glibc.
+	# We could probably try harder.
+	if [ "$LIBC" = unknown ]; then
+		LIBC=gnu
+	fi
+	;;
+esac
 
 # Note: order is significant - the case branches are not exclusive.
 
-case "${UNAME_MACHINE}:${UNAME_SYSTEM}:${UNAME_RELEASE}:${UNAME_VERSION}" in
+case "$UNAME_MACHINE:$UNAME_SYSTEM:$UNAME_RELEASE:$UNAME_VERSION" in
     *:NetBSD:*:*)
 	# NetBSD (nbsd) targets should (where applicable) match one or
-	# more of the tupples: *-*-netbsdelf*, *-*-netbsdaout*,
+	# more of the tuples: *-*-netbsdelf*, *-*-netbsdaout*,
 	# *-*-netbsdecoff* and *-*-netbsd*.  For targets that recently
 	# switched to ELF, *-*-netbsd* would select the old
 	# object file format.  This provides both forward
@@ -151,22 +189,34 @@ case "${UNAME_MACHINE}:${UNAME_SYSTEM}:${UNAME_RELEASE}:${UNAME_VERSION}" in
 	# Note: NetBSD doesn't particularly care about the vendor
 	# portion of the name.  We always set it to "unknown".
 	sysctl="sysctl -n hw.machine_arch"
-	UNAME_MACHINE_ARCH=`(/sbin/$sysctl 2>/dev/null || \
-	    /usr/sbin/$sysctl 2>/dev/null || echo unknown)`
-	case "${UNAME_MACHINE_ARCH}" in
+	UNAME_MACHINE_ARCH=$( (uname -p 2>/dev/null || \
+	    "/sbin/$sysctl" 2>/dev/null || \
+	    "/usr/sbin/$sysctl" 2>/dev/null || \
+	    echo unknown))
+	case "$UNAME_MACHINE_ARCH" in
+	    aarch64eb) machine=aarch64_be-unknown ;;
 	    armeb) machine=armeb-unknown ;;
 	    arm*) machine=arm-unknown ;;
 	    sh3el) machine=shl-unknown ;;
 	    sh3eb) machine=sh-unknown ;;
-	    *) machine=${UNAME_MACHINE_ARCH}-unknown ;;
+	    sh5el) machine=sh5le-unknown ;;
+	    earmv*)
+		arch=$(echo "$UNAME_MACHINE_ARCH" | sed -e 's,^e\(armv[0-9]\).*$,\1,')
+		endian=$(echo "$UNAME_MACHINE_ARCH" | sed -ne 's,^.*\(eb\)$,\1,p')
+		machine="${arch}${endian}"-unknown
+		;;
+	    *) machine="$UNAME_MACHINE_ARCH"-unknown ;;
 	esac
 	# The Operating System including object format, if it has switched
-	# to ELF recently, or will in the future.
-	case "${UNAME_MACHINE_ARCH}" in
+	# to ELF recently (or will in the future) and ABI.
+	case "$UNAME_MACHINE_ARCH" in
+	    earm*)
+		os=netbsdelf
+		;;
 	    arm*|i386|m68k|ns32k|sh3*|sparc|vax)
-		eval $set_cc_for_build
+		set_cc_for_build
 		if echo __ELF__ | $CC_FOR_BUILD -E - 2>/dev/null \
-			| grep __ELF__ >/dev/null
+			| grep -q __ELF__
 		then
 		    # Once all utilities can be ECOFF (netbsdecoff) or a.out (netbsdaout).
 		    # Return netbsd for either.  FIX?
@@ -176,7 +226,14 @@ case "${UNAME_MACHINE}:${UNAME_SYSTEM}:${UNAME_RELEASE}:${UNAME_VERSION}" in
 		fi
 		;;
 	    *)
-	        os=netbsd
+		os=netbsd
+		;;
+	esac
+	# Determine ABI tags.
+	case "$UNAME_MACHINE_ARCH" in
+	    earm*)
+		expr='s/^earmv[0-9]/-eabi/;s/eb$//'
+		abi=$(echo "$UNAME_MACHINE_ARCH" | sed -e "$expr")
 		;;
 	esac
 	# The OS release
@@ -184,201 +241,223 @@ case "${UNAME_MACHINE}:${UNAME_SYSTEM}:${UNAME_RELEASE}:${UNAME_VERSION}" in
 	# thus, need a distinct triplet. However, they do not need
 	# kernel version information, so it can be replaced with a
 	# suitable tag, in the style of linux-gnu.
-	case "${UNAME_VERSION}" in
+	case "$UNAME_VERSION" in
 	    Debian*)
 		release='-gnu'
 		;;
 	    *)
-		release=`echo ${UNAME_RELEASE}|sed -e 's/[-_].*/\./'`
+		release=$(echo "$UNAME_RELEASE" | sed -e 's/[-_].*//' | cut -d. -f1,2)
 		;;
 	esac
 	# Since CPU_TYPE-MANUFACTURER-KERNEL-OPERATING_SYSTEM:
 	# contains redundant information, the shorter form:
 	# CPU_TYPE-MANUFACTURER-OPERATING_SYSTEM is used.
-	echo "${machine}-${os}${release}"
-	exit 0 ;;
-    amiga:OpenBSD:*:*)
-	echo m68k-unknown-openbsd${UNAME_RELEASE}
-	exit 0 ;;
-    arc:OpenBSD:*:*)
-	echo mipsel-unknown-openbsd${UNAME_RELEASE}
-	exit 0 ;;
-    hp300:OpenBSD:*:*)
-	echo m68k-unknown-openbsd${UNAME_RELEASE}
-	exit 0 ;;
-    mac68k:OpenBSD:*:*)
-	echo m68k-unknown-openbsd${UNAME_RELEASE}
-	exit 0 ;;
-    macppc:OpenBSD:*:*)
-	echo powerpc-unknown-openbsd${UNAME_RELEASE}
-	exit 0 ;;
-    mvme68k:OpenBSD:*:*)
-	echo m68k-unknown-openbsd${UNAME_RELEASE}
-	exit 0 ;;
-    mvme88k:OpenBSD:*:*)
-	echo m88k-unknown-openbsd${UNAME_RELEASE}
-	exit 0 ;;
-    mvmeppc:OpenBSD:*:*)
-	echo powerpc-unknown-openbsd${UNAME_RELEASE}
-	exit 0 ;;
-    pegasos:OpenBSD:*:*)
-	echo powerpc-unknown-openbsd${UNAME_RELEASE}
-	exit 0 ;;
-    pmax:OpenBSD:*:*)
-	echo mipsel-unknown-openbsd${UNAME_RELEASE}
-	exit 0 ;;
-    sgi:OpenBSD:*:*)
-	echo mipseb-unknown-openbsd${UNAME_RELEASE}
-	exit 0 ;;
-    sun3:OpenBSD:*:*)
-	echo m68k-unknown-openbsd${UNAME_RELEASE}
-	exit 0 ;;
-    wgrisc:OpenBSD:*:*)
-	echo mipsel-unknown-openbsd${UNAME_RELEASE}
-	exit 0 ;;
+	echo "$machine-${os}${release}${abi-}"
+	exit ;;
+    *:Bitrig:*:*)
+	UNAME_MACHINE_ARCH=$(arch | sed 's/Bitrig.//')
+	echo "$UNAME_MACHINE_ARCH"-unknown-bitrig"$UNAME_RELEASE"
+	exit ;;
     *:OpenBSD:*:*)
-	echo ${UNAME_MACHINE}-unknown-openbsd${UNAME_RELEASE}
-	exit 0 ;;
+	UNAME_MACHINE_ARCH=$(arch | sed 's/OpenBSD.//')
+	echo "$UNAME_MACHINE_ARCH"-unknown-openbsd"$UNAME_RELEASE"
+	exit ;;
+    *:LibertyBSD:*:*)
+	UNAME_MACHINE_ARCH=$(arch | sed 's/^.*BSD\.//')
+	echo "$UNAME_MACHINE_ARCH"-unknown-libertybsd"$UNAME_RELEASE"
+	exit ;;
+    *:MidnightBSD:*:*)
+	echo "$UNAME_MACHINE"-unknown-midnightbsd"$UNAME_RELEASE"
+	exit ;;
+    *:ekkoBSD:*:*)
+	echo "$UNAME_MACHINE"-unknown-ekkobsd"$UNAME_RELEASE"
+	exit ;;
+    *:SolidBSD:*:*)
+	echo "$UNAME_MACHINE"-unknown-solidbsd"$UNAME_RELEASE"
+	exit ;;
+    *:OS108:*:*)
+	echo "$UNAME_MACHINE"-unknown-os108_"$UNAME_RELEASE"
+	exit ;;
+    macppc:MirBSD:*:*)
+	echo powerpc-unknown-mirbsd"$UNAME_RELEASE"
+	exit ;;
+    *:MirBSD:*:*)
+	echo "$UNAME_MACHINE"-unknown-mirbsd"$UNAME_RELEASE"
+	exit ;;
+    *:Sortix:*:*)
+	echo "$UNAME_MACHINE"-unknown-sortix
+	exit ;;
+    *:Twizzler:*:*)
+	echo "$UNAME_MACHINE"-unknown-twizzler
+	exit ;;
+    *:Redox:*:*)
+	echo "$UNAME_MACHINE"-unknown-redox
+	exit ;;
+    mips:OSF1:*.*)
+	echo mips-dec-osf1
+	exit ;;
     alpha:OSF1:*:*)
-	if test $UNAME_RELEASE = "V4.0"; then
-		UNAME_RELEASE=`/usr/sbin/sizer -v | awk '{print $3}'`
-	fi
+	case $UNAME_RELEASE in
+	*4.0)
+		UNAME_RELEASE=$(/usr/sbin/sizer -v | awk '{print $3}')
+		;;
+	*5.*)
+		UNAME_RELEASE=$(/usr/sbin/sizer -v | awk '{print $4}')
+		;;
+	esac
 	# According to Compaq, /usr/sbin/psrinfo has been available on
 	# OSF/1 and Tru64 systems produced since 1995.  I hope that
 	# covers most systems running today.  This code pipes the CPU
 	# types through head -n 1, so we only detect the type of CPU 0.
-	ALPHA_CPU_TYPE=`/usr/sbin/psrinfo -v | sed -n -e 's/^  The alpha \(.*\) processor.*$/\1/p' | head -n 1`
+	ALPHA_CPU_TYPE=$(/usr/sbin/psrinfo -v | sed -n -e 's/^  The alpha \(.*\) processor.*$/\1/p' | head -n 1)
 	case "$ALPHA_CPU_TYPE" in
 	    "EV4 (21064)")
-		UNAME_MACHINE="alpha" ;;
+		UNAME_MACHINE=alpha ;;
 	    "EV4.5 (21064)")
-		UNAME_MACHINE="alpha" ;;
+		UNAME_MACHINE=alpha ;;
 	    "LCA4 (21066/21068)")
-		UNAME_MACHINE="alpha" ;;
+		UNAME_MACHINE=alpha ;;
 	    "EV5 (21164)")
-		UNAME_MACHINE="alphaev5" ;;
+		UNAME_MACHINE=alphaev5 ;;
 	    "EV5.6 (21164A)")
-		UNAME_MACHINE="alphaev56" ;;
+		UNAME_MACHINE=alphaev56 ;;
 	    "EV5.6 (21164PC)")
-		UNAME_MACHINE="alphapca56" ;;
+		UNAME_MACHINE=alphapca56 ;;
 	    "EV5.7 (21164PC)")
-		UNAME_MACHINE="alphapca57" ;;
+		UNAME_MACHINE=alphapca57 ;;
 	    "EV6 (21264)")
-		UNAME_MACHINE="alphaev6" ;;
+		UNAME_MACHINE=alphaev6 ;;
 	    "EV6.7 (21264A)")
-		UNAME_MACHINE="alphaev67" ;;
+		UNAME_MACHINE=alphaev67 ;;
 	    "EV6.8CB (21264C)")
-		UNAME_MACHINE="alphaev68" ;;
+		UNAME_MACHINE=alphaev68 ;;
 	    "EV6.8AL (21264B)")
-		UNAME_MACHINE="alphaev68" ;;
+		UNAME_MACHINE=alphaev68 ;;
 	    "EV6.8CX (21264D)")
-		UNAME_MACHINE="alphaev68" ;;
+		UNAME_MACHINE=alphaev68 ;;
 	    "EV6.9A (21264/EV69A)")
-		UNAME_MACHINE="alphaev69" ;;
+		UNAME_MACHINE=alphaev69 ;;
 	    "EV7 (21364)")
-		UNAME_MACHINE="alphaev7" ;;
+		UNAME_MACHINE=alphaev7 ;;
 	    "EV7.9 (21364A)")
-		UNAME_MACHINE="alphaev79" ;;
+		UNAME_MACHINE=alphaev79 ;;
 	esac
+	# A Pn.n version is a patched version.
 	# A Vn.n version is a released version.
 	# A Tn.n version is a released field test version.
 	# A Xn.n version is an unreleased experimental baselevel.
 	# 1.2 uses "1.2" for uname -r.
-	echo ${UNAME_MACHINE}-dec-osf`echo ${UNAME_RELEASE} | sed -e 's/^[VTX]//' | tr 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' 'abcdefghijklmnopqrstuvwxyz'`
-	exit 0 ;;
-    Alpha*:OpenVMS:*:*)
-	echo alpha-hp-vms
-	exit 0 ;;
-    Alpha\ *:Windows_NT*:*)
-	# How do we know it's Interix rather than the generic POSIX subsystem?
-	# Should we change UNAME_MACHINE based on the output of uname instead
-	# of the specific Alpha model?
-	echo alpha-pc-interix
-	exit 0 ;;
-    21064:Windows_NT:50:3)
-	echo alpha-dec-winnt3.5
-	exit 0 ;;
+	echo "$UNAME_MACHINE"-dec-osf"$(echo "$UNAME_RELEASE" | sed -e 's/^[PVTX]//' | tr ABCDEFGHIJKLMNOPQRSTUVWXYZ abcdefghijklmnopqrstuvwxyz)"
+	# Reset EXIT trap before exiting to avoid spurious non-zero exit code.
+	exitcode=$?
+	trap '' 0
+	exit $exitcode ;;
     Amiga*:UNIX_System_V:4.0:*)
 	echo m68k-unknown-sysv4
-	exit 0;;
+	exit ;;
     *:[Aa]miga[Oo][Ss]:*:*)
-	echo ${UNAME_MACHINE}-unknown-amigaos
-	exit 0 ;;
+	echo "$UNAME_MACHINE"-unknown-amigaos
+	exit ;;
     *:[Mm]orph[Oo][Ss]:*:*)
-	echo ${UNAME_MACHINE}-unknown-morphos
-	exit 0 ;;
+	echo "$UNAME_MACHINE"-unknown-morphos
+	exit ;;
     *:OS/390:*:*)
 	echo i370-ibm-openedition
-	exit 0 ;;
+	exit ;;
+    *:z/VM:*:*)
+	echo s390-ibm-zvmoe
+	exit ;;
     *:OS400:*:*)
-        echo powerpc-ibm-os400
-	exit 0 ;;
+	echo powerpc-ibm-os400
+	exit ;;
     arm:RISC*:1.[012]*:*|arm:riscix:1.[012]*:*)
-	echo arm-acorn-riscix${UNAME_RELEASE}
-	exit 0;;
+	echo arm-acorn-riscix"$UNAME_RELEASE"
+	exit ;;
+    arm*:riscos:*:*|arm*:RISCOS:*:*)
+	echo arm-unknown-riscos
+	exit ;;
     SR2?01:HI-UX/MPP:*:* | SR8000:HI-UX/MPP:*:*)
 	echo hppa1.1-hitachi-hiuxmpp
-	exit 0;;
+	exit ;;
     Pyramid*:OSx*:*:* | MIS*:OSx*:*:* | MIS*:SMP_DC-OSx*:*:*)
 	# [email protected] (Earle F. Ake) contributed MIS and NILE.
-	if test "`(/bin/universe) 2>/dev/null`" = att ; then
+	if test "$( (/bin/universe) 2>/dev/null)" = att ; then
 		echo pyramid-pyramid-sysv3
 	else
 		echo pyramid-pyramid-bsd
 	fi
-	exit 0 ;;
+	exit ;;
     NILE*:*:*:dcosx)
 	echo pyramid-pyramid-svr4
-	exit 0 ;;
+	exit ;;
     DRS?6000:unix:4.0:6*)
 	echo sparc-icl-nx6
-	exit 0 ;;
-    DRS?6000:UNIX_SV:4.2*:7*)
-	case `/usr/bin/uname -p` in
-	    sparc) echo sparc-icl-nx7 && exit 0 ;;
+	exit ;;
+    DRS?6000:UNIX_SV:4.2*:7* | DRS?6000:isis:4.2*:7*)
+	case $(/usr/bin/uname -p) in
+	    sparc) echo sparc-icl-nx7; exit ;;
 	esac ;;
+    s390x:SunOS:*:*)
+	echo "$UNAME_MACHINE"-ibm-solaris2"$(echo "$UNAME_RELEASE" | sed -e 's/[^.]*//')"
+	exit ;;
     sun4H:SunOS:5.*:*)
-	echo sparc-hal-solaris2`echo ${UNAME_RELEASE}|sed -e 's/[^.]*//'`
-	exit 0 ;;
+	echo sparc-hal-solaris2"$(echo "$UNAME_RELEASE"|sed -e 's/[^.]*//')"
+	exit ;;
     sun4*:SunOS:5.*:* | tadpole*:SunOS:5.*:*)
-	echo sparc-sun-solaris2`echo ${UNAME_RELEASE}|sed -e 's/[^.]*//'`
-	exit 0 ;;
-    i86pc:SunOS:5.*:*)
-	echo i386-pc-solaris2`echo ${UNAME_RELEASE}|sed -e 's/[^.]*//'`
-	exit 0 ;;
+	echo sparc-sun-solaris2"$(echo "$UNAME_RELEASE" | sed -e 's/[^.]*//')"
+	exit ;;
+    i86pc:AuroraUX:5.*:* | i86xen:AuroraUX:5.*:*)
+	echo i386-pc-auroraux"$UNAME_RELEASE"
+	exit ;;
+    i86pc:SunOS:5.*:* | i86xen:SunOS:5.*:*)
+	set_cc_for_build
+	SUN_ARCH=i386
+	# If there is a compiler, see if it is configured for 64-bit objects.
+	# Note that the Sun cc does not turn __LP64__ into 1 like gcc does.
+	# This test works for both compilers.
+	if test "$CC_FOR_BUILD" != no_compiler_found; then
+	    if (echo '#ifdef __amd64'; echo IS_64BIT_ARCH; echo '#endif') | \
+		(CCOPTS="" $CC_FOR_BUILD -E - 2>/dev/null) | \
+		grep IS_64BIT_ARCH >/dev/null
+	    then
+		SUN_ARCH=x86_64
+	    fi
+	fi
+	echo "$SUN_ARCH"-pc-solaris2"$(echo "$UNAME_RELEASE"|sed -e 's/[^.]*//')"
+	exit ;;
     sun4*:SunOS:6*:*)
 	# According to config.sub, this is the proper way to canonicalize
 	# SunOS6.  Hard to guess exactly what SunOS6 will be like, but
 	# it's likely to be more like Solaris than SunOS4.
-	echo sparc-sun-solaris3`echo ${UNAME_RELEASE}|sed -e 's/[^.]*//'`
-	exit 0 ;;
+	echo sparc-sun-solaris3"$(echo "$UNAME_RELEASE"|sed -e 's/[^.]*//')"
+	exit ;;
     sun4*:SunOS:*:*)
-	case "`/usr/bin/arch -k`" in
+	case "$(/usr/bin/arch -k)" in
 	    Series*|S4*)
-		UNAME_RELEASE=`uname -v`
+		UNAME_RELEASE=$(uname -v)
 		;;
 	esac
 	# Japanese Language versions have a version number like `4.1.3-JL'.
-	echo sparc-sun-sunos`echo ${UNAME_RELEASE}|sed -e 's/-/_/'`
-	exit 0 ;;
+	echo sparc-sun-sunos"$(echo "$UNAME_RELEASE"|sed -e 's/-/_/')"
+	exit ;;
     sun3*:SunOS:*:*)
-	echo m68k-sun-sunos${UNAME_RELEASE}
-	exit 0 ;;
+	echo m68k-sun-sunos"$UNAME_RELEASE"
+	exit ;;
     sun*:*:4.2BSD:*)
-	UNAME_RELEASE=`(sed 1q /etc/motd | awk '{print substr($5,1,3)}') 2>/dev/null`
-	test "x${UNAME_RELEASE}" = "x" && UNAME_RELEASE=3
-	case "`/bin/arch`" in
+	UNAME_RELEASE=$( (sed 1q /etc/motd | awk '{print substr($5,1,3)}') 2>/dev/null)
+	test "x$UNAME_RELEASE" = x && UNAME_RELEASE=3
+	case "$(/bin/arch)" in
 	    sun3)
-		echo m68k-sun-sunos${UNAME_RELEASE}
+		echo m68k-sun-sunos"$UNAME_RELEASE"
 		;;
 	    sun4)
-		echo sparc-sun-sunos${UNAME_RELEASE}
+		echo sparc-sun-sunos"$UNAME_RELEASE"
 		;;
 	esac
-	exit 0 ;;
+	exit ;;
     aushp:SunOS:*:*)
-	echo sparc-auspex-sunos${UNAME_RELEASE}
-	exit 0 ;;
+	echo sparc-auspex-sunos"$UNAME_RELEASE"
+	exit ;;
     # The situation for MiNT is a little confusing.  The machine name
     # can be virtually everything (everything which is not
     # "atarist" or "atariste" at least should have a processor
@@ -388,41 +467,44 @@ case "${UNAME_MACHINE}:${UNAME_SYSTEM}:${UNAME_RELEASE}:${UNAME_VERSION}" in
     # MiNT.  But MiNT is downward compatible to TOS, so this should
     # be no problem.
     atarist[e]:*MiNT:*:* | atarist[e]:*mint:*:* | atarist[e]:*TOS:*:*)
-        echo m68k-atari-mint${UNAME_RELEASE}
-	exit 0 ;;
+	echo m68k-atari-mint"$UNAME_RELEASE"
+	exit ;;
     atari*:*MiNT:*:* | atari*:*mint:*:* | atarist[e]:*TOS:*:*)
-	echo m68k-atari-mint${UNAME_RELEASE}
-        exit 0 ;;
+	echo m68k-atari-mint"$UNAME_RELEASE"
+	exit ;;
     *falcon*:*MiNT:*:* | *falcon*:*mint:*:* | *falcon*:*TOS:*:*)
-        echo m68k-atari-mint${UNAME_RELEASE}
-	exit 0 ;;
+	echo m68k-atari-mint"$UNAME_RELEASE"
+	exit ;;
     milan*:*MiNT:*:* | milan*:*mint:*:* | *milan*:*TOS:*:*)
-        echo m68k-milan-mint${UNAME_RELEASE}
-        exit 0 ;;
+	echo m68k-milan-mint"$UNAME_RELEASE"
+	exit ;;
     hades*:*MiNT:*:* | hades*:*mint:*:* | *hades*:*TOS:*:*)
-        echo m68k-hades-mint${UNAME_RELEASE}
-        exit 0 ;;
+	echo m68k-hades-mint"$UNAME_RELEASE"
+	exit ;;
     *:*MiNT:*:* | *:*mint:*:* | *:*TOS:*:*)
-        echo m68k-unknown-mint${UNAME_RELEASE}
-        exit 0 ;;
+	echo m68k-unknown-mint"$UNAME_RELEASE"
+	exit ;;
+    m68k:machten:*:*)
+	echo m68k-apple-machten"$UNAME_RELEASE"
+	exit ;;
     powerpc:machten:*:*)
-	echo powerpc-apple-machten${UNAME_RELEASE}
-	exit 0 ;;
+	echo powerpc-apple-machten"$UNAME_RELEASE"
+	exit ;;
     RISC*:Mach:*:*)
 	echo mips-dec-mach_bsd4.3
-	exit 0 ;;
+	exit ;;
     RISC*:ULTRIX:*:*)
-	echo mips-dec-ultrix${UNAME_RELEASE}
-	exit 0 ;;
+	echo mips-dec-ultrix"$UNAME_RELEASE"
+	exit ;;
     VAX*:ULTRIX*:*:*)
-	echo vax-dec-ultrix${UNAME_RELEASE}
-	exit 0 ;;
+	echo vax-dec-ultrix"$UNAME_RELEASE"
+	exit ;;
     2020:CLIX:*:* | 2430:CLIX:*:*)
-	echo clipper-intergraph-clix${UNAME_RELEASE}
-	exit 0 ;;
+	echo clipper-intergraph-clix"$UNAME_RELEASE"
+	exit ;;
     mips:*:*:UMIPS | mips:*:*:RISCos)
-	eval $set_cc_for_build
-	sed 's/^	//' << EOF >$dummy.c
+	set_cc_for_build
+	sed 's/^	//' << EOF > "$dummy.c"
 #ifdef __cplusplus
 #include <stdio.h>  /* for printf() prototype */
 	int main (int argc, char *argv[]) {
@@ -431,94 +513,95 @@ case "${UNAME_MACHINE}:${UNAME_SYSTEM}:${UNAME_RELEASE}:${UNAME_VERSION}" in
 #endif
 	#if defined (host_mips) && defined (MIPSEB)
 	#if defined (SYSTYPE_SYSV)
-	  printf ("mips-mips-riscos%ssysv\n", argv[1]); exit (0);
+	  printf ("mips-mips-riscos%ssysv\\n", argv[1]); exit (0);
 	#endif
 	#if defined (SYSTYPE_SVR4)
-	  printf ("mips-mips-riscos%ssvr4\n", argv[1]); exit (0);
+	  printf ("mips-mips-riscos%ssvr4\\n", argv[1]); exit (0);
 	#endif
 	#if defined (SYSTYPE_BSD43) || defined(SYSTYPE_BSD)
-	  printf ("mips-mips-riscos%sbsd\n", argv[1]); exit (0);
+	  printf ("mips-mips-riscos%sbsd\\n", argv[1]); exit (0);
 	#endif
 	#endif
 	  exit (-1);
 	}
 EOF
-	$CC_FOR_BUILD -o $dummy $dummy.c \
-	  && $dummy `echo "${UNAME_RELEASE}" | sed -n 's/\([0-9]*\).*/\1/p'` \
-	  && exit 0
-	echo mips-mips-riscos${UNAME_RELEASE}
-	exit 0 ;;
+	$CC_FOR_BUILD -o "$dummy" "$dummy.c" &&
+	  dummyarg=$(echo "$UNAME_RELEASE" | sed -n 's/\([0-9]*\).*/\1/p') &&
+	  SYSTEM_NAME=$("$dummy" "$dummyarg") &&
+	    { echo "$SYSTEM_NAME"; exit; }
+	echo mips-mips-riscos"$UNAME_RELEASE"
+	exit ;;
     Motorola:PowerMAX_OS:*:*)
 	echo powerpc-motorola-powermax
-	exit 0 ;;
+	exit ;;
     Motorola:*:4.3:PL8-*)
 	echo powerpc-harris-powermax
-	exit 0 ;;
+	exit ;;
     Night_Hawk:*:*:PowerMAX_OS | Synergy:PowerMAX_OS:*:*)
 	echo powerpc-harris-powermax
-	exit 0 ;;
+	exit ;;
     Night_Hawk:Power_UNIX:*:*)
 	echo powerpc-harris-powerunix
-	exit 0 ;;
+	exit ;;
     m88k:CX/UX:7*:*)
 	echo m88k-harris-cxux7
-	exit 0 ;;
+	exit ;;
     m88k:*:4*:R4*)
 	echo m88k-motorola-sysv4
-	exit 0 ;;
+	exit ;;
     m88k:*:3*:R3*)
 	echo m88k-motorola-sysv3
-	exit 0 ;;
+	exit ;;
     AViiON:dgux:*:*)
-        # DG/UX returns AViiON for all architectures
-        UNAME_PROCESSOR=`/usr/bin/uname -p`
-	if [ $UNAME_PROCESSOR = mc88100 ] || [ $UNAME_PROCESSOR = mc88110 ]
+	# DG/UX returns AViiON for all architectures
+	UNAME_PROCESSOR=$(/usr/bin/uname -p)
+	if test "$UNAME_PROCESSOR" = mc88100 || test "$UNAME_PROCESSOR" = mc88110
 	then
-	    if [ ${TARGET_BINARY_INTERFACE}x = m88kdguxelfx ] || \
-	       [ ${TARGET_BINARY_INTERFACE}x = x ]
+	    if test "$TARGET_BINARY_INTERFACE"x = m88kdguxelfx || \
+	       test "$TARGET_BINARY_INTERFACE"x = x
 	    then
-		echo m88k-dg-dgux${UNAME_RELEASE}
+		echo m88k-dg-dgux"$UNAME_RELEASE"
 	    else
-		echo m88k-dg-dguxbcs${UNAME_RELEASE}
+		echo m88k-dg-dguxbcs"$UNAME_RELEASE"
 	    fi
 	else
-	    echo i586-dg-dgux${UNAME_RELEASE}
+	    echo i586-dg-dgux"$UNAME_RELEASE"
 	fi
- 	exit 0 ;;
+	exit ;;
     M88*:DolphinOS:*:*)	# DolphinOS (SVR3)
 	echo m88k-dolphin-sysv3
-	exit 0 ;;
+	exit ;;
     M88*:*:R3*:*)
 	# Delta 88k system running SVR3
 	echo m88k-motorola-sysv3
-	exit 0 ;;
+	exit ;;
     XD88*:*:*:*) # Tektronix XD88 system running UTekV (SVR3)
 	echo m88k-tektronix-sysv3
-	exit 0 ;;
+	exit ;;
     Tek43[0-9][0-9]:UTek:*:*) # Tektronix 4300 system running UTek (BSD)
 	echo m68k-tektronix-bsd
-	exit 0 ;;
+	exit ;;
     *:IRIX*:*:*)
-	echo mips-sgi-irix`echo ${UNAME_RELEASE}|sed -e 's/-/_/g'`
-	exit 0 ;;
+	echo mips-sgi-irix"$(echo "$UNAME_RELEASE"|sed -e 's/-/_/g')"
+	exit ;;
     ????????:AIX?:[12].1:2)   # AIX 2.2.1 or AIX 2.1.1 is RT/PC AIX.
-	echo romp-ibm-aix      # uname -m gives an 8 hex-code CPU id
-	exit 0 ;;              # Note that: echo "'`uname -s`'" gives 'AIX '
+	echo romp-ibm-aix     # uname -m gives an 8 hex-code CPU id
+	exit ;;               # Note that: echo "'$(uname -s)'" gives 'AIX '
     i*86:AIX:*:*)
 	echo i386-ibm-aix
-	exit 0 ;;
+	exit ;;
     ia64:AIX:*:*)
-	if [ -x /usr/bin/oslevel ] ; then
-		IBM_REV=`/usr/bin/oslevel`
+	if test -x /usr/bin/oslevel ; then
+		IBM_REV=$(/usr/bin/oslevel)
 	else
-		IBM_REV=${UNAME_VERSION}.${UNAME_RELEASE}
+		IBM_REV="$UNAME_VERSION.$UNAME_RELEASE"
 	fi
-	echo ${UNAME_MACHINE}-ibm-aix${IBM_REV}
-	exit 0 ;;
+	echo "$UNAME_MACHINE"-ibm-aix"$IBM_REV"
+	exit ;;
     *:AIX:2:3)
 	if grep bos325 /usr/include/stdio.h >/dev/null 2>&1; then
-		eval $set_cc_for_build
-		sed 's/^		//' << EOF >$dummy.c
+		set_cc_for_build
+		sed 's/^		//' << EOF > "$dummy.c"
 		#include <sys/systemcfg.h>
 
 		main()
@@ -529,128 +612,143 @@ EOF
 			exit(0);
 			}
 EOF
-		$CC_FOR_BUILD -o $dummy $dummy.c && $dummy && exit 0
-		echo rs6000-ibm-aix3.2.5
+		if $CC_FOR_BUILD -o "$dummy" "$dummy.c" && SYSTEM_NAME=$("$dummy")
+		then
+			echo "$SYSTEM_NAME"
+		else
+			echo rs6000-ibm-aix3.2.5
+		fi
 	elif grep bos324 /usr/include/stdio.h >/dev/null 2>&1; then
 		echo rs6000-ibm-aix3.2.4
 	else
 		echo rs6000-ibm-aix3.2
 	fi
-	exit 0 ;;
-    *:AIX:*:[45])
-	IBM_CPU_ID=`/usr/sbin/lsdev -C -c processor -S available | sed 1q | awk '{ print $1 }'`
-	if /usr/sbin/lsattr -El ${IBM_CPU_ID} | grep ' POWER' >/dev/null 2>&1; then
+	exit ;;
+    *:AIX:*:[4567])
+	IBM_CPU_ID=$(/usr/sbin/lsdev -C -c processor -S available | sed 1q | awk '{ print $1 }')
+	if /usr/sbin/lsattr -El "$IBM_CPU_ID" | grep ' POWER' >/dev/null 2>&1; then
 		IBM_ARCH=rs6000
 	else
 		IBM_ARCH=powerpc
 	fi
-	if [ -x /usr/bin/oslevel ] ; then
-		IBM_REV=`/usr/bin/oslevel`
+	if test -x /usr/bin/lslpp ; then
+		IBM_REV=$(/usr/bin/lslpp -Lqc bos.rte.libc |
+			   awk -F: '{ print $3 }' | sed s/[0-9]*$/0/)
 	else
-		IBM_REV=${UNAME_VERSION}.${UNAME_RELEASE}
+		IBM_REV="$UNAME_VERSION.$UNAME_RELEASE"
 	fi
-	echo ${IBM_ARCH}-ibm-aix${IBM_REV}
-	exit 0 ;;
+	echo "$IBM_ARCH"-ibm-aix"$IBM_REV"
+	exit ;;
     *:AIX:*:*)
 	echo rs6000-ibm-aix
-	exit 0 ;;
-    ibmrt:4.4BSD:*|romp-ibm:BSD:*)
+	exit ;;
+    ibmrt:4.4BSD:*|romp-ibm:4.4BSD:*)
 	echo romp-ibm-bsd4.4
-	exit 0 ;;
+	exit ;;
     ibmrt:*BSD:*|romp-ibm:BSD:*)            # covers RT/PC BSD and
-	echo romp-ibm-bsd${UNAME_RELEASE}   # 4.3 with uname added to
-	exit 0 ;;                           # report: romp-ibm BSD 4.3
+	echo romp-ibm-bsd"$UNAME_RELEASE"   # 4.3 with uname added to
+	exit ;;                             # report: romp-ibm BSD 4.3
     *:BOSX:*:*)
 	echo rs6000-bull-bosx
-	exit 0 ;;
+	exit ;;
     DPX/2?00:B.O.S.:*:*)
 	echo m68k-bull-sysv3
-	exit 0 ;;
+	exit ;;
     9000/[34]??:4.3bsd:1.*:*)
 	echo m68k-hp-bsd
-	exit 0 ;;
+	exit ;;
     hp300:4.4BSD:*:* | 9000/[34]??:4.3bsd:2.*:*)
 	echo m68k-hp-bsd4.4
-	exit 0 ;;
+	exit ;;
     9000/[34678]??:HP-UX:*:*)
-	HPUX_REV=`echo ${UNAME_RELEASE}|sed -e 's/[^.]*.[0B]*//'`
-	case "${UNAME_MACHINE}" in
-	    9000/31? )            HP_ARCH=m68000 ;;
-	    9000/[34]?? )         HP_ARCH=m68k ;;
+	HPUX_REV=$(echo "$UNAME_RELEASE"|sed -e 's/[^.]*.[0B]*//')
+	case "$UNAME_MACHINE" in
+	    9000/31?)            HP_ARCH=m68000 ;;
+	    9000/[34]??)         HP_ARCH=m68k ;;
 	    9000/[678][0-9][0-9])
-		if [ -x /usr/bin/getconf ]; then
-		    sc_cpu_version=`/usr/bin/getconf SC_CPU_VERSION 2>/dev/null`
-                    sc_kernel_bits=`/usr/bin/getconf SC_KERNEL_BITS 2>/dev/null`
-                    case "${sc_cpu_version}" in
-                      523) HP_ARCH="hppa1.0" ;; # CPU_PA_RISC1_0
-                      528) HP_ARCH="hppa1.1" ;; # CPU_PA_RISC1_1
-                      532)                      # CPU_PA_RISC2_0
-                        case "${sc_kernel_bits}" in
-                          32) HP_ARCH="hppa2.0n" ;;
-                          64) HP_ARCH="hppa2.0w" ;;
-			  '') HP_ARCH="hppa2.0" ;;   # HP-UX 10.20
-                        esac ;;
-                    esac
+		if test -x /usr/bin/getconf; then
+		    sc_cpu_version=$(/usr/bin/getconf SC_CPU_VERSION 2>/dev/null)
+		    sc_kernel_bits=$(/usr/bin/getconf SC_KERNEL_BITS 2>/dev/null)
+		    case "$sc_cpu_version" in
+		      523) HP_ARCH=hppa1.0 ;; # CPU_PA_RISC1_0
+		      528) HP_ARCH=hppa1.1 ;; # CPU_PA_RISC1_1
+		      532)                      # CPU_PA_RISC2_0
+			case "$sc_kernel_bits" in
+			  32) HP_ARCH=hppa2.0n ;;
+			  64) HP_ARCH=hppa2.0w ;;
+			  '') HP_ARCH=hppa2.0 ;;   # HP-UX 10.20
+			esac ;;
+		    esac
 		fi
-		if [ "${HP_ARCH}" = "" ]; then
-		    eval $set_cc_for_build
-		    sed 's/^              //' << EOF >$dummy.c
+		if test "$HP_ARCH" = ""; then
+		    set_cc_for_build
+		    sed 's/^		//' << EOF > "$dummy.c"
 
-              #define _HPUX_SOURCE
-              #include <stdlib.h>
-              #include <unistd.h>
+		#define _HPUX_SOURCE
+		#include <stdlib.h>
+		#include <unistd.h>
 
-              int main ()
-              {
-              #if defined(_SC_KERNEL_BITS)
-                  long bits = sysconf(_SC_KERNEL_BITS);
-              #endif
-                  long cpu  = sysconf (_SC_CPU_VERSION);
+		int main ()
+		{
+		#if defined(_SC_KERNEL_BITS)
+		    long bits = sysconf(_SC_KERNEL_BITS);
+		#endif
+		    long cpu  = sysconf (_SC_CPU_VERSION);
 
-                  switch (cpu)
-              	{
-              	case CPU_PA_RISC1_0: puts ("hppa1.0"); break;
-              	case CPU_PA_RISC1_1: puts ("hppa1.1"); break;
-              	case CPU_PA_RISC2_0:
-              #if defined(_SC_KERNEL_BITS)
-              	    switch (bits)
-              		{
-              		case 64: puts ("hppa2.0w"); break;
-              		case 32: puts ("hppa2.0n"); break;
-              		default: puts ("hppa2.0"); break;
-              		} break;
-              #else  /* !defined(_SC_KERNEL_BITS) */
-              	    puts ("hppa2.0"); break;
-              #endif
-              	default: puts ("hppa1.0"); break;
-              	}
-                  exit (0);
-              }
+		    switch (cpu)
+			{
+			case CPU_PA_RISC1_0: puts ("hppa1.0"); break;
+			case CPU_PA_RISC1_1: puts ("hppa1.1"); break;
+			case CPU_PA_RISC2_0:
+		#if defined(_SC_KERNEL_BITS)
+			    switch (bits)
+				{
+				case 64: puts ("hppa2.0w"); break;
+				case 32: puts ("hppa2.0n"); break;
+				default: puts ("hppa2.0"); break;
+				} break;
+		#else  /* !defined(_SC_KERNEL_BITS) */
+			    puts ("hppa2.0"); break;
+		#endif
+			default: puts ("hppa1.0"); break;
+			}
+		    exit (0);
+		}
 EOF
-		    (CCOPTS= $CC_FOR_BUILD -o $dummy $dummy.c 2>/dev/null) && HP_ARCH=`$dummy`
+		    (CCOPTS="" $CC_FOR_BUILD -o "$dummy" "$dummy.c" 2>/dev/null) && HP_ARCH=$("$dummy")
 		    test -z "$HP_ARCH" && HP_ARCH=hppa
 		fi ;;
 	esac
-	if [ ${HP_ARCH} = "hppa2.0w" ]
+	if test "$HP_ARCH" = hppa2.0w
 	then
-	    # avoid double evaluation of $set_cc_for_build
-	    test -n "$CC_FOR_BUILD" || eval $set_cc_for_build
-	    if echo __LP64__ | (CCOPTS= $CC_FOR_BUILD -E -) | grep __LP64__ >/dev/null
+	    set_cc_for_build
+
+	    # hppa2.0w-hp-hpux* has a 64-bit kernel and a compiler generating
+	    # 32-bit code.  hppa64-hp-hpux* has the same kernel and a compiler
+	    # generating 64-bit code.  GNU and HP use different nomenclature:
+	    #
+	    # $ CC_FOR_BUILD=cc ./config.guess
+	    # => hppa2.0w-hp-hpux11.23
+	    # $ CC_FOR_BUILD="cc +DA2.0w" ./config.guess
+	    # => hppa64-hp-hpux11.23
+
+	    if echo __LP64__ | (CCOPTS="" $CC_FOR_BUILD -E - 2>/dev/null) |
+		grep -q __LP64__
 	    then
-		HP_ARCH="hppa2.0w"
+		HP_ARCH=hppa2.0w
 	    else
-		HP_ARCH="hppa64"
+		HP_ARCH=hppa64
 	    fi
 	fi
-	echo ${HP_ARCH}-hp-hpux${HPUX_REV}
-	exit 0 ;;
+	echo "$HP_ARCH"-hp-hpux"$HPUX_REV"
+	exit ;;
     ia64:HP-UX:*:*)
-	HPUX_REV=`echo ${UNAME_RELEASE}|sed -e 's/[^.]*.[0B]*//'`
-	echo ia64-hp-hpux${HPUX_REV}
-	exit 0 ;;
+	HPUX_REV=$(echo "$UNAME_RELEASE"|sed -e 's/[^.]*.[0B]*//')
+	echo ia64-hp-hpux"$HPUX_REV"
+	exit ;;
     3050*:HI-UX:*:*)
-	eval $set_cc_for_build
-	sed 's/^	//' << EOF >$dummy.c
+	set_cc_for_build
+	sed 's/^	//' << EOF > "$dummy.c"
 	#include <unistd.h>
 	int
 	main ()
@@ -675,359 +773,411 @@ EOF
 	  exit (0);
 	}
 EOF
-	$CC_FOR_BUILD -o $dummy $dummy.c && $dummy && exit 0
+	$CC_FOR_BUILD -o "$dummy" "$dummy.c" && SYSTEM_NAME=$("$dummy") &&
+		{ echo "$SYSTEM_NAME"; exit; }
 	echo unknown-hitachi-hiuxwe2
-	exit 0 ;;
-    9000/7??:4.3bsd:*:* | 9000/8?[79]:4.3bsd:*:* )
+	exit ;;
+    9000/7??:4.3bsd:*:* | 9000/8?[79]:4.3bsd:*:*)
 	echo hppa1.1-hp-bsd
-	exit 0 ;;
+	exit ;;
     9000/8??:4.3bsd:*:*)
 	echo hppa1.0-hp-bsd
-	exit 0 ;;
+	exit ;;
     *9??*:MPE/iX:*:* | *3000*:MPE/iX:*:*)
 	echo hppa1.0-hp-mpeix
-	exit 0 ;;
-    hp7??:OSF1:*:* | hp8?[79]:OSF1:*:* )
+	exit ;;
+    hp7??:OSF1:*:* | hp8?[79]:OSF1:*:*)
 	echo hppa1.1-hp-osf
-	exit 0 ;;
+	exit ;;
     hp8??:OSF1:*:*)
 	echo hppa1.0-hp-osf
-	exit 0 ;;
+	exit ;;
     i*86:OSF1:*:*)
-	if [ -x /usr/sbin/sysversion ] ; then
-	    echo ${UNAME_MACHINE}-unknown-osf1mk
+	if test -x /usr/sbin/sysversion ; then
+	    echo "$UNAME_MACHINE"-unknown-osf1mk
 	else
-	    echo ${UNAME_MACHINE}-unknown-osf1
+	    echo "$UNAME_MACHINE"-unknown-osf1
 	fi
-	exit 0 ;;
+	exit ;;
     parisc*:Lites*:*:*)
 	echo hppa1.1-hp-lites
-	exit 0 ;;
+	exit ;;
     C1*:ConvexOS:*:* | convex:ConvexOS:C1*:*)
 	echo c1-convex-bsd
-        exit 0 ;;
+	exit ;;
     C2*:ConvexOS:*:* | convex:ConvexOS:C2*:*)
 	if getsysinfo -f scalar_acc
 	then echo c32-convex-bsd
 	else echo c2-convex-bsd
 	fi
-        exit 0 ;;
+	exit ;;
     C34*:ConvexOS:*:* | convex:ConvexOS:C34*:*)
 	echo c34-convex-bsd
-        exit 0 ;;
+	exit ;;
     C38*:ConvexOS:*:* | convex:ConvexOS:C38*:*)
 	echo c38-convex-bsd
-        exit 0 ;;
+	exit ;;
     C4*:ConvexOS:*:* | convex:ConvexOS:C4*:*)
 	echo c4-convex-bsd
-        exit 0 ;;
+	exit ;;
     CRAY*Y-MP:*:*:*)
-	echo ymp-cray-unicos${UNAME_RELEASE} | sed -e 's/\.[^.]*$/.X/'
-	exit 0 ;;
+	echo ymp-cray-unicos"$UNAME_RELEASE" | sed -e 's/\.[^.]*$/.X/'
+	exit ;;
     CRAY*[A-Z]90:*:*:*)
-	echo ${UNAME_MACHINE}-cray-unicos${UNAME_RELEASE} \
+	echo "$UNAME_MACHINE"-cray-unicos"$UNAME_RELEASE" \
 	| sed -e 's/CRAY.*\([A-Z]90\)/\1/' \
 	      -e y/ABCDEFGHIJKLMNOPQRSTUVWXYZ/abcdefghijklmnopqrstuvwxyz/ \
 	      -e 's/\.[^.]*$/.X/'
-	exit 0 ;;
+	exit ;;
     CRAY*TS:*:*:*)
-	echo t90-cray-unicos${UNAME_RELEASE} | sed -e 's/\.[^.]*$/.X/'
-	exit 0 ;;
+	echo t90-cray-unicos"$UNAME_RELEASE" | sed -e 's/\.[^.]*$/.X/'
+	exit ;;
     CRAY*T3E:*:*:*)
-	echo alphaev5-cray-unicosmk${UNAME_RELEASE} | sed -e 's/\.[^.]*$/.X/'
-	exit 0 ;;
+	echo alphaev5-cray-unicosmk"$UNAME_RELEASE" | sed -e 's/\.[^.]*$/.X/'
+	exit ;;
     CRAY*SV1:*:*:*)
-	echo sv1-cray-unicos${UNAME_RELEASE} | sed -e 's/\.[^.]*$/.X/'
-	exit 0 ;;
+	echo sv1-cray-unicos"$UNAME_RELEASE" | sed -e 's/\.[^.]*$/.X/'
+	exit ;;
     *:UNICOS/mp:*:*)
-	echo nv1-cray-unicosmp${UNAME_RELEASE} | sed -e 's/\.[^.]*$/.X/'
-	exit 0 ;;
+	echo craynv-cray-unicosmp"$UNAME_RELEASE" | sed -e 's/\.[^.]*$/.X/'
+	exit ;;
     F30[01]:UNIX_System_V:*:* | F700:UNIX_System_V:*:*)
-	FUJITSU_PROC=`uname -m | tr 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' 'abcdefghijklmnopqrstuvwxyz'`
-        FUJITSU_SYS=`uname -p | tr 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' 'abcdefghijklmnopqrstuvwxyz' | sed -e 's/\///'`
-        FUJITSU_REL=`echo ${UNAME_RELEASE} | sed -e 's/ /_/'`
-        echo "${FUJITSU_PROC}-fujitsu-${FUJITSU_SYS}${FUJITSU_REL}"
-        exit 0 ;;
+	FUJITSU_PROC=$(uname -m | tr ABCDEFGHIJKLMNOPQRSTUVWXYZ abcdefghijklmnopqrstuvwxyz)
+	FUJITSU_SYS=$(uname -p | tr ABCDEFGHIJKLMNOPQRSTUVWXYZ abcdefghijklmnopqrstuvwxyz | sed -e 's/\///')
+	FUJITSU_REL=$(echo "$UNAME_RELEASE" | sed -e 's/ /_/')
+	echo "${FUJITSU_PROC}-fujitsu-${FUJITSU_SYS}${FUJITSU_REL}"
+	exit ;;
     5000:UNIX_System_V:4.*:*)
-        FUJITSU_SYS=`uname -p | tr 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' 'abcdefghijklmnopqrstuvwxyz' | sed -e 's/\///'`
-        FUJITSU_REL=`echo ${UNAME_RELEASE} | tr 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' 'abcdefghijklmnopqrstuvwxyz' | sed -e 's/ /_/'`
-        echo "sparc-fujitsu-${FUJITSU_SYS}${FUJITSU_REL}"
-	exit 0 ;;
+	FUJITSU_SYS=$(uname -p | tr ABCDEFGHIJKLMNOPQRSTUVWXYZ abcdefghijklmnopqrstuvwxyz | sed -e 's/\///')
+	FUJITSU_REL=$(echo "$UNAME_RELEASE" | tr ABCDEFGHIJKLMNOPQRSTUVWXYZ abcdefghijklmnopqrstuvwxyz | sed -e 's/ /_/')
+	echo "sparc-fujitsu-${FUJITSU_SYS}${FUJITSU_REL}"
+	exit ;;
     i*86:BSD/386:*:* | i*86:BSD/OS:*:* | *:Ascend\ Embedded/OS:*:*)
-	echo ${UNAME_MACHINE}-pc-bsdi${UNAME_RELEASE}
-	exit 0 ;;
+	echo "$UNAME_MACHINE"-pc-bsdi"$UNAME_RELEASE"
+	exit ;;
     sparc*:BSD/OS:*:*)
-	echo sparc-unknown-bsdi${UNAME_RELEASE}
-	exit 0 ;;
+	echo sparc-unknown-bsdi"$UNAME_RELEASE"
+	exit ;;
     *:BSD/OS:*:*)
-	echo ${UNAME_MACHINE}-unknown-bsdi${UNAME_RELEASE}
-	exit 0 ;;
+	echo "$UNAME_MACHINE"-unknown-bsdi"$UNAME_RELEASE"
+	exit ;;
+    arm:FreeBSD:*:*)
+	UNAME_PROCESSOR=$(uname -p)
+	set_cc_for_build
+	if echo __ARM_PCS_VFP | $CC_FOR_BUILD -E - 2>/dev/null \
+	    | grep -q __ARM_PCS_VFP
+	then
+	    echo "${UNAME_PROCESSOR}"-unknown-freebsd"$(echo ${UNAME_RELEASE}|sed -e 's/[-(].*//')"-gnueabi
+	else
+	    echo "${UNAME_PROCESSOR}"-unknown-freebsd"$(echo ${UNAME_RELEASE}|sed -e 's/[-(].*//')"-gnueabihf
+	fi
+	exit ;;
     *:FreeBSD:*:*)
-	# Determine whether the default compiler uses glibc.
-	eval $set_cc_for_build
-	sed 's/^	//' << EOF >$dummy.c
-	#include <features.h>
-	#if __GLIBC__ >= 2
-	LIBC=gnu
-	#else
-	LIBC=
-	#endif
-EOF
-	eval `$CC_FOR_BUILD -E $dummy.c 2>/dev/null | grep ^LIBC=`
-	# GNU/KFreeBSD systems have a "k" prefix to indicate we are using
-	# FreeBSD's kernel, but not the complete OS.
-	case ${LIBC} in gnu) kernel_only='k' ;; esac
-	echo ${UNAME_MACHINE}-unknown-${kernel_only}freebsd`echo ${UNAME_RELEASE}|sed -e 's/[-(].*//'`${LIBC:+-$LIBC}
-	exit 0 ;;
+	UNAME_PROCESSOR=$(/usr/bin/uname -p)
+	case "$UNAME_PROCESSOR" in
+	    amd64)
+		UNAME_PROCESSOR=x86_64 ;;
+	    i386)
+		UNAME_PROCESSOR=i586 ;;
+	esac
+	echo "$UNAME_PROCESSOR"-unknown-freebsd"$(echo "$UNAME_RELEASE"|sed -e 's/[-(].*//')"
+	exit ;;
     i*:CYGWIN*:*)
-	echo ${UNAME_MACHINE}-pc-cygwin
-	exit 0 ;;
-    i*:MINGW*:*)
-	echo ${UNAME_MACHINE}-pc-mingw32
-	exit 0 ;;
+	echo "$UNAME_MACHINE"-pc-cygwin
+	exit ;;
+    *:MINGW64*:*)
+	echo "$UNAME_MACHINE"-pc-mingw64
+	exit ;;
+    *:MINGW*:*)
+	echo "$UNAME_MACHINE"-pc-mingw32
+	exit ;;
+    *:MSYS*:*)
+	echo "$UNAME_MACHINE"-pc-msys
+	exit ;;
     i*:PW*:*)
-	echo ${UNAME_MACHINE}-pc-pw32
-	exit 0 ;;
-    x86:Interix*:[34]*)
-	echo i586-pc-interix${UNAME_RELEASE}|sed -e 's/\..*//'
-	exit 0 ;;
-    [345]86:Windows_95:* | [345]86:Windows_98:* | [345]86:Windows_NT:*)
-	echo i${UNAME_MACHINE}-pc-mks
-	exit 0 ;;
-    i*:Windows_NT*:* | Pentium*:Windows_NT*:*)
-	# How do we know it's Interix rather than the generic POSIX subsystem?
-	# It also conflicts with pre-2.0 versions of AT&T UWIN. Should we
-	# UNAME_MACHINE based on the output of uname instead of i386?
-	echo i586-pc-interix
-	exit 0 ;;
+	echo "$UNAME_MACHINE"-pc-pw32
+	exit ;;
+    *:Interix*:*)
+	case "$UNAME_MACHINE" in
+	    x86)
+		echo i586-pc-interix"$UNAME_RELEASE"
+		exit ;;
+	    authenticamd | genuineintel | EM64T)
+		echo x86_64-unknown-interix"$UNAME_RELEASE"
+		exit ;;
+	    IA64)
+		echo ia64-unknown-interix"$UNAME_RELEASE"
+		exit ;;
+	esac ;;
     i*:UWIN*:*)
-	echo ${UNAME_MACHINE}-pc-uwin
-	exit 0 ;;
-    p*:CYGWIN*:*)
-	echo powerpcle-unknown-cygwin
-	exit 0 ;;
+	echo "$UNAME_MACHINE"-pc-uwin
+	exit ;;
+    amd64:CYGWIN*:*:* | x86_64:CYGWIN*:*:*)
+	echo x86_64-pc-cygwin
+	exit ;;
     prep*:SunOS:5.*:*)
-	echo powerpcle-unknown-solaris2`echo ${UNAME_RELEASE}|sed -e 's/[^.]*//'`
-	exit 0 ;;
+	echo powerpcle-unknown-solaris2"$(echo "$UNAME_RELEASE"|sed -e 's/[^.]*//')"
+	exit ;;
     *:GNU:*:*)
 	# the GNU system
-	echo `echo ${UNAME_MACHINE}|sed -e 's,[-/].*$,,'`-unknown-gnu`echo ${UNAME_RELEASE}|sed -e 's,/.*$,,'`
-	exit 0 ;;
+	echo "$(echo "$UNAME_MACHINE"|sed -e 's,[-/].*$,,')-unknown-$LIBC$(echo "$UNAME_RELEASE"|sed -e 's,/.*$,,')"
+	exit ;;
     *:GNU/*:*:*)
 	# other systems with GNU libc and userland
-	echo ${UNAME_MACHINE}-unknown-`echo ${UNAME_SYSTEM} | sed 's,^[^/]*/,,' | tr '[A-Z]' '[a-z]'``echo ${UNAME_RELEASE}|sed -e 's/[-(].*//'`-gnu
-	exit 0 ;;
-    i*86:Minix:*:*)
-	echo ${UNAME_MACHINE}-pc-minix
-	exit 0 ;;
+	echo "$UNAME_MACHINE-unknown-$(echo "$UNAME_SYSTEM" | sed 's,^[^/]*/,,' | tr "[:upper:]" "[:lower:]")$(echo "$UNAME_RELEASE"|sed -e 's/[-(].*//')-$LIBC"
+	exit ;;
+    *:Minix:*:*)
+	echo "$UNAME_MACHINE"-unknown-minix
+	exit ;;
+    aarch64:Linux:*:*)
+	echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
+	exit ;;
+    aarch64_be:Linux:*:*)
+	UNAME_MACHINE=aarch64_be
+	echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
+	exit ;;
+    alpha:Linux:*:*)
+	case $(sed -n '/^cpu model/s/^.*: \(.*\)/\1/p' /proc/cpuinfo 2>/dev/null) in
+	  EV5)   UNAME_MACHINE=alphaev5 ;;
+	  EV56)  UNAME_MACHINE=alphaev56 ;;
+	  PCA56) UNAME_MACHINE=alphapca56 ;;
+	  PCA57) UNAME_MACHINE=alphapca56 ;;
+	  EV6)   UNAME_MACHINE=alphaev6 ;;
+	  EV67)  UNAME_MACHINE=alphaev67 ;;
+	  EV68*) UNAME_MACHINE=alphaev68 ;;
+	esac
+	objdump --private-headers /bin/sh | grep -q ld.so.1
+	if test "$?" = 0 ; then LIBC=gnulibc1 ; fi
+	echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
+	exit ;;
+    arc:Linux:*:* | arceb:Linux:*:*)
+	echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
+	exit ;;
     arm*:Linux:*:*)
-	echo ${UNAME_MACHINE}-unknown-linux-gnu
-	exit 0 ;;
+	set_cc_for_build
+	if echo __ARM_EABI__ | $CC_FOR_BUILD -E - 2>/dev/null \
+	    | grep -q __ARM_EABI__
+	then
+	    echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
+	else
+	    if echo __ARM_PCS_VFP | $CC_FOR_BUILD -E - 2>/dev/null \
+		| grep -q __ARM_PCS_VFP
+	    then
+		echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"eabi
+	    else
+		echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"eabihf
+	    fi
+	fi
+	exit ;;
+    avr32*:Linux:*:*)
+	echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
+	exit ;;
     cris:Linux:*:*)
-	echo cris-axis-linux-gnu
-	exit 0 ;;
+	echo "$UNAME_MACHINE"-axis-linux-"$LIBC"
+	exit ;;
+    crisv32:Linux:*:*)
+	echo "$UNAME_MACHINE"-axis-linux-"$LIBC"
+	exit ;;
+    e2k:Linux:*:*)
+	echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
+	exit ;;
+    frv:Linux:*:*)
+	echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
+	exit ;;
+    hexagon:Linux:*:*)
+	echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
+	exit ;;
+    i*86:Linux:*:*)
+	echo "$UNAME_MACHINE"-pc-linux-"$LIBC"
+	exit ;;
     ia64:Linux:*:*)
-	echo ${UNAME_MACHINE}-unknown-linux-gnu
-	exit 0 ;;
+	echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
+	exit ;;
+    k1om:Linux:*:*)
+	echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
+	exit ;;
+    m32r*:Linux:*:*)
+	echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
+	exit ;;
     m68*:Linux:*:*)
-	echo ${UNAME_MACHINE}-unknown-linux-gnu
-	exit 0 ;;
-    mips:Linux:*:*)
-	eval $set_cc_for_build
-	sed 's/^	//' << EOF >$dummy.c
+	echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
+	exit ;;
+    mips:Linux:*:* | mips64:Linux:*:*)
+	set_cc_for_build
+	IS_GLIBC=0
+	test x"${LIBC}" = xgnu && IS_GLIBC=1
+	sed 's/^	//' << EOF > "$dummy.c"
 	#undef CPU
 	#undef mips
 	#undef mipsel
-	#if defined(__MIPSEL__) || defined(__MIPSEL) || defined(_MIPSEL) || defined(MIPSEL)
-	CPU=mipsel
+	#undef mips64
+	#undef mips64el
+	#if ${IS_GLIBC} && defined(_ABI64)
+	LIBCABI=gnuabi64
 	#else
-	#if defined(__MIPSEB__) || defined(__MIPSEB) || defined(_MIPSEB) || defined(MIPSEB)
-	CPU=mips
+	#if ${IS_GLIBC} && defined(_ABIN32)
+	LIBCABI=gnuabin32
 	#else
-	CPU=
+	LIBCABI=${LIBC}
 	#endif
 	#endif
-EOF
-	eval `$CC_FOR_BUILD -E $dummy.c 2>/dev/null | grep ^CPU=`
-	test x"${CPU}" != x && echo "${CPU}-unknown-linux-gnu" && exit 0
-	;;
-    mips64:Linux:*:*)
-	eval $set_cc_for_build
-	sed 's/^	//' << EOF >$dummy.c
-	#undef CPU
-	#undef mips64
-	#undef mips64el
+
+	#if ${IS_GLIBC} && defined(__mips64) && defined(__mips_isa_rev) && __mips_isa_rev>=6
+	CPU=mipsisa64r6
+	#else
+	#if ${IS_GLIBC} && !defined(__mips64) && defined(__mips_isa_rev) && __mips_isa_rev>=6
+	CPU=mipsisa32r6
+	#else
+	#if defined(__mips64)
+	CPU=mips64
+	#else
+	CPU=mips
+	#endif
+	#endif
+	#endif
+
 	#if defined(__MIPSEL__) || defined(__MIPSEL) || defined(_MIPSEL) || defined(MIPSEL)
-	CPU=mips64el
+	MIPS_ENDIAN=el
 	#else
 	#if defined(__MIPSEB__) || defined(__MIPSEB) || defined(_MIPSEB) || defined(MIPSEB)
-	CPU=mips64
+	MIPS_ENDIAN=
 	#else
-	CPU=
+	MIPS_ENDIAN=
 	#endif
 	#endif
 EOF
-	eval `$CC_FOR_BUILD -E $dummy.c 2>/dev/null | grep ^CPU=`
-	test x"${CPU}" != x && echo "${CPU}-unknown-linux-gnu" && exit 0
+	eval "$($CC_FOR_BUILD -E "$dummy.c" 2>/dev/null | grep '^CPU\|^MIPS_ENDIAN\|^LIBCABI')"
+	test "x$CPU" != x && { echo "$CPU${MIPS_ENDIAN}-unknown-linux-$LIBCABI"; exit; }
 	;;
-    ppc:Linux:*:*)
-	echo powerpc-unknown-linux-gnu
-	exit 0 ;;
-    ppc64:Linux:*:*)
-	echo powerpc64-unknown-linux-gnu
-	exit 0 ;;
-    alpha:Linux:*:*)
-	case `sed -n '/^cpu model/s/^.*: \(.*\)/\1/p' < /proc/cpuinfo` in
-	  EV5)   UNAME_MACHINE=alphaev5 ;;
-	  EV56)  UNAME_MACHINE=alphaev56 ;;
-	  PCA56) UNAME_MACHINE=alphapca56 ;;
-	  PCA57) UNAME_MACHINE=alphapca56 ;;
-	  EV6)   UNAME_MACHINE=alphaev6 ;;
-	  EV67)  UNAME_MACHINE=alphaev67 ;;
-	  EV68*) UNAME_MACHINE=alphaev68 ;;
-        esac
-	objdump --private-headers /bin/sh | grep ld.so.1 >/dev/null
-	if test "$?" = 0 ; then LIBC="libc1" ; else LIBC="" ; fi
-	echo ${UNAME_MACHINE}-unknown-linux-gnu${LIBC}
-	exit 0 ;;
+    mips64el:Linux:*:*)
+	echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
+	exit ;;
+    openrisc*:Linux:*:*)
+	echo or1k-unknown-linux-"$LIBC"
+	exit ;;
+    or32:Linux:*:* | or1k*:Linux:*:*)
+	echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
+	exit ;;
+    padre:Linux:*:*)
+	echo sparc-unknown-linux-"$LIBC"
+	exit ;;
+    parisc64:Linux:*:* | hppa64:Linux:*:*)
+	echo hppa64-unknown-linux-"$LIBC"
+	exit ;;
     parisc:Linux:*:* | hppa:Linux:*:*)
 	# Look for CPU level
-	case `grep '^cpu[^a-z]*:' /proc/cpuinfo 2>/dev/null | cut -d' ' -f2` in
-	  PA7*) echo hppa1.1-unknown-linux-gnu ;;
-	  PA8*) echo hppa2.0-unknown-linux-gnu ;;
-	  *)    echo hppa-unknown-linux-gnu ;;
+	case $(grep '^cpu[^a-z]*:' /proc/cpuinfo 2>/dev/null | cut -d' ' -f2) in
+	  PA7*) echo hppa1.1-unknown-linux-"$LIBC" ;;
+	  PA8*) echo hppa2.0-unknown-linux-"$LIBC" ;;
+	  *)    echo hppa-unknown-linux-"$LIBC" ;;
 	esac
-	exit 0 ;;
-    parisc64:Linux:*:* | hppa64:Linux:*:*)
-	echo hppa64-unknown-linux-gnu
-	exit 0 ;;
+	exit ;;
+    ppc64:Linux:*:*)
+	echo powerpc64-unknown-linux-"$LIBC"
+	exit ;;
+    ppc:Linux:*:*)
+	echo powerpc-unknown-linux-"$LIBC"
+	exit ;;
+    ppc64le:Linux:*:*)
+	echo powerpc64le-unknown-linux-"$LIBC"
+	exit ;;
+    ppcle:Linux:*:*)
+	echo powerpcle-unknown-linux-"$LIBC"
+	exit ;;
+    riscv32:Linux:*:* | riscv64:Linux:*:*)
+	echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
+	exit ;;
     s390:Linux:*:* | s390x:Linux:*:*)
-	echo ${UNAME_MACHINE}-ibm-linux
-	exit 0 ;;
+	echo "$UNAME_MACHINE"-ibm-linux-"$LIBC"
+	exit ;;
     sh64*:Linux:*:*)
-    	echo ${UNAME_MACHINE}-unknown-linux-gnu
-	exit 0 ;;
+	echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
+	exit ;;
     sh*:Linux:*:*)
-	echo ${UNAME_MACHINE}-unknown-linux-gnu
-	exit 0 ;;
+	echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
+	exit ;;
     sparc:Linux:*:* | sparc64:Linux:*:*)
-	echo ${UNAME_MACHINE}-unknown-linux-gnu
-	exit 0 ;;
+	echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
+	exit ;;
+    tile*:Linux:*:*)
+	echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
+	exit ;;
+    vax:Linux:*:*)
+	echo "$UNAME_MACHINE"-dec-linux-"$LIBC"
+	exit ;;
     x86_64:Linux:*:*)
-	echo x86_64-unknown-linux-gnu
-	exit 0 ;;
-    i*86:Linux:*:*)
-	# The BFD linker knows what the default object file format is, so
-	# first see if it will tell us. cd to the root directory to prevent
-	# problems with other programs or directories called `ld' in the path.
-	# Set LC_ALL=C to ensure ld outputs messages in English.
-	ld_supported_targets=`cd /; LC_ALL=C ld --help 2>&1 \
-			 | sed -ne '/supported targets:/!d
-				    s/[ 	][ 	]*/ /g
-				    s/.*supported targets: *//
-				    s/ .*//
-				    p'`
-        case "$ld_supported_targets" in
-	  elf32-i386)
-		TENTATIVE="${UNAME_MACHINE}-pc-linux-gnu"
-		;;
-	  a.out-i386-linux)
-		echo "${UNAME_MACHINE}-pc-linux-gnuaout"
-		exit 0 ;;
-	  coff-i386)
-		echo "${UNAME_MACHINE}-pc-linux-gnucoff"
-		exit 0 ;;
-	  "")
-		# Either a pre-BFD a.out linker (linux-gnuoldld) or
-		# one that does not give us useful --help.
-		echo "${UNAME_MACHINE}-pc-linux-gnuoldld"
-		exit 0 ;;
-	esac
-	# Determine whether the default compiler is a.out or elf
-	eval $set_cc_for_build
-	sed 's/^	//' << EOF >$dummy.c
-	#include <features.h>
-	#ifdef __ELF__
-	# ifdef __GLIBC__
-	#  if __GLIBC__ >= 2
-	LIBC=gnu
-	#  else
-	LIBC=gnulibc1
-	#  endif
-	# else
-	LIBC=gnulibc1
-	# endif
-	#else
-	#ifdef __INTEL_COMPILER
-	LIBC=gnu
-	#else
-	LIBC=gnuaout
-	#endif
-	#endif
-	#ifdef __dietlibc__
-	LIBC=dietlibc
-	#endif
-EOF
-	eval `$CC_FOR_BUILD -E $dummy.c 2>/dev/null | grep ^LIBC=`
-	test x"${LIBC}" != x && echo "${UNAME_MACHINE}-pc-linux-${LIBC}" && exit 0
-	test x"${TENTATIVE}" != x && echo "${TENTATIVE}" && exit 0
-	;;
+	set_cc_for_build
+	LIBCABI=$LIBC
+	if test "$CC_FOR_BUILD" != no_compiler_found; then
+	    if (echo '#ifdef __ILP32__'; echo IS_X32; echo '#endif') | \
+		(CCOPTS="" $CC_FOR_BUILD -E - 2>/dev/null) | \
+		grep IS_X32 >/dev/null
+	    then
+		LIBCABI="$LIBC"x32
+	    fi
+	fi
+	echo "$UNAME_MACHINE"-pc-linux-"$LIBCABI"
+	exit ;;
+    xtensa*:Linux:*:*)
+	echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
+	exit ;;
     i*86:DYNIX/ptx:4*:*)
 	# ptx 4.0 does uname -s correctly, with DYNIX/ptx in there.
 	# earlier versions are messed up and put the nodename in both
 	# sysname and nodename.
 	echo i386-sequent-sysv4
-	exit 0 ;;
+	exit ;;
     i*86:UNIX_SV:4.2MP:2.*)
-        # Unixware is an offshoot of SVR4, but it has its own version
-        # number series starting with 2...
-        # I am not positive that other SVR4 systems won't match this,
+	# Unixware is an offshoot of SVR4, but it has its own version
+	# number series starting with 2...
+	# I am not positive that other SVR4 systems won't match this,
 	# I just have to hope.  -- rms.
-        # Use sysv4.2uw... so that sysv4* matches it.
-	echo ${UNAME_MACHINE}-pc-sysv4.2uw${UNAME_VERSION}
-	exit 0 ;;
+	# Use sysv4.2uw... so that sysv4* matches it.
+	echo "$UNAME_MACHINE"-pc-sysv4.2uw"$UNAME_VERSION"
+	exit ;;
     i*86:OS/2:*:*)
 	# If we were able to find `uname', then EMX Unix compatibility
 	# is probably installed.
-	echo ${UNAME_MACHINE}-pc-os2-emx
-	exit 0 ;;
+	echo "$UNAME_MACHINE"-pc-os2-emx
+	exit ;;
     i*86:XTS-300:*:STOP)
-	echo ${UNAME_MACHINE}-unknown-stop
-	exit 0 ;;
+	echo "$UNAME_MACHINE"-unknown-stop
+	exit ;;
     i*86:atheos:*:*)
-	echo ${UNAME_MACHINE}-unknown-atheos
-	exit 0 ;;
-	i*86:syllable:*:*)
-	echo ${UNAME_MACHINE}-pc-syllable
-	exit 0 ;;
-    i*86:LynxOS:2.*:* | i*86:LynxOS:3.[01]*:* | i*86:LynxOS:4.0*:*)
-	echo i386-unknown-lynxos${UNAME_RELEASE}
-	exit 0 ;;
+	echo "$UNAME_MACHINE"-unknown-atheos
+	exit ;;
+    i*86:syllable:*:*)
+	echo "$UNAME_MACHINE"-pc-syllable
+	exit ;;
+    i*86:LynxOS:2.*:* | i*86:LynxOS:3.[01]*:* | i*86:LynxOS:4.[02]*:*)
+	echo i386-unknown-lynxos"$UNAME_RELEASE"
+	exit ;;
     i*86:*DOS:*:*)
-	echo ${UNAME_MACHINE}-pc-msdosdjgpp
-	exit 0 ;;
-    i*86:*:4.*:* | i*86:SYSTEM_V:4.*:*)
-	UNAME_REL=`echo ${UNAME_RELEASE} | sed 's/\/MP$//'`
+	echo "$UNAME_MACHINE"-pc-msdosdjgpp
+	exit ;;
+    i*86:*:4.*:*)
+	UNAME_REL=$(echo "$UNAME_RELEASE" | sed 's/\/MP$//')
 	if grep Novell /usr/include/link.h >/dev/null 2>/dev/null; then
-		echo ${UNAME_MACHINE}-univel-sysv${UNAME_REL}
+		echo "$UNAME_MACHINE"-univel-sysv"$UNAME_REL"
 	else
-		echo ${UNAME_MACHINE}-pc-sysv${UNAME_REL}
+		echo "$UNAME_MACHINE"-pc-sysv"$UNAME_REL"
 	fi
-	exit 0 ;;
-    i*86:*:5:[78]*)
-	case `/bin/uname -X | grep "^Machine"` in
+	exit ;;
+    i*86:*:5:[678]*)
+	# UnixWare 7.x, OpenUNIX and OpenServer 6.
+	case $(/bin/uname -X | grep "^Machine") in
 	    *486*)	     UNAME_MACHINE=i486 ;;
 	    *Pentium)	     UNAME_MACHINE=i586 ;;
 	    *Pent*|*Celeron) UNAME_MACHINE=i686 ;;
 	esac
-	echo ${UNAME_MACHINE}-unknown-sysv${UNAME_RELEASE}${UNAME_SYSTEM}${UNAME_VERSION}
-	exit 0 ;;
+	echo "$UNAME_MACHINE-unknown-sysv${UNAME_RELEASE}${UNAME_SYSTEM}${UNAME_VERSION}"
+	exit ;;
     i*86:*:3.2:*)
 	if test -f /usr/options/cb.name; then
-		UNAME_REL=`sed -n 's/.*Version //p' </usr/options/cb.name`
-		echo ${UNAME_MACHINE}-pc-isc$UNAME_REL
+		UNAME_REL=$(sed -n 's/.*Version //p' </usr/options/cb.name)
+		echo "$UNAME_MACHINE"-pc-isc"$UNAME_REL"
 	elif /bin/uname -X 2>/dev/null >/dev/null ; then
-		UNAME_REL=`(/bin/uname -X|grep Release|sed -e 's/.*= //')`
+		UNAME_REL=$( (/bin/uname -X|grep Release|sed -e 's/.*= //'))
 		(/bin/uname -X|grep i80486 >/dev/null) && UNAME_MACHINE=i486
 		(/bin/uname -X|grep '^Machine.*Pentium' >/dev/null) \
 			&& UNAME_MACHINE=i586
@@ -1035,214 +1185,329 @@ EOF
 			&& UNAME_MACHINE=i686
 		(/bin/uname -X|grep '^Machine.*Pentium Pro' >/dev/null) \
 			&& UNAME_MACHINE=i686
-		echo ${UNAME_MACHINE}-pc-sco$UNAME_REL
+		echo "$UNAME_MACHINE"-pc-sco"$UNAME_REL"
 	else
-		echo ${UNAME_MACHINE}-pc-sysv32
+		echo "$UNAME_MACHINE"-pc-sysv32
 	fi
-	exit 0 ;;
+	exit ;;
     pc:*:*:*)
 	# Left here for compatibility:
-        # uname -m prints for DJGPP always 'pc', but it prints nothing about
-        # the processor, so we play safe by assuming i386.
-	echo i386-pc-msdosdjgpp
-        exit 0 ;;
+	# uname -m prints for DJGPP always 'pc', but it prints nothing about
+	# the processor, so we play safe by assuming i586.
+	# Note: whatever this is, it MUST be the same as what config.sub
+	# prints for the "djgpp" host, or else GDB configure will decide that
+	# this is a cross-build.
+	echo i586-pc-msdosdjgpp
+	exit ;;
     Intel:Mach:3*:*)
 	echo i386-pc-mach3
-	exit 0 ;;
+	exit ;;
     paragon:*:*:*)
 	echo i860-intel-osf1
-	exit 0 ;;
+	exit ;;
     i860:*:4.*:*) # i860-SVR4
 	if grep Stardent /usr/include/sys/uadmin.h >/dev/null 2>&1 ; then
-	  echo i860-stardent-sysv${UNAME_RELEASE} # Stardent Vistra i860-SVR4
+	  echo i860-stardent-sysv"$UNAME_RELEASE" # Stardent Vistra i860-SVR4
 	else # Add other i860-SVR4 vendors below as they are discovered.
-	  echo i860-unknown-sysv${UNAME_RELEASE}  # Unknown i860-SVR4
+	  echo i860-unknown-sysv"$UNAME_RELEASE"  # Unknown i860-SVR4
 	fi
-	exit 0 ;;
+	exit ;;
     mini*:CTIX:SYS*5:*)
 	# "miniframe"
 	echo m68010-convergent-sysv
-	exit 0 ;;
+	exit ;;
     mc68k:UNIX:SYSTEM5:3.51m)
 	echo m68k-convergent-sysv
-	exit 0 ;;
+	exit ;;
     M680?0:D-NIX:5.3:*)
 	echo m68k-diab-dnix
-	exit 0 ;;
-    M68*:*:R3V[567]*:*)
-	test -r /sysV68 && echo 'm68k-motorola-sysv' && exit 0 ;;
-    3[345]??:*:4.0:3.0 | 3[34]??A:*:4.0:3.0 | 3[34]??,*:*:4.0:3.0 | 3[34]??/*:*:4.0:3.0 | 4400:*:4.0:3.0 | 4850:*:4.0:3.0 | SKA40:*:4.0:3.0 | SDS2:*:4.0:3.0 | SHG2:*:4.0:3.0)
+	exit ;;
+    M68*:*:R3V[5678]*:*)
+	test -r /sysV68 && { echo 'm68k-motorola-sysv'; exit; } ;;
+    3[345]??:*:4.0:3.0 | 3[34]??A:*:4.0:3.0 | 3[34]??,*:*:4.0:3.0 | 3[34]??/*:*:4.0:3.0 | 4400:*:4.0:3.0 | 4850:*:4.0:3.0 | SKA40:*:4.0:3.0 | SDS2:*:4.0:3.0 | SHG2:*:4.0:3.0 | S7501*:*:4.0:3.0)
 	OS_REL=''
 	test -r /etc/.relid \
-	&& OS_REL=.`sed -n 's/[^ ]* [^ ]* \([0-9][0-9]\).*/\1/p' < /etc/.relid`
+	&& OS_REL=.$(sed -n 's/[^ ]* [^ ]* \([0-9][0-9]\).*/\1/p' < /etc/.relid)
 	/bin/uname -p 2>/dev/null | grep 86 >/dev/null \
-	  && echo i486-ncr-sysv4.3${OS_REL} && exit 0
+	  && { echo i486-ncr-sysv4.3"$OS_REL"; exit; }
 	/bin/uname -p 2>/dev/null | /bin/grep entium >/dev/null \
-	  && echo i586-ncr-sysv4.3${OS_REL} && exit 0 ;;
+	  && { echo i586-ncr-sysv4.3"$OS_REL"; exit; } ;;
     3[34]??:*:4.0:* | 3[34]??,*:*:4.0:*)
-        /bin/uname -p 2>/dev/null | grep 86 >/dev/null \
-          && echo i486-ncr-sysv4 && exit 0 ;;
+	/bin/uname -p 2>/dev/null | grep 86 >/dev/null \
+	  && { echo i486-ncr-sysv4; exit; } ;;
+    NCR*:*:4.2:* | MPRAS*:*:4.2:*)
+	OS_REL='.3'
+	test -r /etc/.relid \
+	    && OS_REL=.$(sed -n 's/[^ ]* [^ ]* \([0-9][0-9]\).*/\1/p' < /etc/.relid)
+	/bin/uname -p 2>/dev/null | grep 86 >/dev/null \
+	    && { echo i486-ncr-sysv4.3"$OS_REL"; exit; }
+	/bin/uname -p 2>/dev/null | /bin/grep entium >/dev/null \
+	    && { echo i586-ncr-sysv4.3"$OS_REL"; exit; }
+	/bin/uname -p 2>/dev/null | /bin/grep pteron >/dev/null \
+	    && { echo i586-ncr-sysv4.3"$OS_REL"; exit; } ;;
     m68*:LynxOS:2.*:* | m68*:LynxOS:3.0*:*)
-	echo m68k-unknown-lynxos${UNAME_RELEASE}
-	exit 0 ;;
+	echo m68k-unknown-lynxos"$UNAME_RELEASE"
+	exit ;;
     mc68030:UNIX_System_V:4.*:*)
 	echo m68k-atari-sysv4
-	exit 0 ;;
+	exit ;;
     TSUNAMI:LynxOS:2.*:*)
-	echo sparc-unknown-lynxos${UNAME_RELEASE}
-	exit 0 ;;
+	echo sparc-unknown-lynxos"$UNAME_RELEASE"
+	exit ;;
     rs6000:LynxOS:2.*:*)
-	echo rs6000-unknown-lynxos${UNAME_RELEASE}
-	exit 0 ;;
-    PowerPC:LynxOS:2.*:* | PowerPC:LynxOS:3.[01]*:* | PowerPC:LynxOS:4.0*:*)
-	echo powerpc-unknown-lynxos${UNAME_RELEASE}
-	exit 0 ;;
+	echo rs6000-unknown-lynxos"$UNAME_RELEASE"
+	exit ;;
+    PowerPC:LynxOS:2.*:* | PowerPC:LynxOS:3.[01]*:* | PowerPC:LynxOS:4.[02]*:*)
+	echo powerpc-unknown-lynxos"$UNAME_RELEASE"
+	exit ;;
     SM[BE]S:UNIX_SV:*:*)
-	echo mips-dde-sysv${UNAME_RELEASE}
-	exit 0 ;;
+	echo mips-dde-sysv"$UNAME_RELEASE"
+	exit ;;
     RM*:ReliantUNIX-*:*:*)
 	echo mips-sni-sysv4
-	exit 0 ;;
+	exit ;;
     RM*:SINIX-*:*:*)
 	echo mips-sni-sysv4
-	exit 0 ;;
+	exit ;;
     *:SINIX-*:*:*)
 	if uname -p 2>/dev/null >/dev/null ; then
-		UNAME_MACHINE=`(uname -p) 2>/dev/null`
-		echo ${UNAME_MACHINE}-sni-sysv4
+		UNAME_MACHINE=$( (uname -p) 2>/dev/null)
+		echo "$UNAME_MACHINE"-sni-sysv4
 	else
 		echo ns32k-sni-sysv
 	fi
-	exit 0 ;;
-    PENTIUM:*:4.0*:*) # Unisys `ClearPath HMP IX 4000' SVR4/MP effort
-                      # says <[email protected]>
-        echo i586-unisys-sysv4
-        exit 0 ;;
+	exit ;;
+    PENTIUM:*:4.0*:*)	# Unisys `ClearPath HMP IX 4000' SVR4/MP effort
+			# says <[email protected]>
+	echo i586-unisys-sysv4
+	exit ;;
     *:UNIX_System_V:4*:FTX*)
 	# From Gerald Hewes <[email protected]>.
 	# How about differentiating between stratus architectures? -djm
 	echo hppa1.1-stratus-sysv4
-	exit 0 ;;
+	exit ;;
     *:*:*:FTX*)
 	# From [email protected].
 	echo i860-stratus-sysv4
-	exit 0 ;;
+	exit ;;
+    i*86:VOS:*:*)
+	# From [email protected].
+	echo "$UNAME_MACHINE"-stratus-vos
+	exit ;;
     *:VOS:*:*)
 	# From [email protected].
 	echo hppa1.1-stratus-vos
-	exit 0 ;;
+	exit ;;
     mc68*:A/UX:*:*)
-	echo m68k-apple-aux${UNAME_RELEASE}
-	exit 0 ;;
+	echo m68k-apple-aux"$UNAME_RELEASE"
+	exit ;;
     news*:NEWS-OS:6*:*)
 	echo mips-sony-newsos6
-	exit 0 ;;
+	exit ;;
     R[34]000:*System_V*:*:* | R4000:UNIX_SYSV:*:* | R*000:UNIX_SV:*:*)
-	if [ -d /usr/nec ]; then
-	        echo mips-nec-sysv${UNAME_RELEASE}
+	if test -d /usr/nec; then
+		echo mips-nec-sysv"$UNAME_RELEASE"
 	else
-	        echo mips-unknown-sysv${UNAME_RELEASE}
+		echo mips-unknown-sysv"$UNAME_RELEASE"
 	fi
-        exit 0 ;;
+	exit ;;
     BeBox:BeOS:*:*)	# BeOS running on hardware made by Be, PPC only.
 	echo powerpc-be-beos
-	exit 0 ;;
+	exit ;;
     BeMac:BeOS:*:*)	# BeOS running on Mac or Mac clone, PPC only.
 	echo powerpc-apple-beos
-	exit 0 ;;
+	exit ;;
     BePC:BeOS:*:*)	# BeOS running on Intel PC compatible.
 	echo i586-pc-beos
-	exit 0 ;;
+	exit ;;
+    BePC:Haiku:*:*)	# Haiku running on Intel PC compatible.
+	echo i586-pc-haiku
+	exit ;;
+    x86_64:Haiku:*:*)
+	echo x86_64-unknown-haiku
+	exit ;;
     SX-4:SUPER-UX:*:*)
-	echo sx4-nec-superux${UNAME_RELEASE}
-	exit 0 ;;
+	echo sx4-nec-superux"$UNAME_RELEASE"
+	exit ;;
     SX-5:SUPER-UX:*:*)
-	echo sx5-nec-superux${UNAME_RELEASE}
-	exit 0 ;;
+	echo sx5-nec-superux"$UNAME_RELEASE"
+	exit ;;
     SX-6:SUPER-UX:*:*)
-	echo sx6-nec-superux${UNAME_RELEASE}
-	exit 0 ;;
+	echo sx6-nec-superux"$UNAME_RELEASE"
+	exit ;;
+    SX-7:SUPER-UX:*:*)
+	echo sx7-nec-superux"$UNAME_RELEASE"
+	exit ;;
+    SX-8:SUPER-UX:*:*)
+	echo sx8-nec-superux"$UNAME_RELEASE"
+	exit ;;
+    SX-8R:SUPER-UX:*:*)
+	echo sx8r-nec-superux"$UNAME_RELEASE"
+	exit ;;
+    SX-ACE:SUPER-UX:*:*)
+	echo sxace-nec-superux"$UNAME_RELEASE"
+	exit ;;
     Power*:Rhapsody:*:*)
-	echo powerpc-apple-rhapsody${UNAME_RELEASE}
-	exit 0 ;;
+	echo powerpc-apple-rhapsody"$UNAME_RELEASE"
+	exit ;;
     *:Rhapsody:*:*)
-	echo ${UNAME_MACHINE}-apple-rhapsody${UNAME_RELEASE}
-	exit 0 ;;
+	echo "$UNAME_MACHINE"-apple-rhapsody"$UNAME_RELEASE"
+	exit ;;
+    arm64:Darwin:*:*)
+	echo aarch64-apple-darwin"$UNAME_RELEASE"
+	exit ;;
     *:Darwin:*:*)
-	case `uname -p` in
-	    *86) UNAME_PROCESSOR=i686 ;;
-	    powerpc) UNAME_PROCESSOR=powerpc ;;
+	UNAME_PROCESSOR=$(uname -p)
+	case $UNAME_PROCESSOR in
+	    unknown) UNAME_PROCESSOR=powerpc ;;
 	esac
-	echo ${UNAME_PROCESSOR}-apple-darwin${UNAME_RELEASE}
-	exit 0 ;;
+	if command -v xcode-select > /dev/null 2> /dev/null && \
+		! xcode-select --print-path > /dev/null 2> /dev/null ; then
+	    # Avoid executing cc if there is no toolchain installed as
+	    # cc will be a stub that puts up a graphical alert
+	    # prompting the user to install developer tools.
+	    CC_FOR_BUILD=no_compiler_found
+	else
+	    set_cc_for_build
+	fi
+	if test "$CC_FOR_BUILD" != no_compiler_found; then
+	    if (echo '#ifdef __LP64__'; echo IS_64BIT_ARCH; echo '#endif') | \
+		   (CCOPTS="" $CC_FOR_BUILD -E - 2>/dev/null) | \
+		   grep IS_64BIT_ARCH >/dev/null
+	    then
+		case $UNAME_PROCESSOR in
+		    i386) UNAME_PROCESSOR=x86_64 ;;
+		    powerpc) UNAME_PROCESSOR=powerpc64 ;;
+		esac
+	    fi
+	    # On 10.4-10.6 one might compile for PowerPC via gcc -arch ppc
+	    if (echo '#ifdef __POWERPC__'; echo IS_PPC; echo '#endif') | \
+		   (CCOPTS="" $CC_FOR_BUILD -E - 2>/dev/null) | \
+		   grep IS_PPC >/dev/null
+	    then
+		UNAME_PROCESSOR=powerpc
+	    fi
+	elif test "$UNAME_PROCESSOR" = i386 ; then
+	    # uname -m returns i386 or x86_64
+	    UNAME_PROCESSOR=$UNAME_MACHINE
+	fi
+	echo "$UNAME_PROCESSOR"-apple-darwin"$UNAME_RELEASE"
+	exit ;;
     *:procnto*:*:* | *:QNX:[0123456789]*:*)
-	UNAME_PROCESSOR=`uname -p`
-	if test "$UNAME_PROCESSOR" = "x86"; then
+	UNAME_PROCESSOR=$(uname -p)
+	if test "$UNAME_PROCESSOR" = x86; then
 		UNAME_PROCESSOR=i386
 		UNAME_MACHINE=pc
 	fi
-	echo ${UNAME_PROCESSOR}-${UNAME_MACHINE}-nto-qnx${UNAME_RELEASE}
-	exit 0 ;;
+	echo "$UNAME_PROCESSOR"-"$UNAME_MACHINE"-nto-qnx"$UNAME_RELEASE"
+	exit ;;
     *:QNX:*:4*)
 	echo i386-pc-qnx
-	exit 0 ;;
-    NSR-?:NONSTOP_KERNEL:*:*)
-	echo nsr-tandem-nsk${UNAME_RELEASE}
-	exit 0 ;;
+	exit ;;
+    NEO-*:NONSTOP_KERNEL:*:*)
+	echo neo-tandem-nsk"$UNAME_RELEASE"
+	exit ;;
+    NSE-*:NONSTOP_KERNEL:*:*)
+	echo nse-tandem-nsk"$UNAME_RELEASE"
+	exit ;;
+    NSR-*:NONSTOP_KERNEL:*:*)
+	echo nsr-tandem-nsk"$UNAME_RELEASE"
+	exit ;;
+    NSV-*:NONSTOP_KERNEL:*:*)
+	echo nsv-tandem-nsk"$UNAME_RELEASE"
+	exit ;;
+    NSX-*:NONSTOP_KERNEL:*:*)
+	echo nsx-tandem-nsk"$UNAME_RELEASE"
+	exit ;;
     *:NonStop-UX:*:*)
 	echo mips-compaq-nonstopux
-	exit 0 ;;
+	exit ;;
     BS2000:POSIX*:*:*)
 	echo bs2000-siemens-sysv
-	exit 0 ;;
+	exit ;;
     DS/*:UNIX_System_V:*:*)
-	echo ${UNAME_MACHINE}-${UNAME_SYSTEM}-${UNAME_RELEASE}
-	exit 0 ;;
+	echo "$UNAME_MACHINE"-"$UNAME_SYSTEM"-"$UNAME_RELEASE"
+	exit ;;
     *:Plan9:*:*)
 	# "uname -m" is not consistent, so use $cputype instead. 386
 	# is converted to i386 for consistency with other x86
 	# operating systems.
-	if test "$cputype" = "386"; then
+	# shellcheck disable=SC2154
+	if test "$cputype" = 386; then
 	    UNAME_MACHINE=i386
 	else
 	    UNAME_MACHINE="$cputype"
 	fi
-	echo ${UNAME_MACHINE}-unknown-plan9
-	exit 0 ;;
+	echo "$UNAME_MACHINE"-unknown-plan9
+	exit ;;
     *:TOPS-10:*:*)
 	echo pdp10-unknown-tops10
-	exit 0 ;;
+	exit ;;
     *:TENEX:*:*)
 	echo pdp10-unknown-tenex
-	exit 0 ;;
+	exit ;;
     KS10:TOPS-20:*:* | KL10:TOPS-20:*:* | TYPE4:TOPS-20:*:*)
 	echo pdp10-dec-tops20
-	exit 0 ;;
+	exit ;;
     XKL-1:TOPS-20:*:* | TYPE5:TOPS-20:*:*)
 	echo pdp10-xkl-tops20
-	exit 0 ;;
+	exit ;;
     *:TOPS-20:*:*)
 	echo pdp10-unknown-tops20
-	exit 0 ;;
+	exit ;;
     *:ITS:*:*)
 	echo pdp10-unknown-its
-	exit 0 ;;
+	exit ;;
     SEI:*:*:SEIUX)
-        echo mips-sei-seiux${UNAME_RELEASE}
-	exit 0 ;;
-    *:DRAGONFLY:*:*)
-	echo ${UNAME_MACHINE}-unknown-dragonfly${UNAME_RELEASE}
-	exit 0 ;;
+	echo mips-sei-seiux"$UNAME_RELEASE"
+	exit ;;
+    *:DragonFly:*:*)
+	echo "$UNAME_MACHINE"-unknown-dragonfly"$(echo "$UNAME_RELEASE"|sed -e 's/[-(].*//')"
+	exit ;;
+    *:*VMS:*:*)
+	UNAME_MACHINE=$( (uname -p) 2>/dev/null)
+	case "$UNAME_MACHINE" in
+	    A*) echo alpha-dec-vms ; exit ;;
+	    I*) echo ia64-dec-vms ; exit ;;
+	    V*) echo vax-dec-vms ; exit ;;
+	esac ;;
+    *:XENIX:*:SysV)
+	echo i386-pc-xenix
+	exit ;;
+    i*86:skyos:*:*)
+	echo "$UNAME_MACHINE"-pc-skyos"$(echo "$UNAME_RELEASE" | sed -e 's/ .*$//')"
+	exit ;;
+    i*86:rdos:*:*)
+	echo "$UNAME_MACHINE"-pc-rdos
+	exit ;;
+    i*86:AROS:*:*)
+	echo "$UNAME_MACHINE"-pc-aros
+	exit ;;
+    x86_64:VMkernel:*:*)
+	echo "$UNAME_MACHINE"-unknown-esx
+	exit ;;
+    amd64:Isilon\ OneFS:*:*)
+	echo x86_64-unknown-onefs
+	exit ;;
+    *:Unleashed:*:*)
+	echo "$UNAME_MACHINE"-unknown-unleashed"$UNAME_RELEASE"
+	exit ;;
 esac
 
-#echo '(No uname command or uname output not recognized.)' 1>&2
-#echo "${UNAME_MACHINE}:${UNAME_SYSTEM}:${UNAME_RELEASE}:${UNAME_VERSION}" 1>&2
-
-eval $set_cc_for_build
-cat >$dummy.c <<EOF
+# No uname command or uname output not recognized.
+set_cc_for_build
+cat > "$dummy.c" <<EOF
 #ifdef _SEQUENT_
-# include <sys/types.h>
-# include <sys/utsname.h>
+#include <sys/types.h>
+#include <sys/utsname.h>
+#endif
+#if defined(ultrix) || defined(_ultrix) || defined(__ultrix) || defined(__ultrix__)
+#if defined (vax) || defined (__vax) || defined (__vax__) || defined(mips) || defined(__mips) || defined(__mips__) || defined(MIPS) || defined(__MIPS__)
+#include <signal.h>
+#if defined(_SIZE_T_) || defined(SIGLOST)
+#include <sys/utsname.h>
+#endif
+#endif
 #endif
 main ()
 {
@@ -1255,28 +1520,20 @@ main ()
 #include <sys/param.h>
   printf ("m68k-sony-newsos%s\n",
 #ifdef NEWSOS4
-          "4"
+  "4"
 #else
-	  ""
+  ""
 #endif
-         ); exit (0);
+  ); exit (0);
 #endif
 #endif
 
-#if defined (__arm) && defined (__acorn) && defined (__unix)
-  printf ("arm-acorn-riscix"); exit (0);
-#endif
-
-#if defined (hp300) && !defined (hpux)
-  printf ("m68k-hp-bsd\n"); exit (0);
-#endif
-
 #if defined (NeXT)
 #if !defined (__ARCHITECTURE__)
 #define __ARCHITECTURE__ "m68k"
 #endif
   int version;
-  version=`(hostinfo | sed -n 's/.*NeXT Mach \([0-9]*\).*/\1/p') 2>/dev/null`;
+  version=$( (hostinfo | sed -n 's/.*NeXT Mach \([0-9]*\).*/\1/p') 2>/dev/null);
   if (version < 4)
     printf ("%s-next-nextstep%d\n", __ARCHITECTURE__, version);
   else
@@ -1310,39 +1567,54 @@ main ()
 #endif
 
 #if defined (_SEQUENT_)
-    struct utsname un;
-
-    uname(&un);
-
-    if (strncmp(un.version, "V2", 2) == 0) {
-	printf ("i386-sequent-ptx2\n"); exit (0);
-    }
-    if (strncmp(un.version, "V1", 2) == 0) { /* XXX is V1 correct? */
-	printf ("i386-sequent-ptx1\n"); exit (0);
-    }
-    printf ("i386-sequent-ptx\n"); exit (0);
+  struct utsname un;
 
+  uname(&un);
+  if (strncmp(un.version, "V2", 2) == 0) {
+    printf ("i386-sequent-ptx2\n"); exit (0);
+  }
+  if (strncmp(un.version, "V1", 2) == 0) { /* XXX is V1 correct? */
+    printf ("i386-sequent-ptx1\n"); exit (0);
+  }
+  printf ("i386-sequent-ptx\n"); exit (0);
 #endif
 
 #if defined (vax)
-# if !defined (ultrix)
-#  include <sys/param.h>
-#  if defined (BSD)
-#   if BSD == 43
-      printf ("vax-dec-bsd4.3\n"); exit (0);
-#   else
-#    if BSD == 199006
-      printf ("vax-dec-bsd4.3reno\n"); exit (0);
-#    else
-      printf ("vax-dec-bsd\n"); exit (0);
-#    endif
-#   endif
-#  else
-    printf ("vax-dec-bsd\n"); exit (0);
-#  endif
-# else
-    printf ("vax-dec-ultrix\n"); exit (0);
-# endif
+#if !defined (ultrix)
+#include <sys/param.h>
+#if defined (BSD)
+#if BSD == 43
+  printf ("vax-dec-bsd4.3\n"); exit (0);
+#else
+#if BSD == 199006
+  printf ("vax-dec-bsd4.3reno\n"); exit (0);
+#else
+  printf ("vax-dec-bsd\n"); exit (0);
+#endif
+#endif
+#else
+  printf ("vax-dec-bsd\n"); exit (0);
+#endif
+#else
+#if defined(_SIZE_T_) || defined(SIGLOST)
+  struct utsname un;
+  uname (&un);
+  printf ("vax-dec-ultrix%s\n", un.release); exit (0);
+#else
+  printf ("vax-dec-ultrix\n"); exit (0);
+#endif
+#endif
+#endif
+#if defined(ultrix) || defined(_ultrix) || defined(__ultrix) || defined(__ultrix__)
+#if defined(mips) || defined(__mips) || defined(__mips__) || defined(MIPS) || defined(__MIPS__)
+#if defined(_SIZE_T_) || defined(SIGLOST)
+  struct utsname *un;
+  uname (&un);
+  printf ("mips-dec-ultrix%s\n", un.release); exit (0);
+#else
+  printf ("mips-dec-ultrix\n"); exit (0);
+#endif
+#endif
 #endif
 
 #if defined (alliant) && defined (i860)
@@ -1353,79 +1625,73 @@ main ()
 }
 EOF
 
-$CC_FOR_BUILD -o $dummy $dummy.c 2>/dev/null && $dummy && exit 0
+$CC_FOR_BUILD -o "$dummy" "$dummy.c" 2>/dev/null && SYSTEM_NAME=$($dummy) &&
+	{ echo "$SYSTEM_NAME"; exit; }
 
 # Apollos put the system type in the environment.
+test -d /usr/apollo && { echo "$ISP-apollo-$SYSTYPE"; exit; }
 
-test -d /usr/apollo && { echo ${ISP}-apollo-${SYSTYPE}; exit 0; }
+echo "$0: unable to guess system type" >&2
 
-# Convex versions that predate uname can use getsysinfo(1)
+case "$UNAME_MACHINE:$UNAME_SYSTEM" in
+    mips:Linux | mips64:Linux)
+	# If we got here on MIPS GNU/Linux, output extra information.
+	cat >&2 <<EOF
 
-if [ -x /usr/convex/getsysinfo ]
-then
-    case `getsysinfo -f cpu_type` in
-    c1*)
-	echo c1-convex-bsd
-	exit 0 ;;
-    c2*)
-	if getsysinfo -f scalar_acc
-	then echo c32-convex-bsd
-	else echo c2-convex-bsd
-	fi
-	exit 0 ;;
-    c34*)
-	echo c34-convex-bsd
-	exit 0 ;;
-    c38*)
-	echo c38-convex-bsd
-	exit 0 ;;
-    c4*)
-	echo c4-convex-bsd
-	exit 0 ;;
-    esac
-fi
+NOTE: MIPS GNU/Linux systems require a C compiler to fully recognize
+the system type. Please install a C compiler and try again.
+EOF
+	;;
+esac
 
 cat >&2 <<EOF
-$0: unable to guess system type
 
-This script, last modified $timestamp, has failed to recognize
-the operating system you are using. It is advised that you
-download the most up to date version of the config scripts from
+This script (version $timestamp), has failed to recognize the
+operating system you are using. If your script is old, overwrite *all*
+copies of config.guess and config.sub with the latest versions from:
 
-    ftp://ftp.gnu.org/pub/gnu/config/
+  https://git.savannah.gnu.org/cgit/config.git/plain/config.guess
+and
+  https://git.savannah.gnu.org/cgit/config.git/plain/config.sub
+EOF
 
-If the version you run ($0) is already up to date, please
-send the following data and any information you think might be
-pertinent to <[email protected]> in order to provide the needed
-information to handle your system.
+year=$(echo $timestamp | sed 's,-.*,,')
+# shellcheck disable=SC2003
+if test "$(expr "$(date +%Y)" - "$year")" -lt 3 ; then
+   cat >&2 <<EOF
+
+If $0 has already been updated, send the following data and any
+information you think might be pertinent to [email protected] to
+provide the necessary information to handle your system.
 
 config.guess timestamp = $timestamp
 
-uname -m = `(uname -m) 2>/dev/null || echo unknown`
-uname -r = `(uname -r) 2>/dev/null || echo unknown`
-uname -s = `(uname -s) 2>/dev/null || echo unknown`
-uname -v = `(uname -v) 2>/dev/null || echo unknown`
+uname -m = $( (uname -m) 2>/dev/null || echo unknown)
+uname -r = $( (uname -r) 2>/dev/null || echo unknown)
+uname -s = $( (uname -s) 2>/dev/null || echo unknown)
+uname -v = $( (uname -v) 2>/dev/null || echo unknown)
 
-/usr/bin/uname -p = `(/usr/bin/uname -p) 2>/dev/null`
-/bin/uname -X     = `(/bin/uname -X) 2>/dev/null`
+/usr/bin/uname -p = $( (/usr/bin/uname -p) 2>/dev/null)
+/bin/uname -X     = $( (/bin/uname -X) 2>/dev/null)
 
-hostinfo               = `(hostinfo) 2>/dev/null`
-/bin/universe          = `(/bin/universe) 2>/dev/null`
-/usr/bin/arch -k       = `(/usr/bin/arch -k) 2>/dev/null`
-/bin/arch              = `(/bin/arch) 2>/dev/null`
-/usr/bin/oslevel       = `(/usr/bin/oslevel) 2>/dev/null`
-/usr/convex/getsysinfo = `(/usr/convex/getsysinfo) 2>/dev/null`
+hostinfo               = $( (hostinfo) 2>/dev/null)
+/bin/universe          = $( (/bin/universe) 2>/dev/null)
+/usr/bin/arch -k       = $( (/usr/bin/arch -k) 2>/dev/null)
+/bin/arch              = $( (/bin/arch) 2>/dev/null)
+/usr/bin/oslevel       = $( (/usr/bin/oslevel) 2>/dev/null)
+/usr/convex/getsysinfo = $( (/usr/convex/getsysinfo) 2>/dev/null)
 
-UNAME_MACHINE = ${UNAME_MACHINE}
-UNAME_RELEASE = ${UNAME_RELEASE}
-UNAME_SYSTEM  = ${UNAME_SYSTEM}
-UNAME_VERSION = ${UNAME_VERSION}
+UNAME_MACHINE = "$UNAME_MACHINE"
+UNAME_RELEASE = "$UNAME_RELEASE"
+UNAME_SYSTEM  = "$UNAME_SYSTEM"
+UNAME_VERSION = "$UNAME_VERSION"
 EOF
+fi
 
 exit 1
 
 # Local variables:
-# eval: (add-hook 'write-file-hooks 'time-stamp)
+# eval: (add-hook 'before-save-hook 'time-stamp)
 # time-stamp-start: "timestamp='"
 # time-stamp-format: "%:y-%02m-%02d"
 # time-stamp-end: "'"