]> ncurses.scripts.mit.edu Git - ncurses.git/blobdiff - config.guess
ncurses 6.3 - patch 20221001
[ncurses.git] / config.guess
index c7607c74f1b8db4387a814a64dc12b21145e02e6..a419d8643b62a4d2df58240785bc9b7b81c3ed52 100755 (executable)
@@ -1,14 +1,14 @@
 #! /bin/sh
 # Attempt to guess a canonical system name.
-#   Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
-#   2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
-#   Free Software Foundation, Inc.
+#   Copyright 1992-2022 Free Software Foundation, Inc.
 
-timestamp='2008-04-14'
+# shellcheck disable=SC2006,SC2268 # see below for rationale
+
+timestamp='2022-08-01'
 
 # 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
@@ -17,26 +17,30 @@ timestamp='2008-04-14'
 # 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., 51 Franklin Street - Fifth Floor, Boston, MA
-# 02110-1301, 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 <per@bothner.com>.
-# Please send patches to <config-patches@gnu.org>.  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 <config-patches@gnu.org>.
+
+
+# The "shellcheck disable" line above the timestamp inhibits complaints
+# about features and limitations of the classic Bourne shell that were
+# superseded or lifted in POSIX.  However, this script identifies a wide
+# variety of pre-POSIX systems that do not have POSIX shells at all, and
+# even some reasonably current systems (Solaris 10 as case-in-point) still
+# have a pre-POSIX /bin/sh.
+
 
 me=`echo "$0" | sed -e 's,.*/,,'`
 
@@ -45,7 +49,7 @@ 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
@@ -56,8 +60,7 @@ version="\
 GNU config.guess ($timestamp)
 
 Originally written by Per Bothner.
-Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
-2002, 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
+Copyright 1992-2022 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."
@@ -91,7 +94,8 @@ if test $# != 0; then
   exit 1
 fi
 
-trap 'exit 1' 1 2 15
+# Just in case it came from the environment.
+GUESS=
 
 # 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
@@ -103,48 +107,93 @@ 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 ;
-: ${TMPDIR=/tmp} ;
- { tmp=`(umask 077 && mktemp -d "$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=$HOST_CC ;;
-esac ; set_cc_for_build= ;'
+tmp=
+# shellcheck disable=SC2172
+trap 'test -z "$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
+    : "${TMPDIR=/tmp}"
+    # shellcheck disable=SC2039,SC3028
+    { tmp=`(umask 077 && mktemp -d "$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.
 # (ghazi@noc.rutgers.edu 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_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
+       cc_set_libc=`$CC_FOR_BUILD -E "$dummy.c" 2>/dev/null | grep '^LIBC' | sed 's, ,,g'`
+       eval "$cc_set_libc"
+
+       # Second heuristic to detect musl libc.
+       if [ "$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
@@ -153,24 +202,34 @@ 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 -n hw.machine_arch 2>/dev/null || \
+           /usr/sbin/sysctl -n hw.machine_arch 2>/dev/null || \
+           echo unknown)`
+       case $UNAME_MACHINE_ARCH in
+           aarch64eb) machine=aarch64_be-unknown ;;
            armeb) machine=armeb-unknown ;;
            arm*) machine=arm-unknown ;;
            sh3el) machine=shl-unknown ;;
            sh3eb) machine=sh-unknown ;;
            sh5el) machine=sh5le-unknown ;;
-           *) machine=${UNAME_MACHINE_ARCH}-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__ | $CC_FOR_BUILD -E - 2>/dev/null \
-                       | grep __ELF__ >/dev/null
+                       | grep -q __ELF__
                then
                    # Once all utilities can be ECOFF (netbsdecoff) or a.out (netbsdaout).
                    # Return netbsd for either.  FIX?
@@ -180,7 +239,14 @@ case "${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
@@ -188,42 +254,74 @@ 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}${release}"
-       exit ;;
+       GUESS=$machine-${os}${release}${abi-}
+       ;;
+    *:Bitrig:*:*)
+       UNAME_MACHINE_ARCH=`arch | sed 's/Bitrig.//'`
+       GUESS=$UNAME_MACHINE_ARCH-unknown-bitrig$UNAME_RELEASE
+       ;;
     *:OpenBSD:*:*)
        UNAME_MACHINE_ARCH=`arch | sed 's/OpenBSD.//'`
-       echo ${UNAME_MACHINE_ARCH}-unknown-openbsd${UNAME_RELEASE}
-       exit ;;
+       GUESS=$UNAME_MACHINE_ARCH-unknown-openbsd$UNAME_RELEASE
+       ;;
+    *:SecBSD:*:*)
+       UNAME_MACHINE_ARCH=`arch | sed 's/SecBSD.//'`
+       GUESS=$UNAME_MACHINE_ARCH-unknown-secbsd$UNAME_RELEASE
+       ;;
+    *:LibertyBSD:*:*)
+       UNAME_MACHINE_ARCH=`arch | sed 's/^.*BSD\.//'`
+       GUESS=$UNAME_MACHINE_ARCH-unknown-libertybsd$UNAME_RELEASE
+       ;;
+    *:MidnightBSD:*:*)
+       GUESS=$UNAME_MACHINE-unknown-midnightbsd$UNAME_RELEASE
+       ;;
     *:ekkoBSD:*:*)
-       echo ${UNAME_MACHINE}-unknown-ekkobsd${UNAME_RELEASE}
-       exit ;;
+       GUESS=$UNAME_MACHINE-unknown-ekkobsd$UNAME_RELEASE
+       ;;
     *:SolidBSD:*:*)
-       echo ${UNAME_MACHINE}-unknown-solidbsd${UNAME_RELEASE}
-       exit ;;
+       GUESS=$UNAME_MACHINE-unknown-solidbsd$UNAME_RELEASE
+       ;;
+    *:OS108:*:*)
+       GUESS=$UNAME_MACHINE-unknown-os108_$UNAME_RELEASE
+       ;;
     macppc:MirBSD:*:*)
-       echo powerpc-unknown-mirbsd${UNAME_RELEASE}
-       exit ;;
+       GUESS=powerpc-unknown-mirbsd$UNAME_RELEASE
+       ;;
     *:MirBSD:*:*)
-       echo ${UNAME_MACHINE}-unknown-mirbsd${UNAME_RELEASE}
-       exit ;;
+       GUESS=$UNAME_MACHINE-unknown-mirbsd$UNAME_RELEASE
+       ;;
+    *:Sortix:*:*)
+       GUESS=$UNAME_MACHINE-unknown-sortix
+       ;;
+    *:Twizzler:*:*)
+       GUESS=$UNAME_MACHINE-unknown-twizzler
+       ;;
+    *:Redox:*:*)
+       GUESS=$UNAME_MACHINE-unknown-redox
+       ;;
+    mips:OSF1:*.*)
+       GUESS=mips-dec-osf1
+       ;;
     alpha:OSF1:*:*)
+       # Reset EXIT trap before exiting to avoid spurious non-zero exit code.
+       trap '' 0
        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}'`
+               UNAME_RELEASE=`/usr/sbin/sizer -v | awk '{print $4}'`
                ;;
        esac
        # According to Compaq, /usr/sbin/psrinfo has been available on
@@ -231,141 +329,158 @@ case "${UNAME_MACHINE}:${UNAME_SYSTEM}:${UNAME_RELEASE}:${UNAME_VERSION}" in
        # 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.*$/\1/p' | head -n 1`
-       case "$ALPHA_CPU_TYPE" in
+       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 ${UNAME_RELEASE} | sed -e 's/^[PVTX]//' | tr 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' 'abcdefghijklmnopqrstuvwxyz'`
-       exit ;;
-    Alpha\ *:Windows_NT*:*)
-       # How do we know it's Interix rather than the generic POSIX subsystem?
-       # Should we change UNAME_MACHINE based on the output of uname instead
-       # of the specific Alpha model?
-       echo alpha-pc-interix
-       exit ;;
-    21064:Windows_NT:50:3)
-       echo alpha-dec-winnt3.5
-       exit ;;
+       OSF_REL=`echo "$UNAME_RELEASE" | sed -e 's/^[PVTX]//' | tr ABCDEFGHIJKLMNOPQRSTUVWXYZ abcdefghijklmnopqrstuvwxyz`
+       GUESS=$UNAME_MACHINE-dec-osf$OSF_REL
+       ;;
     Amiga*:UNIX_System_V:4.0:*)
-       echo m68k-unknown-sysv4
-       exit ;;
+       GUESS=m68k-unknown-sysv4
+       ;;
     *:[Aa]miga[Oo][Ss]:*:*)
-       echo ${UNAME_MACHINE}-unknown-amigaos
-       exit ;;
+       GUESS=$UNAME_MACHINE-unknown-amigaos
+       ;;
     *:[Mm]orph[Oo][Ss]:*:*)
-       echo ${UNAME_MACHINE}-unknown-morphos
-       exit ;;
+       GUESS=$UNAME_MACHINE-unknown-morphos
+       ;;
     *:OS/390:*:*)
-       echo i370-ibm-openedition
-       exit ;;
+       GUESS=i370-ibm-openedition
+       ;;
     *:z/VM:*:*)
-       echo s390-ibm-zvmoe
-       exit ;;
+       GUESS=s390-ibm-zvmoe
+       ;;
     *:OS400:*:*)
-        echo powerpc-ibm-os400
-       exit ;;
+       GUESS=powerpc-ibm-os400
+       ;;
     arm:RISC*:1.[012]*:*|arm:riscix:1.[012]*:*)
-       echo arm-acorn-riscix${UNAME_RELEASE}
-       exit ;;
-    arm:riscos:*:*|arm:RISCOS:*:*)
-       echo arm-unknown-riscos
-       exit ;;
+       GUESS=arm-acorn-riscix$UNAME_RELEASE
+       ;;
+    arm*:riscos:*:*|arm*:RISCOS:*:*)
+       GUESS=arm-unknown-riscos
+       ;;
     SR2?01:HI-UX/MPP:*:* | SR8000:HI-UX/MPP:*:*)
-       echo hppa1.1-hitachi-hiuxmpp
-       exit ;;
+       GUESS=hppa1.1-hitachi-hiuxmpp
+       ;;
     Pyramid*:OSx*:*:* | MIS*:OSx*:*:* | MIS*:SMP_DC-OSx*:*:*)
        # akee@wpdis03.wpafb.af.mil (Earle F. Ake) contributed MIS and NILE.
-       if test "`(/bin/universe) 2>/dev/null`" = att ; then
-               echo pyramid-pyramid-sysv3
-       else
-               echo pyramid-pyramid-bsd
-       fi
-       exit ;;
+       case `(/bin/universe) 2>/dev/null` in
+           att) GUESS=pyramid-pyramid-sysv3 ;;
+           *)   GUESS=pyramid-pyramid-bsd   ;;
+       esac
+       ;;
     NILE*:*:*:dcosx)
-       echo pyramid-pyramid-svr4
-       exit ;;
+       GUESS=pyramid-pyramid-svr4
+       ;;
     DRS?6000:unix:4.0:6*)
-       echo sparc-icl-nx6
-       exit ;;
+       GUESS=sparc-icl-nx6
+       ;;
     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 ;;
+           sparc) GUESS=sparc-icl-nx7 ;;
+       esac
+       ;;
+    s390x:SunOS:*:*)
+       SUN_REL=`echo "$UNAME_RELEASE" | sed -e 's/[^.]*//'`
+       GUESS=$UNAME_MACHINE-ibm-solaris2$SUN_REL
+       ;;
     sun4H:SunOS:5.*:*)
-       echo sparc-hal-solaris2`echo ${UNAME_RELEASE}|sed -e 's/[^.]*//'`
-       exit ;;
+       SUN_REL=`echo "$UNAME_RELEASE" | sed -e 's/[^.]*//'`
+       GUESS=sparc-hal-solaris2$SUN_REL
+       ;;
     sun4*:SunOS:5.*:* | tadpole*:SunOS:5.*:*)
-       echo sparc-sun-solaris2`echo ${UNAME_RELEASE}|sed -e 's/[^.]*//'`
-       exit ;;
+       SUN_REL=`echo "$UNAME_RELEASE" | sed -e 's/[^.]*//'`
+       GUESS=sparc-sun-solaris2$SUN_REL
+       ;;
+    i86pc:AuroraUX:5.*:* | i86xen:AuroraUX:5.*:*)
+       GUESS=i386-pc-auroraux$UNAME_RELEASE
+       ;;
     i86pc:SunOS:5.*:* | i86xen:SunOS:5.*:*)
-       echo i386-pc-solaris2`echo ${UNAME_RELEASE}|sed -e 's/[^.]*//'`
-       exit ;;
+       set_cc_for_build
+       SUN_ARCH=i386
+       # If there is a compiler, see if it is configured for 64-bit objects.
+       # Note that the Sun cc does not turn __LP64__ into 1 like gcc does.
+       # This test works for both compilers.
+       if test "$CC_FOR_BUILD" != no_compiler_found; then
+           if (echo '#ifdef __amd64'; echo IS_64BIT_ARCH; echo '#endif') | \
+               (CCOPTS="" $CC_FOR_BUILD -m64 -E - 2>/dev/null) | \
+               grep IS_64BIT_ARCH >/dev/null
+           then
+               SUN_ARCH=x86_64
+           fi
+       fi
+       SUN_REL=`echo "$UNAME_RELEASE" | sed -e 's/[^.]*//'`
+       GUESS=$SUN_ARCH-pc-solaris2$SUN_REL
+       ;;
     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 ${UNAME_RELEASE}|sed -e 's/[^.]*//'`
-       exit ;;
+       SUN_REL=`echo "$UNAME_RELEASE" | sed -e 's/[^.]*//'`
+       GUESS=sparc-sun-solaris3$SUN_REL
+       ;;
     sun4*:SunOS:*:*)
-       case "`/usr/bin/arch -k`" in
+       case `/usr/bin/arch -k` in
            Series*|S4*)
                UNAME_RELEASE=`uname -v`
                ;;
        esac
        # Japanese Language versions have a version number like `4.1.3-JL'.
-       echo sparc-sun-sunos`echo ${UNAME_RELEASE}|sed -e 's/-/_/'`
-       exit ;;
+       SUN_REL=`echo "$UNAME_RELEASE" | sed -e 's/-/_/'`
+       GUESS=sparc-sun-sunos$SUN_REL
+       ;;
     sun3*:SunOS:*:*)
-       echo m68k-sun-sunos${UNAME_RELEASE}
-       exit ;;
+       GUESS=m68k-sun-sunos$UNAME_RELEASE
+       ;;
     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
+       test "x$UNAME_RELEASE" = x && UNAME_RELEASE=3
+       case `/bin/arch` in
            sun3)
-               echo m68k-sun-sunos${UNAME_RELEASE}
+               GUESS=m68k-sun-sunos$UNAME_RELEASE
                ;;
            sun4)
-               echo sparc-sun-sunos${UNAME_RELEASE}
+               GUESS=sparc-sun-sunos$UNAME_RELEASE
                ;;
        esac
-       exit ;;
+       ;;
     aushp:SunOS:*:*)
-       echo sparc-auspex-sunos${UNAME_RELEASE}
-       exit ;;
+       GUESS=sparc-auspex-sunos$UNAME_RELEASE
+       ;;
     # The situation for MiNT is a little confusing.  The machine name
     # can be virtually everything (everything which is not
     # "atarist" or "atariste" at least should have a processor
@@ -375,44 +490,44 @@ case "${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 ;;
+       GUESS=m68k-atari-mint$UNAME_RELEASE
+       ;;
     atari*:*MiNT:*:* | atari*:*mint:*:* | atarist[e]:*TOS:*:*)
-       echo m68k-atari-mint${UNAME_RELEASE}
-        exit ;;
+       GUESS=m68k-atari-mint$UNAME_RELEASE
+       ;;
     *falcon*:*MiNT:*:* | *falcon*:*mint:*:* | *falcon*:*TOS:*:*)
-        echo m68k-atari-mint${UNAME_RELEASE}
-       exit ;;
+       GUESS=m68k-atari-mint$UNAME_RELEASE
+       ;;
     milan*:*MiNT:*:* | milan*:*mint:*:* | *milan*:*TOS:*:*)
-        echo m68k-milan-mint${UNAME_RELEASE}
-        exit ;;
+       GUESS=m68k-milan-mint$UNAME_RELEASE
+       ;;
     hades*:*MiNT:*:* | hades*:*mint:*:* | *hades*:*TOS:*:*)
-        echo m68k-hades-mint${UNAME_RELEASE}
-        exit ;;
+       GUESS=m68k-hades-mint$UNAME_RELEASE
+       ;;
     *:*MiNT:*:* | *:*mint:*:* | *:*TOS:*:*)
-        echo m68k-unknown-mint${UNAME_RELEASE}
-        exit ;;
+       GUESS=m68k-unknown-mint$UNAME_RELEASE
+       ;;
     m68k:machten:*:*)
-       echo m68k-apple-machten${UNAME_RELEASE}
-       exit ;;
+       GUESS=m68k-apple-machten$UNAME_RELEASE
+       ;;
     powerpc:machten:*:*)
-       echo powerpc-apple-machten${UNAME_RELEASE}
-       exit ;;
+       GUESS=powerpc-apple-machten$UNAME_RELEASE
+       ;;
     RISC*:Mach:*:*)
-       echo mips-dec-mach_bsd4.3
-       exit ;;
+       GUESS=mips-dec-mach_bsd4.3
+       ;;
     RISC*:ULTRIX:*:*)
-       echo mips-dec-ultrix${UNAME_RELEASE}
-       exit ;;
+       GUESS=mips-dec-ultrix$UNAME_RELEASE
+       ;;
     VAX*:ULTRIX*:*:*)
-       echo vax-dec-ultrix${UNAME_RELEASE}
-       exit ;;
+       GUESS=vax-dec-ultrix$UNAME_RELEASE
+       ;;
     2020:CLIX:*:* | 2430:CLIX:*:*)
-       echo clipper-intergraph-clix${UNAME_RELEASE}
-       exit ;;
+       GUESS=clipper-intergraph-clix$UNAME_RELEASE
+       ;;
     mips:*:*:UMIPS | mips:*:*:RISCos)
-       eval $set_cc_for_build
-       sed 's/^        //' << EOF >$dummy.c
+       set_cc_for_build
+       sed 's/^        //' << EOF > "$dummy.c"
 #ifdef __cplusplus
 #include <stdio.h>  /* for printf() prototype */
        int main (int argc, char *argv[]) {
@@ -421,95 +536,96 @@ case "${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 $dummy.c &&
-         dummyarg=`echo "${UNAME_RELEASE}" | sed -n 's/\([0-9]*\).*/\1/p'` &&
-         SYSTEM_NAME=`$dummy $dummyarg` &&
+       $CC_FOR_BUILD -o "$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 ;;
+       GUESS=mips-mips-riscos$UNAME_RELEASE
+       ;;
     Motorola:PowerMAX_OS:*:*)
-       echo powerpc-motorola-powermax
-       exit ;;
+       GUESS=powerpc-motorola-powermax
+       ;;
     Motorola:*:4.3:PL8-*)
-       echo powerpc-harris-powermax
-       exit ;;
+       GUESS=powerpc-harris-powermax
+       ;;
     Night_Hawk:*:*:PowerMAX_OS | Synergy:PowerMAX_OS:*:*)
-       echo powerpc-harris-powermax
-       exit ;;
+       GUESS=powerpc-harris-powermax
+       ;;
     Night_Hawk:Power_UNIX:*:*)
-       echo powerpc-harris-powerunix
-       exit ;;
+       GUESS=powerpc-harris-powerunix
+       ;;
     m88k:CX/UX:7*:*)
-       echo m88k-harris-cxux7
-       exit ;;
+       GUESS=m88k-harris-cxux7
+       ;;
     m88k:*:4*:R4*)
-       echo m88k-motorola-sysv4
-       exit ;;
+       GUESS=m88k-motorola-sysv4
+       ;;
     m88k:*:3*:R3*)
-       echo m88k-motorola-sysv3
-       exit ;;
+       GUESS=m88k-motorola-sysv3
+       ;;
     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}
+               GUESS=m88k-dg-dgux$UNAME_RELEASE
            else
-               echo m88k-dg-dguxbcs${UNAME_RELEASE}
+               GUESS=m88k-dg-dguxbcs$UNAME_RELEASE
            fi
        else
-           echo i586-dg-dgux${UNAME_RELEASE}
+           GUESS=i586-dg-dgux$UNAME_RELEASE
        fi
-       exit ;;
+       ;;
     M88*:DolphinOS:*:*)        # DolphinOS (SVR3)
-       echo m88k-dolphin-sysv3
-       exit ;;
+       GUESS=m88k-dolphin-sysv3
+       ;;
     M88*:*:R3*:*)
        # Delta 88k system running SVR3
-       echo m88k-motorola-sysv3
-       exit ;;
+       GUESS=m88k-motorola-sysv3
+       ;;
     XD88*:*:*:*) # Tektronix XD88 system running UTekV (SVR3)
-       echo m88k-tektronix-sysv3
-       exit ;;
+       GUESS=m88k-tektronix-sysv3
+       ;;
     Tek43[0-9][0-9]:UTek:*:*) # Tektronix 4300 system running UTek (BSD)
-       echo m68k-tektronix-bsd
-       exit ;;
+       GUESS=m68k-tektronix-bsd
+       ;;
     *:IRIX*:*:*)
-       echo mips-sgi-irix`echo ${UNAME_RELEASE}|sed -e 's/-/_/g'`
-       exit ;;
+       IRIX_REL=`echo "$UNAME_RELEASE" | sed -e 's/-/_/g'`
+       GUESS=mips-sgi-irix$IRIX_REL
+       ;;
     ????????:AIX?:[12].1:2)   # AIX 2.2.1 or AIX 2.1.1 is RT/PC AIX.
-       echo romp-ibm-aix     # uname -m gives an 8 hex-code CPU id
-       exit ;;               # Note that: echo "'`uname -s`'" gives 'AIX '
+       GUESS=romp-ibm-aix    # uname -m gives an 8 hex-code CPU id
+       ;;                    # Note that: echo "'`uname -s`'" gives 'AIX '
     i*86:AIX:*:*)
-       echo i386-ibm-aix
-       exit ;;
+       GUESS=i386-ibm-aix
+       ;;
     ia64:AIX:*:*)
-       if [ -x /usr/bin/oslevel ] ; then
+       if test -x /usr/bin/oslevel ; then
                IBM_REV=`/usr/bin/oslevel`
        else
-               IBM_REV=${UNAME_VERSION}.${UNAME_RELEASE}
+               IBM_REV=$UNAME_VERSION.$UNAME_RELEASE
        fi
-       echo ${UNAME_MACHINE}-ibm-aix${IBM_REV}
-       exit ;;
+       GUESS=$UNAME_MACHINE-ibm-aix$IBM_REV
+       ;;
     *: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()
@@ -520,115 +636,116 @@ EOF
                        exit(0);
                        }
 EOF
-               if $CC_FOR_BUILD -o $dummy $dummy.c && SYSTEM_NAME=`$dummy`
+               if $CC_FOR_BUILD -o "$dummy" "$dummy.c" && SYSTEM_NAME=`"$dummy"`
                then
-                       echo "$SYSTEM_NAME"
+                       GUESS=$SYSTEM_NAME
                else
-                       echo rs6000-ibm-aix3.2.5
+                       GUESS=rs6000-ibm-aix3.2.5
                fi
        elif grep bos324 /usr/include/stdio.h >/dev/null 2>&1; then
-               echo rs6000-ibm-aix3.2.4
+               GUESS=rs6000-ibm-aix3.2.4
        else
-               echo rs6000-ibm-aix3.2
+               GUESS=rs6000-ibm-aix3.2
        fi
-       exit ;;
-    *:AIX:*:[456])
+       ;;
+    *:AIX:*:[4567])
        IBM_CPU_ID=`/usr/sbin/lsdev -C -c processor -S available | sed 1q | awk '{ print $1 }'`
-       if /usr/sbin/lsattr -El ${IBM_CPU_ID} | grep ' POWER' >/dev/null 2>&1; then
+       if /usr/sbin/lsattr -El "$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 ;;
+       GUESS=$IBM_ARCH-ibm-aix$IBM_REV
+       ;;
     *:AIX:*:*)
-       echo rs6000-ibm-aix
-       exit ;;
-    ibmrt:4.4BSD:*|romp-ibm:BSD:*)
-       echo romp-ibm-bsd4.4
-       exit ;;
+       GUESS=rs6000-ibm-aix
+       ;;
+    ibmrt:4.4BSD:*|romp-ibm:4.4BSD:*)
+       GUESS=romp-ibm-bsd4.4
+       ;;
     ibmrt:*BSD:*|romp-ibm:BSD:*)            # covers RT/PC BSD and
-       echo romp-ibm-bsd${UNAME_RELEASE}   # 4.3 with uname added to
-       exit ;;                             # report: romp-ibm BSD 4.3
+       GUESS=romp-ibm-bsd$UNAME_RELEASE    # 4.3 with uname added to
+       ;;                                  # report: romp-ibm BSD 4.3
     *:BOSX:*:*)
-       echo rs6000-bull-bosx
-       exit ;;
+       GUESS=rs6000-bull-bosx
+       ;;
     DPX/2?00:B.O.S.:*:*)
-       echo m68k-bull-sysv3
-       exit ;;
+       GUESS=m68k-bull-sysv3
+       ;;
     9000/[34]??:4.3bsd:1.*:*)
-       echo m68k-hp-bsd
-       exit ;;
+       GUESS=m68k-hp-bsd
+       ;;
     hp300:4.4BSD:*:* | 9000/[34]??:4.3bsd:2.*:*)
-       echo m68k-hp-bsd4.4
-       exit ;;
+       GUESS=m68k-hp-bsd4.4
+       ;;
     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 $UNAME_MACHINE in
+           9000/31?)            HP_ARCH=m68000 ;;
+           9000/[34]??)         HP_ARCH=m68k ;;
            9000/[678][0-9][0-9])
-               if [ -x /usr/bin/getconf ]; then
+               if test -x /usr/bin/getconf; then
                    sc_cpu_version=`/usr/bin/getconf SC_CPU_VERSION 2>/dev/null`
-                    sc_kernel_bits=`/usr/bin/getconf SC_KERNEL_BITS 2>/dev/null`
-                    case "${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
+                   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
-
-              #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);
-
-                  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);
-              }
+               if test "$HP_ARCH" = ""; then
+                   set_cc_for_build
+                   sed 's/^            //' << EOF > "$dummy.c"
+
+               #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);
+
+                   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
-           eval $set_cc_for_build
+           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
@@ -639,23 +756,23 @@ EOF
            # $ CC_FOR_BUILD="cc +DA2.0w" ./config.guess
            # => hppa64-hp-hpux11.23
 
-           if echo __LP64__ | (CCOPTS= $CC_FOR_BUILD -E - 2>/dev/null) |
-               grep __LP64__ >/dev/null
+           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 ;;
+       GUESS=$HP_ARCH-hp-hpux$HPUX_REV
+       ;;
     ia64:HP-UX:*:*)
-       HPUX_REV=`echo ${UNAME_RELEASE}|sed -e 's/[^.]*.[0B]*//'`
-       echo ia64-hp-hpux${HPUX_REV}
-       exit ;;
+       HPUX_REV=`echo "$UNAME_RELEASE" | sed -e 's/[^.]*.[0B]*//'`
+       GUESS=ia64-hp-hpux$HPUX_REV
+       ;;
     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 ()
@@ -680,408 +797,440 @@ EOF
          exit (0);
        }
 EOF
-       $CC_FOR_BUILD -o $dummy $dummy.c && SYSTEM_NAME=`$dummy` &&
+       $CC_FOR_BUILD -o "$dummy" "$dummy.c" && SYSTEM_NAME=`"$dummy"` &&
                { echo "$SYSTEM_NAME"; exit; }
-       echo unknown-hitachi-hiuxwe2
-       exit ;;
-    9000/7??:4.3bsd:*:* | 9000/8?[79]:4.3bsd:*:* )
-       echo hppa1.1-hp-bsd
-       exit ;;
+       GUESS=unknown-hitachi-hiuxwe2
+       ;;
+    9000/7??:4.3bsd:*:* | 9000/8?[79]:4.3bsd:*:*)
+       GUESS=hppa1.1-hp-bsd
+       ;;
     9000/8??:4.3bsd:*:*)
-       echo hppa1.0-hp-bsd
-       exit ;;
+       GUESS=hppa1.0-hp-bsd
+       ;;
     *9??*:MPE/iX:*:* | *3000*:MPE/iX:*:*)
-       echo hppa1.0-hp-mpeix
-       exit ;;
-    hp7??:OSF1:*:* | hp8?[79]:OSF1:*:* )
-       echo hppa1.1-hp-osf
-       exit ;;
+       GUESS=hppa1.0-hp-mpeix
+       ;;
+    hp7??:OSF1:*:* | hp8?[79]:OSF1:*:*)
+       GUESS=hppa1.1-hp-osf
+       ;;
     hp8??:OSF1:*:*)
-       echo hppa1.0-hp-osf
-       exit ;;
+       GUESS=hppa1.0-hp-osf
+       ;;
     i*86:OSF1:*:*)
-       if [ -x /usr/sbin/sysversion ] ; then
-           echo ${UNAME_MACHINE}-unknown-osf1mk
+       if test -x /usr/sbin/sysversion ; then
+           GUESS=$UNAME_MACHINE-unknown-osf1mk
        else
-           echo ${UNAME_MACHINE}-unknown-osf1
+           GUESS=$UNAME_MACHINE-unknown-osf1
        fi
-       exit ;;
+       ;;
     parisc*:Lites*:*:*)
-       echo hppa1.1-hp-lites
-       exit ;;
+       GUESS=hppa1.1-hp-lites
+       ;;
     C1*:ConvexOS:*:* | convex:ConvexOS:C1*:*)
-       echo c1-convex-bsd
-        exit ;;
+       GUESS=c1-convex-bsd
+       ;;
     C2*:ConvexOS:*:* | convex:ConvexOS:C2*:*)
        if getsysinfo -f scalar_acc
        then echo c32-convex-bsd
        else echo c2-convex-bsd
        fi
-        exit ;;
+       exit ;;
     C34*:ConvexOS:*:* | convex:ConvexOS:C34*:*)
-       echo c34-convex-bsd
-        exit ;;
+       GUESS=c34-convex-bsd
+       ;;
     C38*:ConvexOS:*:* | convex:ConvexOS:C38*:*)
-       echo c38-convex-bsd
-        exit ;;
+       GUESS=c38-convex-bsd
+       ;;
     C4*:ConvexOS:*:* | convex:ConvexOS:C4*:*)
-       echo c4-convex-bsd
-        exit ;;
+       GUESS=c4-convex-bsd
+       ;;
     CRAY*Y-MP:*:*:*)
-       echo ymp-cray-unicos${UNAME_RELEASE} | sed -e 's/\.[^.]*$/.X/'
-       exit ;;
+       CRAY_REL=`echo "$UNAME_RELEASE" | sed -e 's/\.[^.]*$/.X/'`
+       GUESS=ymp-cray-unicos$CRAY_REL
+       ;;
     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/\.[^.]*$/.X/'
        exit ;;
     CRAY*TS:*:*:*)
-       echo t90-cray-unicos${UNAME_RELEASE} | sed -e 's/\.[^.]*$/.X/'
-       exit ;;
+       CRAY_REL=`echo "$UNAME_RELEASE" | sed -e 's/\.[^.]*$/.X/'`
+       GUESS=t90-cray-unicos$CRAY_REL
+       ;;
     CRAY*T3E:*:*:*)
-       echo alphaev5-cray-unicosmk${UNAME_RELEASE} | sed -e 's/\.[^.]*$/.X/'
-       exit ;;
+       CRAY_REL=`echo "$UNAME_RELEASE" | sed -e 's/\.[^.]*$/.X/'`
+       GUESS=alphaev5-cray-unicosmk$CRAY_REL
+       ;;
     CRAY*SV1:*:*:*)
-       echo sv1-cray-unicos${UNAME_RELEASE} | sed -e 's/\.[^.]*$/.X/'
-       exit ;;
+       CRAY_REL=`echo "$UNAME_RELEASE" | sed -e 's/\.[^.]*$/.X/'`
+       GUESS=sv1-cray-unicos$CRAY_REL
+       ;;
     *:UNICOS/mp:*:*)
-       echo craynv-cray-unicosmp${UNAME_RELEASE} | sed -e 's/\.[^.]*$/.X/'
-       exit ;;
+       CRAY_REL=`echo "$UNAME_RELEASE" | sed -e 's/\.[^.]*$/.X/'`
+       GUESS=craynv-cray-unicosmp$CRAY_REL
+       ;;
     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 ;;
+       FUJITSU_PROC=`uname -m | tr ABCDEFGHIJKLMNOPQRSTUVWXYZ abcdefghijklmnopqrstuvwxyz`
+       FUJITSU_SYS=`uname -p | tr ABCDEFGHIJKLMNOPQRSTUVWXYZ abcdefghijklmnopqrstuvwxyz | sed -e 's/\///'`
+       FUJITSU_REL=`echo "$UNAME_RELEASE" | sed -e 's/ /_/'`
+       GUESS=${FUJITSU_PROC}-fujitsu-${FUJITSU_SYS}${FUJITSU_REL}
+       ;;
     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}${FUJITSU_REL}"
-       exit ;;
+       FUJITSU_SYS=`uname -p | tr ABCDEFGHIJKLMNOPQRSTUVWXYZ abcdefghijklmnopqrstuvwxyz | sed -e 's/\///'`
+       FUJITSU_REL=`echo "$UNAME_RELEASE" | tr ABCDEFGHIJKLMNOPQRSTUVWXYZ abcdefghijklmnopqrstuvwxyz | sed -e 's/ /_/'`
+       GUESS=sparc-fujitsu-${FUJITSU_SYS}${FUJITSU_REL}
+       ;;
     i*86:BSD/386:*:* | i*86:BSD/OS:*:* | *:Ascend\ Embedded/OS:*:*)
-       echo ${UNAME_MACHINE}-pc-bsdi${UNAME_RELEASE}
-       exit ;;
+       GUESS=$UNAME_MACHINE-pc-bsdi$UNAME_RELEASE
+       ;;
     sparc*:BSD/OS:*:*)
-       echo sparc-unknown-bsdi${UNAME_RELEASE}
-       exit ;;
+       GUESS=sparc-unknown-bsdi$UNAME_RELEASE
+       ;;
     *:BSD/OS:*:*)
-       echo ${UNAME_MACHINE}-unknown-bsdi${UNAME_RELEASE}
-       exit ;;
+       GUESS=$UNAME_MACHINE-unknown-bsdi$UNAME_RELEASE
+       ;;
+    arm:FreeBSD:*:*)
+       UNAME_PROCESSOR=`uname -p`
+       set_cc_for_build
+       if echo __ARM_PCS_VFP | $CC_FOR_BUILD -E - 2>/dev/null \
+           | grep -q __ARM_PCS_VFP
+       then
+           FREEBSD_REL=`echo "$UNAME_RELEASE" | sed -e 's/[-(].*//'`
+           GUESS=$UNAME_PROCESSOR-unknown-freebsd$FREEBSD_REL-gnueabi
+       else
+           FREEBSD_REL=`echo "$UNAME_RELEASE" | sed -e 's/[-(].*//'`
+           GUESS=$UNAME_PROCESSOR-unknown-freebsd$FREEBSD_REL-gnueabihf
+       fi
+       ;;
     *:FreeBSD:*:*)
-       case ${UNAME_MACHINE} in
-           pc98)
-               echo i386-unknown-freebsd`echo ${UNAME_RELEASE}|sed -e 's/[-(].*//'` ;;
+       UNAME_PROCESSOR=`/usr/bin/uname -p`
+       case $UNAME_PROCESSOR in
            amd64)
-               echo x86_64-unknown-freebsd`echo ${UNAME_RELEASE}|sed -e 's/[-(].*//'` ;;
-           *)
-               echo ${UNAME_MACHINE}-unknown-freebsd`echo ${UNAME_RELEASE}|sed -e 's/[-(].*//'` ;;
+               UNAME_PROCESSOR=x86_64 ;;
+           i386)
+               UNAME_PROCESSOR=i586 ;;
        esac
-       exit ;;
+       FREEBSD_REL=`echo "$UNAME_RELEASE" | sed -e 's/[-(].*//'`
+       GUESS=$UNAME_PROCESSOR-unknown-freebsd$FREEBSD_REL
+       ;;
     i*:CYGWIN*:*)
-       echo ${UNAME_MACHINE}-pc-cygwin
-       exit ;;
+       GUESS=$UNAME_MACHINE-pc-cygwin
+       ;;
+    *:MINGW64*:*)
+       GUESS=$UNAME_MACHINE-pc-mingw64
+       ;;
     *:MINGW*:*)
-       echo ${UNAME_MACHINE}-pc-mingw32
-       exit ;;
-    i*:windows32*:*)
-       # uname -m includes "-pc" on this system.
-       echo ${UNAME_MACHINE}-mingw32
-       exit ;;
+       GUESS=$UNAME_MACHINE-pc-mingw32
+       ;;
+    *:MSYS*:*)
+       GUESS=$UNAME_MACHINE-pc-msys
+       ;;
     i*:PW*:*)
-       echo ${UNAME_MACHINE}-pc-pw32
-       exit ;;
-    *:Interix*:[3456]*)
-       case ${UNAME_MACHINE} in
+       GUESS=$UNAME_MACHINE-pc-pw32
+       ;;
+    *:SerenityOS:*:*)
+        GUESS=$UNAME_MACHINE-pc-serenity
+        ;;
+    *:Interix*:*)
+       case $UNAME_MACHINE in
            x86)
-               echo i586-pc-interix${UNAME_RELEASE}
-               exit ;;
-           EM64T | authenticamd)
-               echo x86_64-unknown-interix${UNAME_RELEASE}
-               exit ;;
+               GUESS=i586-pc-interix$UNAME_RELEASE
+               ;;
+           authenticamd | genuineintel | EM64T)
+               GUESS=x86_64-unknown-interix$UNAME_RELEASE
+               ;;
            IA64)
-               echo ia64-unknown-interix${UNAME_RELEASE}
-               exit ;;
+               GUESS=ia64-unknown-interix$UNAME_RELEASE
+               ;;
        esac ;;
-    [345]86:Windows_95:* | [345]86:Windows_98:* | [345]86:Windows_NT:*)
-       echo i${UNAME_MACHINE}-pc-mks
-       exit ;;
-    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 ;;
     i*:UWIN*:*)
-       echo ${UNAME_MACHINE}-pc-uwin
-       exit ;;
+       GUESS=$UNAME_MACHINE-pc-uwin
+       ;;
     amd64:CYGWIN*:*:* | x86_64:CYGWIN*:*:*)
-       echo x86_64-unknown-cygwin
-       exit ;;
-    p*:CYGWIN*:*)
-       echo powerpcle-unknown-cygwin
-       exit ;;
+       GUESS=x86_64-pc-cygwin
+       ;;
     prep*:SunOS:5.*:*)
-       echo powerpcle-unknown-solaris2`echo ${UNAME_RELEASE}|sed -e 's/[^.]*//'`
-       exit ;;
+       SUN_REL=`echo "$UNAME_RELEASE" | sed -e 's/[^.]*//'`
+       GUESS=powerpcle-unknown-solaris2$SUN_REL
+       ;;
     *:GNU:*:*)
        # the GNU system
-       echo `echo ${UNAME_MACHINE}|sed -e 's,[-/].*$,,'`-unknown-gnu`echo ${UNAME_RELEASE}|sed -e 's,/.*$,,'`
-       exit ;;
+       GNU_ARCH=`echo "$UNAME_MACHINE" | sed -e 's,[-/].*$,,'`
+       GNU_REL=`echo "$UNAME_RELEASE" | sed -e 's,/.*$,,'`
+       GUESS=$GNU_ARCH-unknown-$LIBC$GNU_REL
+       ;;
     *: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 ;;
-    i*86:Minix:*:*)
-       echo ${UNAME_MACHINE}-pc-minix
-       exit ;;
+       GNU_SYS=`echo "$UNAME_SYSTEM" | sed 's,^[^/]*/,,' | tr "[:upper:]" "[:lower:]"`
+       GNU_REL=`echo "$UNAME_RELEASE" | sed -e 's/[-(].*//'`
+       GUESS=$UNAME_MACHINE-unknown-$GNU_SYS$GNU_REL-$LIBC
+       ;;
+    *:Minix:*:*)
+       GUESS=$UNAME_MACHINE-unknown-minix
+       ;;
+    aarch64:Linux:*:*)
+       GUESS=$UNAME_MACHINE-unknown-linux-$LIBC
+       ;;
+    aarch64_be:Linux:*:*)
+       UNAME_MACHINE=aarch64_be
+       GUESS=$UNAME_MACHINE-unknown-linux-$LIBC
+       ;;
+    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 "$?" = 0 ; then LIBC=gnulibc1 ; fi
+       GUESS=$UNAME_MACHINE-unknown-linux-$LIBC
+       ;;
+    arc:Linux:*:* | arceb:Linux:*:* | arc32:Linux:*:* | arc64:Linux:*:*)
+       GUESS=$UNAME_MACHINE-unknown-linux-$LIBC
+       ;;
     arm*:Linux:*:*)
-       eval $set_cc_for_build
+       set_cc_for_build
        if echo __ARM_EABI__ | $CC_FOR_BUILD -E - 2>/dev/null \
            | grep -q __ARM_EABI__
        then
-           echo ${UNAME_MACHINE}-unknown-linux-gnu
+           GUESS=$UNAME_MACHINE-unknown-linux-$LIBC
        else
-           echo ${UNAME_MACHINE}-unknown-linux-gnueabi
+           if echo __ARM_PCS_VFP | $CC_FOR_BUILD -E - 2>/dev/null \
+               | grep -q __ARM_PCS_VFP
+           then
+               GUESS=$UNAME_MACHINE-unknown-linux-${LIBC}eabi
+           else
+               GUESS=$UNAME_MACHINE-unknown-linux-${LIBC}eabihf
+           fi
        fi
-       exit ;;
+       ;;
     avr32*:Linux:*:*)
-       echo ${UNAME_MACHINE}-unknown-linux-gnu
-       exit ;;
+       GUESS=$UNAME_MACHINE-unknown-linux-$LIBC
+       ;;
     cris:Linux:*:*)
-       echo cris-axis-linux-gnu
-       exit ;;
+       GUESS=$UNAME_MACHINE-axis-linux-$LIBC
+       ;;
     crisv32:Linux:*:*)
-       echo crisv32-axis-linux-gnu
-       exit ;;
+       GUESS=$UNAME_MACHINE-axis-linux-$LIBC
+       ;;
+    e2k:Linux:*:*)
+       GUESS=$UNAME_MACHINE-unknown-linux-$LIBC
+       ;;
     frv:Linux:*:*)
-       echo frv-unknown-linux-gnu
-       exit ;;
+       GUESS=$UNAME_MACHINE-unknown-linux-$LIBC
+       ;;
+    hexagon:Linux:*:*)
+       GUESS=$UNAME_MACHINE-unknown-linux-$LIBC
+       ;;
+    i*86:Linux:*:*)
+       GUESS=$UNAME_MACHINE-pc-linux-$LIBC
+       ;;
     ia64:Linux:*:*)
-       echo ${UNAME_MACHINE}-unknown-linux-gnu
-       exit ;;
+       GUESS=$UNAME_MACHINE-unknown-linux-$LIBC
+       ;;
+    k1om:Linux:*:*)
+       GUESS=$UNAME_MACHINE-unknown-linux-$LIBC
+       ;;
+    loongarch32:Linux:*:* | loongarch64:Linux:*:*)
+       GUESS=$UNAME_MACHINE-unknown-linux-$LIBC
+       ;;
     m32r*:Linux:*:*)
-       echo ${UNAME_MACHINE}-unknown-linux-gnu
-       exit ;;
+       GUESS=$UNAME_MACHINE-unknown-linux-$LIBC
+       ;;
     m68*:Linux:*:*)
-       echo ${UNAME_MACHINE}-unknown-linux-gnu
-       exit ;;
-    mips:Linux:*:*)
-       eval $set_cc_for_build
-       sed 's/^        //' << EOF >$dummy.c
+       GUESS=$UNAME_MACHINE-unknown-linux-$LIBC
+       ;;
+    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 $dummy.c 2>/dev/null | sed -n '
-           /^CPU/{
-               s: ::g
-               p
-           }'`"
-       test x"${CPU}" != x && { echo "${CPU}-unknown-linux-gnu"; exit; }
-       ;;
-    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 $dummy.c 2>/dev/null | sed -n '
-           /^CPU/{
-               s: ::g
-               p
-           }'`"
-       test x"${CPU}" != x && { echo "${CPU}-unknown-linux-gnu"; exit; }
-       ;;
-    or32:Linux:*:*)
-       echo or32-unknown-linux-gnu
-       exit ;;
-    ppc:Linux:*:*)
-       echo powerpc-unknown-linux-gnu
-       exit ;;
-    ppc64:Linux:*:*)
-       echo powerpc64-unknown-linux-gnu
-       exit ;;
-    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 ;;
+       cc_set_vars=`$CC_FOR_BUILD -E "$dummy.c" 2>/dev/null | grep '^CPU\|^MIPS_ENDIAN\|^LIBCABI'`
+       eval "$cc_set_vars"
+       test "x$CPU" != x && { echo "$CPU${MIPS_ENDIAN}-unknown-linux-$LIBCABI"; exit; }
+       ;;
+    mips64el:Linux:*:*)
+       GUESS=$UNAME_MACHINE-unknown-linux-$LIBC
+       ;;
+    openrisc*:Linux:*:*)
+       GUESS=or1k-unknown-linux-$LIBC
+       ;;
+    or32:Linux:*:* | or1k*:Linux:*:*)
+       GUESS=$UNAME_MACHINE-unknown-linux-$LIBC
+       ;;
+    padre:Linux:*:*)
+       GUESS=sparc-unknown-linux-$LIBC
+       ;;
+    parisc64:Linux:*:* | hppa64:Linux:*:*)
+       GUESS=hppa64-unknown-linux-$LIBC
+       ;;
     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 ;;
+         PA7*) GUESS=hppa1.1-unknown-linux-$LIBC ;;
+         PA8*) GUESS=hppa2.0-unknown-linux-$LIBC ;;
+         *)    GUESS=hppa-unknown-linux-$LIBC ;;
        esac
-       exit ;;
-    parisc64:Linux:*:* | hppa64:Linux:*:*)
-       echo hppa64-unknown-linux-gnu
-       exit ;;
+       ;;
+    ppc64:Linux:*:*)
+       GUESS=powerpc64-unknown-linux-$LIBC
+       ;;
+    ppc:Linux:*:*)
+       GUESS=powerpc-unknown-linux-$LIBC
+       ;;
+    ppc64le:Linux:*:*)
+       GUESS=powerpc64le-unknown-linux-$LIBC
+       ;;
+    ppcle:Linux:*:*)
+       GUESS=powerpcle-unknown-linux-$LIBC
+       ;;
+    riscv32:Linux:*:* | riscv32be:Linux:*:* | riscv64:Linux:*:* | riscv64be:Linux:*:*)
+       GUESS=$UNAME_MACHINE-unknown-linux-$LIBC
+       ;;
     s390:Linux:*:* | s390x:Linux:*:*)
-       echo ${UNAME_MACHINE}-ibm-linux
-       exit ;;
+       GUESS=$UNAME_MACHINE-ibm-linux-$LIBC
+       ;;
     sh64*:Linux:*:*)
-       echo ${UNAME_MACHINE}-unknown-linux-gnu
-       exit ;;
+       GUESS=$UNAME_MACHINE-unknown-linux-$LIBC
+       ;;
     sh*:Linux:*:*)
-       echo ${UNAME_MACHINE}-unknown-linux-gnu
-       exit ;;
+       GUESS=$UNAME_MACHINE-unknown-linux-$LIBC
+       ;;
     sparc:Linux:*:* | sparc64:Linux:*:*)
-       echo ${UNAME_MACHINE}-unknown-linux-gnu
-       exit ;;
+       GUESS=$UNAME_MACHINE-unknown-linux-$LIBC
+       ;;
+    tile*:Linux:*:*)
+       GUESS=$UNAME_MACHINE-unknown-linux-$LIBC
+       ;;
     vax:Linux:*:*)
-       echo ${UNAME_MACHINE}-dec-linux-gnu
-       exit ;;
+       GUESS=$UNAME_MACHINE-dec-linux-$LIBC
+       ;;
     x86_64:Linux:*:*)
-       echo x86_64-unknown-linux-gnu
-       exit ;;
-    xtensa*:Linux:*:*)
-       echo ${UNAME_MACHINE}-unknown-linux-gnu
-       exit ;;
-    i*86:Linux:*:*)
-       # The BFD linker knows what the default object file format is, so
-       # first see if it will tell us. cd to the root directory to prevent
-       # problems with other programs or directories called `ld' in the path.
-       # Set LC_ALL=C to ensure ld outputs messages in English.
-       ld_supported_targets=`cd /; LC_ALL=C ld --help 2>&1 \
-                        | sed -ne '/supported targets:/!d
-                                   s/[         ][      ]*/ /g
-                                   s/.*supported targets: *//
-                                   s/ .*//
-                                   p'`
-        case "$ld_supported_targets" in
-         elf32-i386)
-               TENTATIVE="${UNAME_MACHINE}-pc-linux-gnu"
-               ;;
-         a.out-i386-linux)
-               echo "${UNAME_MACHINE}-pc-linux-gnuaout"
-               exit ;;
-         "")
-               # 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 ;;
-       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
-       #if defined(__INTEL_COMPILER) || defined(__PGI) || defined(__SUNPRO_C) || defined(__SUNPRO_CC)
-       LIBC=gnu
-       #else
-       LIBC=gnuaout
-       #endif
-       #endif
-       #ifdef __dietlibc__
-       LIBC=dietlibc
-       #endif
+       set_cc_for_build
+       CPU=$UNAME_MACHINE
+       LIBCABI=$LIBC
+       if test "$CC_FOR_BUILD" != no_compiler_found; then
+           ABI=64
+           sed 's/^        //' << EOF > "$dummy.c"
+           #ifdef __i386__
+           ABI=x86
+           #else
+           #ifdef __ILP32__
+           ABI=x32
+           #endif
+           #endif
 EOF
-       eval "`$CC_FOR_BUILD -E $dummy.c 2>/dev/null | sed -n '
-           /^LIBC/{
-               s: ::g
-               p
-           }'`"
-       test x"${LIBC}" != x && {
-               echo "${UNAME_MACHINE}-pc-linux-${LIBC}"
-               exit
-       }
-       test x"${TENTATIVE}" != x && { echo "${TENTATIVE}"; exit; }
+           cc_set_abi=`$CC_FOR_BUILD -E "$dummy.c" 2>/dev/null | grep '^ABI' | sed 's, ,,g'`
+           eval "$cc_set_abi"
+           case $ABI in
+               x86) CPU=i686 ;;
+               x32) LIBCABI=${LIBC}x32 ;;
+           esac
+       fi
+       GUESS=$CPU-pc-linux-$LIBCABI
+       ;;
+    xtensa*:Linux:*:*)
+       GUESS=$UNAME_MACHINE-unknown-linux-$LIBC
        ;;
     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 ;;
+       GUESS=i386-sequent-sysv4
+       ;;
     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 ;;
+       # Use sysv4.2uw... so that sysv4* matches it.
+       GUESS=$UNAME_MACHINE-pc-sysv4.2uw$UNAME_VERSION
+       ;;
     i*86:OS/2:*:*)
        # If we were able to find `uname', then EMX Unix compatibility
        # is probably installed.
-       echo ${UNAME_MACHINE}-pc-os2-emx
-       exit ;;
+       GUESS=$UNAME_MACHINE-pc-os2-emx
+       ;;
     i*86:XTS-300:*:STOP)
-       echo ${UNAME_MACHINE}-unknown-stop
-       exit ;;
+       GUESS=$UNAME_MACHINE-unknown-stop
+       ;;
     i*86:atheos:*:*)
-       echo ${UNAME_MACHINE}-unknown-atheos
-       exit ;;
+       GUESS=$UNAME_MACHINE-unknown-atheos
+       ;;
     i*86:syllable:*:*)
-       echo ${UNAME_MACHINE}-pc-syllable
-       exit ;;
-    i*86:LynxOS:2.*:* | i*86:LynxOS:3.[01]*:* | i*86:LynxOS:4.0*:*)
-       echo i386-unknown-lynxos${UNAME_RELEASE}
-       exit ;;
+       GUESS=$UNAME_MACHINE-pc-syllable
+       ;;
+    i*86:LynxOS:2.*:* | i*86:LynxOS:3.[01]*:* | i*86:LynxOS:4.[02]*:*)
+       GUESS=i386-unknown-lynxos$UNAME_RELEASE
+       ;;
     i*86:*DOS:*:*)
-       echo ${UNAME_MACHINE}-pc-msdosdjgpp
-       exit ;;
-    i*86:*:4.*:* | i*86:SYSTEM_V:4.*:*)
-       UNAME_REL=`echo ${UNAME_RELEASE} | sed 's/\/MP$//'`
+       GUESS=$UNAME_MACHINE-pc-msdosdjgpp
+       ;;
+    i*86:*:4.*:*)
+       UNAME_REL=`echo "$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}
+               GUESS=$UNAME_MACHINE-univel-sysv$UNAME_REL
        else
-               echo ${UNAME_MACHINE}-pc-sysv${UNAME_REL}
+               GUESS=$UNAME_MACHINE-pc-sysv$UNAME_REL
        fi
-       exit ;;
+       ;;
     i*86:*:5:[678]*)
-       # UnixWare 7.x, OpenUNIX and OpenServer 6.
+       # 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 ;;
+       GUESS=$UNAME_MACHINE-unknown-sysv${UNAME_RELEASE}${UNAME_SYSTEM}${UNAME_VERSION}
+       ;;
     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
+               GUESS=$UNAME_MACHINE-pc-isc$UNAME_REL
        elif /bin/uname -X 2>/dev/null >/dev/null ; then
                UNAME_REL=`(/bin/uname -X|grep Release|sed -e 's/.*= //')`
                (/bin/uname -X|grep i80486 >/dev/null) && UNAME_MACHINE=i486
@@ -1091,40 +1240,43 @@ EOF
                        && UNAME_MACHINE=i686
                (/bin/uname -X|grep '^Machine.*Pentium Pro' >/dev/null) \
                        && UNAME_MACHINE=i686
-               echo ${UNAME_MACHINE}-pc-sco$UNAME_REL
+               GUESS=$UNAME_MACHINE-pc-sco$UNAME_REL
        else
-               echo ${UNAME_MACHINE}-pc-sysv32
+               GUESS=$UNAME_MACHINE-pc-sysv32
        fi
-       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 ;;
+       # 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.
+       GUESS=i586-pc-msdosdjgpp
+       ;;
     Intel:Mach:3*:*)
-       echo i386-pc-mach3
-       exit ;;
+       GUESS=i386-pc-mach3
+       ;;
     paragon:*:*:*)
-       echo i860-intel-osf1
-       exit ;;
+       GUESS=i860-intel-osf1
+       ;;
     i860:*:4.*:*) # i860-SVR4
        if grep Stardent /usr/include/sys/uadmin.h >/dev/null 2>&1 ; then
-         echo i860-stardent-sysv${UNAME_RELEASE} # Stardent Vistra i860-SVR4
+         GUESS=i860-stardent-sysv$UNAME_RELEASE    # Stardent Vistra i860-SVR4
        else # Add other i860-SVR4 vendors below as they are discovered.
-         echo i860-unknown-sysv${UNAME_RELEASE}  # Unknown i860-SVR4
+         GUESS=i860-unknown-sysv$UNAME_RELEASE     # Unknown i860-SVR4
        fi
-       exit ;;
+       ;;
     mini*:CTIX:SYS*5:*)
        # "miniframe"
-       echo m68010-convergent-sysv
-       exit ;;
+       GUESS=m68010-convergent-sysv
+       ;;
     mc68k:UNIX:SYSTEM5:3.51m)
-       echo m68k-convergent-sysv
-       exit ;;
+       GUESS=m68k-convergent-sysv
+       ;;
     M680?0:D-NIX:5.3:*)
-       echo m68k-diab-dnix
-       exit ;;
+       GUESS=m68k-diab-dnix
+       ;;
     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)
@@ -1132,208 +1284,298 @@ EOF
        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${OS_REL}; exit; }
+         && { echo i486-ncr-sysv4.3"$OS_REL"; exit; }
        /bin/uname -p 2>/dev/null | /bin/grep entium >/dev/null \
-         && { echo i586-ncr-sysv4.3${OS_REL}; exit; } ;;
+         && { echo i586-ncr-sysv4.3"$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; } ;;
+       /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 ;;
+       GUESS=m68k-unknown-lynxos$UNAME_RELEASE
+       ;;
     mc68030:UNIX_System_V:4.*:*)
-       echo m68k-atari-sysv4
-       exit ;;
+       GUESS=m68k-atari-sysv4
+       ;;
     TSUNAMI:LynxOS:2.*:*)
-       echo sparc-unknown-lynxos${UNAME_RELEASE}
-       exit ;;
+       GUESS=sparc-unknown-lynxos$UNAME_RELEASE
+       ;;
     rs6000:LynxOS:2.*:*)
-       echo rs6000-unknown-lynxos${UNAME_RELEASE}
-       exit ;;
-    PowerPC:LynxOS:2.*:* | PowerPC:LynxOS:3.[01]*:* | PowerPC:LynxOS:4.0*:*)
-       echo powerpc-unknown-lynxos${UNAME_RELEASE}
-       exit ;;
+       GUESS=rs6000-unknown-lynxos$UNAME_RELEASE
+       ;;
+    PowerPC:LynxOS:2.*:* | PowerPC:LynxOS:3.[01]*:* | PowerPC:LynxOS:4.[02]*:*)
+       GUESS=powerpc-unknown-lynxos$UNAME_RELEASE
+       ;;
     SM[BE]S:UNIX_SV:*:*)
-       echo mips-dde-sysv${UNAME_RELEASE}
-       exit ;;
+       GUESS=mips-dde-sysv$UNAME_RELEASE
+       ;;
     RM*:ReliantUNIX-*:*:*)
-       echo mips-sni-sysv4
-       exit ;;
+       GUESS=mips-sni-sysv4
+       ;;
     RM*:SINIX-*:*:*)
-       echo mips-sni-sysv4
-       exit ;;
+       GUESS=mips-sni-sysv4
+       ;;
     *:SINIX-*:*:*)
        if uname -p 2>/dev/null >/dev/null ; then
                UNAME_MACHINE=`(uname -p) 2>/dev/null`
-               echo ${UNAME_MACHINE}-sni-sysv4
+               GUESS=$UNAME_MACHINE-sni-sysv4
        else
-               echo ns32k-sni-sysv
+               GUESS=ns32k-sni-sysv
        fi
-       exit ;;
-    PENTIUM:*:4.0*:*) # Unisys `ClearPath HMP IX 4000' SVR4/MP effort
-                      # says <Richard.M.Bartel@ccMail.Census.GOV>
-        echo i586-unisys-sysv4
-        exit ;;
+       ;;
+    PENTIUM:*:4.0*:*)  # Unisys `ClearPath HMP IX 4000' SVR4/MP effort
+                       # says <Richard.M.Bartel@ccMail.Census.GOV>
+       GUESS=i586-unisys-sysv4
+       ;;
     *:UNIX_System_V:4*:FTX*)
        # From Gerald Hewes <hewes@openmarket.com>.
        # How about differentiating between stratus architectures? -djm
-       echo hppa1.1-stratus-sysv4
-       exit ;;
+       GUESS=hppa1.1-stratus-sysv4
+       ;;
     *:*:*:FTX*)
        # From seanf@swdc.stratus.com.
-       echo i860-stratus-sysv4
-       exit ;;
+       GUESS=i860-stratus-sysv4
+       ;;
     i*86:VOS:*:*)
        # From Paul.Green@stratus.com.
-       echo ${UNAME_MACHINE}-stratus-vos
-       exit ;;
+       GUESS=$UNAME_MACHINE-stratus-vos
+       ;;
     *:VOS:*:*)
        # From Paul.Green@stratus.com.
-       echo hppa1.1-stratus-vos
-       exit ;;
+       GUESS=hppa1.1-stratus-vos
+       ;;
     mc68*:A/UX:*:*)
-       echo m68k-apple-aux${UNAME_RELEASE}
-       exit ;;
+       GUESS=m68k-apple-aux$UNAME_RELEASE
+       ;;
     news*:NEWS-OS:6*:*)
-       echo mips-sony-newsos6
-       exit ;;
+       GUESS=mips-sony-newsos6
+       ;;
     R[34]000:*System_V*:*:* | R4000:UNIX_SYSV:*:* | R*000:UNIX_SV:*:*)
-       if [ -d /usr/nec ]; then
-               echo mips-nec-sysv${UNAME_RELEASE}
+       if test -d /usr/nec; then
+               GUESS=mips-nec-sysv$UNAME_RELEASE
        else
-               echo mips-unknown-sysv${UNAME_RELEASE}
+               GUESS=mips-unknown-sysv$UNAME_RELEASE
        fi
-        exit ;;
+       ;;
     BeBox:BeOS:*:*)    # BeOS running on hardware made by Be, PPC only.
-       echo powerpc-be-beos
-       exit ;;
+       GUESS=powerpc-be-beos
+       ;;
     BeMac:BeOS:*:*)    # BeOS running on Mac or Mac clone, PPC only.
-       echo powerpc-apple-beos
-       exit ;;
+       GUESS=powerpc-apple-beos
+       ;;
     BePC:BeOS:*:*)     # BeOS running on Intel PC compatible.
-       echo i586-pc-beos
-       exit ;;
+       GUESS=i586-pc-beos
+       ;;
     BePC:Haiku:*:*)    # Haiku running on Intel PC compatible.
-       echo i586-pc-haiku
-       exit ;;
+       GUESS=i586-pc-haiku
+       ;;
+    ppc:Haiku:*:*)     # Haiku running on Apple PowerPC
+       GUESS=powerpc-apple-haiku
+       ;;
+    *:Haiku:*:*)       # Haiku modern gcc (not bound by BeOS compat)
+       GUESS=$UNAME_MACHINE-unknown-haiku
+       ;;
     SX-4:SUPER-UX:*:*)
-       echo sx4-nec-superux${UNAME_RELEASE}
-       exit ;;
+       GUESS=sx4-nec-superux$UNAME_RELEASE
+       ;;
     SX-5:SUPER-UX:*:*)
-       echo sx5-nec-superux${UNAME_RELEASE}
-       exit ;;
+       GUESS=sx5-nec-superux$UNAME_RELEASE
+       ;;
     SX-6:SUPER-UX:*:*)
-       echo sx6-nec-superux${UNAME_RELEASE}
-       exit ;;
+       GUESS=sx6-nec-superux$UNAME_RELEASE
+       ;;
     SX-7:SUPER-UX:*:*)
-       echo sx7-nec-superux${UNAME_RELEASE}
-       exit ;;
+       GUESS=sx7-nec-superux$UNAME_RELEASE
+       ;;
     SX-8:SUPER-UX:*:*)
-       echo sx8-nec-superux${UNAME_RELEASE}
-       exit ;;
+       GUESS=sx8-nec-superux$UNAME_RELEASE
+       ;;
     SX-8R:SUPER-UX:*:*)
-       echo sx8r-nec-superux${UNAME_RELEASE}
-       exit ;;
+       GUESS=sx8r-nec-superux$UNAME_RELEASE
+       ;;
+    SX-ACE:SUPER-UX:*:*)
+       GUESS=sxace-nec-superux$UNAME_RELEASE
+       ;;
     Power*:Rhapsody:*:*)
-       echo powerpc-apple-rhapsody${UNAME_RELEASE}
-       exit ;;
+       GUESS=powerpc-apple-rhapsody$UNAME_RELEASE
+       ;;
     *:Rhapsody:*:*)
-       echo ${UNAME_MACHINE}-apple-rhapsody${UNAME_RELEASE}
-       exit ;;
+       GUESS=$UNAME_MACHINE-apple-rhapsody$UNAME_RELEASE
+       ;;
+    arm64:Darwin:*:*)
+       GUESS=aarch64-apple-darwin$UNAME_RELEASE
+       ;;
     *:Darwin:*:*)
-       UNAME_PROCESSOR=`uname -p` || UNAME_PROCESSOR=unknown
+       UNAME_PROCESSOR=`uname -p`
        case $UNAME_PROCESSOR in
            unknown) UNAME_PROCESSOR=powerpc ;;
        esac
-       echo ${UNAME_PROCESSOR}-apple-darwin${UNAME_RELEASE}
-       exit ;;
+       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=$UNAME_MACHINE
+       fi
+       GUESS=$UNAME_PROCESSOR-apple-darwin$UNAME_RELEASE
+       ;;
     *:procnto*:*:* | *:QNX:[0123456789]*:*)
        UNAME_PROCESSOR=`uname -p`
-       if test "$UNAME_PROCESSOR" = "x86"; then
+       if test "$UNAME_PROCESSOR" = x86; then
                UNAME_PROCESSOR=i386
                UNAME_MACHINE=pc
        fi
-       echo ${UNAME_PROCESSOR}-${UNAME_MACHINE}-nto-qnx${UNAME_RELEASE}
-       exit ;;
+       GUESS=$UNAME_PROCESSOR-$UNAME_MACHINE-nto-qnx$UNAME_RELEASE
+       ;;
     *:QNX:*:4*)
-       echo i386-pc-qnx
-       exit ;;
-    NSE-?:NONSTOP_KERNEL:*:*)
-       echo nse-tandem-nsk${UNAME_RELEASE}
-       exit ;;
-    NSR-?:NONSTOP_KERNEL:*:*)
-       echo nsr-tandem-nsk${UNAME_RELEASE}
-       exit ;;
+       GUESS=i386-pc-qnx
+       ;;
+    NEO-*:NONSTOP_KERNEL:*:*)
+       GUESS=neo-tandem-nsk$UNAME_RELEASE
+       ;;
+    NSE-*:NONSTOP_KERNEL:*:*)
+       GUESS=nse-tandem-nsk$UNAME_RELEASE
+       ;;
+    NSR-*:NONSTOP_KERNEL:*:*)
+       GUESS=nsr-tandem-nsk$UNAME_RELEASE
+       ;;
+    NSV-*:NONSTOP_KERNEL:*:*)
+       GUESS=nsv-tandem-nsk$UNAME_RELEASE
+       ;;
+    NSX-*:NONSTOP_KERNEL:*:*)
+       GUESS=nsx-tandem-nsk$UNAME_RELEASE
+       ;;
     *:NonStop-UX:*:*)
-       echo mips-compaq-nonstopux
-       exit ;;
+       GUESS=mips-compaq-nonstopux
+       ;;
     BS2000:POSIX*:*:*)
-       echo bs2000-siemens-sysv
-       exit ;;
+       GUESS=bs2000-siemens-sysv
+       ;;
     DS/*:UNIX_System_V:*:*)
-       echo ${UNAME_MACHINE}-${UNAME_SYSTEM}-${UNAME_RELEASE}
-       exit ;;
+       GUESS=$UNAME_MACHINE-$UNAME_SYSTEM-$UNAME_RELEASE
+       ;;
     *: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
+       if test "${cputype-}" = 386; then
            UNAME_MACHINE=i386
-       else
-           UNAME_MACHINE="$cputype"
+       elif test "x${cputype-}" != x; then
+           UNAME_MACHINE=$cputype
        fi
-       echo ${UNAME_MACHINE}-unknown-plan9
-       exit ;;
+       GUESS=$UNAME_MACHINE-unknown-plan9
+       ;;
     *:TOPS-10:*:*)
-       echo pdp10-unknown-tops10
-       exit ;;
+       GUESS=pdp10-unknown-tops10
+       ;;
     *:TENEX:*:*)
-       echo pdp10-unknown-tenex
-       exit ;;
+       GUESS=pdp10-unknown-tenex
+       ;;
     KS10:TOPS-20:*:* | KL10:TOPS-20:*:* | TYPE4:TOPS-20:*:*)
-       echo pdp10-dec-tops20
-       exit ;;
+       GUESS=pdp10-dec-tops20
+       ;;
     XKL-1:TOPS-20:*:* | TYPE5:TOPS-20:*:*)
-       echo pdp10-xkl-tops20
-       exit ;;
+       GUESS=pdp10-xkl-tops20
+       ;;
     *:TOPS-20:*:*)
-       echo pdp10-unknown-tops20
-       exit ;;
+       GUESS=pdp10-unknown-tops20
+       ;;
     *:ITS:*:*)
-       echo pdp10-unknown-its
-       exit ;;
+       GUESS=pdp10-unknown-its
+       ;;
     SEI:*:*:SEIUX)
-        echo mips-sei-seiux${UNAME_RELEASE}
-       exit ;;
+       GUESS=mips-sei-seiux$UNAME_RELEASE
+       ;;
     *:DragonFly:*:*)
-       echo ${UNAME_MACHINE}-unknown-dragonfly`echo ${UNAME_RELEASE}|sed -e 's/[-(].*//'`
-       exit ;;
+       DRAGONFLY_REL=`echo "$UNAME_RELEASE" | sed -e 's/[-(].*//'`
+       GUESS=$UNAME_MACHINE-unknown-dragonfly$DRAGONFLY_REL
+       ;;
     *:*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 ;;
+       UNAME_MACHINE=`(uname -p) 2>/dev/null`
+       case $UNAME_MACHINE in
+           A*) GUESS=alpha-dec-vms ;;
+           I*) GUESS=ia64-dec-vms ;;
+           V*) GUESS=vax-dec-vms ;;
        esac ;;
     *:XENIX:*:SysV)
-       echo i386-pc-xenix
-       exit ;;
+       GUESS=i386-pc-xenix
+       ;;
     i*86:skyos:*:*)
-       echo ${UNAME_MACHINE}-pc-skyos`echo ${UNAME_RELEASE}` | sed -e 's/ .*$//'
-       exit ;;
+       SKYOS_REL=`echo "$UNAME_RELEASE" | sed -e 's/ .*$//'`
+       GUESS=$UNAME_MACHINE-pc-skyos$SKYOS_REL
+       ;;
     i*86:rdos:*:*)
-       echo ${UNAME_MACHINE}-pc-rdos
-       exit ;;
+       GUESS=$UNAME_MACHINE-pc-rdos
+       ;;
+    i*86:Fiwix:*:*)
+       GUESS=$UNAME_MACHINE-pc-fiwix
+       ;;
+    *:AROS:*:*)
+       GUESS=$UNAME_MACHINE-unknown-aros
+       ;;
+    x86_64:VMkernel:*:*)
+       GUESS=$UNAME_MACHINE-unknown-esx
+       ;;
+    amd64:Isilon\ OneFS:*:*)
+       GUESS=x86_64-unknown-onefs
+       ;;
+    *:Unleashed:*:*)
+       GUESS=$UNAME_MACHINE-unknown-unleashed$UNAME_RELEASE
+       ;;
 esac
 
-#echo '(No uname command or uname output not recognized.)' 1>&2
-#echo "${UNAME_MACHINE}:${UNAME_SYSTEM}:${UNAME_RELEASE}:${UNAME_VERSION}" 1>&2
+# Do we have a guess based on uname results?
+if test "x$GUESS" != x; then
+    echo "$GUESS"
+    exit
+fi
 
-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 ()
 {
@@ -1346,20 +1588,12 @@ main ()
 #include <sys/param.h>
   printf ("m68k-sony-newsos%s\n",
 #ifdef NEWSOS4
-          "4"
+  "4"
 #else
-         ""
-#endif
-         ); exit (0);
+  ""
 #endif
+  ); exit (0);
 #endif
-
-#if defined (__arm) && defined (__acorn) && defined (__unix)
-  printf ("arm-acorn-riscix\n"); exit (0);
-#endif
-
-#if defined (hp300) && !defined (hpux)
-  printf ("m68k-hp-bsd\n"); exit (0);
 #endif
 
 #if defined (NeXT)
@@ -1401,39 +1635,54 @@ 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)
@@ -1444,54 +1693,46 @@ main ()
 }
 EOF
 
-$CC_FOR_BUILD -o $dummy $dummy.c 2>/dev/null && SYSTEM_NAME=`$dummy` &&
+$CC_FOR_BUILD -o "$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; }
+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 ;;
-    c2*)
-       if getsysinfo -f scalar_acc
-       then echo c32-convex-bsd
-       else echo c2-convex-bsd
-       fi
-       exit ;;
-    c34*)
-       echo c34-convex-bsd
-       exit ;;
-    c38*)
-       echo c38-convex-bsd
-       exit ;;
-    c4*)
-       echo c4-convex-bsd
-       exit ;;
-    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:
 
-  http://git.savannah.gnu.org/gitweb/?p=config.git;a=blob_plain;f=config.guess;hb=HEAD
+  https://git.savannah.gnu.org/cgit/config.git/plain/config.guess
 and
-  http://git.savannah.gnu.org/gitweb/?p=config.git;a=blob_plain;f=config.sub;hb=HEAD
+  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 <config-patches@gnu.org> in order to provide the needed
-information to handle your system.
+our_year=`echo $timestamp | sed 's,-.*,,'`
+thisyear=`date +%Y`
+# shellcheck disable=SC2003
+script_age=`expr "$thisyear" - "$our_year"`
+if test "$script_age" -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 config-patches@gnu.org to
+provide the necessary information to handle your system.
 
 config.guess timestamp = $timestamp
 
@@ -1510,16 +1751,17 @@ hostinfo               = `(hostinfo) 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: "'"