llvm/cmake/config.guess: update to current version

[hvdijk]

Summary

This copies current upstream config.guess to llvm/cmake/config.guess, to pick up upstream's detection for x86_64-pc-linux-gnux32. The previous version of config.guess had various changes applied; all of these changes are part of the upstream version.

@MaskRay: I am adding you as a reviewer as there is no specific owner mentioned in CODE_OWNERS.TXT, but you reviewed a recent change that applied one of those manual modifications to config.guess (D93918). Do you remember whether there was a particular reason not to just take the upstream version?

[MaskRay]

Seems reasonable. Hope @Bdragon28 can confirm powerpcle-unknown-linux-gnu still works.

[Bdragon28]

I'm pretty sure we're using this old config.guess on purpose to avoid GPL3 code.

llvm/cmake/config.guess

9

Err, the reason we're on this old version is specifically to prevent GPL3 code from being in tree, I thought.

[MaskRay]

Interesting, did not know the difference. There are other GPL 3 config.guess in llvm-project. But license issues should ... always be taken prudently, so may deserve a discussion on llvm-dev.

% rg 'Free Software Foundation; either version 3 of'
polly/lib/External/isl/config.sub
9:# the Free Software Foundation; either version 3 of the License, or

polly/lib/External/isl/config.guess
9:# the Free Software Foundation; either version 3 of the License, or

polly/lib/External/isl/ltmain.sh
78:# the Free Software Foundation; either version 3 of the License, or

polly/lib/External/isl/interface/config.guess
9:# the Free Software Foundation; either version 3 of the License, or

polly/lib/External/isl/interface/config.sub
9:# the Free Software Foundation; either version 3 of the License, or

polly/lib/External/isl/interface/ltmain.sh
78:# the Free Software Foundation; either version 3 of the License, or

polly/lib/External/isl/m4/ax_create_pkgconfig_info.m4
37:#   Free Software Foundation; either version 3 of the License, or (at your

[Bdragon28]

llvm/cmake/config.guess

25

And since we don't use Autoconf with this copy of the file, this exemption doesn't apply, so yeah, I'm pretty sure this change isn't allowed in tree.

[Bdragon28]

Yeah, I think the only reason the isl code can get away with it is that it's related to the usage of Autoconf in that directory. llvm/cmake/config.guess doesn't have that exemption because it's being invoked from a cmake module, not an Autoconf script.

[hvdijk]

If that were the reason, why are we not using the last GPLv2 version of config.guess, rather than the one that we happened to use back when we had an autoconf build system?

We never link to config.guess or otherwise include its code into LLVM, we only read its output. The GPL, whether v2 or v3, places no restrictions on how that output is used. But agreed that it is good to be cautious, so will ask on the list.

[Meinersbur]

In D99625#2660408, @MaskRay wrote:

Interesting, did not know the difference. There are other GPL 3 config.guess in llvm-project. But license issues should ... always be taken prudently, so may deserve a discussion on llvm-dev.

% rg 'Free Software Foundation; either version 3 of'
polly/lib/External/isl/config.sub
9:# the Free Software Foundation; either version 3 of the License, or

polly/lib/External/isl/config.guess
9:# the Free Software Foundation; either version 3 of the License, or

polly/lib/External/isl/ltmain.sh
78:# the Free Software Foundation; either version 3 of the License, or

polly/lib/External/isl/interface/config.guess
9:# the Free Software Foundation; either version 3 of the License, or

polly/lib/External/isl/interface/config.sub
9:# the Free Software Foundation; either version 3 of the License, or

polly/lib/External/isl/interface/ltmain.sh
78:# the Free Software Foundation; either version 3 of the License, or

polly/lib/External/isl/m4/ax_create_pkgconfig_info.m4
37:#   Free Software Foundation; either version 3 of the License, or (at your

These come from external projects that are autotools-configured in their distribution package (but not in their source repository, with the exception of ax_create_pkgconfig_info.m4). In my understanding it is ok for non-GPL 3 software to use autotools and distribute the output of make dist in the original license.

It might be theoretically possibly to instead use GPLv2-licensed old version of autotools instead of a GPLv3-licensed one, if one can get one installed in parallel on a modern GNU/Linux distribution. However, in the LLVM-tree, we use CMake to build it, so none of the files above are actually needed, and I we could remove them if they pose a problem.

llvm/cmake/config.guess

 #! /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, 2009, 2010,
-#   2011 Free Software Foundation, Inc.
+#   Copyright 1992-2021 Free Software Foundation, Inc.
 
-timestamp='2011-08-20'
+timestamp='2021-01-25'
 
 # 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
 # WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 # 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.  Please send patches (context
-# diff format) to <[e-mail]> and include a 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").
 #
-# 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.
+# Originally written by Per Bothner; maintained since 2000 by Ben Elliston.
 #
 # You can get the latest version of this script 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
+#
+# Please send patches to <[e-mail]>.
 
-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
 
 Report bugs and patches to <[e-mail]>."
 
 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, 2009, 2010, 2011 Free
-Software Foundation, Inc.
+Copyright 1992-2021 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."
 
 help="
 Try \`$me --help' for more information."
 
 # Parse command line
while test $# -gt 0 ; do
   esac
 done
 
 if test $# != 0; then
   echo "$me: too many arguments$help" >&2
   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
 # headache to deal with in a portable fashion.
 
 # Historically, `CC_FOR_BUILD' used to be named `HOST_CC'. We still
 # use `HOST_CC' if defined, but it is deprecated.
 
 # 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
+    : "${TMPDIR=/tmp}"
+    # shellcheck disable=SC2039
+    { tmp=$( (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.
 # ([e-mail] 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
   # compatibility and a consistent mechanism for selecting the
   # object file format.
   #
   # 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__ | $CC_FOR_BUILD -E - 2>/dev/null \
       | grep -q __ELF__
     then
         # Once all utilities can be ECOFF (netbsdecoff) or a.out (netbsdaout).
         # Return netbsd for either.  FIX?
         os=netbsd
     else
         os=netbsdelf
     fi
     ;;
       *)
     os=netbsd
     ;;
   esac
+  # Determine ABI tags.
+  case "$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
   # Debian GNU/NetBSD machines have a different userland, and
   # 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}"
+  echo "$machine-${os}${release}${abi-}"
+  exit ;;
+    *:Bitrig:*:*)
+  UNAME_MACHINE_ARCH=$(arch | sed 's/Bitrig.//')
+  echo "$UNAME_MACHINE_ARCH"-unknown-bitrig"$UNAME_RELEASE"
   exit ;;
     *:OpenBSD:*:*)
-  UNAME_MACHINE_ARCH=`arch | sed 's/OpenBSD.//'`
-  echo ${UNAME_MACHINE_ARCH}-unknown-openbsd${UNAME_RELEASE}
+  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}
+  echo "$UNAME_MACHINE"-unknown-ekkobsd"$UNAME_RELEASE"
   exit ;;
     *:SolidBSD:*:*)
-  echo ${UNAME_MACHINE}-unknown-solidbsd${UNAME_RELEASE}
+  echo "$UNAME_MACHINE"-unknown-solidbsd"$UNAME_RELEASE"
+  exit ;;
+    *:OS108:*:*)
+  echo "$UNAME_MACHINE"-unknown-os108_"$UNAME_RELEASE"
   exit ;;
     macppc:MirBSD:*:*)
-  echo powerpc-unknown-mirbsd${UNAME_RELEASE}
+  echo powerpc-unknown-mirbsd"$UNAME_RELEASE"
   exit ;;
     *:MirBSD:*:*)
-  echo ${UNAME_MACHINE}-unknown-mirbsd${UNAME_RELEASE}
+  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:*:*)
   case $UNAME_RELEASE in
   *4.0)
-    UNAME_RELEASE=`/usr/sbin/sizer -v | awk '{print $3}'`
+    UNAME_RELEASE=$(/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
   # 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 ${UNAME_RELEASE} | sed -e 's/^[PVTX]//' | tr 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' 'abcdefghijklmnopqrstuvwxyz'`
+  echo "$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 ;;
-    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 ;;
     Amiga*:UNIX_System_V:4.0:*)
   echo m68k-unknown-sysv4
   exit ;;
     *:[Aa]miga[Oo][Ss]:*:*)
-  echo ${UNAME_MACHINE}-unknown-amigaos
+  echo "$UNAME_MACHINE"-unknown-amigaos
   exit ;;
     *:[Mm]orph[Oo][Ss]:*:*)
-  echo ${UNAME_MACHINE}-unknown-morphos
+  echo "$UNAME_MACHINE"-unknown-morphos
   exit ;;
     *:OS/390:*:*)
   echo i370-ibm-openedition
   exit ;;
     *:z/VM:*:*)
   echo s390-ibm-zvmoe
   exit ;;
     *:OS400:*:*)
   echo powerpc-ibm-os400
   exit ;;
     arm:RISC*:1.[012]*:*|arm:riscix:1.[012]*:*)
-  echo arm-acorn-riscix${UNAME_RELEASE}
+  echo arm-acorn-riscix"$UNAME_RELEASE"
   exit ;;
-    arm:riscos:*:*|arm:RISCOS:*:*)
+    arm*:riscos:*:*|arm*:RISCOS:*:*)
   echo arm-unknown-riscos
   exit ;;
     SR2?01:HI-UX/MPP:*:* | SR8000:HI-UX/MPP:*:*)
   echo hppa1.1-hitachi-hiuxmpp
   exit ;;
     Pyramid*:OSx*:*:* | MIS*:OSx*:*:* | MIS*:SMP_DC-OSx*:*:*)
   # [e-mail] (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 ;;
     NILE*:*:*:dcosx)
   echo pyramid-pyramid-svr4
   exit ;;
     DRS?6000:unix:4.0:6*)
   echo sparc-icl-nx6
   exit ;;
     DRS?6000:UNIX_SV:4.2*:7* | DRS?6000:isis:4.2*:7*)
-  case `/usr/bin/uname -p` in
+  case $(/usr/bin/uname -p) in
       sparc) echo sparc-icl-nx7; exit ;;
   esac ;;
     s390x:SunOS:*:*)
-  echo ${UNAME_MACHINE}-ibm-solaris2`echo ${UNAME_RELEASE}|sed -e 's/[^.]*//'`
+  echo "$UNAME_MACHINE"-ibm-solaris2"$(echo "$UNAME_RELEASE" | sed -e 's/[^.]*//')"
   exit ;;
     sun4H:SunOS:5.*:*)
-  echo sparc-hal-solaris2`echo ${UNAME_RELEASE}|sed -e 's/[^.]*//'`
+  echo sparc-hal-solaris2"$(echo "$UNAME_RELEASE"|sed -e 's/[^.]*//')"
   exit ;;
     sun4*:SunOS:5.*:* | tadpole*:SunOS:5.*:*)
-  echo sparc-sun-solaris2`echo ${UNAME_RELEASE}|sed -e 's/[^.]*//'`
+  echo sparc-sun-solaris2"$(echo "$UNAME_RELEASE" | sed -e 's/[^.]*//')"
   exit ;;
     i86pc:AuroraUX:5.*:* | i86xen:AuroraUX:5.*:*)
-  echo i386-pc-auroraux${UNAME_RELEASE}
+  echo i386-pc-auroraux"$UNAME_RELEASE"
   exit ;;
     i86pc:SunOS:5.*:* | i86xen:SunOS:5.*:*)
-  eval $set_cc_for_build
-  SUN_ARCH="i386"
+  set_cc_for_build
+  SUN_ARCH=i386
   # If there is a compiler, see if it is configured for 64-bit objects.
   # Note that the Sun cc does not turn __LP64__ into 1 like gcc does.
   # This test works for both compilers.
-  if [ "$CC_FOR_BUILD" != 'no_compiler_found' ]; then
+  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) | \
+    (CCOPTS="" $CC_FOR_BUILD -E - 2>/dev/null) | \
     grep IS_64BIT_ARCH >/dev/null
       then
-    SUN_ARCH="x86_64"
+    SUN_ARCH=x86_64
       fi
   fi
-  echo ${SUN_ARCH}-pc-solaris2`echo ${UNAME_RELEASE}|sed -e 's/[^.]*//'`
+  echo "$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 ${UNAME_RELEASE}|sed -e 's/[^.]*//'`
+  echo sparc-sun-solaris3"$(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 ${UNAME_RELEASE}|sed -e 's/-/_/'`
+  echo sparc-sun-sunos"$(echo "$UNAME_RELEASE"|sed -e 's/-/_/')"
   exit ;;
     sun3*:SunOS:*:*)
-  echo m68k-sun-sunos${UNAME_RELEASE}
+  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"$UNAME_RELEASE"
     ;;
   esac
   exit ;;
     aushp:SunOS:*:*)
-  echo sparc-auspex-sunos${UNAME_RELEASE}
+  echo sparc-auspex-sunos"$UNAME_RELEASE"
   exit ;;
     # The situation for MiNT is a little confusing.  The machine name
     # can be virtually everything (everything which is not
     # "atarist" or "atariste" at least should have a processor
     # > m68000).  The system name ranges from "MiNT" over "FreeMiNT"
     # to the lowercase version "mint" (or "freemint").  Finally
     # the system name "TOS" denotes a system which is actually not
     # MiNT.  But MiNT is downward compatible to TOS, so this should
     # be no problem.
     atarist[e]:*MiNT:*:* | atarist[e]:*mint:*:* | atarist[e]:*TOS:*:*)
-  echo m68k-atari-mint${UNAME_RELEASE}
+  echo m68k-atari-mint"$UNAME_RELEASE"
   exit ;;
     atari*:*MiNT:*:* | atari*:*mint:*:* | atarist[e]:*TOS:*:*)
-  echo m68k-atari-mint${UNAME_RELEASE}
+  echo m68k-atari-mint"$UNAME_RELEASE"
   exit ;;
     *falcon*:*MiNT:*:* | *falcon*:*mint:*:* | *falcon*:*TOS:*:*)
-  echo m68k-atari-mint${UNAME_RELEASE}
+  echo m68k-atari-mint"$UNAME_RELEASE"
   exit ;;
     milan*:*MiNT:*:* | milan*:*mint:*:* | *milan*:*TOS:*:*)
-  echo m68k-milan-mint${UNAME_RELEASE}
+  echo m68k-milan-mint"$UNAME_RELEASE"
   exit ;;
     hades*:*MiNT:*:* | hades*:*mint:*:* | *hades*:*TOS:*:*)
-  echo m68k-hades-mint${UNAME_RELEASE}
+  echo m68k-hades-mint"$UNAME_RELEASE"
   exit ;;
     *:*MiNT:*:* | *:*mint:*:* | *:*TOS:*:*)
-  echo m68k-unknown-mint${UNAME_RELEASE}
+  echo m68k-unknown-mint"$UNAME_RELEASE"
   exit ;;
     m68k:machten:*:*)
-  echo m68k-apple-machten${UNAME_RELEASE}
+  echo m68k-apple-machten"$UNAME_RELEASE"
   exit ;;
     powerpc:machten:*:*)
-  echo powerpc-apple-machten${UNAME_RELEASE}
+  echo powerpc-apple-machten"$UNAME_RELEASE"
   exit ;;
     RISC*:Mach:*:*)
   echo mips-dec-mach_bsd4.3
   exit ;;
     RISC*:ULTRIX:*:*)
-  echo mips-dec-ultrix${UNAME_RELEASE}
+  echo mips-dec-ultrix"$UNAME_RELEASE"
   exit ;;
     VAX*:ULTRIX*:*:*)
-  echo vax-dec-ultrix${UNAME_RELEASE}
+  echo vax-dec-ultrix"$UNAME_RELEASE"
   exit ;;
     2020:CLIX:*:* | 2430:CLIX:*:*)
-  echo clipper-intergraph-clix${UNAME_RELEASE}
+  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[]) {
 #else
   int main (argc, argv) int argc; char *argv[]; {
 #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${UNAME_RELEASE}
+  echo mips-mips-riscos"$UNAME_RELEASE"
   exit ;;
     Motorola:PowerMAX_OS:*:*)
   echo powerpc-motorola-powermax
   exit ;;
     Motorola:*:4.3:PL8-*)
   echo powerpc-harris-powermax
   exit ;;
     Night_Hawk:*:*:PowerMAX_OS | Synergy:PowerMAX_OS:*:*)
   echo powerpc-harris-powermax
   exit ;;
     Night_Hawk:Power_UNIX:*:*)
   echo powerpc-harris-powerunix
   exit ;;
     m88k:CX/UX:7*:*)
   echo m88k-harris-cxux7
   exit ;;
     m88k:*:4*:R4*)
   echo m88k-motorola-sysv4
   exit ;;
     m88k:*:3*:R3*)
   echo m88k-motorola-sysv3
   exit ;;
     AViiON:dgux:*:*)
   # DG/UX returns AViiON for all architectures
-  UNAME_PROCESSOR=`/usr/bin/uname -p`
-  if [ $UNAME_PROCESSOR = mc88100 ] || [ $UNAME_PROCESSOR = mc88110 ]
+  UNAME_PROCESSOR=$(/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 ;;
     M88*:DolphinOS:*:*) # DolphinOS (SVR3)
   echo m88k-dolphin-sysv3
   exit ;;
     M88*:*:R3*:*)
   # Delta 88k system running SVR3
   echo m88k-motorola-sysv3
   exit ;;
     XD88*:*:*:*) # Tektronix XD88 system running UTekV (SVR3)
   echo m88k-tektronix-sysv3
   exit ;;
     Tek43[0-9][0-9]:UTek:*:*) # Tektronix 4300 system running UTek (BSD)
   echo m68k-tektronix-bsd
   exit ;;
     *:IRIX*:*:*)
-  echo mips-sgi-irix`echo ${UNAME_RELEASE}|sed -e 's/-/_/g'`
+  echo mips-sgi-irix"$(echo "$UNAME_RELEASE"|sed -e 's/-/_/g')"
   exit ;;
     ????????:AIX?:[12].1:2)   # AIX 2.2.1 or AIX 2.1.1 is RT/PC AIX.
   echo romp-ibm-aix     # uname -m gives an 8 hex-code CPU id
-  exit ;;               # Note that: echo "'`uname -s`'" gives 'AIX '
+  exit ;;               # Note that: echo "'$(uname -s)'" gives 'AIX '
     i*86:AIX:*:*)
   echo i386-ibm-aix
   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}
+  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()
       {
       if (!__power_pc())
         exit(1);
       puts("powerpc-ibm-aix3.2.5");
       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"
     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 ;;
     *:AIX:*:[4567])
-  IBM_CPU_ID=`/usr/sbin/lsdev -C -c processor -S available | sed 1q | awk '{ print $1 }'`
-  if /usr/sbin/lsattr -El ${IBM_CPU_ID} | grep ' POWER' >/dev/null 2>&1; then
+  IBM_CPU_ID=$(/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}
+  echo "$IBM_ARCH"-ibm-aix"$IBM_REV"
   exit ;;
     *:AIX:*:*)
   echo rs6000-ibm-aix
   exit ;;
-    ibmrt:4.4BSD:*|romp-ibm:BSD:*)
+    ibmrt:4.4BSD:*|romp-ibm:4.4BSD:*)
   echo romp-ibm-bsd4.4
   exit ;;
     ibmrt:*BSD:*|romp-ibm:BSD:*)            # covers RT/PC BSD and
-  echo romp-ibm-bsd${UNAME_RELEASE}   # 4.3 with uname added to
+  echo romp-ibm-bsd"$UNAME_RELEASE"   # 4.3 with uname added to
   exit ;;                             # report: romp-ibm BSD 4.3
     *:BOSX:*:*)
   echo rs6000-bull-bosx
   exit ;;
     DPX/2?00:B.O.S.:*:*)
   echo m68k-bull-sysv3
   exit ;;
     9000/[34]??:4.3bsd:1.*:*)
   echo m68k-hp-bsd
   exit ;;
     hp300:4.4BSD:*:* | 9000/[34]??:4.3bsd:2.*:*)
   echo m68k-hp-bsd4.4
   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
+    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
+      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>
 
     int main ()
     {
     #if defined(_SC_KERNEL_BITS)
case "$UNAME_MACHINE" in
     #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
       # 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) |
+      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}
+  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}
+  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 ()
   {
     long cpu = sysconf (_SC_CPU_VERSION);
     /* The order matters, because CPU_IS_HP_MC68K erroneously returns
        true for CPU_PA_RISC1_0.  CPU_IS_PA_RISC returns correct
        results, however.  */
     if (CPU_IS_PA_RISC (cpu))
       {
         switch (cpu)
     {
       case CPU_PA_RISC1_0: puts ("hppa1.0-hitachi-hiuxwe2"); break;
       case CPU_PA_RISC1_1: puts ("hppa1.1-hitachi-hiuxwe2"); break;
       case CPU_PA_RISC2_0: puts ("hppa2.0-hitachi-hiuxwe2"); break;
       default: puts ("hppa-hitachi-hiuxwe2"); break;
     }
       }
     else if (CPU_IS_HP_MC68K (cpu))
       puts ("m68k-hitachi-hiuxwe2");
     else puts ("unknown-hitachi-hiuxwe2");
     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:*:* )
+    9000/7??:4.3bsd:*:* | 9000/8?[79]:4.3bsd:*:*)
   echo hppa1.1-hp-bsd
   exit ;;
     9000/8??:4.3bsd:*:*)
   echo hppa1.0-hp-bsd
   exit ;;
     *9??*:MPE/iX:*:* | *3000*:MPE/iX:*:*)
   echo hppa1.0-hp-mpeix
   exit ;;
-    hp7??:OSF1:*:* | hp8?[79]:OSF1:*:* )
+    hp7??:OSF1:*:* | hp8?[79]:OSF1:*:*)
   echo hppa1.1-hp-osf
   exit ;;
     hp8??:OSF1:*:*)
   echo hppa1.0-hp-osf
   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 ;;
     parisc*:Lites*:*:*)
   echo hppa1.1-hp-lites
   exit ;;
     C1*:ConvexOS:*:* | convex:ConvexOS:C1*:*)
   echo c1-convex-bsd
   exit ;;
     C2*:ConvexOS:*:* | convex:ConvexOS:C2*:*)
   if getsysinfo -f scalar_acc
   then echo c32-convex-bsd
   else echo c2-convex-bsd
   fi
   exit ;;
     C34*:ConvexOS:*:* | convex:ConvexOS:C34*:*)
   echo c34-convex-bsd
   exit ;;
     C38*:ConvexOS:*:* | convex:ConvexOS:C38*:*)
   echo c38-convex-bsd
   exit ;;
     C4*:ConvexOS:*:* | convex:ConvexOS:C4*:*)
   echo c4-convex-bsd
   exit ;;
     CRAY*Y-MP:*:*:*)
-  echo ymp-cray-unicos${UNAME_RELEASE} | sed -e 's/\.[^.]*$/.X/'
+  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/\.[^.]*$/.X/'
   exit ;;
     CRAY*TS:*:*:*)
-  echo t90-cray-unicos${UNAME_RELEASE} | sed -e 's/\.[^.]*$/.X/'
+  echo t90-cray-unicos"$UNAME_RELEASE" | sed -e 's/\.[^.]*$/.X/'
   exit ;;
     CRAY*T3E:*:*:*)
-  echo alphaev5-cray-unicosmk${UNAME_RELEASE} | sed -e 's/\.[^.]*$/.X/'
+  echo alphaev5-cray-unicosmk"$UNAME_RELEASE" | sed -e 's/\.[^.]*$/.X/'
   exit ;;
     CRAY*SV1:*:*:*)
-  echo sv1-cray-unicos${UNAME_RELEASE} | sed -e 's/\.[^.]*$/.X/'
+  echo sv1-cray-unicos"$UNAME_RELEASE" | sed -e 's/\.[^.]*$/.X/'
   exit ;;
     *:UNICOS/mp:*:*)
-  echo craynv-cray-unicosmp${UNAME_RELEASE} | sed -e 's/\.[^.]*$/.X/'
+  echo craynv-cray-unicosmp"$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 ${UNAME_RELEASE} | sed -e 's/ /_/'`
+  FUJITSU_PROC=$(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 ${UNAME_RELEASE} | tr 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' 'abcdefghijklmnopqrstuvwxyz' | sed -e 's/ /_/'`
+  FUJITSU_SYS=$(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}
+  echo "$UNAME_MACHINE"-pc-bsdi"$UNAME_RELEASE"
   exit ;;
     sparc*:BSD/OS:*:*)
-  echo sparc-unknown-bsdi${UNAME_RELEASE}
+  echo sparc-unknown-bsdi"$UNAME_RELEASE"
   exit ;;
     *:BSD/OS:*:*)
-  echo ${UNAME_MACHINE}-unknown-bsdi${UNAME_RELEASE}
+  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:*:*)
-  UNAME_PROCESSOR=`/usr/bin/uname -p`
-  case ${UNAME_PROCESSOR} in
+  UNAME_PROCESSOR=$(/usr/bin/uname -p)
+  case "$UNAME_PROCESSOR" in
       amd64)
-    echo x86_64-unknown-freebsd`echo ${UNAME_RELEASE}|sed -e 's/[-(].*//'` ;;
-      *)
-    echo ${UNAME_PROCESSOR}-unknown-freebsd`echo ${UNAME_RELEASE}|sed -e 's/[-(].*//'` ;;
+    UNAME_PROCESSOR=x86_64 ;;
+      i386)
+    UNAME_PROCESSOR=i586 ;;
   esac
+  echo "$UNAME_PROCESSOR"-unknown-freebsd"$(echo "$UNAME_RELEASE"|sed -e 's/[-(].*//')"
   exit ;;
     i*:CYGWIN*:*)
-  echo ${UNAME_MACHINE}-pc-cygwin
+  echo "$UNAME_MACHINE"-pc-cygwin
+  exit ;;
+    *:MINGW64*:*)
+  echo "$UNAME_MACHINE"-pc-mingw64
   exit ;;
     *:MINGW*:*)
-  echo ${UNAME_MACHINE}-pc-mingw32
+  echo "$UNAME_MACHINE"-pc-mingw32
   exit ;;
     *:MSYS*:*)
-  echo ${UNAME_MACHINE}-pc-msys
-  exit ;;
-    i*:windows32*:*)
-  # uname -m includes "-pc" on this system.
-  echo ${UNAME_MACHINE}-mingw32
+  echo "$UNAME_MACHINE"-pc-msys
   exit ;;
     i*:PW*:*)
-  echo ${UNAME_MACHINE}-pc-pw32
+  echo "$UNAME_MACHINE"-pc-pw32
   exit ;;
     *:Interix*:*)
-  case ${UNAME_MACHINE} in
+  case "$UNAME_MACHINE" in
       x86)
-    echo i586-pc-interix${UNAME_RELEASE}
+    echo i586-pc-interix"$UNAME_RELEASE"
     exit ;;
       authenticamd | genuineintel | EM64T)
-    echo x86_64-unknown-interix${UNAME_RELEASE}
+    echo x86_64-unknown-interix"$UNAME_RELEASE"
     exit ;;
       IA64)
-    echo ia64-unknown-interix${UNAME_RELEASE}
+    echo ia64-unknown-interix"$UNAME_RELEASE"
     exit ;;
   esac ;;
-    [345]86:Windows_95:* | [345]86:Windows_98:* | [345]86:Windows_NT:*)
-  echo i${UNAME_MACHINE}-pc-mks
-  exit ;;
-    8664:Windows_NT:*)
-  echo x86_64-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 ${UNAME_MACHINE}-pc-uwin
+  echo "$UNAME_MACHINE"-pc-uwin
   exit ;;
     amd64:CYGWIN*:*:* | x86_64:CYGWIN*:*:*)
-  echo x86_64-unknown-cygwin
-  exit ;;
-    p*:CYGWIN*:*)
-  echo powerpcle-unknown-cygwin
+  echo x86_64-pc-cygwin
   exit ;;
     prep*:SunOS:5.*:*)
-  echo powerpcle-unknown-solaris2`echo ${UNAME_RELEASE}|sed -e 's/[^.]*//'`
+  echo powerpcle-unknown-solaris2"$(echo "$UNAME_RELEASE"|sed -e 's/[^.]*//')"
   exit ;;
     *:GNU:*:*)
   # the GNU system
-  echo `echo ${UNAME_MACHINE}|sed -e 's,[-/].*$,,'`-unknown-gnu`echo ${UNAME_RELEASE}|sed -e 's,/.*$,,'`
+  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 ${UNAME_RELEASE}|sed -e 's/[-(].*//'`-gnu
+  echo "$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 ;;
-    i*86:Minix:*:*)
-  echo ${UNAME_MACHINE}-pc-minix
+    aarch64:Linux:*:*)
+  echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
   exit ;;
-    aarch64*:Linux:*)
-      echo ${UNAME_MACHINE}-unknown-linux-gnu
+    aarch64_be:Linux:*:*)
+  UNAME_MACHINE=aarch64_be
+  echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
   exit ;;
     alpha:Linux:*:*)
-  case `sed -n '/^cpu model/s/^.*: \(.*\)/\1/p' < /proc/cpuinfo` in
+  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="libc1" ; else LIBC="" ; fi
-  echo ${UNAME_MACHINE}-unknown-linux-gnu${LIBC}
+  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:*:*)
-  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 ${UNAME_MACHINE}-unknown-linux-gnu
+      echo "$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 ${UNAME_MACHINE}-unknown-linux-gnueabi
+    echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"eabi
       else
-    echo ${UNAME_MACHINE}-unknown-linux-gnueabihf
+    echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"eabihf
       fi
   fi
   exit ;;
     avr32*:Linux:*:*)
-  echo ${UNAME_MACHINE}-unknown-linux-gnu
+  echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
   exit ;;
     cris:Linux:*:*)
-  echo cris-axis-linux-gnu
+  echo "$UNAME_MACHINE"-axis-linux-"$LIBC"
   exit ;;
     crisv32:Linux:*:*)
-  echo crisv32-axis-linux-gnu
+  echo "$UNAME_MACHINE"-axis-linux-"$LIBC"
+  exit ;;
+    e2k:Linux:*:*)
+  echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
   exit ;;
     frv:Linux:*:*)
-  echo frv-unknown-linux-gnu
+  echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
+  exit ;;
+    hexagon:Linux:*:*)
+  echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
   exit ;;
     i*86:Linux:*:*)
-  LIBC=gnu
-  eval $set_cc_for_build
-  sed 's/^ //' << EOF >$dummy.c
-  #ifdef __dietlibc__
-  LIBC=dietlibc
-  #endif
-EOF
-  eval `$CC_FOR_BUILD -E $dummy.c 2>/dev/null | grep '^LIBC'`
-  echo "${UNAME_MACHINE}-pc-linux-${LIBC}"
+  echo "$UNAME_MACHINE"-pc-linux-"$LIBC"
   exit ;;
     ia64:Linux:*:*)
-  echo ${UNAME_MACHINE}-unknown-linux-gnu
+  echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
+  exit ;;
+    k1om:Linux:*:*)
+  echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
+  exit ;;
+    loongarch32:Linux:*:* | loongarch64:Linux:*:* | loongarchx32:Linux:*:*)
+  echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
   exit ;;
     m32r*:Linux:*:*)
-  echo ${UNAME_MACHINE}-unknown-linux-gnu
+  echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
   exit ;;
     m68*:Linux:*:*)
-  echo ${UNAME_MACHINE}-unknown-linux-gnu
+  echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
   exit ;;
     mips:Linux:*:* | mips64:Linux:*:*)
-  eval $set_cc_for_build
-  sed 's/^ //' << EOF >$dummy.c
+  set_cc_for_build
+  IS_GLIBC=0
+  test x"${LIBC}" = xgnu && IS_GLIBC=1
+  sed 's/^ //' << EOF > "$dummy.c"
   #undef CPU
-  #undef ${UNAME_MACHINE}
-  #undef ${UNAME_MACHINE}el
+  #undef mips
+  #undef mipsel
+  #undef mips64
+  #undef mips64el
+  #if ${IS_GLIBC} && defined(_ABI64)
+  LIBCABI=gnuabi64
+  #else
+  #if ${IS_GLIBC} && defined(_ABIN32)
+  LIBCABI=gnuabin32
+  #else
+  LIBCABI=${LIBC}
+  #endif
+  #endif
+
+  #if ${IS_GLIBC} && defined(__mips64) && defined(__mips_isa_rev) && __mips_isa_rev>=6
+  CPU=mipsisa64r6
+  #else
+  #if ${IS_GLIBC} && !defined(__mips64) && defined(__mips_isa_rev) && __mips_isa_rev>=6
+  CPU=mipsisa32r6
+  #else
+  #if defined(__mips64)
+  CPU=mips64
+  #else
+  CPU=mips
+  #endif
+  #endif
+  #endif
+
   #if defined(__MIPSEL__) || defined(__MIPSEL) || defined(_MIPSEL) || defined(MIPSEL)
-  CPU=${UNAME_MACHINE}el
+  MIPS_ENDIAN=el
   #else
   #if defined(__MIPSEB__) || defined(__MIPSEB) || defined(_MIPSEB) || defined(MIPSEB)
-  CPU=${UNAME_MACHINE}
+  MIPS_ENDIAN=
   #else
-  CPU=
+  MIPS_ENDIAN=
   #endif
   #endif
 EOF
-  eval `$CC_FOR_BUILD -E $dummy.c 2>/dev/null | grep '^CPU'`
-  test x"${CPU}" != x && { echo "${CPU}-unknown-linux-gnu"; exit; }
+  eval "$($CC_FOR_BUILD -E "$dummy.c" 2>/dev/null | grep '^CPU\|^MIPS_ENDIAN\|^LIBCABI')"
+  test "x$CPU" != x && { echo "$CPU${MIPS_ENDIAN}-unknown-linux-$LIBCABI"; exit; }
   ;;
-    or32:Linux:*:*)
-  echo or32-unknown-linux-gnu
+    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-"$LIBC"
   exit ;;
     padre:Linux:*:*)
-  echo sparc-unknown-linux-gnu
+  echo sparc-unknown-linux-"$LIBC"
   exit ;;
     parisc64:Linux:*:* | hppa64:Linux:*:*)
-  echo hppa64-unknown-linux-gnu
+  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 ;;
     ppc64:Linux:*:*)
-  echo powerpc64-unknown-linux-gnu
-  exit ;;
-    ppc64le:Linux:*:*)
-  echo powerpc64le-unknown-linux-gnu
+  echo powerpc64-unknown-linux-"$LIBC"
   exit ;;
     ppc:Linux:*:*)
-  echo powerpc-unknown-linux-gnu
+  echo powerpc-unknown-linux-"$LIBC"
+  exit ;;
+    ppc64le:Linux:*:*)
+  echo powerpc64le-unknown-linux-"$LIBC"
   exit ;;
     ppcle:Linux:*:*)
-  echo powerpcle-unknown-linux-gnu
+  echo powerpcle-unknown-linux-"$LIBC"
   exit ;;
-    riscv32:Linux:*:* | riscv64:Linux:*:*)
-  LIBC=gnu
-  eval $set_cc_for_build
-  # Do not check for __GLIBC__ because uclibc defines it too
-  sed 's/^ //' << EOF >$dummy.c
-  #include <features.h>
-  #if defined(__UCLIBC__)
-  LIBC=uclibc
-  #elif defined(__dietlibc__)
-  LIBC=dietlibc
-  #endif
-EOF
-  eval `$CC_FOR_BUILD -E $dummy.c 2>/dev/null | grep '^LIBC'`
-
-  # There is no features test macro for musl
-  # Follow the GNU's config.guess approach of
-  # checking the output of ldd
-  if command -v ldd >/dev/null && \
-    ldd --version 2>&1 | grep -q ^musl; then
-      LIBC=musl
-  fi
-
-  echo ${UNAME_MACHINE}-unknown-linux-${LIBC}
+    riscv32:Linux:*:* | riscv32be:Linux:*:* | riscv64:Linux:*:* | riscv64be:Linux:*:*)
+  echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
   exit ;;
     s390:Linux:*:* | s390x:Linux:*:*)
-  echo ${UNAME_MACHINE}-ibm-linux
+  echo "$UNAME_MACHINE"-ibm-linux-"$LIBC"
   exit ;;
     sh64*:Linux:*:*)
-  echo ${UNAME_MACHINE}-unknown-linux-gnu
+  echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
   exit ;;
     sh*:Linux:*:*)
-  echo ${UNAME_MACHINE}-unknown-linux-gnu
+  echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
   exit ;;
     sparc:Linux:*:* | sparc64:Linux:*:*)
-  echo ${UNAME_MACHINE}-unknown-linux-gnu
+  echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
   exit ;;
     tile*:Linux:*:*)
-  echo ${UNAME_MACHINE}-unknown-linux-gnu
+  echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
   exit ;;
     vax:Linux:*:*)
-  echo ${UNAME_MACHINE}-dec-linux-gnu
+  echo "$UNAME_MACHINE"-dec-linux-"$LIBC"
   exit ;;
     x86_64:Linux:*:*)
-  echo x86_64-unknown-linux-gnu
+  set_cc_for_build
+  LIBCABI=$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 ${UNAME_MACHINE}-unknown-linux-gnu
+  echo "$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 ;;
     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,
   # I just have to hope.  -- rms.
   # Use sysv4.2uw... so that sysv4* matches it.
-  echo ${UNAME_MACHINE}-pc-sysv4.2uw${UNAME_VERSION}
+  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 ${UNAME_MACHINE}-pc-os2-emx
+  echo "$UNAME_MACHINE"-pc-os2-emx
   exit ;;
     i*86:XTS-300:*:STOP)
-  echo ${UNAME_MACHINE}-unknown-stop
+  echo "$UNAME_MACHINE"-unknown-stop
   exit ;;
     i*86:atheos:*:*)
-  echo ${UNAME_MACHINE}-unknown-atheos
+  echo "$UNAME_MACHINE"-unknown-atheos
   exit ;;
     i*86:syllable:*:*)
-  echo ${UNAME_MACHINE}-pc-syllable
+  echo "$UNAME_MACHINE"-pc-syllable
   exit ;;
     i*86:LynxOS:2.*:* | i*86:LynxOS:3.[01]*:* | i*86:LynxOS:4.[02]*:*)
-  echo i386-unknown-lynxos${UNAME_RELEASE}
+  echo i386-unknown-lynxos"$UNAME_RELEASE"
   exit ;;
     i*86:*DOS:*:*)
-  echo ${UNAME_MACHINE}-pc-msdosdjgpp
+  echo "$UNAME_MACHINE"-pc-msdosdjgpp
   exit ;;
-    i*86:*:4.*:* | i*86:SYSTEM_V:4.*:*)
-  UNAME_REL=`echo ${UNAME_RELEASE} | sed 's/\/MP$//'`
+    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 ;;
     i*86:*:5:[678]*)
   # UnixWare 7.x, OpenUNIX and OpenServer 6.
-  case `/bin/uname -X | grep "^Machine"` in
+  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}
+  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
     (/bin/uname -X|grep '^Machine.*Pent *II' >/dev/null) \
       && 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 ;;
     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 i586.
   # Note: whatever this is, it MUST be the same as what config.sub
-  # prints for the "djgpp" host, or else GDB configury will decide that
+  # 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 ;;
     paragon:*:*:*)
   echo i860-intel-osf1
   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 ;;
     mini*:CTIX:SYS*5:*)
   # "miniframe"
   echo m68010-convergent-sysv
   exit ;;
     mc68k:UNIX:SYSTEM5:3.51m)
   echo m68k-convergent-sysv
   exit ;;
     M680?0:D-NIX:5.3:*)
   echo m68k-diab-dnix
   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${OS_REL}; exit; }
+    && { echo i486-ncr-sysv4.3"$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; } ;;
     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`
+      && 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; }
   /bin/uname -p 2>/dev/null | /bin/grep pteron >/dev/null \
-      && { echo i586-ncr-sysv4.3${OS_REL}; exit; } ;;
+      && { echo i586-ncr-sysv4.3"$OS_REL"; exit; } ;;
     m68*:LynxOS:2.*:* | m68*:LynxOS:3.0*:*)
-  echo m68k-unknown-lynxos${UNAME_RELEASE}
+  echo m68k-unknown-lynxos"$UNAME_RELEASE"
   exit ;;
     mc68030:UNIX_System_V:4.*:*)
   echo m68k-atari-sysv4
   exit ;;
     TSUNAMI:LynxOS:2.*:*)
-  echo sparc-unknown-lynxos${UNAME_RELEASE}
+  echo sparc-unknown-lynxos"$UNAME_RELEASE"
   exit ;;
     rs6000:LynxOS:2.*:*)
-  echo rs6000-unknown-lynxos${UNAME_RELEASE}
+  echo rs6000-unknown-lynxos"$UNAME_RELEASE"
   exit ;;
     PowerPC:LynxOS:2.*:* | PowerPC:LynxOS:3.[01]*:* | PowerPC:LynxOS:4.[02]*:*)
-  echo powerpc-unknown-lynxos${UNAME_RELEASE}
+  echo powerpc-unknown-lynxos"$UNAME_RELEASE"
   exit ;;
     SM[BE]S:UNIX_SV:*:*)
-  echo mips-dde-sysv${UNAME_RELEASE}
+  echo mips-dde-sysv"$UNAME_RELEASE"
   exit ;;
     RM*:ReliantUNIX-*:*:*)
   echo mips-sni-sysv4
   exit ;;
     RM*:SINIX-*:*:*)
   echo mips-sni-sysv4
   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 ;;
     PENTIUM:*:4.0*:*) # Unisys `ClearPath HMP IX 4000' SVR4/MP effort
       # says <[e-mail]>
   echo i586-unisys-sysv4
   exit ;;
     *:UNIX_System_V:4*:FTX*)
   # From Gerald Hewes <[e-mail]>.
   # How about differentiating between stratus architectures? -djm
   echo hppa1.1-stratus-sysv4
   exit ;;
     *:*:*:FTX*)
   # From [e-mail].
   echo i860-stratus-sysv4
   exit ;;
     i*86:VOS:*:*)
   # From [e-mail].
-  echo ${UNAME_MACHINE}-stratus-vos
+  echo "$UNAME_MACHINE"-stratus-vos
   exit ;;
     *:VOS:*:*)
   # From [e-mail].
   echo hppa1.1-stratus-vos
   exit ;;
     mc68*:A/UX:*:*)
-  echo m68k-apple-aux${UNAME_RELEASE}
+  echo m68k-apple-aux"$UNAME_RELEASE"
   exit ;;
     news*:NEWS-OS:6*:*)
   echo mips-sony-newsos6
   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 ;;
     BeBox:BeOS:*:*) # BeOS running on hardware made by Be, PPC only.
   echo powerpc-be-beos
   exit ;;
     BeMac:BeOS:*:*) # BeOS running on Mac or Mac clone, PPC only.
   echo powerpc-apple-beos
   exit ;;
     BePC:BeOS:*:*)  # BeOS running on Intel PC compatible.
   echo i586-pc-beos
   exit ;;
     BePC:Haiku:*:*) # Haiku running on Intel PC compatible.
   echo i586-pc-haiku
   exit ;;
-    x86_64:Haiku:*:*) # Haiku running on x86_64.
+    x86_64:Haiku:*:*)
   echo x86_64-unknown-haiku
   exit ;;
     SX-4:SUPER-UX:*:*)
-  echo sx4-nec-superux${UNAME_RELEASE}
+  echo sx4-nec-superux"$UNAME_RELEASE"
   exit ;;
     SX-5:SUPER-UX:*:*)
-  echo sx5-nec-superux${UNAME_RELEASE}
+  echo sx5-nec-superux"$UNAME_RELEASE"
   exit ;;
     SX-6:SUPER-UX:*:*)
-  echo sx6-nec-superux${UNAME_RELEASE}
+  echo sx6-nec-superux"$UNAME_RELEASE"
   exit ;;
     SX-7:SUPER-UX:*:*)
-  echo sx7-nec-superux${UNAME_RELEASE}
+  echo sx7-nec-superux"$UNAME_RELEASE"
   exit ;;
     SX-8:SUPER-UX:*:*)
-  echo sx8-nec-superux${UNAME_RELEASE}
+  echo sx8-nec-superux"$UNAME_RELEASE"
   exit ;;
     SX-8R:SUPER-UX:*:*)
-  echo sx8r-nec-superux${UNAME_RELEASE}
+  echo sx8r-nec-superux"$UNAME_RELEASE"
+  exit ;;
+    SX-ACE:SUPER-UX:*:*)
+  echo sxace-nec-superux"$UNAME_RELEASE"
   exit ;;
     Power*:Rhapsody:*:*)
-  echo powerpc-apple-rhapsody${UNAME_RELEASE}
+  echo powerpc-apple-rhapsody"$UNAME_RELEASE"
   exit ;;
     *:Rhapsody:*:*)
-  echo ${UNAME_MACHINE}-apple-rhapsody${UNAME_RELEASE}
+  echo "$UNAME_MACHINE"-apple-rhapsody"$UNAME_RELEASE"
+  exit ;;
+    arm64:Darwin:*:*)
+  echo aarch64-apple-darwin"$UNAME_RELEASE"
   exit ;;
     *:Darwin:*:*)
-  UNAME_PROCESSOR=`uname -p` || UNAME_PROCESSOR=unknown
+  UNAME_PROCESSOR=$(uname -p)
   case $UNAME_PROCESSOR in
-      i386)
-    eval $set_cc_for_build
-    if [ "$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
-          UNAME_PROCESSOR="x86_64"
-      fi
-    fi ;;
-    arm)
-    eval $set_cc_for_build
-    if [ "$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
-        if (echo '#ifdef __PTRAUTH_INTRINSICS__'; echo HAS_AUTH; echo '#endif') | \
-          (CCOPTS= $CC_FOR_BUILD -E - 2>/dev/null) | \
-          grep HAS_AUTH >/dev/null
-        then
-          UNAME_PROCESSOR="arm64e"
-        else
-          UNAME_PROCESSOR="arm64"
-        fi
-      fi
-    fi ;;
-      unknown) UNAME_PROCESSOR=powerpc ;;
-  esac
-  echo ${UNAME_PROCESSOR}-apple-darwin${UNAME_RELEASE}
+      unknown) UNAME_PROCESSOR=powerpc ;;
+  esac
+  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=$UNAME_MACHINE
+  echo "$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${UNAME_RELEASE}
+  echo "$UNAME_PROCESSOR"-"$UNAME_MACHINE"-nto-qnx"$UNAME_RELEASE"
   exit ;;
     *:QNX:*:4*)
   echo i386-pc-qnx
   exit ;;
-    NEO-?:NONSTOP_KERNEL:*:*)
-  echo neo-tandem-nsk${UNAME_RELEASE}
+    NEO-*:NONSTOP_KERNEL:*:*)
+  echo neo-tandem-nsk"$UNAME_RELEASE"
+  exit ;;
+    NSE-*:NONSTOP_KERNEL:*:*)
+  echo nse-tandem-nsk"$UNAME_RELEASE"
   exit ;;
-    NSE-?:NONSTOP_KERNEL:*:*)
-  echo nse-tandem-nsk${UNAME_RELEASE}
+    NSR-*:NONSTOP_KERNEL:*:*)
+  echo nsr-tandem-nsk"$UNAME_RELEASE"
   exit ;;
-    NSR-?:NONSTOP_KERNEL:*:*)
-  echo nsr-tandem-nsk${UNAME_RELEASE}
+    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 ;;
     BS2000:POSIX*:*:*)
   echo bs2000-siemens-sysv
   exit ;;
     DS/*:UNIX_System_V:*:*)
-  echo ${UNAME_MACHINE}-${UNAME_SYSTEM}-${UNAME_RELEASE}
+  echo "$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 ${UNAME_MACHINE}-unknown-plan9
+  echo "$UNAME_MACHINE"-unknown-plan9
   exit ;;
     *:TOPS-10:*:*)
   echo pdp10-unknown-tops10
   exit ;;
     *:TENEX:*:*)
   echo pdp10-unknown-tenex
   exit ;;
     KS10:TOPS-20:*:* | KL10:TOPS-20:*:* | TYPE4:TOPS-20:*:*)
   echo pdp10-dec-tops20
   exit ;;
     XKL-1:TOPS-20:*:* | TYPE5:TOPS-20:*:*)
   echo pdp10-xkl-tops20
   exit ;;
     *:TOPS-20:*:*)
   echo pdp10-unknown-tops20
   exit ;;
     *:ITS:*:*)
   echo pdp10-unknown-its
   exit ;;
     SEI:*:*:SEIUX)
-  echo mips-sei-seiux${UNAME_RELEASE}
+  echo mips-sei-seiux"$UNAME_RELEASE"
   exit ;;
     *:DragonFly:*:*)
-  echo ${UNAME_MACHINE}-unknown-dragonfly`echo ${UNAME_RELEASE}|sed -e 's/[-(].*//'`
+  echo "$UNAME_MACHINE"-unknown-dragonfly"$(echo "$UNAME_RELEASE"|sed -e 's/[-(].*//')"
   exit ;;
     *:*VMS:*:*)
-  UNAME_MACHINE=`(uname -p) 2>/dev/null`
-  case "${UNAME_MACHINE}" in
+  UNAME_MACHINE=$( (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 ${UNAME_RELEASE}` | sed -e 's/ .*$//'
+  echo "$UNAME_MACHINE"-pc-skyos"$(echo "$UNAME_RELEASE" | sed -e 's/ .*$//')"
   exit ;;
     i*86:rdos:*:*)
-  echo ${UNAME_MACHINE}-pc-rdos
+  echo "$UNAME_MACHINE"-pc-rdos
+  exit ;;
+    *:AROS:*:*)
+  echo "$UNAME_MACHINE"-unknown-aros
+  exit ;;
+    x86_64:VMkernel:*:*)
+  echo "$UNAME_MACHINE"-unknown-esx
   exit ;;
-    i*86:AROS:*:*)
-  echo ${UNAME_MACHINE}-pc-aros
+    amd64:Isilon\ OneFS:*:*)
+  echo x86_64-unknown-onefs
+  exit ;;
+    *:Unleashed:*:*)
+  echo "$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 ()
 {
 #if defined (sony)
 #if defined (MIPSEB)
   /* BFD wants "bsd" instead of "newsos".  Perhaps BFD should be changed,
      I don't know....  */
   printf ("mips-sony-bsd\n"); exit (0);
 #else
 #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\n"); 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
     printf ("%s-next-openstep%d\n", __ARCHITECTURE__, version);
   exit (0);
 #endif
 
 #if defined (MULTIMAX) || defined (n16)
#if defined (i386)
   printf ("i386-sequent-dynix\n"); exit (0);
 #endif
 #if defined (ns32000)
   printf ("ns32k-sequent-dynix\n"); exit (0);
 #endif
 #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);
-
+    printf ("i386-sequent-ptx2\n"); exit (0);
+    printf ("i386-sequent-ptx1\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
+#else
+#if BSD == 199006
+#else
+#endif
+#endif
+#else
+#endif
+#else
+#if defined(_SIZE_T_) || defined(SIGLOST)
+  struct utsname un;
+  uname (&un);
+  printf ("vax-dec-ultrix%s\n", un.release); exit (0);
+#else
+#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)
   printf ("i860-alliant-bsd\n"); exit (0);
 #endif
 
   exit (1);
 }
 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
+  ;;
 
 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 ($0) is already up to date, please
-send the following data and any information you think might be
-pertinent to <[e-mail]> in order to provide the needed
-information to handle your system.
+year=$(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 [e-mail] 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`
-
-/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`
-
-UNAME_MACHINE = ${UNAME_MACHINE}
-UNAME_RELEASE = ${UNAME_RELEASE}
-UNAME_SYSTEM  = ${UNAME_SYSTEM}
-UNAME_VERSION = ${UNAME_VERSION}
+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)
+
+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"
 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: "'"
 # End: