]> git.ipfire.org Git - thirdparty/gcc.git/blobdiff - config.guess
testsuite: fix analyzer C++ failures on Solaris [PR111475]
[thirdparty/gcc.git] / config.guess
index 445c406836e2e427a30ecc53bab1c501c30bf4f6..1972fda8eb05d040c1390495644252fc92fa2d10 100755 (executable)
@@ -1,8 +1,8 @@
 #! /bin/sh
 # Attempt to guess a canonical system name.
-#   Copyright 1992-2018 Free Software Foundation, Inc.
+#   Copyright 1992-2021 Free Software Foundation, Inc.
 
-timestamp='2018-06-26'
+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
@@ -27,12 +27,12 @@ timestamp='2018-06-26'
 # Originally written by Per Bothner; maintained since 2000 by Ben Elliston.
 #
 # You can get the latest version of this script from:
-# https://git.savannah.gnu.org/gitweb/?p=config.git;a=blob_plain;f=config.guess
+# https://git.savannah.gnu.org/cgit/config.git/plain/config.guess
 #
 # Please send patches to <config-patches@gnu.org>.
 
 
-me=`echo "$0" | sed -e 's,.*/,,'`
+me=$(echo "$0" | sed -e 's,.*/,,')
 
 usage="\
 Usage: $0 [OPTION]
@@ -50,7 +50,7 @@ version="\
 GNU config.guess ($timestamp)
 
 Originally written by Per Bothner.
-Copyright 1992-2018 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."
@@ -84,8 +84,6 @@ if test $# != 0; then
   exit 1
 fi
 
-trap 'exit 1' 1 2 15
-
 # CC_FOR_BUILD -- compiler used by this script. Note that the use of a
 # compiler to aid in system detection is discouraged as it requires
 # temporary files to be created and, as you can see below, it is a
@@ -96,66 +94,82 @@ 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
+    : "${TMPDIR=/tmp}"
+    # shellcheck disable=SC2039
+    { tmp=$( (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_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/*)
-       # If the system lacks a compiler, then just pick glibc.
-       # We could probably try harder.
-       LIBC=gnu
+       LIBC=unknown
 
-       eval "$set_cc_for_build"
+       set_cc_for_build
        cat <<-EOF > "$dummy.c"
        #include <features.h>
        #if defined(__UCLIBC__)
        LIBC=uclibc
        #elif defined(__dietlibc__)
        LIBC=dietlibc
-       #else
+       #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'`"
+       eval "$($CC_FOR_BUILD -E "$dummy.c" 2>/dev/null | grep '^LIBC' | sed 's, ,,g')"
 
-       # If ldd exists, use it to detect musl libc.
-       if command -v ldd >/dev/null && \
-               ldd --version 2>&1 | grep -q ^musl
-       then
-           LIBC=musl
+       # 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
@@ -174,20 +188,20 @@ 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=`(uname -p 2>/dev/null || \
-           "/sbin/$sysctl" 2>/dev/null || \
-           "/usr/sbin/$sysctl" 2>/dev/null || \
-           echo unknown)`
+       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 ;;
            earmv*)
-               arch=`echo "$UNAME_MACHINE_ARCH" | sed -e 's,^e\(armv[0-9]\).*$,\1,'`
-               endian=`echo "$UNAME_MACHINE_ARCH" | sed -ne 's,^.*\(eb\)$,\1,p'`
+               arch=$(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 ;;
@@ -199,7 +213,7 @@ case "$UNAME_MACHINE:$UNAME_SYSTEM:$UNAME_RELEASE:$UNAME_VERSION" in
                os=netbsdelf
                ;;
            arm*|i386|m68k|ns32k|sh3*|sparc|vax)
-               eval "$set_cc_for_build"
+               set_cc_for_build
                if echo __ELF__ | $CC_FOR_BUILD -E - 2>/dev/null \
                        | grep -q __ELF__
                then
@@ -218,7 +232,7 @@ case "$UNAME_MACHINE:$UNAME_SYSTEM:$UNAME_RELEASE:$UNAME_VERSION" in
        case "$UNAME_MACHINE_ARCH" in
            earm*)
                expr='s/^earmv[0-9]/-eabi/;s/eb$//'
-               abi=`echo "$UNAME_MACHINE_ARCH" | sed -e "$expr"`
+               abi=$(echo "$UNAME_MACHINE_ARCH" | sed -e "$expr")
                ;;
        esac
        # The OS release
@@ -231,7 +245,7 @@ case "$UNAME_MACHINE:$UNAME_SYSTEM:$UNAME_RELEASE:$UNAME_VERSION" in
                release='-gnu'
                ;;
            *)
-               release=`echo "$UNAME_RELEASE" | sed -e 's/[-_].*//' | cut -d. -f1,2`
+               release=$(echo "$UNAME_RELEASE" | sed -e 's/[-_].*//' | cut -d. -f1,2)
                ;;
        esac
        # Since CPU_TYPE-MANUFACTURER-KERNEL-OPERATING_SYSTEM:
@@ -240,15 +254,15 @@ case "$UNAME_MACHINE:$UNAME_SYSTEM:$UNAME_RELEASE:$UNAME_VERSION" in
        echo "$machine-${os}${release}${abi-}"
        exit ;;
     *:Bitrig:*:*)
-       UNAME_MACHINE_ARCH=`arch | sed 's/Bitrig.//'`
+       UNAME_MACHINE_ARCH=$(arch | sed 's/Bitrig.//')
        echo "$UNAME_MACHINE_ARCH"-unknown-bitrig"$UNAME_RELEASE"
        exit ;;
     *:OpenBSD:*:*)
-       UNAME_MACHINE_ARCH=`arch | sed 's/OpenBSD.//'`
+       UNAME_MACHINE_ARCH=$(arch | sed 's/OpenBSD.//')
        echo "$UNAME_MACHINE_ARCH"-unknown-openbsd"$UNAME_RELEASE"
        exit ;;
     *:LibertyBSD:*:*)
-       UNAME_MACHINE_ARCH=`arch | sed 's/^.*BSD\.//'`
+       UNAME_MACHINE_ARCH=$(arch | sed 's/^.*BSD\.//')
        echo "$UNAME_MACHINE_ARCH"-unknown-libertybsd"$UNAME_RELEASE"
        exit ;;
     *:MidnightBSD:*:*)
@@ -260,6 +274,9 @@ case "$UNAME_MACHINE:$UNAME_SYSTEM:$UNAME_RELEASE:$UNAME_VERSION" in
     *:SolidBSD:*:*)
        echo "$UNAME_MACHINE"-unknown-solidbsd"$UNAME_RELEASE"
        exit ;;
+    *:OS108:*:*)
+       echo "$UNAME_MACHINE"-unknown-os108_"$UNAME_RELEASE"
+       exit ;;
     macppc:MirBSD:*:*)
        echo powerpc-unknown-mirbsd"$UNAME_RELEASE"
        exit ;;
@@ -269,26 +286,29 @@ case "$UNAME_MACHINE:$UNAME_SYSTEM:$UNAME_RELEASE:$UNAME_VERSION" in
     *:Sortix:*:*)
        echo "$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 ;;
+       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 ;;
@@ -326,7 +346,7 @@ case "$UNAME_MACHINE:$UNAME_SYSTEM:$UNAME_RELEASE:$UNAME_VERSION" in
        # 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
@@ -360,7 +380,7 @@ case "$UNAME_MACHINE:$UNAME_SYSTEM:$UNAME_RELEASE:$UNAME_VERSION" in
        exit ;;
     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
+       if test "$( (/bin/universe) 2>/dev/null)" = att ; then
                echo pyramid-pyramid-sysv3
        else
                echo pyramid-pyramid-bsd
@@ -373,28 +393,28 @@ case "$UNAME_MACHINE:$UNAME_SYSTEM:$UNAME_RELEASE:$UNAME_VERSION" in
        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"$UNAME_RELEASE"
        exit ;;
     i86pc:SunOS:5.*:* | i86xen:SunOS:5.*:*)
-       eval "$set_cc_for_build"
+       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="" $CC_FOR_BUILD -E - 2>/dev/null) | \
                grep IS_64BIT_ARCH >/dev/null
@@ -402,30 +422,30 @@ case "$UNAME_MACHINE:$UNAME_SYSTEM:$UNAME_RELEASE:$UNAME_VERSION" in
                SUN_ARCH=x86_64
            fi
        fi
-       echo "$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"
        exit ;;
     sun*:*:4.2BSD:*)
-       UNAME_RELEASE=`(sed 1q /etc/motd | awk '{print substr($5,1,3)}') 2>/dev/null`
+       UNAME_RELEASE=$( (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
+       case "$(/bin/arch)" in
            sun3)
                echo m68k-sun-sunos"$UNAME_RELEASE"
                ;;
@@ -482,7 +502,7 @@ case "$UNAME_MACHINE:$UNAME_SYSTEM:$UNAME_RELEASE:$UNAME_VERSION" in
        echo clipper-intergraph-clix"$UNAME_RELEASE"
        exit ;;
     mips:*:*:UMIPS | mips:*:*:RISCos)
-       eval "$set_cc_for_build"
+       set_cc_for_build
        sed 's/^        //' << EOF > "$dummy.c"
 #ifdef __cplusplus
 #include <stdio.h>  /* for printf() prototype */
@@ -505,8 +525,8 @@ case "$UNAME_MACHINE:$UNAME_SYSTEM:$UNAME_RELEASE:$UNAME_VERSION" in
        }
 EOF
        $CC_FOR_BUILD -o "$dummy" "$dummy.c" &&
-         dummyarg=`echo "$UNAME_RELEASE" | sed -n 's/\([0-9]*\).*/\1/p'` &&
-         SYSTEM_NAME=`"$dummy" "$dummyarg"` &&
+         dummyarg=$(echo "$UNAME_RELEASE" | sed -n 's/\([0-9]*\).*/\1/p') &&
+         SYSTEM_NAME=$("$dummy" "$dummyarg") &&
            { echo "$SYSTEM_NAME"; exit; }
        echo mips-mips-riscos"$UNAME_RELEASE"
        exit ;;
@@ -533,11 +553,11 @@ EOF
        exit ;;
     AViiON:dgux:*:*)
        # DG/UX returns AViiON for all architectures
-       UNAME_PROCESSOR=`/usr/bin/uname -p`
-       if [ "$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"$UNAME_RELEASE"
            else
@@ -561,17 +581,17 @@ EOF
        echo m68k-tektronix-bsd
        exit ;;
     *:IRIX*:*:*)
-       echo mips-sgi-irix"`echo "$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"
        fi
@@ -579,7 +599,7 @@ EOF
        exit ;;
     *:AIX:2:3)
        if grep bos325 /usr/include/stdio.h >/dev/null 2>&1; then
-               eval "$set_cc_for_build"
+               set_cc_for_build
                sed 's/^                //' << EOF > "$dummy.c"
                #include <sys/systemcfg.h>
 
@@ -591,7 +611,7 @@ 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"
                else
@@ -604,15 +624,15 @@ EOF
        fi
        exit ;;
     *:AIX:*:[4567])
-       IBM_CPU_ID=`/usr/sbin/lsdev -C -c processor -S available | sed 1q | awk '{ print $1 }'`
+       IBM_CPU_ID=$(/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/lslpp ] ; then
-               IBM_REV=`/usr/bin/lslpp -Lqc bos.rte.libc |
-                          awk -F: '{ print $3 }' | sed s/[0-9]*$/0/`
+       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"
        fi
@@ -640,14 +660,14 @@ EOF
        echo m68k-hp-bsd4.4
        exit ;;
     9000/[34678]??:HP-UX:*:*)
-       HPUX_REV=`echo "$UNAME_RELEASE"|sed -e 's/[^.]*.[0B]*//'`
+       HPUX_REV=$(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`
+               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 "$sc_cpu_version" in
                      523) HP_ARCH=hppa1.0 ;; # CPU_PA_RISC1_0
                      528) HP_ARCH=hppa1.1 ;; # CPU_PA_RISC1_1
@@ -659,8 +679,8 @@ EOF
                        esac ;;
                    esac
                fi
-               if [ "$HP_ARCH" = "" ]; then
-                   eval "$set_cc_for_build"
+               if test "$HP_ARCH" = ""; then
+                   set_cc_for_build
                    sed 's/^            //' << EOF > "$dummy.c"
 
                #define _HPUX_SOURCE
@@ -694,13 +714,13 @@ EOF
                    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
@@ -722,11 +742,11 @@ EOF
        echo "$HP_ARCH"-hp-hpux"$HPUX_REV"
        exit ;;
     ia64:HP-UX:*:*)
-       HPUX_REV=`echo "$UNAME_RELEASE"|sed -e 's/[^.]*.[0B]*//'`
+       HPUX_REV=$(echo "$UNAME_RELEASE"|sed -e 's/[^.]*.[0B]*//')
        echo ia64-hp-hpux"$HPUX_REV"
        exit ;;
     3050*:HI-UX:*:*)
-       eval "$set_cc_for_build"
+       set_cc_for_build
        sed 's/^        //' << EOF > "$dummy.c"
        #include <unistd.h>
        int
@@ -752,7 +772,7 @@ 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 ;;
@@ -772,7 +792,7 @@ EOF
        echo hppa1.0-hp-osf
        exit ;;
     i*86:OSF1:*:*)
-       if [ -x /usr/sbin/sysversion ] ; then
+       if test -x /usr/sbin/sysversion ; then
            echo "$UNAME_MACHINE"-unknown-osf1mk
        else
            echo "$UNAME_MACHINE"-unknown-osf1
@@ -821,14 +841,14 @@ EOF
        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:*:*)
@@ -840,15 +860,26 @@ EOF
     *:BSD/OS:*:*)
        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 ${UNAME_RELEASE}|sed -e 's/[-(].*//')"-gnueabihf
+       fi
+       exit ;;
     *:FreeBSD:*:*)
-       UNAME_PROCESSOR=`/usr/bin/uname -p`
+       UNAME_PROCESSOR=$(/usr/bin/uname -p)
        case "$UNAME_PROCESSOR" in
            amd64)
                UNAME_PROCESSOR=x86_64 ;;
            i386)
                UNAME_PROCESSOR=i586 ;;
        esac
-       echo "$UNAME_PROCESSOR"-unknown-freebsd"`echo "$UNAME_RELEASE"|sed -e 's/[-(].*//'`"
+       echo "$UNAME_PROCESSOR"-unknown-freebsd"$(echo "$UNAME_RELEASE"|sed -e 's/[-(].*//')"
        exit ;;
     i*:CYGWIN*:*)
        echo "$UNAME_MACHINE"-pc-cygwin
@@ -881,18 +912,18 @@ EOF
        echo "$UNAME_MACHINE"-pc-uwin
        exit ;;
     amd64:CYGWIN*:*:* | x86_64:CYGWIN*:*:*)
-       echo x86_64-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,[-/].*$,,'`-unknown-$LIBC`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 "$UNAME_SYSTEM" | sed 's,^[^/]*/,,' | tr "[:upper:]" "[:lower:]"``echo "$UNAME_RELEASE"|sed -e 's/[-(].*//'`-$LIBC"
+       echo "$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
@@ -905,7 +936,7 @@ EOF
        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 ;;
@@ -922,7 +953,7 @@ EOF
        echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
        exit ;;
     arm*:Linux:*:*)
-       eval "$set_cc_for_build"
+       set_cc_for_build
        if echo __ARM_EABI__ | $CC_FOR_BUILD -E - 2>/dev/null \
            | grep -q __ARM_EABI__
        then
@@ -964,6 +995,9 @@ EOF
     k1om:Linux:*:*)
        echo "$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-"$LIBC"
        exit ;;
@@ -971,23 +1005,51 @@ EOF
        echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
        exit ;;
     mips:Linux:*:* | mips64:Linux:*:*)
-       eval "$set_cc_for_build"
+       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 "$CPU-unknown-linux-$LIBC"; 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-$LIBCABI"; exit; }
        ;;
     mips64el:Linux:*:*)
        echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
@@ -1006,7 +1068,7 @@ EOF
        exit ;;
     parisc:Linux:*:* | hppa:Linux:*:*)
        # Look for CPU level
-       case `grep '^cpu[^a-z]*:' /proc/cpuinfo 2>/dev/null | cut -d' ' -f2` in
+       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" ;;
@@ -1024,7 +1086,7 @@ EOF
     ppcle:Linux:*:*)
        echo powerpcle-unknown-linux-"$LIBC"
        exit ;;
-    riscv32:Linux:*:* | riscv64:Linux:*:*)
+    riscv32:Linux:*:* | riscv32be:Linux:*:* | riscv64:Linux:*:* | riscv64be:Linux:*:*)
        echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
        exit ;;
     s390:Linux:*:* | s390x:Linux:*:*)
@@ -1046,7 +1108,17 @@ EOF
        echo "$UNAME_MACHINE"-dec-linux-"$LIBC"
        exit ;;
     x86_64:Linux:*:*)
-       echo "$UNAME_MACHINE"-pc-linux-"$LIBC"
+       set_cc_for_build
+       LIBCABI=$LIBC
+       if test "$CC_FOR_BUILD" != no_compiler_found; then
+           if (echo '#ifdef __ILP32__'; echo IS_X32; echo '#endif') | \
+               (CCOPTS="" $CC_FOR_BUILD -E - 2>/dev/null) | \
+               grep IS_X32 >/dev/null
+           then
+               LIBCABI="$LIBC"x32
+           fi
+       fi
+       echo "$UNAME_MACHINE"-pc-linux-"$LIBCABI"
        exit ;;
     xtensa*:Linux:*:*)
        echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
@@ -1086,7 +1158,7 @@ EOF
        echo "$UNAME_MACHINE"-pc-msdosdjgpp
        exit ;;
     i*86:*:4.*:*)
-       UNAME_REL=`echo "$UNAME_RELEASE" | sed 's/\/MP$//'`
+       UNAME_REL=$(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"
        else
@@ -1095,19 +1167,19 @@ EOF
        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}${UNAME_VERSION}"
        exit ;;
     i*86:*:3.2:*)
        if test -f /usr/options/cb.name; then
-               UNAME_REL=`sed -n 's/.*Version //p' </usr/options/cb.name`
+               UNAME_REL=$(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
@@ -1157,7 +1229,7 @@ EOF
     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; }
        /bin/uname -p 2>/dev/null | /bin/grep entium >/dev/null \
@@ -1168,7 +1240,7 @@ EOF
     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"$OS_REL"; exit; }
        /bin/uname -p 2>/dev/null | /bin/grep entium >/dev/null \
@@ -1201,7 +1273,7 @@ EOF
        exit ;;
     *:SINIX-*:*:*)
        if uname -p 2>/dev/null >/dev/null ; then
-               UNAME_MACHINE=`(uname -p) 2>/dev/null`
+               UNAME_MACHINE=$( (uname -p) 2>/dev/null)
                echo "$UNAME_MACHINE"-sni-sysv4
        else
                echo ns32k-sni-sysv
@@ -1235,7 +1307,7 @@ EOF
        echo mips-sony-newsos6
        exit ;;
     R[34]000:*System_V*:*:* | R4000:UNIX_SYSV:*:* | R*000:UNIX_SV:*:*)
-       if [ -d /usr/nec ]; then
+       if test -d /usr/nec; then
                echo mips-nec-sysv"$UNAME_RELEASE"
        else
                echo mips-unknown-sysv"$UNAME_RELEASE"
@@ -1283,44 +1355,48 @@ EOF
     *:Rhapsody:*:*)
        echo "$UNAME_MACHINE"-apple-rhapsody"$UNAME_RELEASE"
        exit ;;
+    arm64:Darwin:*:*)
+       echo aarch64-apple-darwin"$UNAME_RELEASE"
+       exit ;;
     *:Darwin:*:*)
-       UNAME_PROCESSOR=`uname -p` || UNAME_PROCESSOR=unknown
-       eval "$set_cc_for_build"
-       if test "$UNAME_PROCESSOR" = unknown ; then
-           UNAME_PROCESSOR=powerpc
+       UNAME_PROCESSOR=$(uname -p)
+       case $UNAME_PROCESSOR in
+           unknown) UNAME_PROCESSOR=powerpc ;;
+       esac
+       if command -v xcode-select > /dev/null 2> /dev/null && \
+               ! xcode-select --print-path > /dev/null 2> /dev/null ; then
+           # Avoid executing cc if there is no toolchain installed as
+           # cc will be a stub that puts up a graphical alert
+           # prompting the user to install developer tools.
+           CC_FOR_BUILD=no_compiler_found
+       else
+           set_cc_for_build
        fi
-       if test "`echo "$UNAME_RELEASE" | sed -e 's/\..*//'`" -le 10 ; then
-           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
-                   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="" $CC_FOR_BUILD -E - 2>/dev/null) | \
-                      grep IS_PPC >/dev/null
-               then
-                   UNAME_PROCESSOR=powerpc
-               fi
+       if test "$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
-           # Avoid executing cc on OS X 10.9, as it ships with a stub
-           # that puts up a graphical alert prompting to install
-           # developer tools.  Any system running Mac OS X 10.7 or
-           # later (Darwin 11 and later) is required to have a 64-bit
-           # processor. This is not true of the ARM version of Darwin
-           # that Apple uses in portable devices.
-           UNAME_PROCESSOR=x86_64
+           # uname -m returns i386 or x86_64
+           UNAME_PROCESSOR=$UNAME_MACHINE
        fi
        echo "$UNAME_PROCESSOR"-apple-darwin"$UNAME_RELEASE"
        exit ;;
     *:procnto*:*:* | *:QNX:[0123456789]*:*)
-       UNAME_PROCESSOR=`uname -p`
+       UNAME_PROCESSOR=$(uname -p)
        if test "$UNAME_PROCESSOR" = x86; then
                UNAME_PROCESSOR=i386
                UNAME_MACHINE=pc
@@ -1358,6 +1434,7 @@ EOF
        # "uname -m" is not consistent, so use $cputype instead. 386
        # is converted to i386 for consistency with other x86
        # operating systems.
+       # shellcheck disable=SC2154
        if test "$cputype" = 386; then
            UNAME_MACHINE=i386
        else
@@ -1387,10 +1464,10 @@ EOF
        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`
+       UNAME_MACHINE=$( (uname -p) 2>/dev/null)
        case "$UNAME_MACHINE" in
            A*) echo alpha-dec-vms ; exit ;;
            I*) echo ia64-dec-vms ; exit ;;
@@ -1400,13 +1477,13 @@ EOF
        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
        exit ;;
-    i*86:AROS:*:*)
-       echo "$UNAME_MACHINE"-pc-aros
+    *:AROS:*:*)
+       echo "$UNAME_MACHINE"-unknown-aros
        exit ;;
     x86_64:VMkernel:*:*)
        echo "$UNAME_MACHINE"-unknown-esx
@@ -1414,8 +1491,148 @@ EOF
     amd64:Isilon\ OneFS:*:*)
        echo x86_64-unknown-onefs
        exit ;;
+    *:Unleashed:*:*)
+       echo "$UNAME_MACHINE"-unknown-unleashed"$UNAME_RELEASE"
+       exit ;;
 esac
 
+# No uname command or uname output not recognized.
+set_cc_for_build
+cat > "$dummy.c" <<EOF
+#ifdef _SEQUENT_
+#include <sys/types.h>
+#include <sys/utsname.h>
+#endif
+#if defined(ultrix) || defined(_ultrix) || defined(__ultrix) || defined(__ultrix__)
+#if defined (vax) || defined (__vax) || defined (__vax__) || defined(mips) || defined(__mips) || defined(__mips__) || defined(MIPS) || defined(__MIPS__)
+#include <signal.h>
+#if defined(_SIZE_T_) || defined(SIGLOST)
+#include <sys/utsname.h>
+#endif
+#endif
+#endif
+main ()
+{
+#if defined (sony)
+#if defined (MIPSEB)
+  /* BFD wants "bsd" instead of "newsos".  Perhaps BFD should be changed,
+     I don't know....  */
+  printf ("mips-sony-bsd\n"); exit (0);
+#else
+#include <sys/param.h>
+  printf ("m68k-sony-newsos%s\n",
+#ifdef NEWSOS4
+  "4"
+#else
+  ""
+#endif
+  ); exit (0);
+#endif
+#endif
+
+#if defined (NeXT)
+#if !defined (__ARCHITECTURE__)
+#define __ARCHITECTURE__ "m68k"
+#endif
+  int version;
+  version=$( (hostinfo | sed -n 's/.*NeXT Mach \([0-9]*\).*/\1/p') 2>/dev/null);
+  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 (UMAXV)
+  printf ("ns32k-encore-sysv\n"); exit (0);
+#else
+#if defined (CMU)
+  printf ("ns32k-encore-mach\n"); exit (0);
+#else
+  printf ("ns32k-encore-bsd\n"); exit (0);
+#endif
+#endif
+#endif
+
+#if defined (__386BSD__)
+  printf ("i386-pc-bsd\n"); exit (0);
+#endif
+
+#if defined (sequent)
+#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);
+#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
+#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)
+  printf ("i860-alliant-bsd\n"); exit (0);
+#endif
+
+  exit (1);
+}
+EOF
+
+$CC_FOR_BUILD -o "$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; }
+
 echo "$0: unable to guess system type" >&2
 
 case "$UNAME_MACHINE:$UNAME_SYSTEM" in
@@ -1435,9 +1652,15 @@ 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:
 
-  https://git.savannah.gnu.org/gitweb/?p=config.git;a=blob_plain;f=config.guess
+  https://git.savannah.gnu.org/cgit/config.git/plain/config.guess
 and
-  https://git.savannah.gnu.org/gitweb/?p=config.git;a=blob_plain;f=config.sub
+  https://git.savannah.gnu.org/cgit/config.git/plain/config.sub
+EOF
+
+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 config-patches@gnu.org to
@@ -1445,26 +1668,27 @@ provide the necessary information to handle your system.
 
 config.guess timestamp = $timestamp
 
-uname -m = `(uname -m) 2>/dev/null || echo unknown`
-uname -r = `(uname -r) 2>/dev/null || echo unknown`
-uname -s = `(uname -s) 2>/dev/null || echo unknown`
-uname -v = `(uname -v) 2>/dev/null || echo unknown`
+uname -m = $( (uname -m) 2>/dev/null || echo unknown)
+uname -r = $( (uname -r) 2>/dev/null || echo unknown)
+uname -s = $( (uname -s) 2>/dev/null || echo unknown)
+uname -v = $( (uname -v) 2>/dev/null || echo unknown)
 
-/usr/bin/uname -p = `(/usr/bin/uname -p) 2>/dev/null`
-/bin/uname -X     = `(/bin/uname -X) 2>/dev/null`
+/usr/bin/uname -p = $( (/usr/bin/uname -p) 2>/dev/null)
+/bin/uname -X     = $( (/bin/uname -X) 2>/dev/null)
 
-hostinfo               = `(hostinfo) 2>/dev/null`
-/bin/universe          = `(/bin/universe) 2>/dev/null`
-/usr/bin/arch -k       = `(/usr/bin/arch -k) 2>/dev/null`
-/bin/arch              = `(/bin/arch) 2>/dev/null`
-/usr/bin/oslevel       = `(/usr/bin/oslevel) 2>/dev/null`
-/usr/convex/getsysinfo = `(/usr/convex/getsysinfo) 2>/dev/null`
+hostinfo               = $( (hostinfo) 2>/dev/null)
+/bin/universe          = $( (/bin/universe) 2>/dev/null)
+/usr/bin/arch -k       = $( (/usr/bin/arch -k) 2>/dev/null)
+/bin/arch              = $( (/bin/arch) 2>/dev/null)
+/usr/bin/oslevel       = $( (/usr/bin/oslevel) 2>/dev/null)
+/usr/convex/getsysinfo = $( (/usr/convex/getsysinfo) 2>/dev/null)
 
 UNAME_MACHINE = "$UNAME_MACHINE"
 UNAME_RELEASE = "$UNAME_RELEASE"
 UNAME_SYSTEM  = "$UNAME_SYSTEM"
 UNAME_VERSION = "$UNAME_VERSION"
 EOF
+fi
 
 exit 1