]> ncurses.scripts.mit.edu Git - ncurses.git/blobdiff - config.sub
ncurses 6.4 - patch 20240414
[ncurses.git] / config.sub
index 46708056af382d6b4244f44ff5ee1441721dbd5d..e4c4e09b6540ab06c90b3e8bdc75b92d28b77867 100755 (executable)
@@ -1,12 +1,14 @@
 #! /bin/sh
 # Configuration validation subroutine script.
-#   Copyright 1992-2018 Free Software Foundation, Inc.
+#   Copyright 1992-2023 Free Software Foundation, Inc.
 
-timestamp='2018-11-28'
+# shellcheck disable=SC2006,SC2268 # see below for rationale
+
+timestamp='2023-12-02'
 
 # 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 3 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
@@ -33,7 +35,7 @@ timestamp='2018-11-28'
 # Otherwise, we print the canonical config type on stdout and succeed.
 
 # You can get the latest version of this script from:
-# 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
 
 # This file is supposed to be the same for all GNU packages
 # and recognize all the CPU types, system types and aliases
@@ -50,6 +52,13 @@ timestamp='2018-11-28'
 #      CPU_TYPE-MANUFACTURER-KERNEL-OPERATING_SYSTEM
 # It is wrong to echo any other type of specification.
 
+# The "shellcheck disable" line above the timestamp inhibits complaints
+# about features and limitations of the classic Bourne shell that were
+# superseded or lifted in POSIX.  However, this script identifies a wide
+# variety of pre-POSIX systems that do not have POSIX shells at all, and
+# even some reasonably current systems (Solaris 10 as case-in-point) still
+# have a pre-POSIX /bin/sh.
+
 me=`echo "$0" | sed -e 's,.*/,,'`
 
 usage="\
@@ -67,13 +76,13 @@ Report bugs and patches to <config-patches@gnu.org>."
 version="\
 GNU config.sub ($timestamp)
 
-Copyright 1992-2018 Free Software Foundation, Inc.
+Copyright 1992-2023 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 \`$me --help' for more information."
+Try '$me --help' for more information."
 
 # Parse command line
 while test $# -gt 0 ; do
@@ -111,40 +120,43 @@ case $# in
 esac
 
 # Split fields of configuration type
-IFS="-" read -r field1 field2 field3 field4 <<EOF
+# shellcheck disable=SC2162
+saved_IFS=$IFS
+IFS="-" read field1 field2 field3 field4 <<EOF
 $1
 EOF
+IFS=$saved_IFS
 
 # Separate into logical components for further validation
 case $1 in
        *-*-*-*-*)
-               echo Invalid configuration \`"$1"\': more than four components >&2
+               echo "Invalid configuration '$1': more than four components" >&2
                exit 1
                ;;
        *-*-*-*)
                basic_machine=$field1-$field2
-               os=$field3-$field4
+               basic_os=$field3-$field4
                ;;
        *-*-*)
                # Ambiguous whether COMPANY is present, or skipped and KERNEL-OS is two
                # parts
                maybe_os=$field2-$field3
                case $maybe_os in
-                       nto-qnx* | linux-gnu* | linux-android* | linux-dietlibc \
-                       | linux-newlib* | linux-musl* | linux-uclibc* | uclinux-uclibc* \
+                       nto-qnx* | linux-* | uclinux-uclibc* \
                        | uclinux-gnu* | kfreebsd*-gnu* | knetbsd*-gnu* | netbsd*-gnu* \
                        | netbsd*-eabi* | kopensolaris*-gnu* | cloudabi*-eabi* \
-                       | storm-chaos* | os2-emx* | rtmk-nova*)
+                       | storm-chaos* | os2-emx* | rtmk-nova* | managarm-* \
+                       | windows-* )
                                basic_machine=$field1
-                               os=$maybe_os
+                               basic_os=$maybe_os
                                ;;
                        android-linux)
                                basic_machine=$field1-unknown
-                               os=linux-android
+                               basic_os=linux-android
                                ;;
                        *)
                                basic_machine=$field1-$field2
-                               os=$field3
+                               basic_os=$field3
                                ;;
                esac
                ;;
@@ -153,7 +165,7 @@ case $1 in
                case $field1-$field2 in
                        decstation-3100)
                                basic_machine=mips-dec
-                               os=
+                               basic_os=
                                ;;
                        *-*)
                                # Second component is usually, but not always the OS
@@ -161,7 +173,11 @@ case $1 in
                                        # Prevent following clause from handling this valid os
                                        sun*os*)
                                                basic_machine=$field1
-                                               os=$field2
+                                               basic_os=$field2
+                                               ;;
+                                       zephyr*)
+                                               basic_machine=$field1-unknown
+                                               basic_os=$field2
                                                ;;
                                        # Manufacturers
                                        dec* | mips* | sequent* | encore* | pc533* | sgi* | sony* \
@@ -174,11 +190,11 @@ case $1 in
                                        | microblaze* | sim | cisco \
                                        | oki | wec | wrs | winbond)
                                                basic_machine=$field1-$field2
-                                               os=
+                                               basic_os=
                                                ;;
                                        *)
                                                basic_machine=$field1
-                                               os=$field2
+                                               basic_os=$field2
                                                ;;
                                esac
                        ;;
@@ -190,450 +206,451 @@ case $1 in
                case $field1 in
                        386bsd)
                                basic_machine=i386-pc
-                               os=bsd
+                               basic_os=bsd
                                ;;
                        a29khif)
                                basic_machine=a29k-amd
-                               os=udi
+                               basic_os=udi
                                ;;
                        adobe68k)
                                basic_machine=m68010-adobe
-                               os=scout
+                               basic_os=scout
                                ;;
                        alliant)
                                basic_machine=fx80-alliant
-                               os=
+                               basic_os=
                                ;;
                        altos | altos3068)
                                basic_machine=m68k-altos
-                               os=
+                               basic_os=
                                ;;
                        am29k)
                                basic_machine=a29k-none
-                               os=bsd
+                               basic_os=bsd
                                ;;
                        amdahl)
                                basic_machine=580-amdahl
-                               os=sysv
+                               basic_os=sysv
                                ;;
                        amiga)
                                basic_machine=m68k-unknown
-                               os=
+                               basic_os=
                                ;;
                        amigaos | amigados)
                                basic_machine=m68k-unknown
-                               os=amigaos
+                               basic_os=amigaos
                                ;;
                        amigaunix | amix)
                                basic_machine=m68k-unknown
-                               os=sysv4
+                               basic_os=sysv4
                                ;;
                        apollo68)
                                basic_machine=m68k-apollo
-                               os=sysv
+                               basic_os=sysv
                                ;;
                        apollo68bsd)
                                basic_machine=m68k-apollo
-                               os=bsd
+                               basic_os=bsd
                                ;;
                        aros)
                                basic_machine=i386-pc
-                               os=aros
+                               basic_os=aros
                                ;;
                        aux)
                                basic_machine=m68k-apple
-                               os=aux
+                               basic_os=aux
                                ;;
                        balance)
                                basic_machine=ns32k-sequent
-                               os=dynix
+                               basic_os=dynix
                                ;;
                        blackfin)
                                basic_machine=bfin-unknown
-                               os=linux
+                               basic_os=linux
                                ;;
                        cegcc)
                                basic_machine=arm-unknown
-                               os=cegcc
+                               basic_os=cegcc
                                ;;
                        convex-c1)
                                basic_machine=c1-convex
-                               os=bsd
+                               basic_os=bsd
                                ;;
                        convex-c2)
                                basic_machine=c2-convex
-                               os=bsd
+                               basic_os=bsd
                                ;;
                        convex-c32)
                                basic_machine=c32-convex
-                               os=bsd
+                               basic_os=bsd
                                ;;
                        convex-c34)
                                basic_machine=c34-convex
-                               os=bsd
+                               basic_os=bsd
                                ;;
                        convex-c38)
                                basic_machine=c38-convex
-                               os=bsd
+                               basic_os=bsd
                                ;;
                        cray)
                                basic_machine=j90-cray
-                               os=unicos
+                               basic_os=unicos
                                ;;
                        crds | unos)
                                basic_machine=m68k-crds
-                               os=
+                               basic_os=
                                ;;
                        da30)
                                basic_machine=m68k-da30
-                               os=
+                               basic_os=
                                ;;
                        decstation | pmax | pmin | dec3100 | decstatn)
                                basic_machine=mips-dec
-                               os=
+                               basic_os=
                                ;;
                        delta88)
                                basic_machine=m88k-motorola
-                               os=sysv3
+                               basic_os=sysv3
                                ;;
                        dicos)
                                basic_machine=i686-pc
-                               os=dicos
+                               basic_os=dicos
                                ;;
                        djgpp)
                                basic_machine=i586-pc
-                               os=msdosdjgpp
+                               basic_os=msdosdjgpp
                                ;;
                        ebmon29k)
                                basic_machine=a29k-amd
-                               os=ebmon
+                               basic_os=ebmon
                                ;;
                        es1800 | OSE68k | ose68k | ose | OSE)
                                basic_machine=m68k-ericsson
-                               os=ose
+                               basic_os=ose
                                ;;
                        gmicro)
                                basic_machine=tron-gmicro
-                               os=sysv
+                               basic_os=sysv
                                ;;
                        go32)
                                basic_machine=i386-pc
-                               os=go32
+                               basic_os=go32
                                ;;
                        h8300hms)
                                basic_machine=h8300-hitachi
-                               os=hms
+                               basic_os=hms
                                ;;
                        h8300xray)
                                basic_machine=h8300-hitachi
-                               os=xray
+                               basic_os=xray
                                ;;
                        h8500hms)
                                basic_machine=h8500-hitachi
-                               os=hms
+                               basic_os=hms
                                ;;
                        harris)
                                basic_machine=m88k-harris
-                               os=sysv3
+                               basic_os=sysv3
                                ;;
-                       hp300)
+                       hp300 | hp300hpux)
                                basic_machine=m68k-hp
+                               basic_os=hpux
                                ;;
                        hp300bsd)
                                basic_machine=m68k-hp
-                               os=bsd
-                               ;;
-                       hp300hpux)
-                               basic_machine=m68k-hp
-                               os=hpux
+                               basic_os=bsd
                                ;;
                        hppaosf)
                                basic_machine=hppa1.1-hp
-                               os=osf
+                               basic_os=osf
                                ;;
                        hppro)
                                basic_machine=hppa1.1-hp
-                               os=proelf
+                               basic_os=proelf
                                ;;
                        i386mach)
                                basic_machine=i386-mach
-                               os=mach
-                               ;;
-                       vsta)
-                               basic_machine=i386-pc
-                               os=vsta
+                               basic_os=mach
                                ;;
                        isi68 | isi)
                                basic_machine=m68k-isi
-                               os=sysv
+                               basic_os=sysv
                                ;;
                        m68knommu)
                                basic_machine=m68k-unknown
-                               os=linux
+                               basic_os=linux
                                ;;
                        magnum | m3230)
                                basic_machine=mips-mips
-                               os=sysv
+                               basic_os=sysv
                                ;;
                        merlin)
                                basic_machine=ns32k-utek
-                               os=sysv
+                               basic_os=sysv
                                ;;
                        mingw64)
                                basic_machine=x86_64-pc
-                               os=mingw64
+                               basic_os=mingw64
                                ;;
                        mingw32)
                                basic_machine=i686-pc
-                               os=mingw32
+                               basic_os=mingw32
                                ;;
                        mingw32ce)
                                basic_machine=arm-unknown
-                               os=mingw32ce
+                               basic_os=mingw32ce
                                ;;
                        monitor)
                                basic_machine=m68k-rom68k
-                               os=coff
+                               basic_os=coff
                                ;;
                        morphos)
                                basic_machine=powerpc-unknown
-                               os=morphos
+                               basic_os=morphos
                                ;;
                        moxiebox)
                                basic_machine=moxie-unknown
-                               os=moxiebox
+                               basic_os=moxiebox
                                ;;
                        msdos)
                                basic_machine=i386-pc
-                               os=msdos
+                               basic_os=msdos
                                ;;
                        msys)
                                basic_machine=i686-pc
-                               os=msys
+                               basic_os=msys
                                ;;
                        mvs)
                                basic_machine=i370-ibm
-                               os=mvs
+                               basic_os=mvs
                                ;;
                        nacl)
                                basic_machine=le32-unknown
-                               os=nacl
+                               basic_os=nacl
                                ;;
                        ncr3000)
                                basic_machine=i486-ncr
-                               os=sysv4
+                               basic_os=sysv4
                                ;;
                        netbsd386)
                                basic_machine=i386-pc
-                               os=netbsd
+                               basic_os=netbsd
                                ;;
                        netwinder)
                                basic_machine=armv4l-rebel
-                               os=linux
+                               basic_os=linux
                                ;;
                        news | news700 | news800 | news900)
                                basic_machine=m68k-sony
-                               os=newsos
+                               basic_os=newsos
                                ;;
                        news1000)
                                basic_machine=m68030-sony
-                               os=newsos
+                               basic_os=newsos
                                ;;
                        necv70)
                                basic_machine=v70-nec
-                               os=sysv
+                               basic_os=sysv
                                ;;
                        nh3000)
                                basic_machine=m68k-harris
-                               os=cxux
+                               basic_os=cxux
                                ;;
                        nh[45]000)
                                basic_machine=m88k-harris
-                               os=cxux
+                               basic_os=cxux
                                ;;
                        nindy960)
                                basic_machine=i960-intel
-                               os=nindy
+                               basic_os=nindy
                                ;;
                        mon960)
                                basic_machine=i960-intel
-                               os=mon960
+                               basic_os=mon960
                                ;;
                        nonstopux)
                                basic_machine=mips-compaq
-                               os=nonstopux
+                               basic_os=nonstopux
                                ;;
                        os400)
                                basic_machine=powerpc-ibm
-                               os=os400
+                               basic_os=os400
                                ;;
                        OSE68000 | ose68000)
                                basic_machine=m68000-ericsson
-                               os=ose
+                               basic_os=ose
                                ;;
                        os68k)
                                basic_machine=m68k-none
-                               os=os68k
+                               basic_os=os68k
                                ;;
                        paragon)
                                basic_machine=i860-intel
-                               os=osf
+                               basic_os=osf
                                ;;
                        parisc)
                                basic_machine=hppa-unknown
-                               os=linux
+                               basic_os=linux
+                               ;;
+                       psp)
+                               basic_machine=mipsallegrexel-sony
+                               basic_os=psp
                                ;;
                        pw32)
                                basic_machine=i586-unknown
-                               os=pw32
+                               basic_os=pw32
                                ;;
                        rdos | rdos64)
                                basic_machine=x86_64-pc
-                               os=rdos
+                               basic_os=rdos
                                ;;
                        rdos32)
                                basic_machine=i386-pc
-                               os=rdos
+                               basic_os=rdos
                                ;;
                        rom68k)
                                basic_machine=m68k-rom68k
-                               os=coff
+                               basic_os=coff
                                ;;
                        sa29200)
                                basic_machine=a29k-amd
-                               os=udi
+                               basic_os=udi
                                ;;
                        sei)
                                basic_machine=mips-sei
-                               os=seiux
+                               basic_os=seiux
                                ;;
                        sequent)
                                basic_machine=i386-sequent
-                               os=
+                               basic_os=
                                ;;
                        sps7)
                                basic_machine=m68k-bull
-                               os=sysv2
+                               basic_os=sysv2
                                ;;
                        st2000)
                                basic_machine=m68k-tandem
-                               os=
+                               basic_os=
                                ;;
                        stratus)
                                basic_machine=i860-stratus
-                               os=sysv4
+                               basic_os=sysv4
                                ;;
                        sun2)
                                basic_machine=m68000-sun
-                               os=
+                               basic_os=
                                ;;
                        sun2os3)
                                basic_machine=m68000-sun
-                               os=sunos3
+                               basic_os=sunos3
                                ;;
                        sun2os4)
                                basic_machine=m68000-sun
-                               os=sunos4
+                               basic_os=sunos4
                                ;;
                        sun3)
                                basic_machine=m68k-sun
-                               os=
+                               basic_os=
                                ;;
                        sun3os3)
                                basic_machine=m68k-sun
-                               os=sunos3
+                               basic_os=sunos3
                                ;;
                        sun3os4)
                                basic_machine=m68k-sun
-                               os=sunos4
+                               basic_os=sunos4
                                ;;
                        sun4)
                                basic_machine=sparc-sun
-                               os=
+                               basic_os=
                                ;;
                        sun4os3)
                                basic_machine=sparc-sun
-                               os=sunos3
+                               basic_os=sunos3
                                ;;
                        sun4os4)
                                basic_machine=sparc-sun
-                               os=sunos4
+                               basic_os=sunos4
                                ;;
                        sun4sol2)
                                basic_machine=sparc-sun
-                               os=solaris2
+                               basic_os=solaris2
                                ;;
                        sun386 | sun386i | roadrunner)
                                basic_machine=i386-sun
-                               os=
+                               basic_os=
                                ;;
                        sv1)
                                basic_machine=sv1-cray
-                               os=unicos
+                               basic_os=unicos
                                ;;
                        symmetry)
                                basic_machine=i386-sequent
-                               os=dynix
+                               basic_os=dynix
                                ;;
                        t3e)
                                basic_machine=alphaev5-cray
-                               os=unicos
+                               basic_os=unicos
                                ;;
                        t90)
                                basic_machine=t90-cray
-                               os=unicos
+                               basic_os=unicos
                                ;;
                        toad1)
                                basic_machine=pdp10-xkl
-                               os=tops20
+                               basic_os=tops20
                                ;;
                        tpf)
                                basic_machine=s390x-ibm
-                               os=tpf
+                               basic_os=tpf
                                ;;
                        udi29k)
                                basic_machine=a29k-amd
-                               os=udi
+                               basic_os=udi
                                ;;
                        ultra3)
                                basic_machine=a29k-nyu
-                               os=sym1
+                               basic_os=sym1
                                ;;
                        v810 | necv810)
                                basic_machine=v810-nec
-                               os=none
+                               basic_os=none
                                ;;
                        vaxv)
                                basic_machine=vax-dec
-                               os=sysv
+                               basic_os=sysv
                                ;;
                        vms)
                                basic_machine=vax-dec
-                               os=vms
+                               basic_os=vms
+                               ;;
+                       vsta)
+                               basic_machine=i386-pc
+                               basic_os=vsta
                                ;;
                        vxworks960)
                                basic_machine=i960-wrs
-                               os=vxworks
+                               basic_os=vxworks
                                ;;
                        vxworks68)
                                basic_machine=m68k-wrs
-                               os=vxworks
+                               basic_os=vxworks
                                ;;
                        vxworks29k)
                                basic_machine=a29k-wrs
-                               os=vxworks
+                               basic_os=vxworks
                                ;;
                        xbox)
                                basic_machine=i686-pc
-                               os=mingw32
+                               basic_os=mingw32
                                ;;
                        ymp)
                                basic_machine=ymp-cray
-                               os=unicos
+                               basic_os=unicos
                                ;;
                        *)
                                basic_machine=$1
-                               os=
+                               basic_os=
                                ;;
                esac
                ;;
@@ -685,17 +702,17 @@ case $basic_machine in
        bluegene*)
                cpu=powerpc
                vendor=ibm
-               os=cnk
+               basic_os=cnk
                ;;
        decsystem10* | dec10*)
                cpu=pdp10
                vendor=dec
-               os=tops10
+               basic_os=tops10
                ;;
        decsystem20* | dec20*)
                cpu=pdp10
                vendor=dec
-               os=tops20
+               basic_os=tops20
                ;;
        delta | 3300 | motorola-3300 | motorola-delta \
              | 3300-motorola | delta-motorola)
@@ -705,7 +722,7 @@ case $basic_machine in
        dpx2*)
                cpu=m68k
                vendor=bull
-               os=sysv3
+               basic_os=sysv3
                ;;
        encore | umax | mmax)
                cpu=ns32k
@@ -714,7 +731,7 @@ case $basic_machine in
        elxsi)
                cpu=elxsi
                vendor=elxsi
-               os=${os:-bsd}
+               basic_os=${basic_os:-bsd}
                ;;
        fx2800)
                cpu=i860
@@ -727,7 +744,7 @@ case $basic_machine in
        h3050r* | hiux*)
                cpu=hppa1.1
                vendor=hitachi
-               os=hiuxwe2
+               basic_os=hiuxwe2
                ;;
        hp3k9[0-9][0-9] | hp9[0-9][0-9])
                cpu=hppa1.0
@@ -770,36 +787,36 @@ case $basic_machine in
        i*86v32)
                cpu=`echo "$1" | sed -e 's/86.*/86/'`
                vendor=pc
-               os=sysv32
+               basic_os=sysv32
                ;;
        i*86v4*)
                cpu=`echo "$1" | sed -e 's/86.*/86/'`
                vendor=pc
-               os=sysv4
+               basic_os=sysv4
                ;;
        i*86v)
                cpu=`echo "$1" | sed -e 's/86.*/86/'`
                vendor=pc
-               os=sysv
+               basic_os=sysv
                ;;
        i*86sol2)
                cpu=`echo "$1" | sed -e 's/86.*/86/'`
                vendor=pc
-               os=solaris2
+               basic_os=solaris2
                ;;
        j90 | j90-cray)
                cpu=j90
                vendor=cray
-               os=${os:-unicos}
+               basic_os=${basic_os:-unicos}
                ;;
        iris | iris4d)
                cpu=mips
                vendor=sgi
-               case $os in
+               case $basic_os in
                    irix*)
                        ;;
                    *)
-                       os=irix4
+                       basic_os=irix4
                        ;;
                esac
                ;;
@@ -810,24 +827,26 @@ case $basic_machine in
        *mint | mint[0-9]* | *MiNT | *MiNT[0-9]*)
                cpu=m68k
                vendor=atari
-               os=mint
+               basic_os=mint
                ;;
        news-3600 | risc-news)
                cpu=mips
                vendor=sony
-               os=newsos
+               basic_os=newsos
                ;;
        next | m*-next)
                cpu=m68k
                vendor=next
-               case $os in
-                   nextstep* )
+               case $basic_os in
+                   openstep*)
+                       ;;
+                   nextstep*)
                        ;;
                    ns2*)
-                     os=nextstep2
+                     basic_os=nextstep2
                        ;;
                    *)
-                     os=nextstep3
+                     basic_os=nextstep3
                        ;;
                esac
                ;;
@@ -838,12 +857,12 @@ case $basic_machine in
        op50n-* | op60c-*)
                cpu=hppa1.1
                vendor=oki
-               os=proelf
+               basic_os=proelf
                ;;
        pa-hitachi)
                cpu=hppa1.1
                vendor=hitachi
-               os=hiuxwe2
+               basic_os=hiuxwe2
                ;;
        pbd)
                cpu=sparc
@@ -880,12 +899,12 @@ case $basic_machine in
        sde)
                cpu=mipsisa32
                vendor=sde
-               os=${os:-elf}
+               basic_os=${basic_os:-elf}
                ;;
        simso-wrs)
                cpu=sparclite
                vendor=wrs
-               os=vxworks
+               basic_os=vxworks
                ;;
        tower | tower-32)
                cpu=m68k
@@ -902,7 +921,7 @@ case $basic_machine in
        w89k-*)
                cpu=hppa1.1
                vendor=winbond
-               os=proelf
+               basic_os=proelf
                ;;
        none)
                cpu=none
@@ -918,11 +937,14 @@ case $basic_machine in
                ;;
 
        *-*)
-               IFS="-" read -r cpu vendor <<EOF
+               # shellcheck disable=SC2162
+               saved_IFS=$IFS
+               IFS="-" read cpu vendor <<EOF
 $basic_machine
 EOF
+               IFS=$saved_IFS
                ;;
-       # We use `pc' rather than `unknown'
+       # We use 'pc' rather than 'unknown'
        # because (1) that's what they normally are, and
        # (2) the word "unknown" tends to confuse beginning users.
        i*86 | x86_64)
@@ -954,11 +976,11 @@ case $cpu-$vendor in
        # some cases the only manufacturer, in others, it is the most popular.
        craynv-unknown)
                vendor=cray
-               os=${os:-unicosmp}
+               basic_os=${basic_os:-unicosmp}
                ;;
        c90-unknown | c90-cray)
                vendor=cray
-               os=${os:-unicos}
+               basic_os=${Basic_os:-unicos}
                ;;
        fx80-unknown)
                vendor=alliant
@@ -999,10 +1021,15 @@ case $cpu-$vendor in
                ;;
 
        # Here we normalize CPU types with a missing or matching vendor
+       armh-unknown | armh-alt)
+               cpu=armv7l
+               vendor=alt
+               basic_os=${basic_os:-linux-gnueabihf}
+               ;;
        dpx20-unknown | dpx20-bull)
                cpu=rs6000
                vendor=bull
-               os=${os:-bosx}
+               basic_os=${basic_os:-bosx}
                ;;
 
        # Here we normalize CPU types irrespective of the vendor
@@ -1011,7 +1038,7 @@ case $cpu-$vendor in
                ;;
        blackfin-*)
                cpu=bfin
-               os=linux
+               basic_os=linux
                ;;
        c54x-*)
                cpu=tic54x
@@ -1024,7 +1051,7 @@ case $cpu-$vendor in
                ;;
        e500v[12]-*)
                cpu=powerpc
-               os=$os"spe"
+               basic_os=${basic_os}"spe"
                ;;
        mips3*-*)
                cpu=mips64
@@ -1034,7 +1061,7 @@ case $cpu-$vendor in
                ;;
        m68knommu-*)
                cpu=m68k
-               os=linux
+               basic_os=linux
                ;;
        m9s12z-* | m68hcs12z-* | hcs12z-* | s12z-*)
                cpu=s12z
@@ -1044,12 +1071,12 @@ case $cpu-$vendor in
                ;;
        parisc-*)
                cpu=hppa
-               os=linux
+               basic_os=linux
                ;;
        pentium-* | p5-* | k5-* | k6-* | nexgen-* | viac3-*)
                cpu=i586
                ;;
-       pentiumpro-* | p6-* | 6x86-* | athlon-* | athalon_*-*)
+       pentiumpro-* | p6-* | 6x86-* | athlon-* | athlon_*-*)
                cpu=i686
                ;;
        pentiumii-* | pentium2-* | pentiumiii-* | pentium3-*)
@@ -1100,11 +1127,14 @@ case $cpu-$vendor in
        xscale-* | xscalee[bl]-*)
                cpu=`echo "$cpu" | sed 's/^xscale/arm/'`
                ;;
+       arm64-* | aarch64le-*)
+               cpu=aarch64
+               ;;
 
        # Recognize the canonical CPU Types that limit and/or modify the
        # company names they are paired with.
        cr16-*)
-               os=${os:-elf}
+               basic_os=${basic_os:-elf}
                ;;
        crisv32-* | etraxfs*-*)
                cpu=crisv32
@@ -1115,7 +1145,7 @@ case $cpu-$vendor in
                vendor=axis
                ;;
        crx-*)
-               os=${os:-elf}
+               basic_os=${basic_os:-elf}
                ;;
        neo-tandem)
                cpu=neo
@@ -1137,16 +1167,12 @@ case $cpu-$vendor in
                cpu=nsx
                vendor=tandem
                ;;
-       s390-*)
-               cpu=s390
-               vendor=ibm
-               ;;
-       s390x-*)
-               cpu=s390x
-               vendor=ibm
+       mipsallegrexel-sony)
+               cpu=mipsallegrexel
+               vendor=sony
                ;;
        tile*-*)
-               os=${os:-linux-gnu}
+               basic_os=${basic_os:-linux-gnu}
                ;;
 
        *)
@@ -1155,93 +1181,83 @@ case $cpu-$vendor in
                case $cpu in
                        1750a | 580 \
                        | a29k \
-                       | aarch64 | aarch64_be \
+                       | aarch64 | aarch64_be | aarch64c | arm64ec \
                        | abacus \
                        | alpha | alphaev[4-8] | alphaev56 | alphaev6[78] \
                        | alpha64 | alpha64ev[4-8] | alpha64ev56 | alpha64ev6[78] \
                        | alphapca5[67] | alpha64pca5[67] \
                        | am33_2.0 \
                        | amdgcn \
-                       | arc | arceb \
-                       | arm  | arm[lb]e | arme[lb] | armv* \
+                       | arc | arceb | arc32 | arc64 \
+                       | arm | arm[lb]e | arme[lb] | armv* \
                        | avr | avr32 \
                        | asmjs \
                        | ba \
                        | be32 | be64 \
-                       | bfin | bs2000 \
+                       | bfin | bpf | bs2000 \
                        | c[123]* | c30 | [cjt]90 | c4x \
                        | c8051 | clipper | craynv | csky | cydra \
                        | d10v | d30v | dlx | dsp16xx \
                        | e2k | elxsi | epiphany \
                        | f30[01] | f700 | fido | fr30 | frv | ft32 | fx80 \
+                       | javascript \
                        | h8300 | h8500 \
                        | hppa | hppa1.[01] | hppa2.0 | hppa2.0[nw] | hppa64 \
                        | hexagon \
                        | i370 | i*86 | i860 | i960 | ia16 | ia64 \
                        | ip2k | iq2000 \
                        | k1om \
+                       | kvx \
                        | le32 | le64 \
                        | lm32 \
+                       | loongarch32 | loongarch64 \
                        | m32c | m32r | m32rle \
-                       | m5200 | m68000 | m680[012346]0 | m68360 | m683?2 | m68k | v70 | w65 \
-                       | m6811 | m68hc11 | m6812 | m68hc12 | m68hcs12x | nvptx | picochip \
+                       | m5200 | m68000 | m680[012346]0 | m68360 | m683?2 | m68k \
+                       | m6811 | m68hc11 | m6812 | m68hc12 | m68hcs12x \
                        | m88110 | m88k | maxq | mb | mcore | mep | metag \
                        | microblaze | microblazeel \
-                       | mips | mipsbe | mipseb | mipsel | mipsle \
-                       | mips16 \
-                       | mips64 | mips64el \
-                       | mips64octeon | mips64octeonel \
-                       | mips64orion | mips64orionel \
-                       | mips64r5900 | mips64r5900el \
-                       | mips64vr | mips64vrel \
-                       | mips64vr4100 | mips64vr4100el \
-                       | mips64vr4300 | mips64vr4300el \
-                       | mips64vr5000 | mips64vr5000el \
-                       | mips64vr5900 | mips64vr5900el \
-                       | mipsisa32 | mipsisa32el \
-                       | mipsisa32r2 | mipsisa32r2el \
-                       | mipsisa32r6 | mipsisa32r6el \
-                       | mipsisa64 | mipsisa64el \
-                       | mipsisa64r2 | mipsisa64r2el \
-                       | mipsisa64r6 | mipsisa64r6el \
-                       | mipsisa64sb1 | mipsisa64sb1el \
-                       | mipsisa64sr71k | mipsisa64sr71kel \
-                       | mipsr5900 | mipsr5900el \
-                       | mipstx39 | mipstx39el \
+                       | mips* \
                        | mmix \
                        | mn10200 | mn10300 \
                        | moxie \
                        | mt \
                        | msp430 \
+                       | nanomips* \
                        | nds32 | nds32le | nds32be \
                        | nfp \
                        | nios | nios2 | nios2eb | nios2el \
-                       | none | np1 | ns16k | ns32k \
+                       | none | np1 | ns16k | ns32k | nvptx \
                        | open8 \
                        | or1k* \
                        | or32 \
                        | orion \
+                       | picochip \
                        | pdp10 | pdp11 | pj | pjl | pn | power \
                        | powerpc | powerpc64 | powerpc64le | powerpcle | powerpcspe \
                        | pru \
                        | pyramid \
-                       | riscv | riscv32 | riscv64 \
+                       | riscv | riscv32 | riscv32be | riscv64 | riscv64be \
                        | rl78 | romp | rs6000 | rx \
+                       | s390 | s390x \
                        | score \
-                       | sh | sh[1234] | sh[24]a | sh[24]ae[lb] | sh[23]e | she[lb] | sh[lb]e \
+                       | sh | shl \
+                       | sh[1234] | sh[24]a | sh[24]ae[lb] | sh[23]e | she[lb] | sh[lb]e \
                        | sh[1234]e[lb] |  sh[12345][lb]e | sh[23]ele | sh64 | sh64le \
                        | sparc | sparc64 | sparc64b | sparc64v | sparc86x | sparclet \
                        | sparclite \
                        | sparcv8 | sparcv9 | sparcv9b | sparcv9v | sv1 | sx* \
                        | spu \
                        | tahoe \
+                       | thumbv7* \
                        | tic30 | tic4x | tic54x | tic55x | tic6x | tic80 \
                        | tron \
                        | ubicom32 \
-                       | v850 | v850e | v850e1 | v850es | v850e2 | v850e2v3 \
+                       | v70 | v850 | v850e | v850e1 | v850es | v850e2 | v850e2v3 \
                        | vax \
+                       | vc4 \
                        | visium \
-                       | wasm32 \
+                       | w65 \
+                       | wasm32 | wasm64 \
                        | we32k \
                        | x86 | x86_64 | xc16x | xgate | xps100 \
                        | xstormy16 | xtensa* \
@@ -1250,7 +1266,7 @@ case $cpu-$vendor in
                                ;;
 
                        *)
-                               echo Invalid configuration \`"$1"\': machine \`"$cpu-$vendor"\' not recognized 1>&2
+                               echo "Invalid configuration '$1': machine '$cpu-$vendor' not recognized" 1>&2
                                exit 1
                                ;;
                esac
@@ -1271,8 +1287,54 @@ esac
 
 # Decode manufacturer-specific aliases for certain operating systems.
 
-if [ x$os != x ]
+if test x"$basic_os" != x
 then
+
+# First recognize some ad-hoc cases, or perhaps split kernel-os, or else just
+# set os.
+obj=
+case $basic_os in
+       gnu/linux*)
+               kernel=linux
+               os=`echo "$basic_os" | sed -e 's|gnu/linux|gnu|'`
+               ;;
+       os2-emx)
+               kernel=os2
+               os=`echo "$basic_os" | sed -e 's|os2-emx|emx|'`
+               ;;
+       nto-qnx*)
+               kernel=nto
+               os=`echo "$basic_os" | sed -e 's|nto-qnx|qnx|'`
+               ;;
+       *-*)
+               # shellcheck disable=SC2162
+               saved_IFS=$IFS
+               IFS="-" read kernel os <<EOF
+$basic_os
+EOF
+               IFS=$saved_IFS
+               ;;
+       # Default OS when just kernel was specified
+       nto*)
+               kernel=nto
+               os=`echo "$basic_os" | sed -e 's|nto|qnx|'`
+               ;;
+       linux*)
+               kernel=linux
+               os=`echo "$basic_os" | sed -e 's|linux|gnu|'`
+               ;;
+       managarm*)
+               kernel=managarm
+               os=`echo "$basic_os" | sed -e 's|managarm|mlibc|'`
+               ;;
+       *)
+               kernel=
+               os=$basic_os
+               ;;
+esac
+
+# Now, normalize the OS (knowing we just have one component, it's not a kernel,
+# etc.)
 case $os in
        # First match some system type aliases that might get confused
        # with valid system types.
@@ -1284,7 +1346,7 @@ case $os in
                os=cnk
                ;;
        solaris1 | solaris1.*)
-               os=`echo $os | sed -e 's|solaris1|sunos4|'`
+               os=`echo "$os" | sed -e 's|solaris1|sunos4|'`
                ;;
        solaris)
                os=solaris2
@@ -1292,9 +1354,6 @@ case $os in
        unixware*)
                os=sysv4.2uw
                ;;
-       gnu/linux*)
-               os=`echo $os | sed -e 's|gnu/linux|linux-gnu|'`
-               ;;
        # es1800 is here to avoid being matched by es* (a different OS)
        es1800*)
                os=ose
@@ -1316,12 +1375,9 @@ case $os in
                os=sco3.2v4
                ;;
        sco3.2.[4-9]*)
-               os=`echo $os | sed -e 's/sco3.2./sco3.2v/'`
-               ;;
-       sco3.2v[4-9]* | sco5v6*)
-               # Don't forget version if it is 3.2v4 or newer.
+               os=`echo "$os" | sed -e 's/sco3.2./sco3.2v/'`
                ;;
-       scout)
+       sco*v* | scout)
                # Don't match below
                ;;
        sco*)
@@ -1330,77 +1386,25 @@ case $os in
        psos*)
                os=psos
                ;;
-       # Now accept the basic system types.
-       # The portable systems comes first.
-       # Each alternative MUST end in a * to match a version number.
-       # sysv* is not here because it comes later, after sysvr4.
-       gnu* | bsd* | mach* | minix* | genix* | ultrix* | irix* \
-            | *vms* | esix* | aix* | cnk* | sunos | sunos[34]*\
-            | hpux* | unos* | osf* | luna* | dgux* | auroraux* | solaris* \
-            | sym* | kopensolaris* | plan9* \
-            | amigaos* | amigados* | msdos* | newsos* | unicos* | aof* \
-            | aos* | aros* | cloudabi* | sortix* \
-            | nindy* | vxsim* | vxworks* | ebmon* | hms* | mvs* \
-            | clix* | riscos* | uniplus* | iris* | isc* | rtu* | xenix* \
-            | knetbsd* | mirbsd* | netbsd* \
-            | bitrig* | openbsd* | solidbsd* | libertybsd* \
-            | ekkobsd* | kfreebsd* | freebsd* | riscix* | lynxos* \
-            | bosx* | nextstep* | cxux* | aout* | elf* | oabi* \
-            | ptx* | coff* | ecoff* | winnt* | domain* | vsta* \
-            | udi* | eabi* | lites* | ieee* | go32* | aux* | hcos* \
-            | chorusrdb* | cegcc* | glidix* \
-            | cygwin* | msys* | pe* | moss* | proelf* | rtems* \
-            | midipix* | mingw32* | mingw64* | linux-gnu* | linux-android* \
-            | linux-newlib* | linux-musl* | linux-uclibc* \
-            | uxpv* | beos* | mpeix* | udk* | moxiebox* \
-            | interix* | uwin* | mks* | rhapsody* | darwin* \
-            | openstep* | oskit* | conix* | pw32* | nonstopux* \
-            | storm-chaos* | tops10* | tenex* | tops20* | its* \
-            | os2* | vos* | palmos* | uclinux* | nucleus* \
-            | morphos* | superux* | rtmk* | windiss* \
-            | powermax* | dnix* | nx6 | nx7 | sei* | dragonfly* \
-            | skyos* | haiku* | rdos* | toppers* | drops* | es* \
-            | onefs* | tirtos* | phoenix* | fuchsia* | redox* | bme* \
-            | midnightbsd* | amdhsa* | unleashed*)
-       # Remember, each alternative MUST END IN *, to match a version number.
-               ;;
        qnx*)
-               case $cpu in
-                   x86 | i*86)
-                       ;;
-                   *)
-                       os=nto-$os
-                       ;;
-               esac
+               os=qnx
                ;;
        hiux*)
                os=hiuxwe2
                ;;
-       nto-qnx*)
-               ;;
-       nto*)
-               os=`echo $os | sed -e 's|nto|nto-qnx|'`
-               ;;
-       sim | xray | os68k* | v88r* \
-           | windows* | osx | abug | netware* | os9* \
-           | macos* | mpw* | magic* | mmixware* | mon960* | lnews*)
-               ;;
-       linux-dietlibc)
-               os=linux-dietlibc
-               ;;
-       linux*)
-               os=`echo $os | sed -e 's|linux|linux-gnu|'`
-               ;;
        lynx*178)
                os=lynxos178
                ;;
        lynx*5)
                os=lynxos5
                ;;
+       lynxos*)
+               # don't get caught up in next wildcard
+               ;;
        lynx*)
                os=lynxos
                ;;
-       mac*)
+       mac[0-9]*)
                os=`echo "$os" | sed -e 's|mac|macos|'`
                ;;
        opened*)
@@ -1445,12 +1449,9 @@ case $os in
        ns2)
                os=nextstep2
                ;;
-       nsk*)
-               os=nsk
-               ;;
        # Preserve the version number of sinix5.
        sinix5.*)
-               os=`echo $os | sed -e 's|sinix|sysv|'`
+               os=`echo "$os" | sed -e 's|sinix|sysv|'`
                ;;
        sinix*)
                os=sysv4
@@ -1473,18 +1474,12 @@ case $os in
        sysvr4)
                os=sysv4
                ;;
-       # This must come after sysvr4.
-       sysv*)
-               ;;
        ose*)
                os=ose
                ;;
        *mint | mint[0-9]* | *MiNT | MiNT[0-9]*)
                os=mint
                ;;
-       zvmoe)
-               os=zvmoe
-               ;;
        dicos*)
                os=dicos
                ;;
@@ -1497,23 +1492,21 @@ case $os in
                        os=eabi
                        ;;
                    *)
-                       os=elf
+                       os=
+                       obj=elf
                        ;;
                esac
                ;;
-       nacl*)
-               ;;
-       ios)
-               ;;
-       none)
-               ;;
-       *-eabi)
+       aout* | coff* | elf* | pe*)
+               # These are machine code file formats, not OSes
+               obj=$os
+               os=
                ;;
        *)
-               echo Invalid configuration \`"$1"\': system \`"$os"\' not recognized 1>&2
-               exit 1
+               # No normalization, but not necessarily accepted, that comes below.
                ;;
 esac
+
 else
 
 # Here we handle the default operating systems that come with various machines.
@@ -1526,42 +1519,54 @@ else
 # will signal an error saying that MANUFACTURER isn't an operating
 # system, and we'll never get to this point.
 
+kernel=
+obj=
 case $cpu-$vendor in
        score-*)
-               os=elf
+               os=
+               obj=elf
                ;;
        spu-*)
-               os=elf
+               os=
+               obj=elf
                ;;
        *-acorn)
                os=riscix1.2
                ;;
        arm*-rebel)
-               os=linux
+               kernel=linux
+               os=gnu
                ;;
        arm*-semi)
-               os=aout
+               os=
+               obj=aout
                ;;
        c4x-* | tic4x-*)
-               os=coff
+               os=
+               obj=coff
                ;;
        c8051-*)
-               os=elf
+               os=
+               obj=elf
                ;;
        clipper-intergraph)
                os=clix
                ;;
        hexagon-*)
-               os=elf
+               os=
+               obj=elf
                ;;
        tic54x-*)
-               os=coff
+               os=
+               obj=coff
                ;;
        tic55x-*)
-               os=coff
+               os=
+               obj=coff
                ;;
        tic6x-*)
-               os=coff
+               os=
+               obj=coff
                ;;
        # This must come before the *-dec entry.
        pdp10-*)
@@ -1583,19 +1588,24 @@ case $cpu-$vendor in
                os=sunos3
                ;;
        m68*-cisco)
-               os=aout
+               os=
+               obj=aout
                ;;
        mep-*)
-               os=elf
+               os=
+               obj=elf
                ;;
        mips*-cisco)
-               os=elf
+               os=
+               obj=elf
                ;;
-       mips*-*)
-               os=elf
+       mips*-*|nanomips*-*)
+               os=
+               obj=elf
                ;;
        or32-*)
-               os=coff
+               os=
+               obj=coff
                ;;
        *-tti)  # must be before sparc entry or we get the wrong os.
                os=sysv3
@@ -1604,7 +1614,8 @@ case $cpu-$vendor in
                os=sunos4.1.1
                ;;
        pru-*)
-               os=elf
+               os=
+               obj=elf
                ;;
        *-be)
                os=beos
@@ -1685,10 +1696,12 @@ case $cpu-$vendor in
                os=uxpv
                ;;
        *-rom68k)
-               os=coff
+               os=
+               obj=coff
                ;;
        *-*bug)
-               os=coff
+               os=
+               obj=coff
                ;;
        *-apple)
                os=macos
@@ -1703,84 +1716,251 @@ case $cpu-$vendor in
                os=none
                ;;
 esac
+
 fi
 
+# Now, validate our (potentially fixed-up) individual pieces (OS, OBJ).
+
+case $os in
+       # Sometimes we do "kernel-libc", so those need to count as OSes.
+       llvm* | musl* | newlib* | relibc* | uclibc*)
+               ;;
+       # Likewise for "kernel-abi"
+       eabi* | gnueabi*)
+               ;;
+       # VxWorks passes extra cpu info in the 4th filed.
+       simlinux | simwindows | spe)
+               ;;
+       # See `case $cpu-$os` validation below
+       ghcjs)
+               ;;
+       # Now accept the basic system types.
+       # The portable systems comes first.
+       # Each alternative MUST end in a * to match a version number.
+       gnu* | android* | bsd* | mach* | minix* | genix* | ultrix* | irix* \
+            | *vms* | esix* | aix* | cnk* | sunos | sunos[34]* \
+            | hpux* | unos* | osf* | luna* | dgux* | auroraux* | solaris* \
+            | sym* |  plan9* | psp* | sim* | xray* | os68k* | v88r* \
+            | hiux* | abug | nacl* | netware* | windows* \
+            | os9* | macos* | osx* | ios* | tvos* | watchos* \
+            | mpw* | magic* | mmixware* | mon960* | lnews* \
+            | amigaos* | amigados* | msdos* | newsos* | unicos* | aof* \
+            | aos* | aros* | cloudabi* | sortix* | twizzler* \
+            | nindy* | vxsim* | vxworks* | ebmon* | hms* | mvs* \
+            | clix* | riscos* | uniplus* | iris* | isc* | rtu* | xenix* \
+            | mirbsd* | netbsd* | dicos* | openedition* | ose* \
+            | bitrig* | openbsd* | secbsd* | solidbsd* | libertybsd* | os108* \
+            | ekkobsd* | freebsd* | riscix* | lynxos* | os400* \
+            | bosx* | nextstep* | cxux* | oabi* \
+            | ptx* | ecoff* | winnt* | domain* | vsta* \
+            | udi* | lites* | ieee* | go32* | aux* | hcos* \
+            | chorusrdb* | cegcc* | glidix* | serenity* \
+            | cygwin* | msys* | moss* | proelf* | rtems* \
+            | midipix* | mingw32* | mingw64* | mint* \
+            | uxpv* | beos* | mpeix* | udk* | moxiebox* \
+            | interix* | uwin* | mks* | rhapsody* | darwin* \
+            | openstep* | oskit* | conix* | pw32* | nonstopux* \
+            | storm-chaos* | tops10* | tenex* | tops20* | its* \
+            | os2* | vos* | palmos* | uclinux* | nucleus* | morphos* \
+            | scout* | superux* | sysv* | rtmk* | tpf* | windiss* \
+            | powermax* | dnix* | nx6 | nx7 | sei* | dragonfly* \
+            | skyos* | haiku* | rdos* | toppers* | drops* | es* \
+            | onefs* | tirtos* | phoenix* | fuchsia* | redox* | bme* \
+            | midnightbsd* | amdhsa* | unleashed* | emscripten* | wasi* \
+            | nsk* | powerunix* | genode* | zvmoe* | qnx* | emx* | zephyr* \
+            | fiwix* | mlibc* | cos* | mbr* | ironclad* )
+               ;;
+       # This one is extra strict with allowed versions
+       sco3.2v2 | sco3.2v[4-9]* | sco5v6*)
+               # Don't forget version if it is 3.2v4 or newer.
+               ;;
+       # This refers to builds using the UEFI calling convention
+       # (which depends on the architecture) and PE file format.
+       # Note that this is both a different calling convention and
+       # different file format than that of GNU-EFI
+       # (x86_64-w64-mingw32).
+       uefi)
+               ;;
+       none)
+               ;;
+       kernel* | msvc* )
+               # Restricted further below
+               ;;
+       '')
+               if test x"$obj" = x
+               then
+                       echo "Invalid configuration '$1': Blank OS only allowed with explicit machine code file format" 1>&2
+               fi
+               ;;
+       *)
+               echo "Invalid configuration '$1': OS '$os' not recognized" 1>&2
+               exit 1
+               ;;
+esac
+
+case $obj in
+       aout* | coff* | elf* | pe*)
+               ;;
+       '')
+               # empty is fine
+               ;;
+       *)
+               echo "Invalid configuration '$1': Machine code format '$obj' not recognized" 1>&2
+               exit 1
+               ;;
+esac
+
+# Here we handle the constraint that a (synthetic) cpu and os are
+# valid only in combination with each other and nowhere else.
+case $cpu-$os in
+       # The "javascript-unknown-ghcjs" triple is used by GHC; we
+       # accept it here in order to tolerate that, but reject any
+       # variations.
+       javascript-ghcjs)
+               ;;
+       javascript-* | *-ghcjs)
+               echo "Invalid configuration '$1': cpu '$cpu' is not valid with os '$os$obj'" 1>&2
+               exit 1
+               ;;
+esac
+
+# As a final step for OS-related things, validate the OS-kernel combination
+# (given a valid OS), if there is a kernel.
+case $kernel-$os-$obj in
+       linux-gnu*- | linux-android*- | linux-dietlibc*- | linux-llvm*- \
+                   | linux-mlibc*- | linux-musl*- | linux-newlib*- \
+                   | linux-relibc*- | linux-uclibc*- )
+               ;;
+       uclinux-uclibc*- )
+               ;;
+       managarm-mlibc*- | managarm-kernel*- )
+               ;;
+       windows*-msvc*-)
+               ;;
+       -dietlibc*- | -llvm*- | -mlibc*- | -musl*- | -newlib*- | -relibc*- \
+                   | -uclibc*- )
+               # These are just libc implementations, not actual OSes, and thus
+               # require a kernel.
+               echo "Invalid configuration '$1': libc '$os' needs explicit kernel." 1>&2
+               exit 1
+               ;;
+       -kernel*- )
+               echo "Invalid configuration '$1': '$os' needs explicit kernel." 1>&2
+               exit 1
+               ;;
+       *-kernel*- )
+               echo "Invalid configuration '$1': '$kernel' does not support '$os'." 1>&2
+               exit 1
+               ;;
+       *-msvc*- )
+               echo "Invalid configuration '$1': '$os' needs 'windows'." 1>&2
+               exit 1
+               ;;
+       kfreebsd*-gnu*- | kopensolaris*-gnu*-)
+               ;;
+       vxworks-simlinux- | vxworks-simwindows- | vxworks-spe-)
+               ;;
+       nto-qnx*-)
+               ;;
+       os2-emx-)
+               ;;
+       *-eabi*- | *-gnueabi*-)
+               ;;
+       none--*)
+               # None (no kernel, i.e. freestanding / bare metal),
+               # can be paired with an machine code file format
+               ;;
+       -*-)
+               # Blank kernel with real OS is always fine.
+               ;;
+       --*)
+               # Blank kernel and OS with real machine code file format is always fine.
+               ;;
+       *-*-*)
+               echo "Invalid configuration '$1': Kernel '$kernel' not known to work with OS '$os'." 1>&2
+               exit 1
+               ;;
+esac
+
 # Here we handle the case where we know the os, and the CPU type, but not the
 # manufacturer.  We pick the logical manufacturer.
 case $vendor in
        unknown)
-               case $os in
-                       riscix*)
+               case $cpu-$os in
+                       *-riscix*)
                                vendor=acorn
                                ;;
-                       sunos*)
+                       *-sunos*)
                                vendor=sun
                                ;;
-                       cnk*|-aix*)
+                       *-cnk* | *-aix*)
                                vendor=ibm
                                ;;
-                       beos*)
+                       *-beos*)
                                vendor=be
                                ;;
-                       hpux*)
+                       *-hpux*)
                                vendor=hp
                                ;;
-                       mpeix*)
+                       *-mpeix*)
                                vendor=hp
                                ;;
-                       hiux*)
+                       *-hiux*)
                                vendor=hitachi
                                ;;
-                       unos*)
+                       *-unos*)
                                vendor=crds
                                ;;
-                       dgux*)
+                       *-dgux*)
                                vendor=dg
                                ;;
-                       luna*)
+                       *-luna*)
                                vendor=omron
                                ;;
-                       genix*)
+                       *-genix*)
                                vendor=ns
                                ;;
-                       clix*)
+                       *-clix*)
                                vendor=intergraph
                                ;;
-                       mvs* | opened*)
+                       *-mvs* | *-opened*)
+                               vendor=ibm
+                               ;;
+                       *-os400*)
                                vendor=ibm
                                ;;
-                       os400*)
+                       s390-* | s390x-*)
                                vendor=ibm
                                ;;
-                       ptx*)
+                       *-ptx*)
                                vendor=sequent
                                ;;
-                       tpf*)
+                       *-tpf*)
                                vendor=ibm
                                ;;
-                       vxsim* | vxworks* | windiss*)
+                       *-vxsim* | *-vxworks* | *-windiss*)
                                vendor=wrs
                                ;;
-                       aux*)
+                       *-aux*)
                                vendor=apple
                                ;;
-                       hms*)
+                       *-hms*)
                                vendor=hitachi
                                ;;
-                       mpw* | macos*)
+                       *-mpw* | *-macos*)
                                vendor=apple
                                ;;
-                       *mint | mint[0-9]* | *MiNT | MiNT[0-9]*)
+                       *-*mint | *-mint[0-9]* | *-*MiNT | *-MiNT[0-9]*)
                                vendor=atari
                                ;;
-                       vos*)
+                       *-vos*)
                                vendor=stratus
                                ;;
                esac
                ;;
 esac
 
-echo "$cpu-$vendor-$os"
+echo "$cpu-$vendor${kernel:+-$kernel}${os:+-$os}${obj:+-$obj}"
 exit
 
 # Local variables: