# oper-:arch-:syst-:chip-:kern-
# oper = operating system type; e.g., sunos-4.1.4
# arch = machine language; e.g., sparc
# syst = which binaries can run; e.g., sun4
# chip = chip model; e.g., micro-2-80
# kern = kernel version; e.g., sun4m
# dependence: arch --- chip
#                 \        \
#          oper --- syst --- kern
# so, for example, syst is interpreted in light of oper, but chip is not.
# anyway, no slashes, no extra colons, no uppercase letters.
# the point of the extra -'s is to ease parsing: can add hierarchies later.
# e.g., *:i386-*:*:pentium-*:* would handle pentium-100 as well as pentium,
# and i386-486 (486s do have more instructions, you know) as well as i386.
# the idea here is to include ALL useful available information.

exec 2>/dev/null
sys="`uname -s | tr '/:[A-Z]' '..[a-z]'`"
if [ x"$sys" != x ]
then
  unamer="`uname -r | tr /: ..`"
  unamem="`uname -m | tr /: ..`"
  unamev="`uname -v | tr /: ..`"

  case "$sys" in
  bsd.os)
    # in bsd 4.4, uname -v does not have useful info.
    # in bsd 4.4, uname -m is arch, not chip.
    oper="$sys-$unamer"
    arch="$unamem"
    syst=""
    chip="`sysctl -n hw.model`"
    kern=""
    ;;
  freebsd)
    # see above about bsd 4.4
    oper="$sys-$unamer"
    arch="$unamem"
    syst=""
    chip="`sysctl -n hw.model`" # hopefully
    kern=""
    ;;
  linux)
    # as in bsd 4.4, uname -v does not have useful info.
    oper="$sys-$unamer"
    arch="i386" # always correct for now
    syst=""
    chip="$unamem"
    kern=""
    ;;
  aix)
    # naturally IBM has to get uname -r and uname -v backwards. dorks.
    oper="$sys-$unamev-$unamer"
    arch="`arch | tr /: ..`"
    syst=""
    chip="$unamem"
    kern=""
    ;;
  sunos)
    oper="$sys-$unamer-$unamev"
    arch="`(uname -p || mach) | tr /: ..`"
    syst="`arch | tr /: ..`"
    chip="$unamem" # this is wrong; is there any way to get the real info?
    kern="`arch -k | tr /: ..`"
    ;;
  *)
    oper="$sys-$unamer-$unamev"
    arch="`arch | tr /: ..`"
    syst=""
    chip="$unamem"
    kern=""
    ;;
  esac
else
  $CC -c trycpp.c
  $LD -o trycpp trycpp.o
  case `./trycpp` in
  nextstep)
    oper="nextstep-`hostinfo | sed -n 's/^[ 	]*NeXT Mach \([^:]*\):.*$/\1/p'`"
    arch="`hostinfo | sed -n 's/^Processor type: \(.*\) (.*)$/\1/p' | tr /: ..`"
    syst=""
    chip="`hostinfo | sed -n 's/^Processor type: .* (\(.*\))$/\1/p' | tr ' /:' '...'`"
    kern=""
    ;;
  *)
    oper="unknown"
    arch=""
    syst=""
    chip=""
    kern=""
    ;;
  esac
fi

case "$chip" in
Intel.586)
  # no, you nitwits, there is no such chip. (NeXTStep)
  chip=pentium
  ;;
i586)
  # no, you nitwits, there is no such chip. (Linux)
  chip=pentium
  ;;
esac

echo "$oper-:$arch-:$syst-:$chip-:$kern-" | tr ' [A-Z]' '.[a-z]'
