configure

#!/bin/sh

TARGET=""
OS=""
IMG=""

target()
{
   TARGET="$1"
   test -n "$2" && OS="$2"
   test -n "$3" && IMG="$3"
}

process()
{
  case "$1" in
  --target=c)   target c;;
  --target=x86-linux*)   target x86 linux elf;;
  --target=x86-windows)   target x86 windows pe;;
  --target=m68k-tos)   target m68k tos gemdos;;
  --prefix)   ;;
  *)   echo Unknown argument: $1; exit 1;;
  esac
}

host_is_target()
{
  case `uname -m` in
    c) TARGET=c ;;
    i?86*|x86*) TARGET=x86 ;;
    m68*) TARGET=m86k ;;
    arm*) TARGET=arm ;;
    *) echo "Unsupported machine; using the C target"; TARGET=c ;;
  esac

  case `uname -s` in
    Linux) OS=linux; IMG=elf ;;
    CYGWIN*) OS=windows; IMG=pe ;;
    *MiNT|*mint|*TOS) OS=tos; IMG=gemdos ;;
    Darwin) OS=osx ;; #IMG=macho
    *) echo "Unsupported operating system" ;;
  esac
}

while test -n "$1"; do
  process "$1"
  shift
done

test -z "$TARGET" && host_is_target

rm -f conf.mk
echo TARGET="$TARGET" >> conf.mk
test -n "$OS" && echo OS="$OS" >> conf.mk
test -n "$IMG" && echo IMG="$IMG" >> conf.mk