#!/bin/bash

prefix=/usr/local
kerneldir=/lib/modules/$(uname -r)/build
cc=gcc
ld=ld
objcopy=objcopy
ar=ar
arch=`uname -m | sed -e s/i.86/i386/`
processor="$arch"
cross_prefix=

usage() {
    cat <<-EOF
	Usage: $0 [options]

	Options include:
	    --arch=ARCH            architecture to compile for ($arch)
	    --cross-prefix=PREFIX  cross compiler prefix
	    --cc=CC		   c compiler to use ($cc)
	    --ld=LD		   ld linker to use ($ld)
	    --prefix=PREFIX        where to install things ($prefix)
	    --kerneldir=DIR        kernel build directory for kvm.h ($kerneldir)
EOF
    exit 1
}

while [[ "$1" = -* ]]; do
    opt="$1"; shift
    arg=
    if [[ "$opt" = *=* ]]; then
	arg="${opt#*=}"
	opt="${opt%%=*}"
    fi
    case "$opt" in
	--prefix)
	    prefix="$arg"
	    ;;
	--kerneldir)
	    kerneldir="$arg"
	    ;;
        --arch)
	    arch="$arg"
	    ;;
        --processor)
	    processor="$arg"
	    ;;
	--cross-prefix)
	    cross_prefix="$arg"
	    ;;
	--cc)
	    cc="$arg"
	    ;;
	--ld)
	    ld="$arg"
	    ;;
	--help)
	    usage
	    ;;
	*)
	    usage
	    ;;
    esac
done

cat <<EOF > config.mak
PREFIX=$prefix
KERNELDIR=$(readlink -f $kerneldir)
ARCH=$arch
PROCESSOR=$processor
CC=$cross_prefix$cc
LD=$cross_prefix$ld
OBJCOPY=$cross_prefix$objcopy
AR=$cross_prefix$ar
EOF