#!/bin/bash

prefix=/usr/local
kerneldir=/lib/modules/$(uname -r)/build
want_module=1
qemu_cc=$(ls /usr/bin/gcc3* /usr/bin/gcc-3* 2>/dev/null | tail -n1)
disable_gcc_check=

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

	Options include:

	    --prefix=PREFIX        where to install things ($prefix)
	    --with-patched-kernel  don't use external module
	    --kerneldir=DIR        kernel build directory ($kerneldir)
	    --qemu-cc="$qemu_cc"   compiler for qemu (needs gcc3.x) ($qemu_cc)
	    --disable-gcc-check    don't insist on gcc-3.x
                                   - this will break running without kvm
EOF
    exit 1
}


# prefer gcc if its version is 3.* ( over a compat-gcc )
# do it before parsing command line arguments to enable the user
#    to specify a specific gcc he/she likes.
if gcc -v 2>&1 | grep -q 'gcc *version *3\.[2-4]\.[0-9]'; then
	qemu_cc=gcc
fi

while [[ "$1" = -* ]]; do
    opt="$1"; shift
    arg=
    if [[ "$opt" = *=* ]]; then
	arg="${opt#*=}"
	opt="${opt%%=*}"
    fi
    case "$opt" in
	--prefix)
	    prefix="$arg"
	    ;;
	--kerneldir)
	    kerneldir="$arg"
	    ;;
	--with-patched-kernel)
	    want_module=
	    ;;
	--qemu-cc)
	    qemu_cc="$arg"
	    ;;
	--disable-gcc-check)
	    disable_gcc_check=1
	    ;;
	--help)
	    usage
	    ;;
	*)
	    usage
	    ;;
    esac
done

if [[ -z "$qemu_cc" ]]; then
    echo "$0: cannot locate gcc 3.x. please install it or specify with --qemu-cc"
    exit 1
fi

libkvm_kerneldir="$kerneldir"
if (( want_module )); then
    libkvm_kerneldir=$(readlink -f kernel)
fi

target_cpu() {
    if [[ $(uname -m) = i?86 ]]; then
	echo i386
    else
	uname -m
    fi
}

(cd user; ./configure --prefix="$prefix" --kerneldir="$libkvm_kerneldir")
(cd qemu; ./configure --target-list=$(target_cpu)-softmmu --cc="$qemu_cc" \
    --disable-kqemu --extra-cflags="-I $PWD/../user" \
    --extra-ldflags="-L $PWD/../user" \
    --enable-kvm --kernel-path="$libkvm_kerneldir" \
    --enable-alsa \
    ${disable_gcc_check:+"--disable-gcc-check"} \
    --prefix="$prefix"
)



cat <<EOF > config.mak
PREFIX=$prefix
KERNELDIR=$(readlink -f $kerneldir)
WANT_MODULE=$want_module
EOF