#!/bin/sh

# The make-config.sh script uses information about the target machine
# to set things up for compilation. It's vaguely like a stripped-down
# version of autoconf. It's intended to be run as part of make.sh. The
# only time you'd want to run it by itself is if you're trying to
# cross-compile the system or if you're doing some kind of
# troubleshooting.

# This software is part of the SBCL system. See the README file for
# more information.
#
# This software is derived from the CMU CL system, which was
# written at Carnegie Mellon University and released into the
# public domain. The software is in the public domain and is
# provided with absolutely no warranty. See the COPYING and CREDITS
# files for more information.

echo //entering make-config.sh

echo //ensuring the existence of output/ directory
if [ ! -d output ] ; then mkdir output; fi

ltf=`pwd`/local-target-features.lisp-expr
echo //initializing $ltf
echo ';;;; This is a machine-generated file.' > $ltf
echo ';;;; Please do not edit it by hand.' >> $ltf
echo ';;;; See make-config.sh.' >> $ltf
printf '(' >> $ltf

echo //guessing default target CPU architecture from host architecture
case `uname -m` in 
    *86) guessed_sbcl_arch=x86 ;; 
    [Aa]lpha) guessed_sbcl_arch=alpha ;;
    sparc*) guessed_sbcl_arch=sparc ;;
    sun*) guessed_sbcl_arch=sparc ;;
    ppc) guessed_sbcl_arch=ppc ;;
    *)
        # If we're not building on a supported target architecture, we
	# we have no guess, but it's not an error yet, since maybe
	# target architecture will be specified explicitly below.
	guessed_sbcl_arch=''
	;;
esac

echo //setting up CPU-architecture-dependent information
sbcl_arch=${SBCL_ARCH:-$guessed_sbcl_arch}
echo sbcl_arch=\"$sbcl_arch\"
if [ "$sbcl_arch" = "" ] ; then
    echo "can't guess target SBCL architecture, need SBCL_ARCH environment var"
    exit 1
fi
printf ":%s" "$sbcl_arch" >> $ltf 
# KLUDGE: currently the x86 only works with the generational garbage
# collector (indicated by the presence of :GENCGC in *FEATURES*) and
# alpha, sparc and ppc with the stop'n'copy collector (indicated by
# the absence of :GENCGC in *FEATURES*). This isn't a great
# separation, but for now, rather than have :GENCGC in
# base-target-features.lisp-expr, we add it into local-target-features
# if we're building for x86. -- CSR, 2002-02-21 Then we do something
# similar with :STACK-GROWS-FOOWARD, too. -- WHN 2002-03-03
if [ "$sbcl_arch" = "x86" ] ; then
    printf ' :gencgc :stack-grows-downward-not-upward' >> $ltf
else
    # Nothing need be done in this case, but sh syntax wants a placeholder.
    echo > /dev/null
fi
for d in src/compiler src/assembly; do
    echo //setting up symlink $d/target
    original_dir=`pwd`
    cd $d
    if [ -h target ] ; then
	rm target
    elif [ -w target ] ; then
	echo "I'm afraid to replace non-symlink $d/target with a symlink."
	exit 1
    fi
    if [ -d $sbcl_arch ] ; then
	ln -s $sbcl_arch target
    else
	echo "missing sbcl_arch directory $PWD/$sbcl_arch"
	exit 1
    fi
    cd $original_dir
done

echo //setting up OS-dependent information
original_dir=`pwd`
cd src/runtime/
rm -f Config target-arch-os.h target-arch.h target-os.h target-lispregs.h
# KLUDGE: these two logically belong in the previous section
# ("architecture-dependent"); it seems silly to enforce this in terms
# of the shell script, though. -- CSR, 2002-02-03
ln -s $sbcl_arch-arch.h target-arch.h
ln -s $sbcl_arch-lispregs.h target-lispregs.h
case `uname` in 
    Linux)
	printf ' :linux' >> $ltf
	ln -s Config.$sbcl_arch-linux Config
	ln -s $sbcl_arch-linux-os.h target-arch-os.h
	ln -s linux-os.h target-os.h
	;;
    OSF1)			
        # it's changed name twice since it was called OSF/1: clearly
        # the marketers forgot to tell the engineers about Digital Unix
        # _or_ OSF/1 ...
	printf ' :osf1' >> $ltf
        ln -s Config.$sbcl_arch-osf1 Config
	ln -s $sbcl_arch-osf1-os.h target-arch-os.h
	ln -s osf1-os.h target-os.h
	;;
    *BSD)
	printf ' :bsd' >> $ltf
	ln -s $sbcl_arch-bsd-os.h target-arch-os.h
	ln -s bsd-os.h target-os.h
	case `uname` in
	    FreeBSD)
		printf ' :freebsd' >> $ltf
		ln -s Config.$sbcl_arch-freebsd Config
		;;
	    OpenBSD)
		printf ' :openbsd' >> $ltf
		ln -s Config.$sbcl_arch-openbsd Config
		;;
	    *)
		echo unsupported BSD variant: `uname`
		exit 1
		;;
	esac
	;;
    SunOS)
        printf ' :sunos' >> $ltf
	ln -s Config.$sbcl_arch-sunos Config
	ln -s $sbcl_arch-sunos-os.h target-arch-os.h
	ln -s sunos-os.h target-os.h
	;;
    *)
	echo unsupported OS type: `uname`
	exit 1
	;;
esac
cd $original_dir

echo //finishing $ltf
echo ')' >> $ltf

# FIXME: The version system should probably be redone along these lines:
#
# echo //setting up version information.
# versionfile=version.txt
# cp base-version.txt $versionfile
# echo " (built `date -u` by `whoami`@`hostname`)" >> $versionfile
# echo 'This is a machine-generated file and should not be edited by hand.' >> $versionfile