#! /bin/sh
# Remarks, Bugs and additions to bon@elektron.ikp.physik.th-darmstadt.de
# You must either have :
# - untarred binutils and gcc
# - or the Tarfiles for binutils and gcc
# - or have a link to these files 
# in $BASEDIR
# 
# If $DJGPPDIR exists, it is assumed that you have the right version of the
# cross-devellopment files installed
# If $DJGPPDIR doesn't exist, djcrxXXX.zip, or a link to that file is 
# needed in $BASEDIR
#
# Get binutils-X.X.X.tar.gz and gcc-X.X.X.tar.gz at your nearest GNU Software 
# Repository, e.g. ftp://prep.ai.mit.edu/pub/gnu. Get /pub/gnu/GNUinfo/FTP to
# find a mirror near you. 
# At the time of writing, binutils-2.6 have a bug in gas when assembling for
# the COFF-Format. So use version 2.5.2 until you know that bug is fixed.
#
# djcrxXXXX.zip is a collection of needed files to build a cross compiler
# to make MSDOS executables. It is part of djgpp, a port of the GNU Utilities 
# to MSDOS, done by dj@delorie.com and others. At the time of writing this 
# script this collection only exists for DJGPP Version 2 BETA.
# If you want to use version 1, you are on your own.
# 
# Get djcrxXXX.zip, with XXX >=200, from one of the official sites for the
# DJGPP beta program:
#
# Official DJGPP V2 Beta FTP Sites
# 
# ftp.delorie.com            pub/djgpp/beta/v2   (slow, USA)
# ftp.idsoftware.com         djgpp/beta/v2       (fast, USA)
# fly.cc.fer.hr              pub/msdos/djgpp-v2  (medium, Europe)
# turnbull.sk.tsukuba.ac.jp  pub/djgpp/2.0-beta  (fast, Asia)
# phi.sinica.edu.tw          pub/GNU/djgpp/mirror/2.0-beta
# 
# Note: ftp.delorie.com will always have the latest copy of this file.
# Check there for new sites.
# 
# DJ
# dj@delorie.com
# http://www.delorie.com/
#
#
# This script is based on the remarks 
# "Building GCC 2.7.0 as a Unix to DOS cross-compiler " by DJ Delorie
# http://www.delorie.com/djgpp/faq/cross/gcc270-unix-to-dos.html
# tested on and adapted for a Linux-1.3.54-a.out machine with gcc-2.7.2 
# and libc-4.5.26 by Uwe Bonnes bob@elektron.ikp.physik.th-darmstadt.de
# Use at your own risk



#Change to your settings
BASEDIR=/home/bon/tmp/dos-gcc1
DJGPPDIR=/usr/local/djgpp
#Which version for the packages
BINUTIL=2.5.2
GCC=2.7.2
DJGPP=200
# No change should be needed
BINTARGET=i386-coff-go32
TARGET=i386-go32-msdos
# Nothing to change below

export BASEDIR
export BINTARGET
export TARGET
export GCC
export BINUTIL
export DJGPPDIR
export DJGPP

mkdir -p $BASEDIR
cd $BASEDIR

#Check requirements
if [ ! -d gcc-$GCC ];then 
	if [ -e gcc-$GCC.tar.gz ];then
		echo "Untarring gcc-$GCC.tar.gz in $BASEDIR"
		tar fxz gcc-$GCC.tar.gz
	else
		echo "You must have gcc-$GCC.tar.gz in $BASEDIR"
		exit
	fi
fi

if [ ! -d binutils-$BINUTIL ];then 
	if [ -e binutils-$BINUTIL.tar.gz ];then
		echo "Untarring binutils-$BINUTIL.tar.gz in $BASEDIR"
		tar fxz binutils-$BINUTIL.tar.gz
    else
		echo "You have binutils-$BINUTIL.tar.gz in $BASEDIR"
		exit
	fi
fi

mkdir -p $DJGPPDIR
if [ ! -w $DJGPPDIR -o ! -w /usr/lib/gcc-lib \
	   -o ! -w /usr/local/bin ];then
   echo -n "Must be root, as compiling gcc as a cross-compiler requires access"
   echo " to some system directories "
   exit
fi
if [ ! -d $DJGPPDIR/lib ];then
	if [ -e djcrx$DJGPP.zip ];then
		cd $DJGPPDIR
		echo "Unzipping djcrx$DJGPP.zip in $DJGPPDIR"
		unzip -L -a $BASEDIR/djcrx$DJGPP.zip > /dev/null 2>&1
		cd $BASEDIR
	else
		echo "You must have djcrx$DJGPP.zip in $BASEDIR "
		exit
    fi
fi

if [ ! -x $DJGPPDIR/src/stub/stubify ];then
	echo "Building stubify"
	cd $DJGPPDIR/src/stub
	gcc stubify.c -o stubify
	cd $BASEDIR
fi

NEEDFIX=`grep coff-go32 $DJGPPDIR/lib/djgpp.lnk`
export $NEEDFIX >/dev/null 2>&1
if [ "$NEEDFIX" = 'OUTPUT_FORMAT("coff-go32")' ];then
	echo "Changing djgpp.lnk "
	mv $DJGPPDIR/lib/djgpp.lnk $DJGPPDIR/lib/djgpp.org
	sed 's/OUTPUT_FORMAT("coff-go32")/OUTPUT_FORMAT("coff-i386")/g'\
		$DJGPPDIR/lib/djgpp.org >$DJGPPDIR/lib/djgpp.lnk
else
	echo "Good, djgpp.lnk uses right format"
fi

mkdir -p $BASEDIR/dos-binu

cd $BASEDIR/dos-binu

echo "Configuring binutils-$BINUTIL to cross-devellop for msdos"
../binutils-$BINUTIL/configure --target=$BINTARGET > configure.log 2>&1

echo "Compiling binutils-$BINUTIL"
make CFLAGS=-O  > make.log 2>&1

mkdir -p /usr/lib/gcc-lib/$TARGET/$GCC

echo "Installing executables in /usr/lib/gcc-lib/$TARGET/$GCC"
cd binutils

cp ar c++filt objcopy objdump size /usr/lib/gcc-lib/$TARGET/$GCC
cp nm.new     /usr/lib/gcc-lib/$TARGET/$GCC/nm
cp strip.new  /usr/lib/gcc-lib/$TARGET/$GCC/strip

cd ../gas
cp as.new   /usr/lib/gcc-lib/$TARGET/$GCC/as
cp gasp.new /usr/lib/gcc-lib/$TARGET/$GCC/gasp

cd ../ld
cp ld.new   /usr/lib/gcc-lib/$TARGET/$GCC/ld

cd $BASEDIR

mkdir -p $BASEDIR/dos-gcc 

cd $BASEDIR/dos-gcc
touch libgcc1.a
echo "Configuring gcc-$GCC to cross compiling for msdos"
../gcc-$GCC/configure --target=$TARGET > configure.log 2>&1

echo "Compiling gcc-$GCC"
make LANGUAGES=c CFLAGS=-O -s > make.log 2>&1

echo "Installing cross-compiler as /usr/local/bin/gcc-dos"
cp xgcc  /usr/local/bin/gcc-dos
mkdir -p /usr/lib/gcc-lib/$TARGET/$GCC
cp cc1   /usr/lib/gcc-lib/$TARGET/$GCC/cc1
cp cccp  /usr/lib/gcc-lib/$TARGET/$GCC/cpp
									  
cd       /usr/lib/gcc-lib/$TARGET/$GCC
ln -s    $DJGPPDIR/include .
ln -s    $DJGPPDIR/lib/* .
mv       $DJGPPDIR/src/stub/stubify .

cd $BASEDIR
cat <<eof > hello.c
#include <stdlib.h>
#include <stdio.h>
#include <dos.h>


void main()
{
  printf("Hello world\n");
}
eof

echo "Done!"
echo 'Try "gcc-dos hello.c -o hello.exe" in $BASEDIR '
echo "hallo.exe should run in dosemu"