How to build gcc-2.95.3 for BeOS under Linux (a cross-compiler), which 
will allow you to compile BeOS projects under Linux, i.e. the apps
that this compilers produces can only be executed on BeOS (not on Linux).

*** the major work of creating the cross-compiler and describing the
*** process how to build it has been done by Eric Petit <titer@m0k.org>, 
*** so if you think this cross-compiler is great, please tell him.

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On your Linux-box, open a shell...

0 - Preparations
----------------
...and fetch the 'buildtools' module from the haiku CVS. You should then
have a 'buildtools' folder that contains folders named 'binutils' and
'gcc' (and this file, too!).

	cd buildtools

Now decide where you want to install the cross-compiler. The install 
folder will be referred to as $PREFIX. I suggest to install to 
/opt/cross-tools, but you can basically put it anywhere you like.

	export PREFIX=/opt/cross-tools

and add it the path:

	export PATH=$PATH:$PREFIX/bin

Create two folders for the headers and libraries, say $BEINC and
$BELIB:
	
	mkdir beinc
	export BEINC=$(pwd)/beinc
	mkdir belib
	export BELIB=$(pwd)/belib

Copy all contents from /boot/develop/lib/x86/ on your BeOS install to
$BELIBS on your Linux box (make sure symbolic links are followed). You
should have $BELIBS/libbe.so, etc.

Copy all contents from /boot/develop/headers/ on your BeOS install to
$BEINCS on your Linux box. You should have $BEINCS/be/AppKit.h, etc.


1 - Building binutils
---------------------
	mkdir binutils-obj
	cd binutils-obj
	CFLAGS="-O2" CXXFLAGS="-O2" ../binutils/configure --prefix=$PREFIX \
	--target=i586-pc-beos --disable-nls --enable-shared=yes
	make && make install
	cd ..

2 - Building gcc/g++
--------------------
	mkdir -p $PREFIX/lib/gcc-lib/i586-pc-beos/2.95.3-beos-041202
	mkdir gcc-obj
	cd gcc-obj
	CFLAGS="-O2" CXXFLAGS="-O2" ../gcc/configure --prefix=$PREFIX \
	--target=i586-pc-beos --disable-nls --enable-shared=yes \
	--enable-languages=c,c++ --with-headers=$BEINC --with-libs=$BELIB
	make cross && make install
	cd ..

Ok, now everything is compiled and installed, waiting to be used:

	i586-pc-beos-gcc test.c
	
would compile the file test.c with the fresh cross-compiler.

So have fun!

Please send questions & bug-reports to: Oliver Tappe <gcc@hirschkaefer.de>