README.mingw32_cross

--- CROSSCOMPILATION GOAL ---

This page describes crosscompilation (building win32 programs on linux)

Follow this instructions on linux (or Unix?) and you will have a library,
which can be used on linux/unix to build win32 applications that use FLTK.

Then you can use Wine for testing, and develop windows programs while being 
windows-free \o/ (well, for real applications, do use beta testers with real
windows).


--- TOOLS ---

You will need
- FLTK sources
- mingw cross compiler: you must have programs like i586-mingw32msvc-c++
	in Ubuntu for example, they are in *mingw* package.
	The prefix i586-mingw... was i486 i386 etc previously
	if you have other name then adjust instructions below to match it
- g++ and make
- autoconfig

--- DO IT ---
Execute this long command:

make clean ; autoconf ; ./configure --build="i586-mingw32msvc" --host="i586-mingw32msvc"  --target="i586-mingw32msvc" --prefix="/home/DEVEL/packs/fltk2/cross_win32" ; make -j 4 ; make install   

You will see information like:
checking for gcc... i586-mingw32msvc-gcc
checking for C compiler default output file name... a.exe

After all (around 1-5 minutes on ~2GHz) there will be errors reported about undefined references,
but ignore them.

Library should be builded now.

--- CHECK ---
Was all successfull? Check.

Use: 
file lib/*.a

if it displays:
	lib/libfltk2.a:        current ar archive
	lib/libfltk2_gl.a:     current ar archive
	lib/libfltk2_png.a:    current ar archive
	(...)
then the lib is builded

Check file src/*.o to see if it was builded as windows version (crossbuilded)
	src/fillrect.o:           80386 COFF executable not stripped - version 30821
	src/Fl_Menu_Item.o:       80386 COFF executable not stripped - version 30821
	(...)

--- INSTALL IT ---
Create the directory mentioned in --prefix above (or start over with another prefix)

make install

After this you will be able to crossbuild programs by calling i586-..-g++ 
with proper flags (returned by fltk-config)

TODO (finish this document!) --Rafal