On Mon, Jul 05, 1999 at 09:55:40PM +0900, Takahiro Kambe wrote:
> > be aware that ELF is now the default binary format, so you'll have
> > to deal with this after you next updated your sources and want to
> > recompile your system.
> Is there any way to use AOUT format?

If you want to keep on using the a.out format, you can do this by
reverting the change to /usr/src/share/mk/bsd.own.mk. Look for the
part where OBJECT_FMT is set, and change it back for the i386 case.
>
> How do I upgrade by compiling sources, without getting snapshot?

That's not straightforward. Be prepared to get yourself out of trouble
in strange ways if it fails. Basically you have to:

	0) have today's sources
	1) create /emul/aout as described before (i.e. copy all
	   shared libs to /emul/aout/usr/lib)
	2) boot a kernel with COMPAT_AOUT (as well as EXEC_ELF32, of course)
	3) setenv DESTDIR /..
	4) setenv OBJECT_FMT ELF
	5) cd /usr/src ; make includes
	6) cd /usr/src/share/mk ; make install
	4) for each directory in
	   /usr/src/gnu/usr.bin/{binutils,gas.new,ld.new,egcs} do:
	   cd <directory>
	   make
	   (link will fail because OBJECT_FMT is set to elf)
	   setenv OBJECT_FMT a.out
	   make
	   setenv OBJECT_FMT ELF
	5) make install in each of those directories
	   (you now have a toolchain of a.out binaries that will generate
	    ELF binaries)
	6) cd /usr/src/lib/csu ; make && make install
	7) you can now try a "make build" in /usr/src

I _think_ that is what I did, but I can't guarantee anything. If you
want to it this way, good luck, but if you end up having to repair
the system by booting single-user or from floppy, don't blame me ;-)

- Frank