Cross-compilation to i386

[Francois Tigeot]

[copy to -current since it may be of help to other freebsd ports]

On Thu, Mar 04, 2004 at 06:51:03PM +0100, Francois Tigeot wrote:
> 
> I'm currently running a 5.2.1-RELEASE/amd64 system and I'm trying to
> cross-build an i386 world with the following command :
> 
> time nice make buildworld TARGET_ARCH=i386 DESTDIR=/itx
> 
> This fails miserably with these error messages :
> 
> cc -Os -march=c3 -fno-strict-aliasing -pipe -I/usr/src/sbin/gbde/../../sys -DRESCUE -Wsystem -headers -Werror -Wall -Wno-format-y2k -W -Wstrict-prototypes -Wmissing-prototypes -Wpointer -arith -Wreturn-type -Wcast-qual -Wwrite-strings -Wswitch -Wshadow -Wcast-align  -c /usr/src/sys/crypto/sha2/sha2.c
> {standard input}: Assembler messages:
> {standard input}:92: Error: bignum invalid
> {standard input}:93: Error: bignum invalid
> [more bignum invalid lines]

I've managed to make it work.

The 'bignum invalid' error is caused by this type of gcc-generated
assembly code :

		.quad	8158064640168781261
		.quad	-5349999486874862801

For some reason, as doesn't like big negative numbers.

This is what I did :

	- I installed a stock copy of binutils compiled with
	--target=i386-freebsd and --enable-64-bit-bfd

	- I initiated a buildworld to populate /usr/obj

	- After the first build failure, I replaced /usr/obj/i386/usr/src/amd64/usr/bin/as
	with the new assembler, protecting it by a chflags command

The world and kernel builds then completed succesfully. The new i386 kernel
boots on a diskless machine.

Now, I understand a new binutils import was scheduled before 5.3-RELEASE.
Is there any reason not to compile it with the '--enable-64-bit-bfd'
option on 64-bit architectures ?

-- 
Francois Tigeot