Robert Watson wrote:
On Thu, 21 May 2009, [email protected] wrote:
How do I compile the system binutils (contrib/binutils) as i386 ->
x86_64 cross utils? That is, binutils that will run on an i386 host
but will produce x86_64 binaries?
I'm trying to produce a bootstrapping compiler for a port and need to
get these working. I've spent a while reading Makefiles but would
rather get information from someone who actually knows rather than
waste *another* week on this stuff.
I'd rather not compile the entire world if it can be avoided.
Not really my area, but if you haven't found "make toolchain" and "make
buildenv" then you might want to take a look. Typically these will be
combined with TARGET_ARCH=foo, and in your case foo is 'amd64'. The
former builds the toolchain required for the architecture, and the
latter creates a shell environment with paths appropriately munged and
environments appropriately set to cross-compile using that chain.
Normally the toolchain step is part of our integrated
buildworld/buildkernel/etc process, but you can also use it for other
things with buildenv.
I munged that once to create a nested jail/chroot set up so that
default toolchain was the cross set. so if you did 'cc foo.c'
you got a cross binary..
if you needed a native cc you did it in the outside chroot.
worked like a charm.
from the outside, you just did 'chroot cross cc foo.c' to get cross
binary.
Robert N M Watson
Computer Laboratory
University of Cambridge
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