I got it completely working now! I did have to repack
binutils-{i586,x86-64}-linux-gnu though.
Tested that I can generate both i386 and aarch64 binaries, solely by
specifying `-P`. Still haven't actually tested linking with libc, for
that we'll need to do something nasty about /lib32/ (probably just
some ifdefs based on the *host* platform - need to extend the arch
tables for that)
For packaging, you'll almost certainly want to split up the
fp-compiler bits into 2-5 packages
(fp-compiler-{bin,driver,config,config-$fpc_target}). Note that the
new /etc/fpc/debian.cfg must be installed from the *unversioned*
package - which will require a "backwards" dependency
(fp-compiler-config-3.0.0 depends on fp-compiler-config-common).
Updated the GIST at the same URL:
https://gist.github.com/o11c/cf98115ba716ebdd1dc2cc75b290f321
