In message: <20100301092144.gs2...@deviant.kiev.zoral.com.ua>
Kostik Belousov <kostik...@gmail.com> writes:
: On Sun, Feb 28, 2010 at 04:07:32PM -0700, M. Warner Losh wrote:
: > In message: <4b8af55c.6040...@freebsd.org>
: > Nathan Whitehorn <nwhiteh...@freebsd.org> writes:
: > : M. Warner Losh wrote:
: > : > In message: <20100228195041.ga68...@server.vk2pj.dyndns.org>
: > : > Peter Jeremy <peterjer...@acm.org> writes:
: > : > : On 2010-Feb-26 14:57:36 +0100, Attilio Rao <atti...@freebsd.org>
: > : > wrote:
: > : > : >For the future, however, probabilly we would need to do something
: > : > like
: > : > : >pc98 already does wrt i386 (i386/include/ pc98/include/
: > : > amd64/include/
: > : > : >just have files wrappers to the generic one under x86/include/ when
: > : > : >necessary).
: > : > : : Not that something like this is also critical for getting
: > : > i386/amd64
: > : > : cross compilation to work - one of the blocking issues is that the
: > : > : correct machine/ includes are not available in cross-compilatio
: > : > mode.
: > : >
: > : > Huh?
: > : >
: > : > I cross build all the time, and the machine/ includes are always
: > : > right, with or without this patch. Maybe you could explain what you
: > : > mean here...
: > : >
: > : > The issue is that old code has
: > : >
: > : > #include <i386/isa.h>
: > : >
: > : > or whatever in it, and we need to have an i386/isa.h that's just
: > : > #include <x86/isa.h>
: > : >
: > : > Warner
: > : >
: > : I'm guessing what was meant is that one benefit of a merged tree (like
: > : we will have with powerpc) is that you can do cc -m32 on a 64-bit host
: > : to get a 32-bit binary, which is less than trivial now.
: >
: > True enough. But we don't have anywhere close to a merged tree on
: > x86, and won't for the foreseeable future. I don't really want to see
: > an include32, when all the cross building tools exist in the tree
: > already (see XDEV in Makefile.inc1)... If you are cross building, you
: > really need a full cross building environment. The -m32 hacks we have
: > now are, as you describe, insufficient to the task...
:
: -m32 is not a hack, it is a standard feature on Linux and Solaris,
: allowing to build both 32 and 64 bit binaries in the host environment,
: not going to cross-compilation or chroot. It is very much missing on
: the FreeBSD.
:
: Merged x86 tree is ortoghonal to this feature.
I guess what I'm saying is that -m32, as it is implemented today, is a
hack. Mostly because it is missing all the pieces it needs to make it
work.
Warner
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