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.
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