On Thu, Jun 26, 2008 at 11:19:15PM +0200, Erik Trulsson wrote: > On Thu, Jun 26, 2008 at 03:51:40PM -0500, Tim Daneliuk wrote: > > Kris Kennaway wrote: > > > Tim Daneliuk wrote: > > >> Kris Kennaway wrote: > > >>> Tim Daneliuk wrote: > > >>>> Is there anything special one has to do when doing a make world > > >>>> intended for 64-bit FreeBSD or is it sufficient to build the 64-bit > > >>>> kernel and make world as everywhere else? > > >>> The same as everywhere else. > > >>> > > >>> Kris > > >> > > >> So, I take it that this means that all the userspace programs, ports, > > >> packages, utilities, etc. do *not* take advantage of the 64-bit > > >> extensions. That is, only the kernel gets the benefit of the > > >> wider word. Is that correct? > > >> > > > > > > No, everything is 100% native. > > > > > > Kris > > > > > > > OK, these may be really stupid questions but: > > > > 1) How does make world know whether to build 32-bit or 64-bit binaries? > > It will build for whatever system you have installed.
The system Makefile calls 'uname -p' to get the system's processor architecture. > If you are running a 32-bit system it will make 32-bit binaries, and if > you are running a 64-bit system it will make 64-bit binaries. By default, amd64 also builds 32-bit libraries (/usr/lib32), unless you set WITHOUT_LIB32=true in /etc/src.conf. > > 2) Can a binary from a 32-bit FreeBSD system be run unmodified on the > > 64-bit system? > > Assuming the 32-bit system is 'i386' and the 64-bit system is 'amd64' then > you are supposed to be able to do so You will need a kernel (such as GENERIC) built with 'options COMPAT_IA32'. >(but I don't know how well it works in > practice). Otherwise no. (Running a i386 binary on a sparc64 system won't > work.) You will also need all the libraries that the application depends on in 32-bit versions. Either by copying them from a 32-bit system (built from the same source version) or by doing a cross-build. There was a thread some time ago (not sure if it was in -questions or -amd64) about using a 32-bit jail on amd64. That might be of interest. > > 3) If I reboot with 32-bit or 64-bit kernels, does the system magically > > somehow make the userland stuff work natively at the word width? > > If so, how? > > If you have installed the amd64 variant of FreeBSD (for example) then > all binaries (userland and kernel alike) will have been compiled for > the amd64 architecture (and thus 64-bit.) If you are running the i386 > variant then all binaries will have been compiled for i386 (and thus > 32-bit.) You can have both 32-bit and 64-bit systems on one machine, provided you put them on separate slices/partitions. Obviously you cannot have both a 32-bit and a 64-bit version of e.g. /bin/sh on one partition. Roland -- R.F.Smith http://www.xs4all.nl/~rsmith/ [plain text _non-HTML_ PGP/GnuPG encrypted/signed email much appreciated] pgp: 1A2B 477F 9970 BA3C 2914 B7CE 1277 EFB0 C321 A725 (KeyID: C321A725)
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