Date: Thu, 26 Jun 2008 23:19:15 +0200 From: Erik Trulsson <ertr1013@student.uu.se> To: Tim Daneliuk <tundra@tundraware.com> Cc: Kris Kennaway <kris@FreeBSD.org>, FreeBSD Mailing List <freebsd-questions@FreeBSD.org> Subject: Re: Making World For amd64 Message-ID: <20080626211915.GA65600@owl.midgard.homeip.net> In-Reply-To: <4864015C.7010805@tundraware.com> References: <4863F317.6010701@tundraware.com> <4863F4A7.1070909@FreeBSD.org> <4863F5A3.6050209@tundraware.com> <4863FC2A.5040909@FreeBSD.org> <4864015C.7010805@tundraware.com>
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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. 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. > > 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 (but I don't know how well it works in practice). Otherwise no. (Running a i386 binary on a sparc64 system won't work.) > > 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.) -- <Insert your favourite quote here.> Erik Trulsson ertr1013@student.uu.se
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