Date: Thu, 19 Jun 2008 08:22:37 -0700 From: "Garrett Cooper" <yanefbsd@gmail.com> To: "Alexander Sack" <pisymbol@gmail.com> Cc: freebsd-hackers@freebsd.org Subject: Re: Cross platform building best practices (building 6 on 7) Message-ID: <7d6fde3d0806190822s1420dcake3a38be7189b8ab0@mail.gmail.com> In-Reply-To: <3c0b01820806190629o7264cfaeg6fa6a08a6822047e@mail.gmail.com> References: <3c0b01820806190629o7264cfaeg6fa6a08a6822047e@mail.gmail.com>
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On Thu, Jun 19, 2008 at 6:29 AM, Alexander Sack <pisymbol@gmail.com> wrote: > Hello Folks: > > I've done a lot of Googling and scouring the lists about this > particular subject so I apologize for rehashing it. However, I'm > still confused on what's the best way to perform BSD cross platform > builds. Ideally what I want to have is an environment whereby I can > build a 6.1-RELEASE tree on a 7.0-RELEASE box. I thought originally I > could check out a 6.1 release version, perform make world, and then > use the output of that build as either a basis for a jail or a > toolchain. However, as noted by previous threads, 6.x doesn't build > on a 7.x due to gcc4/binutils compatibility issues (please correct me > if I'm wrong). I then thought I could potentially download a patched > binutils, copy it into src/contrib/binutils and that would potentially > fix it. No dice (and I'm still debugging why since this binutils > package DOES build outside of the make world infrastructure without > issue, this very well could be pilot error on my part since I didn't > update the VERSION string and didn't trim the source files as per the > FreeBSD-deleteList etc.). > > I THEN thought if I build/install a gcc-3.x/bintuils toolchain I could > complie a 6.x on a 7.x machine. Well I haven't done that yet since at > this point I believe I'm diverged from the path of FreeBSD build > enlightenment! Moreover, if would be NICE if I could bootstrap the > normal dev tools from the exiting make world build tree. I'm not yet > ready for a lot of hackery on the build tree without asking around. > :D! > > Does anyone due cross-platform builds (without host virtualization)? > > Thanks! > > -aps (I'll stick to just hackers@ because I don't want to pollute questions@ unnecessarily) You touched on an important point. There were some code quality issues (I think) with 6.x that were resolved moving to 7.x, which caused gcc-4.2.x to barf. gcc-4.2.x requires a newer version of binutils, just because (for API / usage compatibility). What you should probably do is create a jail then do your development for 6.x in a jail, 7.x in another, and (if you're bold enough ;)...) do 8.x development in yet a third. Jail's are a much better way to isolate things such that you don't have to worry about toolchain issues like these and are able to setup a sourcebase as the devs intended it (for the most part; you may run into issues with sysctls and virtual kernel stuff like that, but cest la vie... there isn't a better way I know of than that outside of running a VM). -Garrett
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