[llvm-dev] A Fresh Start with LLVM

Bruce Hoult via llvm-dev
2018-05-13T13:33:06Z

Yes, it's not bad. You can actually reduce the size of the .git directory
to 597 MB by running "git repack -a -d -f --depth=250 --window=250".
This
takes less than 5 minutes on a 16 core Xeon. Unfortunately I've never found
a way to get such a nicely packed repo into github such that it checks out
for others as nicely as it was when I uploaded it :-(


On Mon, May 14, 2018 at 12:18 AM, Martin J. O'Riordan via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Thanks Dean and Bruce.
>
> 1.1GB is a "lot" smaller than I expected, my worry was that it
might be
> >60GB with the entire change histories to v1.0.  Disk space is not a
> problem (at ~€80 per TB) just ISP download caps and 1.1GB is well under the
> radar :-)
>
> I will get Phabricator set up for collaboration.
>
> Thanks again for your help,
>
>         MartinO
>
> -----Original Message-----
> From: Dean Michael Berris [mailto:dean.berris at gmail.com]
> Sent: 13 May 2018 12:34
> To: Bruce Hoult <bruce at hoult.org>
> Cc: MartinO at theheart.ie; via llvm-dev <llvm-dev at lists.llvm.org>
> Subject: Re: [llvm-dev] A Fresh Start with LLVM
>
> On Sun, May 13, 2018 at 8:48 PM Bruce Hoult via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>
> > I recommend using
> > https://github.com/llvm-project/llvm-project-20170507
> if you can spare 1.1 GB of disk and bandwidth for the initial checkout and
> git repo itself.
>
> > It's just a few minutes behind the svn master copies. I don't
know of
> > a
> better monorepo at present.
>
> > Although everything is there, things such as clang and compiler-rt
> > aren't
> actually built unless you saymlink them into the appropriate place in the
> llvm directory.
>
> There's an updated process for getting this done, supported by the
CMake
> configurations.
>
> See
> https://llvm.org/docs/GettingStarted.html#for-
> developers-to-work-with-a-git-monorepo
> for details.
>
>
> > If you want to actually submit patches then you'll need to make
patch
> files and send them to the svn master.
>
>
> There's a way of doing this through the monorepo with the scripts that
are
> already in the llvm project. See the link above too for details.
>
> In particular, I encourage everyone to use the Phabricator installation
> and the pre-commit review process as well.
>
> I also encourage everyone to give the monorepo process a whirl, as it's
> been getting much better and easier for projects that need to make changes
> across the various repositories at once.
>
> Cheers
>
> > On Sun, May 13, 2018 at 10:37 PM, Martin J. O'Riordan via llvm-dev
<
> llvm-dev at lists.llvm.org> wrote:
>
> >> Hi LLVM Devs,
>
>
>
> >> I recently finished working for Intel/Movidius, and thought that
> >> before
> I start working on some new LLVM project, that this would be a good time
> to discard all of my old practices (which began with v2.7, and has gathered
> crud over the years) and restart with a brand new fresh LLVM approach
> directly from head.
>
>
>
> >> In preparation for doing this, I would like to know what is the
> >> current
> status of using GIT vs SVN and should I start afresh with the GIT
> repositories?  There is also the issue of Mono vs Multiple repositories,
> and which I select will be somewhat dictated by recommended best approach,
> and how big the Mono repository is to clone for the first time as I have
> ISP download caps to contend with.  I would prefer to have a Mono
> installation, and that way be able to track future development of all LLVM
> projects; but I also need to be able to enable and disable subprojects
> cleanly as I need them - for instance, at this time I am not yet ready for
> LLD and I don’t need DragonEgg, so although they are in the Mono
> repository, I need to be able to configure my build to exclude them.
>
>
>
> >> Mostly I expect that I will be working on cross-compilers for
> >> embedded
> systems, so cross-compilation of the libraries is important.  Historically
> I have done this with my own hand-crafted build systems (for LibC++ and
> Compiler-RT), but would like to do this with the integrated LLVM prescribed
> approach when possible.
>
>
>
> >> For testing I have never used the LLVM test-suite, nor the LIT and
> >> LNT
> frameworks, but in a fresh context I would like to get these up and
> running as soon as possible.  My primary development platform is Windows,
> with various Linux distros for verifying my development.  And if possible,
> I would like to construct a private BuildBot for each target I am working
> on that mirrors the LLVM community BuildBots - but this is also something I
> have never done.  To date, all of my testing for cross-development systems
> has used bespoke test harnesses and I would like to learn how to run the
> standard testing too; especially on Windows (8.1 and 10).
>
>
>
> >> Advice on getting set up with a fresh start would be greatly
> appreciated, as well as Newbie advice for how to test LLVM since in this
> regard I am a newbie.
>
>
>
> >> Thanks,
>
>
>
> >>              MartinO
>
>
>
>
> >> _______________________________________________
> >> LLVM Developers mailing list
> >> llvm-dev at lists.llvm.org
> >> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
>
> > _______________________________________________
> > LLVM Developers mailing list
> > llvm-dev at lists.llvm.org
> > http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
>
>
> --
> Dean
>
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