[llvm-dev] [RFC] One or many git repositories?

[Bruce Hoult via llvm-dev]

On Sat, Jul 30, 2016 at 2:26 AM, Robinson, Paul via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

>
> > Even then, are we seriously ignoring the fact that even if you did clone
> > the whole repository including everything, that you can still build just
> > the libc++ and sanitiser runtimes if you wanted to?
>
> Is it that easy to build a subset of a large checked-out tree?  I haven't
> tried it but my impression is: not so much.  Certainly the advertised
> tactics for configuring/building don't tell you how to do that.  Somebody
> figuring out what it takes would be very constructive here, instead of
> just asserting it can't possibly be that hard.
>

Right now, no. The build system assumes that if you checked someone out
then you want to build it.

This needs to change.

 I believe David Chisnall up-thread cited a difference in checkout times

> on the order of a handful of seconds versus a couple of minutes.  While
> naively it might seem not a big deal, over time and depending on what you
> are trying to do yes it can be a big burden
>

That's a one time cost, not every time you do an update.
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