[PATCH] [DOCS] How to Add a Builder

[Reid Kleckner]

Starting from scratch seems undesirable.  ccache is basically just undoing
that for you.


On Wed, Nov 13, 2013 at 9:46 PM, Mikael Lyngvig <mikael at lyngvig.org> wrote:

> The problem is specific to the buildbot slaves that always start from
> scratch.  Otherwise, I agree with your views.
>
>
> -- Mikael
>
>
> 2013/11/14 Reid Kleckner <rnk at google.com>
>
>> IMO ccache is unnecessary if you use cmake+ninja.  They actually track
>> header dependencies well, so as long as you don't clean your build
>> directory, you'll have fast, correct incremental builds.  ccache won't save
>> much in that situation because the preprocessed source will actually be
>> different.
>>
>>
>> On Wed, Nov 13, 2013 at 9:12 PM, Mikael Lyngvig <mikael at lyngvig.org>wrote:
>>
>>> Hi,
>>>
>>> The patch basically tells that ccache is very usable for low-end Linux
>>> systems and briefly how to get going using ccache (one special option is
>>> needed, thanks to Dimitri Gribenko, for sharing this).
>>>
>>> On my ARMv7 a repeat clean build takes less than 1/3rd the time of the
>>> initial clean build.  So it is definitely something that the slow builders
>>> can benefit from.  A build time of 36 minutes was reduced to approximately
>>> 11.5 minutes.
>>>
>>> I suspect it might better be put in the GettingStarted document, but I
>>> need feedback on this.
>>>
>>> If anybody dislikes the idea of putting this patch in the LLVM
>>> documentation, then please think of the fact that LLVM benefits greatly
>>> from the builders doing their job as fast as at all possible.
>>>
>>>
>>> -- Mikael
>>>
>>>
>>> _______________________________________________
>>> llvm-commits mailing list
>>> llvm-commits at cs.uiuc.edu
>>> http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits
>>>
>>>
>>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-commits/attachments/20131113/a1a4ba99/attachment.html>