[PATCH] [DOCS] How to Add a Builder

Mikael Lyngvig mikael at lyngvig.org
Wed Nov 13 21:46:34 PST 2013

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
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