[PATCH] [DOCS] How to Add a Builder

[Mikael Lyngvig]

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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