[OE-core] [PATCH] ccache: Disable CCACHE_HASHDIR by default

[Burton, Ross]

On 11 March 2017 at 16:54, Mike Crowe <mac at mcrowe.com> wrote:

> ccache apparently does this so that paths in the debug information will
> always be correct. In an OE world these paths may already be missing or
> incorrect due to rm_work or the use of a shared sstate cache, so it doesn't
> seem as if we're losing much by disabling this feature.
>

In an OE world we tell GCC to rewrite them to be target paths anyway, so
this isn't a problem.  Maybe worth rewriting the commit message?

(see bitbake.conf, -fdebug-prefix-map)

Ross
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