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2012-05-30ccache: Separate out into its own classRichard Purdie1
Currently, ccache is used if it is present. When building from scratch it gives no performance improvement and creates a ton of empty directories even when its not in use. This change moves ccache support to a bbclass file which the user can choose to enable. This should make builds more determinstic and make it easier/clearer to the end user when its being used and when it is not. Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>