[coreboot] [PATCH]ccache aware romcc

[Patrick Georgi]

Am 25.03.2010 18:02, schrieb Patrick Georgi:
> Hi,
> 
> most of the tree was already ccache aware, with one exception: romcc.
> This hurt, as on the non-CAR boards, this is a large non-parallelizable
> part of the total build time.
> 
> This patch changes romcc to:
> - accept -c and -S (and ignores them as that's already the only mode it
> knows)
> - send -E output (preprocessor only) to stdout except if a filename is
> given (by testing if it's set to the current default of auto.inc)
> 
> With these, ccache3.0pre0 (the version I tried) is capable of cache
> romcc output.
> 
> The Makefile changes in this patch make use of that, if "ccache" is
> found in $PATH (necessary as we use various paths for our romcc), and
> runs ccache $(obj)/romcc, using the "content" compiler version
> verification (which hashes the compiler executable) for romcc.
> 
> Thus when romcc is changed, ccache doesn't use cached files but requests
> new builds.
> 
> On my test system, abuild of a romcc board (thomson/ip1000) goes down
> from 9 to 3 seconds when using 4 parallel build jobs.
> 
> 
> Signed-off-by: Patrick Georgi <patrick.georgi at coresystems.de>
> 
This time with patch
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