On Fri, 2011-09-09 at 14:22 -0500, Norbert Thiebaud wrote:
Now granted, once we can reliably do incremental build, the question
of the effectiveness of ccache will be much more acute.
presumable incremental build only try to compile stuff that _need_ to
be compiled and therefore should be a ccache miss... so with perfect
incremental build the ccache hit should be 0%
Not quite, I think. Consider a header file changed within
in #if-skipped region in a way which does not change the
number of skipped lines. I expect this would trigger a
recompile and that ccache, other things being equal, would
find a hit on the cache. Does this sound plausible.
Still, I would expect the hit rate to go really close to 0.
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