[ccache] Caching failed compilations
ams at codesourcery.com
Wed Jul 1 03:16:14 MDT 2015
On 30/06/15 15:30, Akim Demaille wrote:
> Could ccache offer a mode where even failed compiled be ccached?
I'd like to see this too!
Or rather, I would have liked to see this on a project I worked on a
while ago. It's not really a common use case for most people, I'd
imagine, and not something I'd use now (my compile failures would be
almost entirely cache misses).
I did have a look at how feasible it is, and basically I think it can be
done. The caching is based on a hash of the input source files, combined
with the command line arguments and various other environmental factors;
in particular, the content of the output binaries is immaterial. The
warning messages that accompany the binary are already cached, so
caching error messages is not a big deal. It merely needs some sort of
mechanism to record the exit code.
I don't believe it would be possible to cache compilations where a
header file is missing, for example, but those fail very quickly anyway.
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