On 2010-12-31 19:06, Justin Lebar wrote: > I expect that approach B would speed up ccache direct mode hits > significantly, as most of the time, you'd only hash the source file, > and you'd use the cached hashes of the files it includes. If it runs > faster, presumably there would be less to gain by invoking ccache less > often. > > I'm very skeptical that we want to add to ccache the kind of > complexity (and tight coupling!) that option C requires. Furthermore, > it seems to me that some of this logic (e.g. "don't build me because, > although my mtime has changed, my contents haven't") belongs in the > build system. > > I'd also guess that C wouldn't be much faster than B, since in the > steady state, B hashes only the source file and has cached hashes of > most or all of the source file's includes.
I too think that option B sounds interesting, at least as an experiment to get a hint of the potential gain. -- Joel _______________________________________________ ccache mailing list firstname.lastname@example.org https://lists.samba.org/mailman/listinfo/ccache