On Tue, Apr 12, 2016 at 3:27 PM, Martin Braun <[email protected]> wrote:
> It's my experience that ccache errs on the right side, i.e. it rather > recompiles if unsure. I've never had any caching issues with ccache. > Note that the cache quickly fills up, if I can spare the space I will up > the cache size from the default 1 GB. Right now it's at 8 GB but I doubt > that'll ever fill up. > My experience is the same. I've only ever had ccache erroneously decide something has changed and needs recompiling, not the other way around. It's been a long while since I've looked at its internals, but ISTR it does a hash on both the compiler command line options and the output from the preprocessor to match a cached output object file. -Johnathan
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