ccache pretty aggressively scans for things like __DATE__ and has direct understanding of compiler flags so instances of bad caching are pretty rare, I think I'

ccache pretty aggressively scans for things like __DATE__ and has direct understanding of compiler flags so instances of bad caching are pretty rare, I think I've only had it happen twice in years of use and once was a GCC bug. Also since ccache supports s3 out of the box now remote caching is pretty fast to setup. Remote compilation is not handled by ccache at all. You need distcc or icecc for that.