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63fb3721ef
Having just one depfile (.depend) means it has to be fully regenerated on every change, and it can't be done in parallel. After this change the rebuild time after touching a single test file has gone from 5.0 to 0.9 seconds. (make -j12) Build of tests from clean has gone from 8.1 to 5.5s. We could go even further and have one depfile per c-file, but this felt like a simple first step giving a nice improvement.