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Since starting at a new company I’ve noticed that they use unity cpp files for the majority of our solution, and I was wondering if anyone is able to give me a definitive reason as to why and how these speed up the build process? I would’ve thought that editing one cpp file in the unity files will force recompilation of all of them.
Very similar question and good answers here: #include all .cpp files into a single compilation unit?
The summary seems to be that less I/O overhead is the major benefit.
See also The Magic Of Unity Builds as linked in the above question as well.