The benefits / disadvantages of unity builds? [duplicate]
Solution 1:
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.
Solution 2:
Lee Winder posted his experiences with the Unity Builds - The Evils of Unity Builds
His conclusion is:
Unity builds. I don’t like them.