I don't see why people have such a problem with long source files to be completely honest. I'd rather do refactoring in one source file than edit 10 and wonder if I hit them all.
None of my other tools care about file length - it might actually take longer to build if the code were multiple files since most of the processing overhead will be in invoking the process and the context switching between the make tool and the compiler - modern C/C++ compilers can handle 10kloc files in their sleep.
In fact, in many projects that I've done with "correctly split" source files (one per class/object impl), I've seen that often the license and the general file boilerplate is actually longer than the code that goes in that file. It actually costs more for the compiler to handle this case, as it is doing even more useless I/O.
None of my other tools care about file length - it might actually take longer to build if the code were multiple files since most of the processing overhead will be in invoking the process and the context switching between the make tool and the compiler - modern C/C++ compilers can handle 10kloc files in their sleep.
In fact, in many projects that I've done with "correctly split" source files (one per class/object impl), I've seen that often the license and the general file boilerplate is actually longer than the code that goes in that file. It actually costs more for the compiler to handle this case, as it is doing even more useless I/O.