Example demonstrating that Visual Studio reverts to single-processor compilation if there are multiple source files with the same filename.

CMakeLists.txt generates two, almost identical executable targets: nonunique and unique. They consists of many files in numbered directories. In case of nonunique all files are named source.cpp whereas for unique they're numbered: source-##.cpp.

The /MP compiler flag is enabled for both targets. The unique executable builds much faster since the compilation mode is multi-processor while for unique is single-processor.