Command-Line Warning D9030
operation is incompatible with multiprocessing; ignoring /MP switch
A compiler option, which is referred to as an operation in this warning message, is incompatible with the /MP compiler option. Consequently, the compiler ignores the /MP option and continues the compilation.
Example
// D9030 expected
cl /Gm /MP a.cpp b.cpp c.cpp d.cpp
In this example, the /MP and /Gm (enable minimal rebuilds) compiler options are specified. Consequently, the compiler issues warning D9030, then ignores the /MP option.