I'm using the evaluation version (11.1.048 on Win64) to try to compile my project (64bit target), which works fine on MacOS with and without IPO (-fast). On Windows however, the mcpcom.exe consumes all memory it can get (~8GB) and gets terminated by the OS with an OOM error. This happens even when using no options other than /Fo /c /D /I /TP. I'm linking against static libraries compiled with MSVC.
Unfortunately, i couldn't break it down to a simple test case, since this is a rather large project.