/FD (IDE Minimal Rebuild)
/FD is only exposed to users in the Command Line property page of a C++ project's Property Pages dialog box. It's available if and only if the deprecated and off-by-default /Gm (Enable Minimal Rebuild) option isn't selected. /FD has no effect other than from the development environment. /FD isn't exposed in the output of
If you don't enable the deprecated /Gm option in the development environment, /FD is used. /FD ensures the .idb file has sufficient dependency information. /FD is only used by the development environment, and it shouldn't be used from the command line or a build script.