The COMPILER_WARNINGS macro specifies the name of the file that contains warning information.
In the Windows Driver Kit (WDK), the default value is $(SDK_INC_PATH)\Warning.h.
If a different file is specified in this macro, the name of this file will be passed to the compiler with the /FI switch.
The file contains a list of compiler pragmas used to disable, enable, or promote warnings for the entire build.
Build date: 5/3/2011