IDL_TYPE
When you specify an interface description language (IDL) file in your Sources rule, you have to specify whether this is an OLE IDL or an RPC IDL file, because their syntax differs. Based on the syntax, the Build utility passes different commands to the Microsoft IDL Compiler (MIDL).
In the Windows Driver Kit (WDK), the default value is IDL_TYPE=OLE.
Both of the following lines specify OLE:
IDL-TYPE=" "
IDL_TYPE=ole
The following line specifies RPC:
IDL_TYPE=rpc
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Build date: 5/3/2011