Using the __midl Predefined Constant
When the MIDL
compiler processes the input IDL and ACF files, __midl is defined by default
and is used for conditional compilation to attain consistency throughout the
build. This phases out the use of defines in the header files, such as
MIDL_PASS, and replaces them with a consistent flag.
If you
choose, you can override this default by specifying the following on the
command line:
-U__midl
See also
/U