General-Purpose Mail Filter
Following command line options control the preprocessor feature. See Preprocessor, for a detailed discussion of these.
Do not run the preprocessor.
Use command as the external preprocessor instead of the default
Define a preprocessor symbol name to have a value value.
Undefine the preprocessor symbol name.
Stop after the preprocessing stage; do not run the compiler proper. The output is in the form of preprocessed source code, which is sent to the standard output.
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