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8.1.3 Preprocessor Options

Following command line options control the preprocessor feature. See MFL Preprocessor, for a detailed discussion of these.

--no-preprocessor

Do not run the preprocessor.

--preprocessor[=command]

If command is supplied, use it as the external preprocessor instead of the default. This overrides the preprocessor.command setting (see Preprocessor Configuration).

If used without arguments, forces the use of the configured preprocessor. This form is intended as a way to manually enable the use of the preprocessor if disabled in the configuration.

-D name[=value]

--define=name[=value]

Define a preprocessor symbol name to have a value value. This option is ignored if the preprocessor.pass-defines configuration setting is false.

-U name

--undefine=name

Undefine the preprocessor symbol name. This option is ignored if the preprocessor.pass-defines configuration setting is false.

-E

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.