4.6.7 Options for Controlling the Preprocessor

The options shown in the table below control the preprocessor and are discussed in the sections that follow.

Table 4-25. Preprocessor Options
Option (links to explanatory section)	Controls
`-Dmacro` `-Dmacro=text`	The definition of preprocessor macros.
`-dM`	Dump of macro definitions.
`-M`	Generation of dependencies.
`-mcmacros`	Predefine macros relevant for C programs.
`-MD`	Generation of dependencies.
`-MF`	Where dependency information is written.
`-MM`	Generation of dependencies.
`-MMD`	Generation of dependencies.
`-Umacro`	The undefinition of preprocessor macros.
`-Wp,option`	Options passed to the preprocessor.
`-Xpreprocessor option`	Options passed to the preprocessor.